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boost-1.32
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0a6a213891 |
42
Jamfile
@@ -1,42 +0,0 @@
|
||||
subproject libs/python ;
|
||||
|
||||
# bring in the rules for python
|
||||
SEARCH on <module@>python.jam = $(BOOST_BUILD_PATH) ;
|
||||
include <module@>python.jam ;
|
||||
|
||||
local bpl-ldflags ;
|
||||
|
||||
if $(UNIX) && ( $(OS) = AIX )
|
||||
{
|
||||
bpl-linkflags = <linkflags>"-e initlibbpl" ;
|
||||
}
|
||||
|
||||
dll bpl
|
||||
:
|
||||
src/list.cpp
|
||||
src/long.cpp
|
||||
src/dict.cpp
|
||||
src/tuple.cpp
|
||||
src/str.cpp
|
||||
|
||||
src/aix_init_module.cpp
|
||||
src/converter/from_python.cpp
|
||||
src/converter/registry.cpp
|
||||
src/converter/type_id.cpp
|
||||
src/object/class.cpp
|
||||
src/object/function.cpp
|
||||
src/object/inheritance.cpp
|
||||
src/object/life_support.cpp
|
||||
src/object/pickle_support.cpp
|
||||
src/errors.cpp
|
||||
src/module.cpp
|
||||
src/converter/builtin_converters.cpp
|
||||
src/converter/arg_to_python_base.cpp
|
||||
src/object/iterator.cpp
|
||||
src/object_protocol.cpp
|
||||
src/object_operators.cpp
|
||||
:
|
||||
$(BOOST_PYTHON_V2_PROPERTIES)
|
||||
<define>BOOST_PYTHON_SOURCE
|
||||
$(bpl-linkflags)
|
||||
;
|
||||
BIN
build/Attic/python_v1.zip
Normal file
220
build/Jamfile
@@ -3,171 +3,93 @@
|
||||
# in all copies. This software is provided "as is" without express or implied
|
||||
# warranty, and with no claim as to its suitability for any purpose.
|
||||
#
|
||||
# Boost.Python build and test Jamfile
|
||||
#
|
||||
# To run all tests quietly: jam test
|
||||
# To run all tests with verbose output: jam -sPYTHON_TEST_ARGS=-v test
|
||||
#
|
||||
# Declares the following targets:
|
||||
# 1. libboost_python.dll/.so, a dynamic library to be linked with all
|
||||
# Boost.Python modules
|
||||
#
|
||||
# 2. pairs of test targets of the form <name>.test and <name>.run
|
||||
# <name>.test runs the test when it is out-of-date, and the "test"
|
||||
# pseudotarget depends on it. <name>.run runs
|
||||
# a test unconditionally, and can be used to force a test to run.. Each
|
||||
# test target builds one or more Boost.Python modules and runs a Python
|
||||
# script to test them. The test names are:
|
||||
#
|
||||
# from ../test
|
||||
#
|
||||
# comprehensive - a comprehensive test of Boost.Python features
|
||||
#
|
||||
# from ../example:
|
||||
# abstract -
|
||||
# getting_started1 -
|
||||
# getting_started2 -
|
||||
# simple_vector -
|
||||
# do_it_yourself_convts -
|
||||
# pickle1 -
|
||||
# pickle2 -
|
||||
# pickle3 -
|
||||
#
|
||||
# dvect1 -
|
||||
# dvect2 -
|
||||
# ivect1 -
|
||||
# ivect2 -
|
||||
# noncopyable -
|
||||
#
|
||||
# subproject-specific environment/command-line variables:
|
||||
#
|
||||
# PYTHON - How to invoke the Python interpreter. Defaults to "python"
|
||||
#
|
||||
# PYTHON_ROOT - Windows only: where Python is installed. Defaults to "c:/tools/python"
|
||||
#
|
||||
# PYTHON_VERSION - Version of Python. Defaults to "2.1" on Windows, "1.5" on Unix
|
||||
#
|
||||
# PYTHON_TEST_ARGS - specifies arguments to be passed to test scripts on
|
||||
# the command line. "-v" can be useful if you want to
|
||||
# see the output of successful tests.
|
||||
#
|
||||
# PYTHON_VECT_ITERATIONS - specifies the number of test iterations to use for
|
||||
# the dvect and ivect tests above.
|
||||
# Boost.Python library Jamfile
|
||||
|
||||
|
||||
# declare the location of this subproject relative to the root
|
||||
subproject libs/python/build ;
|
||||
|
||||
# bring in the rules for python
|
||||
SEARCH on <module@>python.jam = $(BOOST_BUILD_PATH) ;
|
||||
include <module@>python.jam ;
|
||||
import python ;
|
||||
|
||||
# This nasty hack works with versions of Python 1.5.2 -> 2.2 to avoid
|
||||
# building any Python stuff if there's no installation.
|
||||
SEARCH on <find-python-install>__init__.py = $(PYTHON_STDLIB_PATH)/test $(SUBDIR) ;
|
||||
include <find-python-install>__init__.py ;
|
||||
if ! $(gNO_PYTHON_INSTALL)
|
||||
if [ check-python-config ]
|
||||
{
|
||||
|
||||
local PYTHON_PROPERTIES = $(PYTHON_PROPERTIES) <define>BOOST_PYTHON_DYNAMIC_LIB ;
|
||||
local bpl-linkflags ;
|
||||
|
||||
#######################
|
||||
rule bpl-test ( test-name : sources + )
|
||||
{
|
||||
boost-python-test $(test-name) : $(sources) <dll>boost_python ;
|
||||
}
|
||||
if $(UNIX) && ( $(OS) = AIX )
|
||||
{
|
||||
bpl-linkflags = <linkflags>"-e initlibboost_python" ;
|
||||
}
|
||||
|
||||
#######################
|
||||
# Enabling intrinsics (/0i) or maximize speed (/02) seem to cause
|
||||
# internal compiler errors with this toolset.
|
||||
local msvc-stlport-workarounds
|
||||
= <optimization>off "<cxxflags>-Ogty -O1 -Gs" ;
|
||||
|
||||
local sources =
|
||||
numeric.cpp
|
||||
list.cpp
|
||||
long.cpp
|
||||
dict.cpp
|
||||
tuple.cpp
|
||||
str.cpp
|
||||
slice.cpp
|
||||
|
||||
#
|
||||
# Declare the boost python static link library
|
||||
#
|
||||
|
||||
# Base names of the source files for libboost_python
|
||||
local CPP_SOURCES =
|
||||
types classes conversions extension_class functions
|
||||
init_function module_builder objects cross_module errors
|
||||
;
|
||||
|
||||
lib boost_python_static : ../src/$(CPP_SOURCES).cpp
|
||||
# requirements
|
||||
: $(BOOST_PYTHON_INCLUDES)
|
||||
<shared-linkable>true
|
||||
<define>BOOST_PYTHON_STATIC_LIB=1
|
||||
[ difference $(PYTHON_PROPERTIES) : <define>BOOST_PYTHON_DYNAMIC_LIB ]
|
||||
: <suppress>true # don't build this unless the user asks for it by name
|
||||
aix_init_module.cpp
|
||||
converter/from_python.cpp
|
||||
converter/registry.cpp
|
||||
converter/type_id.cpp
|
||||
object/enum.cpp
|
||||
object/class.cpp
|
||||
object/function.cpp
|
||||
object/inheritance.cpp
|
||||
object/life_support.cpp
|
||||
object/pickle_support.cpp
|
||||
errors.cpp
|
||||
module.cpp
|
||||
converter/builtin_converters.cpp
|
||||
converter/arg_to_python_base.cpp
|
||||
object/iterator.cpp
|
||||
object_protocol.cpp
|
||||
object_operators.cpp
|
||||
wrapper.cpp
|
||||
;
|
||||
|
||||
dll boost_python
|
||||
: ../src/$(sources)
|
||||
: $(BOOST_PYTHON_V2_PROPERTIES)
|
||||
<define>BOOST_PYTHON_SOURCE
|
||||
$(bpl-linkflags)
|
||||
<msvc-stlport><release>$(msvc-stlport-workarounds)
|
||||
<darwin><*><linkflags>-bind_at_load
|
||||
;
|
||||
|
||||
dll boost_python
|
||||
# $(SUFDLL[1])
|
||||
: ../src/$(CPP_SOURCES).cpp
|
||||
# requirements
|
||||
: $(BOOST_PYTHON_INCLUDES)
|
||||
<shared-linkable>true
|
||||
<runtime-link>dynamic
|
||||
$(PYTHON_PROPERTIES)
|
||||
;
|
||||
template extension
|
||||
: <dll>boost_python
|
||||
: <sysinclude>../../..
|
||||
;
|
||||
|
||||
lib boost_python
|
||||
: # sources
|
||||
../src/$(sources)
|
||||
|
||||
: # requirements
|
||||
$(BOOST_PYTHON_V2_PROPERTIES)
|
||||
<define>BOOST_PYTHON_SOURCE
|
||||
<define>BOOST_STATIC_LIB
|
||||
$(bpl-linkflags)
|
||||
<msvc-stlport><release>$(msvc-stlport-workarounds)
|
||||
;
|
||||
|
||||
stage bin-stage : <dll>boost_python
|
||||
:
|
||||
<tag><debug>"_debug"
|
||||
<tag><debug-python>"_pydebug"
|
||||
stage bin-stage : <dll>boost_python <lib>boost_python
|
||||
: <tag><debug>"_debug"
|
||||
<tag><debug-python>"_pydebug"
|
||||
:
|
||||
debug release
|
||||
;
|
||||
|
||||
############# comprehensive module and test ###########
|
||||
bpl-test boost_python_test
|
||||
: ../test/comprehensive.cpp ;
|
||||
|
||||
boost-python-runtest comprehensive
|
||||
: ../test/comprehensive.py <pyd>boost_python_test <dll>boost_python ;
|
||||
|
||||
############# simple tests from ../example ############
|
||||
|
||||
rule boost-python-example-runtest ( name )
|
||||
{
|
||||
bpl-test $(name)
|
||||
: ../example/$(name).cpp ;
|
||||
|
||||
boost-python-runtest $(name)
|
||||
: ../example/test_$(name).py <pyd>$(name) <dll>boost_python ;
|
||||
install python lib
|
||||
: <dll>boost_python <lib>boost_python
|
||||
;
|
||||
}
|
||||
|
||||
|
||||
boost-python-example-runtest abstract ;
|
||||
boost-python-example-runtest getting_started1 ;
|
||||
boost-python-example-runtest getting_started2 ;
|
||||
boost-python-example-runtest simple_vector ;
|
||||
boost-python-example-runtest do_it_yourself_convts ;
|
||||
boost-python-example-runtest pickle1 ;
|
||||
boost-python-example-runtest pickle2 ;
|
||||
boost-python-example-runtest pickle3 ;
|
||||
|
||||
|
||||
bpl-test ivect : ../example/ivect.cpp ;
|
||||
bpl-test dvect : ../example/dvect.cpp ;
|
||||
bpl-test noncopyable_export : ../example/noncopyable_export.cpp ;
|
||||
bpl-test noncopyable_import : ../example/noncopyable_import.cpp ;
|
||||
|
||||
############## cross-module tests from ../example ##########
|
||||
|
||||
# A simple rule to build a test which depends on multiple modules in the PYTHONPATH
|
||||
rule boost-python-multi-example-runtest ( test-name : modules + )
|
||||
{
|
||||
boost-python-runtest $(test-name)
|
||||
: ../example/tst_$(test-name).py <pyd>$(modules) <dll>boost_python
|
||||
: : : $(PYTHON_VECT_ITERATIONS) ;
|
||||
}
|
||||
|
||||
PYTHON_VECT_ITERATIONS ?= 10 ;
|
||||
|
||||
boost-python-multi-example-runtest dvect1 : ivect dvect ;
|
||||
boost-python-multi-example-runtest dvect2 : ivect dvect ;
|
||||
|
||||
boost-python-multi-example-runtest ivect1 : ivect dvect ;
|
||||
boost-python-multi-example-runtest ivect2 : ivect dvect ;
|
||||
|
||||
boost-python-multi-example-runtest
|
||||
noncopyable : noncopyable_import noncopyable_export ;
|
||||
|
||||
}
|
||||
87
build/Jamfile.v2
Normal file
@@ -0,0 +1,87 @@
|
||||
import os ;
|
||||
import modules ;
|
||||
|
||||
# Use a very crude way to sense there python is locatted
|
||||
|
||||
|
||||
local PYTHON_PATH = [ modules.peek : PYTHON_PATH ] ;
|
||||
|
||||
if [ GLOB /usr/local/include/python2.2 : * ]
|
||||
{
|
||||
PYTHON_PATH = /usr/local ;
|
||||
}
|
||||
else if [ GLOB /usr/include/python2.2 : * ]
|
||||
{
|
||||
PYTHON_PATH = /usr ;
|
||||
}
|
||||
|
||||
if [ os.name ] in CYGWIN NT
|
||||
{
|
||||
lib_condition = <link>shared: ;
|
||||
defines = USE_DL_IMPORT ;
|
||||
|
||||
# Declare a target for the python interpreter library
|
||||
lib python : : <name>python22 <search>$(PYTHON_PATH)/libs ;
|
||||
PYTHON_LIB = python ;
|
||||
}
|
||||
else
|
||||
{
|
||||
lib python : : <name>python2.2 ;
|
||||
PYTHON_LIB = python ;
|
||||
}
|
||||
|
||||
|
||||
|
||||
if $(PYTHON_PATH) {
|
||||
|
||||
|
||||
project boost/python
|
||||
: source-location ../src
|
||||
: requirements <include>$(PYTHON_PATH)/include
|
||||
$(lib_condition)<library-path>$(PYTHON_PATH)/libs
|
||||
<link>shared:<library>$(PYTHON_LIB)
|
||||
<define>$(defines)
|
||||
: usage-requirements # requirement that will be propageted to *users* of this library
|
||||
<include>$(PYTHON_PATH)/include
|
||||
|
||||
# We have a bug which causes us to conclude that conditionalized
|
||||
# properties in this section are not free.
|
||||
# $(lib_condition)<library-path>$(PYTHON_PATH)/lib/python2.2/config
|
||||
# <shared>true:<find-library>$(PYTHON_LIB)
|
||||
|
||||
<library-path>$(PYTHON_PATH)/lib/python2.2/config
|
||||
<library>$(PYTHON_LIB)
|
||||
;
|
||||
|
||||
lib boost_python
|
||||
:
|
||||
numeric.cpp
|
||||
|
||||
list.cpp
|
||||
long.cpp
|
||||
dict.cpp
|
||||
tuple.cpp
|
||||
str.cpp
|
||||
|
||||
aix_init_module.cpp
|
||||
converter/from_python.cpp
|
||||
converter/registry.cpp
|
||||
converter/type_id.cpp
|
||||
object/enum.cpp
|
||||
object/class.cpp
|
||||
object/function.cpp
|
||||
object/inheritance.cpp
|
||||
object/life_support.cpp
|
||||
object/pickle_support.cpp
|
||||
errors.cpp
|
||||
module.cpp
|
||||
converter/builtin_converters.cpp
|
||||
converter/arg_to_python_base.cpp
|
||||
object/iterator.cpp
|
||||
object_protocol.cpp
|
||||
object_operators.cpp
|
||||
: <link>static:<define>BOOST_PYTHON_STATIC_LIB
|
||||
<define>BOOST_PYTHON_SOURCE
|
||||
: <link>shared
|
||||
;
|
||||
}
|
||||
882
build/VisualStudio/boost_python.dsp
Normal file
@@ -0,0 +1,882 @@
|
||||
# Microsoft Developer Studio Project File - Name="boost_python" - Package Owner=<4>
|
||||
# Microsoft Developer Studio Generated Build File, Format Version 6.00
|
||||
# ** DO NOT EDIT **
|
||||
|
||||
# TARGTYPE "Win32 (x86) Dynamic-Link Library" 0x0102
|
||||
|
||||
CFG=BOOST_PYTHON - WIN32 RELEASE
|
||||
!MESSAGE This is not a valid makefile. To build this project using NMAKE,
|
||||
!MESSAGE use the Export Makefile command and run
|
||||
!MESSAGE
|
||||
!MESSAGE NMAKE /f "boost_python.mak".
|
||||
!MESSAGE
|
||||
!MESSAGE You can specify a configuration when running NMAKE
|
||||
!MESSAGE by defining the macro CFG on the command line. For example:
|
||||
!MESSAGE
|
||||
!MESSAGE NMAKE /f "boost_python.mak" CFG="BOOST_PYTHON - WIN32 RELEASE"
|
||||
!MESSAGE
|
||||
!MESSAGE Possible choices for configuration are:
|
||||
!MESSAGE
|
||||
!MESSAGE "boost_python - Win32 Release" (based on "Win32 (x86) Dynamic-Link Library")
|
||||
!MESSAGE "boost_python - Win32 Debug" (based on "Win32 (x86) Dynamic-Link Library")
|
||||
!MESSAGE
|
||||
|
||||
# Begin Project
|
||||
# PROP AllowPerConfigDependencies 0
|
||||
# PROP Scc_ProjName ""
|
||||
# PROP Scc_LocalPath ""
|
||||
CPP=cl.exe
|
||||
MTL=midl.exe
|
||||
RSC=rc.exe
|
||||
|
||||
!IF "$(CFG)" == "boost_python - Win32 Release"
|
||||
|
||||
# PROP BASE Use_MFC 0
|
||||
# PROP BASE Use_Debug_Libraries 0
|
||||
# PROP BASE Output_Dir "Release"
|
||||
# PROP BASE Intermediate_Dir "Release"
|
||||
# PROP BASE Target_Dir ""
|
||||
# PROP Use_MFC 0
|
||||
# PROP Use_Debug_Libraries 0
|
||||
# PROP Output_Dir "../bin-stage"
|
||||
# PROP Intermediate_Dir "release-obj"
|
||||
# PROP Ignore_Export_Lib 0
|
||||
# PROP Target_Dir ""
|
||||
F90=df.exe
|
||||
# ADD BASE CPP /nologo /MT /W3 /GX /O2 /D "WIN32" /D "NDEBUG" /D "_WINDOWS" /D "_MBCS" /D "_USRDLL" /D "BPL_EXPORTS" /YX /FD /Zm800 /Zm800 /Zm800 /c
|
||||
# ADD CPP /nologo /MD /W3 /GR /GX /O2 /I "../../../../" /D "NDEBUG" /D "WIN32" /D "_WINDOWS" /D "_MBCS" /D "_USRDLL" /D "BOOST_PYTHON_DYNAMIC_LIB" /D "BOOST_PYTHON_SOURCE" /FD /Zm800 /Zm800 /Zm800 /Zm800 /c
|
||||
# SUBTRACT CPP /YX
|
||||
# ADD BASE MTL /nologo /D "NDEBUG" /mktyplib203 /win32
|
||||
# ADD MTL /nologo /D "NDEBUG" /mktyplib203 /win32
|
||||
# ADD BASE RSC /l 0x1409 /d "NDEBUG"
|
||||
# ADD RSC /l 0x1409 /d "NDEBUG"
|
||||
BSC32=bscmake.exe
|
||||
# ADD BASE BSC32 /nologo
|
||||
# ADD BSC32 /nologo
|
||||
LINK32=link.exe
|
||||
# ADD BASE LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /dll /machine:I386
|
||||
# ADD LINK32 kernel32.lib user32.lib /nologo /dll /machine:I386
|
||||
|
||||
!ELSEIF "$(CFG)" == "boost_python - Win32 Debug"
|
||||
|
||||
# PROP BASE Use_MFC 0
|
||||
# PROP BASE Use_Debug_Libraries 1
|
||||
# PROP BASE Output_Dir "Debug"
|
||||
# PROP BASE Intermediate_Dir "Debug"
|
||||
# PROP BASE Target_Dir ""
|
||||
# PROP Use_MFC 0
|
||||
# PROP Use_Debug_Libraries 1
|
||||
# PROP Output_Dir "../bin-stage"
|
||||
# PROP Intermediate_Dir "debug-obj"
|
||||
# PROP Ignore_Export_Lib 0
|
||||
# PROP Target_Dir ""
|
||||
F90=df.exe
|
||||
# ADD BASE CPP /nologo /MTd /W3 /Gm /GX /ZI /Od /D "WIN32" /D "_DEBUG" /D "_WINDOWS" /D "_MBCS" /D "_USRDLL" /D "BPL_EXPORTS" /YX /FD /Zm800 /Zm800 /Zm800 /GZ /c
|
||||
# ADD CPP /nologo /MDd /W3 /GR /GX /Zi /Od /I "../../../../" /D "_DEBUG" /D "WIN32" /D "_WINDOWS" /D "_MBCS" /D "_USRDLL" /D "BOOST_PYTHON_DYNAMIC_LIB" /D "BOOST_PYTHON_SOURCE" /FD /Zm800 /Zm800 /Zm800 /Zm800 /Zm800 /GZ /c
|
||||
# ADD BASE MTL /nologo /D "_DEBUG" /mktyplib203 /win32
|
||||
# ADD MTL /nologo /D "_DEBUG" /mktyplib203 /win32
|
||||
# ADD BASE RSC /l 0x1409 /d "_DEBUG"
|
||||
# ADD RSC /l 0x1409 /d "_DEBUG"
|
||||
BSC32=bscmake.exe
|
||||
# ADD BASE BSC32 /nologo
|
||||
# ADD BSC32 /nologo
|
||||
LINK32=link.exe
|
||||
# ADD BASE LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /dll /debug /machine:I386 /pdbtype:sept
|
||||
# ADD LINK32 kernel32.lib user32.lib /nologo /dll /incremental:no /debug /machine:I386 /out:"../bin-stage/boost_python_debug.dll" /pdbtype:sept
|
||||
|
||||
!ENDIF
|
||||
|
||||
# Begin Target
|
||||
|
||||
# Name "boost_python - Win32 Release"
|
||||
# Name "boost_python - Win32 Debug"
|
||||
# Begin Group "Source Files"
|
||||
|
||||
# PROP Default_Filter "cpp;c;cxx;rc;def;r;odl;idl;hpj;bat"
|
||||
# Begin Source File
|
||||
|
||||
SOURCE=..\..\src\aix_init_module.cpp
|
||||
# End Source File
|
||||
# Begin Source File
|
||||
|
||||
SOURCE=..\..\src\converter\arg_to_python_base.cpp
|
||||
# End Source File
|
||||
# Begin Source File
|
||||
|
||||
SOURCE=..\..\src\converter\builtin_converters.cpp
|
||||
# End Source File
|
||||
# Begin Source File
|
||||
|
||||
SOURCE=..\..\src\object\class.cpp
|
||||
# End Source File
|
||||
# Begin Source File
|
||||
|
||||
SOURCE=..\..\src\dict.cpp
|
||||
# End Source File
|
||||
# Begin Source File
|
||||
|
||||
SOURCE=..\..\src\object\enum.cpp
|
||||
# End Source File
|
||||
# Begin Source File
|
||||
|
||||
SOURCE=..\..\src\errors.cpp
|
||||
# End Source File
|
||||
# Begin Source File
|
||||
|
||||
SOURCE=..\..\src\converter\from_python.cpp
|
||||
# End Source File
|
||||
# Begin Source File
|
||||
|
||||
SOURCE=..\..\src\object\function.cpp
|
||||
# End Source File
|
||||
# Begin Source File
|
||||
|
||||
SOURCE=..\..\src\object\inheritance.cpp
|
||||
# End Source File
|
||||
# Begin Source File
|
||||
|
||||
SOURCE=..\..\src\object\iterator.cpp
|
||||
# End Source File
|
||||
# Begin Source File
|
||||
|
||||
SOURCE=..\..\src\object\life_support.cpp
|
||||
# End Source File
|
||||
# Begin Source File
|
||||
|
||||
SOURCE=..\..\src\list.cpp
|
||||
# End Source File
|
||||
# Begin Source File
|
||||
|
||||
SOURCE=..\..\src\long.cpp
|
||||
# End Source File
|
||||
# Begin Source File
|
||||
|
||||
SOURCE=..\..\src\module.cpp
|
||||
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|
||||
|
||||
SOURCE=..\..\..\..\boost\python\module.hpp
|
||||
# End Source File
|
||||
# Begin Source File
|
||||
|
||||
SOURCE=..\..\..\..\boost\python\module_init.hpp
|
||||
# End Source File
|
||||
# Begin Source File
|
||||
|
||||
SOURCE=..\..\..\..\boost\python\numeric.hpp
|
||||
# End Source File
|
||||
# Begin Source File
|
||||
|
||||
SOURCE=..\..\..\..\boost\python\object.hpp
|
||||
# End Source File
|
||||
# Begin Source File
|
||||
|
||||
SOURCE=..\..\..\..\boost\python\object_attributes.hpp
|
||||
# End Source File
|
||||
# Begin Source File
|
||||
|
||||
SOURCE=..\..\..\..\boost\python\object_call.hpp
|
||||
# End Source File
|
||||
# Begin Source File
|
||||
|
||||
SOURCE=..\..\..\..\boost\python\object_core.hpp
|
||||
# End Source File
|
||||
# Begin Source File
|
||||
|
||||
SOURCE=..\..\..\..\boost\python\object_fwd.hpp
|
||||
# End Source File
|
||||
# Begin Source File
|
||||
|
||||
SOURCE=..\..\..\..\boost\python\object_items.hpp
|
||||
# End Source File
|
||||
# Begin Source File
|
||||
|
||||
SOURCE=..\..\..\..\boost\python\object_operators.hpp
|
||||
# End Source File
|
||||
# Begin Source File
|
||||
|
||||
SOURCE=..\..\..\..\boost\python\object_protocol.hpp
|
||||
# End Source File
|
||||
# Begin Source File
|
||||
|
||||
SOURCE=..\..\..\..\boost\python\object_protocol_core.hpp
|
||||
# End Source File
|
||||
# Begin Source File
|
||||
|
||||
SOURCE=..\..\..\..\boost\python\object_slices.hpp
|
||||
# End Source File
|
||||
# Begin Source File
|
||||
|
||||
SOURCE=..\..\..\..\boost\python\operators.hpp
|
||||
# End Source File
|
||||
# Begin Source File
|
||||
|
||||
SOURCE=..\..\..\..\boost\python\operators2.hpp
|
||||
# End Source File
|
||||
# Begin Source File
|
||||
|
||||
SOURCE=..\..\..\..\boost\python\other.hpp
|
||||
# End Source File
|
||||
# Begin Source File
|
||||
|
||||
SOURCE=..\..\..\..\boost\python\overloads.hpp
|
||||
# End Source File
|
||||
# Begin Source File
|
||||
|
||||
SOURCE=..\..\..\..\boost\python\pointee.hpp
|
||||
# End Source File
|
||||
# Begin Source File
|
||||
|
||||
SOURCE=..\..\..\..\boost\python\proxy.hpp
|
||||
# End Source File
|
||||
# Begin Source File
|
||||
|
||||
SOURCE=..\..\..\..\boost\python\ptr.hpp
|
||||
# End Source File
|
||||
# Begin Source File
|
||||
|
||||
SOURCE=..\..\..\..\boost\python\refcount.hpp
|
||||
# End Source File
|
||||
# Begin Source File
|
||||
|
||||
SOURCE=..\..\..\..\boost\python\reference_existing_object.hpp
|
||||
# End Source File
|
||||
# Begin Source File
|
||||
|
||||
SOURCE=..\..\..\..\boost\python\return_internal_reference.hpp
|
||||
# End Source File
|
||||
# Begin Source File
|
||||
|
||||
SOURCE=..\..\..\..\boost\python\return_value_policy.hpp
|
||||
# End Source File
|
||||
# Begin Source File
|
||||
|
||||
SOURCE=..\..\..\..\boost\python\scope.hpp
|
||||
# End Source File
|
||||
# Begin Source File
|
||||
|
||||
SOURCE=..\..\..\..\boost\python\self.hpp
|
||||
# End Source File
|
||||
# Begin Source File
|
||||
|
||||
SOURCE=..\..\..\..\boost\python\signature.hpp
|
||||
# End Source File
|
||||
# Begin Source File
|
||||
|
||||
SOURCE=..\..\..\..\boost\python\slice_nil.hpp
|
||||
# End Source File
|
||||
# Begin Source File
|
||||
|
||||
SOURCE=..\..\..\..\boost\python\str.hpp
|
||||
# End Source File
|
||||
# Begin Source File
|
||||
|
||||
SOURCE=..\..\..\..\boost\python\tag.hpp
|
||||
# End Source File
|
||||
# Begin Source File
|
||||
|
||||
SOURCE=..\..\..\..\boost\python\to_python_converter.hpp
|
||||
# End Source File
|
||||
# Begin Source File
|
||||
|
||||
SOURCE=..\..\..\..\boost\python\to_python_indirect.hpp
|
||||
# End Source File
|
||||
# Begin Source File
|
||||
|
||||
SOURCE=..\..\..\..\boost\python\to_python_value.hpp
|
||||
# End Source File
|
||||
# Begin Source File
|
||||
|
||||
SOURCE=..\..\..\..\boost\python\tuple.hpp
|
||||
# End Source File
|
||||
# Begin Source File
|
||||
|
||||
SOURCE=..\..\..\..\boost\python\type_id.hpp
|
||||
# End Source File
|
||||
# Begin Source File
|
||||
|
||||
SOURCE=..\..\..\..\boost\python\with_custodian_and_ward.hpp
|
||||
# End Source File
|
||||
# End Group
|
||||
# Begin Group "Resource Files"
|
||||
|
||||
# PROP Default_Filter "ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe"
|
||||
# End Group
|
||||
# End Target
|
||||
# End Project
|
||||
29
build/VisualStudio/boost_python.dsw
Normal file
@@ -0,0 +1,29 @@
|
||||
Microsoft Developer Studio Workspace File, Format Version 6.00
|
||||
# WARNING: DO NOT EDIT OR DELETE THIS WORKSPACE FILE!
|
||||
|
||||
###############################################################################
|
||||
|
||||
Project: "boost_python"=".\boost_python.dsp" - Package Owner=<4>
|
||||
|
||||
Package=<5>
|
||||
{{{
|
||||
}}}
|
||||
|
||||
Package=<4>
|
||||
{{{
|
||||
}}}
|
||||
|
||||
###############################################################################
|
||||
|
||||
Global:
|
||||
|
||||
Package=<5>
|
||||
{{{
|
||||
}}}
|
||||
|
||||
Package=<3>
|
||||
{{{
|
||||
}}}
|
||||
|
||||
###############################################################################
|
||||
|
||||
@@ -1,22 +0,0 @@
|
||||
# Dummy file actually to be included by Jam when the python headers
|
||||
# can't be found
|
||||
|
||||
if ! $(gNO_PYTHON_INSTALL)
|
||||
{
|
||||
ECHO "---------------------------------------------------------------------" ;
|
||||
ECHO skipping Boost.Python library build ;
|
||||
ECHO You can configure the location of your python installation, by setting: ;
|
||||
ECHO "PYTHON_ROOT - currently" \"$(PYTHON_ROOT:J=" ")\" ;
|
||||
ECHO "PYTHON_VERSION - The 2-part python Major.Minor version number (e.g." ;
|
||||
ECHO " \"2.2\", NOT \"2.2.1\") - currently" \"$(PYTHON_VERSION)\" ;
|
||||
ECHO ;
|
||||
ECHO "The following are automatically configured from PYTHON_ROOT if not" ;
|
||||
ECHO "otherwise set:" ;
|
||||
ECHO " PYTHON_INCLUDES - path to Python #include directories; currently" \"$(PYTHON_INCLUDES:J=" ")\" ;
|
||||
ECHO " PYTHON_LIB_PATH - path to Python library; currently" ;
|
||||
ECHO " " \"$(PYTHON_LIB_PATH:J=" ")\" ;
|
||||
ECHO " PYTHON_STDLIB_PATH - path to Python standard library modules; currently" ;
|
||||
ECHO " " \"$(PYTHON_STDLIB_PATH:J=" ")\" ;
|
||||
ECHO "---------------------------------------------------------------------" ;
|
||||
}
|
||||
gNO_PYTHON_INSTALL ?= true ;
|
||||
@@ -1,59 +0,0 @@
|
||||
# Revision History:
|
||||
# 17 Apr 01 include cross-module support, compile getting_started1 (R.W. Grosse-Kunstleve) UNTESTED!
|
||||
# 06 Mar 01 Fixed typo in use of "PYTHON_LIB" (Dave Abrahams)
|
||||
# 04 Mar 01 Changed library name to libboost_python.a (David Abrahams)
|
||||
|
||||
LIBSRC = \
|
||||
classes.cpp \
|
||||
conversions.cpp \
|
||||
cross_module.cpp \
|
||||
errors.cpp \
|
||||
extension_class.cpp \
|
||||
functions.cpp \
|
||||
init_function.cpp \
|
||||
module_builder.cpp \
|
||||
objects.cpp \
|
||||
types.cpp
|
||||
|
||||
LIBOBJ = $(LIBSRC:.cpp=.o)
|
||||
OBJ = $(LIBOBJ)
|
||||
|
||||
|
||||
ifeq "$(OS)" "Windows_NT"
|
||||
PYTHON_LIB=c:/tools/python/libs/python15.lib
|
||||
INC = -Ic:/cygnus/usr/include/g++-3 -Ic:/cygnus/usr/include -Ic:/boost -Ic:/tools/python/include
|
||||
MODULE_EXTENSION=dll
|
||||
else
|
||||
INC = -I/usr/local/include/python1.5
|
||||
MODULE_EXTENSION=so
|
||||
endif
|
||||
|
||||
%.o: ../src/%.cpp
|
||||
como --pic $(INC) -o $*.o -c $<
|
||||
|
||||
%.d: ../src/%.cpp
|
||||
@echo creating $@
|
||||
@set -e; como -M $(INC) -c $< \
|
||||
| sed 's/\($*\)\.o[ :]*/\1.o $@ : /g' > $@; \
|
||||
[ -s $@ ] || rm -f $@
|
||||
|
||||
getting_started1: getting_started1.o libboost_python.a
|
||||
como-dyn-link -o ../example/getting_started1.$(MODULE_EXTENSION) $(PYTHON_LIB) getting_started1.o -L. -lboost_python
|
||||
ln -s ../test/doctest.py ../example
|
||||
python ../example/test_getting_started1.py
|
||||
|
||||
getting_started1.o: ../example/getting_started1.cpp
|
||||
como --pic $(INC) -o $*.o -c $<
|
||||
|
||||
clean:
|
||||
rm -rf *.o *.$(MODULE_EXTENSION) *.a *.d *.pyc *.bak a.out
|
||||
|
||||
libboost_python.a: $(LIBOBJ)
|
||||
rm -f libboost_python.a
|
||||
ar cq libboost_python.a $(LIBOBJ)
|
||||
|
||||
DEP = $(OBJ:.o=.d)
|
||||
|
||||
ifneq "$(MAKECMDGOALS)" "clean"
|
||||
include $(DEP)
|
||||
endif
|
||||
146
build/filemgr.py
@@ -1,146 +0,0 @@
|
||||
# Revision history:
|
||||
# 12 Apr 01 use os.path, shutil
|
||||
# Initial version: R.W. Grosse-Kunstleve
|
||||
|
||||
bpl_src = "/libs/python/src"
|
||||
bpl_tst = "/libs/python/test"
|
||||
bpl_exa = "/libs/python/example"
|
||||
files = (
|
||||
bpl_src + "/classes.cpp",
|
||||
bpl_src + "/conversions.cpp",
|
||||
bpl_src + "/errors.cpp",
|
||||
bpl_src + "/extension_class.cpp",
|
||||
bpl_src + "/functions.cpp",
|
||||
bpl_src + "/init_function.cpp",
|
||||
bpl_src + "/module_builder.cpp",
|
||||
bpl_src + "/objects.cpp",
|
||||
bpl_src + "/types.cpp",
|
||||
bpl_src + "/cross_module.cpp",
|
||||
bpl_tst + "/comprehensive.cpp",
|
||||
bpl_tst + "/comprehensive.hpp",
|
||||
bpl_tst + "/comprehensive.py",
|
||||
bpl_tst + "/doctest.py",
|
||||
bpl_exa + "/abstract.cpp",
|
||||
bpl_exa + "/getting_started1.cpp",
|
||||
bpl_exa + "/getting_started2.cpp",
|
||||
bpl_exa + "/simple_vector.cpp",
|
||||
bpl_exa + "/do_it_yourself_convts.cpp",
|
||||
bpl_exa + "/nested.cpp",
|
||||
bpl_exa + "/pickle1.cpp",
|
||||
bpl_exa + "/pickle2.cpp",
|
||||
bpl_exa + "/pickle3.cpp",
|
||||
bpl_exa + "/test_abstract.py",
|
||||
bpl_exa + "/test_getting_started1.py",
|
||||
bpl_exa + "/test_getting_started2.py",
|
||||
bpl_exa + "/test_simple_vector.py",
|
||||
bpl_exa + "/test_do_it_yourself_convts.py",
|
||||
bpl_exa + "/test_nested.py",
|
||||
bpl_exa + "/test_pickle1.py",
|
||||
bpl_exa + "/test_pickle2.py",
|
||||
bpl_exa + "/test_pickle3.py",
|
||||
bpl_exa + "/noncopyable.h",
|
||||
bpl_exa + "/noncopyable_export.cpp",
|
||||
bpl_exa + "/noncopyable_import.cpp",
|
||||
bpl_exa + "/dvect.h",
|
||||
bpl_exa + "/dvect.cpp",
|
||||
bpl_exa + "/dvect_conversions.cpp",
|
||||
bpl_exa + "/dvect_defs.cpp",
|
||||
bpl_exa + "/ivect.h",
|
||||
bpl_exa + "/ivect.cpp",
|
||||
bpl_exa + "/ivect_conversions.cpp",
|
||||
bpl_exa + "/ivect_defs.cpp",
|
||||
bpl_exa + "/tst_noncopyable.py",
|
||||
bpl_exa + "/tst_dvect1.py",
|
||||
bpl_exa + "/tst_dvect2.py",
|
||||
bpl_exa + "/tst_ivect1.py",
|
||||
bpl_exa + "/tst_ivect2.py",
|
||||
bpl_exa + "/test_cross_module.py",
|
||||
bpl_exa + "/vector_wrapper.h",
|
||||
bpl_exa + "/richcmp1.cpp",
|
||||
bpl_exa + "/richcmp2.cpp",
|
||||
bpl_exa + "/richcmp3.cpp",
|
||||
bpl_exa + "/test_richcmp1.py",
|
||||
bpl_exa + "/test_richcmp2.py",
|
||||
bpl_exa + "/test_richcmp3.py",
|
||||
)
|
||||
|
||||
defs = (
|
||||
"boost_python_test",
|
||||
"abstract",
|
||||
"getting_started1",
|
||||
"getting_started2",
|
||||
"simple_vector",
|
||||
"do_it_yourself_convts",
|
||||
"nested",
|
||||
"pickle1",
|
||||
"pickle2",
|
||||
"pickle3",
|
||||
"noncopyable_export",
|
||||
"noncopyable_import",
|
||||
"ivect",
|
||||
"dvect",
|
||||
"richcmp1",
|
||||
"richcmp2",
|
||||
"richcmp3",
|
||||
)
|
||||
|
||||
if (__name__ == "__main__"):
|
||||
|
||||
import sys, os, shutil
|
||||
|
||||
path = sys.argv[1]
|
||||
mode = sys.argv[2]
|
||||
if (not mode in ("softlinks", "unlink", "cp", "rm", "copy", "del")):
|
||||
raise RuntimeError, \
|
||||
"usage: python filemgr.py path <softlinks|unlink|cp|rm|copy|del>"
|
||||
|
||||
if (mode in ("cp", "copy")):
|
||||
for fn in files:
|
||||
f = os.path.basename(fn)
|
||||
print "Copying: " + f
|
||||
shutil.copy(path + fn, ".")
|
||||
|
||||
elif (mode == "softlinks"):
|
||||
for fn in files:
|
||||
f = os.path.basename(fn)
|
||||
if (os.path.exists(f)):
|
||||
print "File exists: " + f
|
||||
else:
|
||||
print "Linking: " + f
|
||||
os.symlink(path + fn, f)
|
||||
|
||||
elif (mode in ("rm", "del")):
|
||||
for fn in files:
|
||||
f = os.path.basename(fn)
|
||||
if (os.path.exists(f)):
|
||||
print "Removing: " + f
|
||||
try: os.unlink(f)
|
||||
except: pass
|
||||
|
||||
elif (mode == "unlink"):
|
||||
for fn in files:
|
||||
f = os.path.basename(fn)
|
||||
if (os.path.exists(f)):
|
||||
if (os.path.islink(f)):
|
||||
print "Unlinking: " + f
|
||||
try: os.unlink(f)
|
||||
except: pass
|
||||
else:
|
||||
print "Not a softlink: " + f
|
||||
|
||||
if (mode in ("softlinks", "cp", "copy")):
|
||||
for d in defs:
|
||||
fn = d + ".def"
|
||||
print "Creating: " + fn
|
||||
f = open(fn, "w")
|
||||
f.write("EXPORTS\n")
|
||||
f.write("\tinit" + d + "\n")
|
||||
f.close()
|
||||
|
||||
if (mode in ("unlink", "rm", "del")):
|
||||
for d in defs:
|
||||
fn = d + ".def"
|
||||
if (os.path.exists(fn)):
|
||||
print "Removing: " + fn
|
||||
try: os.unlink(fn)
|
||||
except: pass
|
||||
@@ -1,88 +0,0 @@
|
||||
# Revision History
|
||||
|
||||
# 17 Apr 01 include cross-module support, compile getting_started1 (R.W. Grosse-Kunstleve)
|
||||
# 17 Apr 01 build shared library (patch provided by Dan Nuffer)
|
||||
# 04 Mar 01 Changed library name to libboost_python.a, various cleanups,
|
||||
# attempted Cygwin compatibility. Still needs testing on Linux
|
||||
# (David Abrahams)
|
||||
|
||||
|
||||
LIBSRC = \
|
||||
classes.cpp \
|
||||
conversions.cpp \
|
||||
cross_module.cpp \
|
||||
errors.cpp \
|
||||
extension_class.cpp \
|
||||
functions.cpp \
|
||||
init_function.cpp \
|
||||
module_builder.cpp \
|
||||
objects.cpp \
|
||||
types.cpp
|
||||
|
||||
LIBOBJ = $(LIBSRC:.cpp=.o)
|
||||
OBJ = $(LIBOBJ)
|
||||
|
||||
LIBNAME = libboost_python
|
||||
# libpython2.0.dll
|
||||
|
||||
ifeq "$(OS)" "Windows_NT"
|
||||
ROOT=c:/cygnus
|
||||
INC = -Ic:/cygnus/usr/include/g++-3 -Ic:/cygnus/usr/include -Ic:/boost -I$(PYTHON_INC)
|
||||
MODULE_EXTENSION=dll
|
||||
PYTHON_LIB=c:/cygnus/usr/local/lib/python2.0/config/libpython2.0.dll.a
|
||||
SHARED_LIB = $(LIBNAME).dll
|
||||
else
|
||||
PYTHON_INC=$(ROOT)/usr/local/Python-2.0/include/python2.0
|
||||
BOOST_INC=../../..
|
||||
INC = -I$(BOOST_INC) -I$(PYTHON_INC)
|
||||
MODULE_EXTENSION=so
|
||||
VERSION=1
|
||||
SHARED_LIB = $(LIBNAME).so.$(VERSION)
|
||||
endif
|
||||
|
||||
%.o: ../src/%.cpp
|
||||
g++ -fPIC -Wall -W $(INC) $(CXXFLAGS) -o $*.o -c $<
|
||||
|
||||
%.d: ../src/%.cpp
|
||||
@echo creating $@
|
||||
@set -e; g++ -M $(INC) -c $< \
|
||||
| sed 's/\($*\)\.o[ :]*/\1.o $@ : /g' > $@; \
|
||||
[ -s $@ ] || rm -f $@
|
||||
|
||||
|
||||
PYTHON = python
|
||||
|
||||
all: test $(SHARED_LIB) getting_started1
|
||||
|
||||
test: comprehensive.o $(LIBNAME).a $(SHARED_LIB)
|
||||
g++ $(CXXFLAGS) -shared -o ../test/boost_python_test.$(MODULE_EXTENSION) comprehensive.o -L. -lboost_python $(PYTHON_LIB)
|
||||
$(PYTHON) ../test/comprehensive.py
|
||||
|
||||
comprehensive.o: ../test/comprehensive.cpp
|
||||
g++ $(CXXFLAGS) --template-depth-32 -fPIC -Wall -W $(INC) -o $*.o -c $<
|
||||
|
||||
|
||||
getting_started1: getting_started1.o $(LIBNAME).a
|
||||
g++ $(CXXFLAGS) -shared -o ../example/getting_started1.$(MODULE_EXTENSION) getting_started1.o -L. -lboost_python $(PYTHON_LIB)
|
||||
ln -s ../test/doctest.py ../example
|
||||
$(PYTHON) ../example/test_getting_started1.py
|
||||
|
||||
getting_started1.o: ../example/getting_started1.cpp
|
||||
g++ $(CXXFLAGS) --template-depth-32 -fPIC -Wall -W $(INC) -o $*.o -c $<
|
||||
|
||||
|
||||
clean:
|
||||
rm -rf *.o *.$(MODULE_EXTENSION) *.a *.d *.pyc *.bak a.out
|
||||
|
||||
$(LIBNAME).a: $(LIBOBJ)
|
||||
rm -f $@
|
||||
ar cqs $@ $(LIBOBJ)
|
||||
|
||||
$(SHARED_LIB): $(LIBOBJ)
|
||||
g++ $(CXXFLAGS) -shared -o $@ -Wl,--soname=$(LIBNAME).$(MODULE_EXTENSION)
|
||||
|
||||
DEP = $(OBJ:.o=.d)
|
||||
|
||||
ifneq "$(MAKECMDGOALS)" "clean"
|
||||
include $(DEP)
|
||||
endif
|
||||
@@ -1,184 +0,0 @@
|
||||
# Usage:
|
||||
#
|
||||
# Create a new empty directory anywhere (preferably not in the boost tree).
|
||||
# Copy this Makefile to that new directory and rename it to "Makefile"
|
||||
# Adjust the pathnames below.
|
||||
#
|
||||
# make softlinks Create softlinks to source code and tests
|
||||
# make Compile all sources
|
||||
# make test Run doctest tests
|
||||
# make clean Remove all object files
|
||||
# make unlink Remove softlinks
|
||||
#
|
||||
# Revision history:
|
||||
# 12 Apr 01 new macro ROOT to simplify configuration (R.W. Grosse-Kunstleve)
|
||||
# Initial version: R.W. Grosse-Kunstleve
|
||||
|
||||
ROOT=$(HOME)
|
||||
BOOST=$(ROOT)/boost
|
||||
|
||||
#PYEXE=PYTHONPATH=. /usr/local/Python-1.5.2/bin/python
|
||||
#PYINC=-I/usr/local/Python-1.5.2/include/python1.5
|
||||
PYEXE=PYTHONPATH=. /usr/local_cci/Python-2.1.1/bin/python
|
||||
PYINC=-I/usr/local_cci/Python-2.1.1/include/python2.1
|
||||
STLPORTINC=-I$(BOOST)/boost/compatibility/cpp_c_headers
|
||||
|
||||
STDOPTS=
|
||||
WARNOPTS=-woff 1001,1234,1682
|
||||
OPTOPTS=-g
|
||||
|
||||
CPP=CC -LANG:std -n32 -mips4
|
||||
CPPOPTS=$(STLPORTINC) $(STLPORTOPTS) -I$(BOOST) $(PYINC) \
|
||||
$(STDOPTS) $(WARNOPTS) $(OPTOPTS)
|
||||
MAKEDEP=-M
|
||||
|
||||
LD=CC -LANG:std -n32 -mips4
|
||||
LDOPTS=-shared
|
||||
|
||||
OBJ=classes.o conversions.o errors.o extension_class.o functions.o \
|
||||
init_function.o module_builder.o \
|
||||
objects.o types.o cross_module.o
|
||||
DEPOBJ=$(OBJ) \
|
||||
comprehensive.o \
|
||||
abstract.o \
|
||||
getting_started1.o getting_started2.o \
|
||||
simple_vector.o \
|
||||
do_it_yourself_convts.o \
|
||||
nested.o \
|
||||
pickle1.o pickle2.o pickle3.o \
|
||||
noncopyable_export.o noncopyable_import.o \
|
||||
ivect.o dvect.o \
|
||||
richcmp1.o richcmp2.o richcmp3.o
|
||||
|
||||
.SUFFIXES: .o .cpp
|
||||
|
||||
all: libboost_python.a \
|
||||
boost_python_test.so \
|
||||
abstract.so \
|
||||
getting_started1.so getting_started2.so \
|
||||
simple_vector.so \
|
||||
do_it_yourself_convts.so \
|
||||
nested.so \
|
||||
pickle1.so pickle2.so pickle3.so \
|
||||
noncopyable_export.so noncopyable_import.so \
|
||||
ivect.so dvect.so \
|
||||
richcmp1.so richcmp2.so richcmp3.so
|
||||
|
||||
libboost_python.a: $(OBJ)
|
||||
rm -f libboost_python.a
|
||||
$(CPP) -ar -o libboost_python.a $(OBJ)
|
||||
|
||||
boost_python_test.so: $(OBJ) comprehensive.o
|
||||
$(LD) $(LDOPTS) $(OBJ) comprehensive.o -o boost_python_test.so -lm
|
||||
|
||||
abstract.so: $(OBJ) abstract.o
|
||||
$(LD) $(LDOPTS) $(OBJ) abstract.o -o abstract.so
|
||||
|
||||
getting_started1.so: $(OBJ) getting_started1.o
|
||||
$(LD) $(LDOPTS) $(OBJ) getting_started1.o -o getting_started1.so
|
||||
|
||||
getting_started2.so: $(OBJ) getting_started2.o
|
||||
$(LD) $(LDOPTS) $(OBJ) getting_started2.o -o getting_started2.so
|
||||
|
||||
simple_vector.so: $(OBJ) simple_vector.o
|
||||
$(LD) $(LDOPTS) $(OBJ) simple_vector.o -o simple_vector.so
|
||||
|
||||
do_it_yourself_convts.so: $(OBJ) do_it_yourself_convts.o
|
||||
$(LD) $(LDOPTS) $(OBJ) do_it_yourself_convts.o -o do_it_yourself_convts.so
|
||||
|
||||
nested.so: $(OBJ) nested.o
|
||||
$(LD) $(LDOPTS) $(OBJ) nested.o -o nested.so
|
||||
|
||||
pickle1.so: $(OBJ) pickle1.o
|
||||
$(LD) $(LDOPTS) $(OBJ) pickle1.o -o pickle1.so
|
||||
|
||||
pickle2.so: $(OBJ) pickle2.o
|
||||
$(LD) $(LDOPTS) $(OBJ) pickle2.o -o pickle2.so
|
||||
|
||||
pickle3.so: $(OBJ) pickle3.o
|
||||
$(LD) $(LDOPTS) $(OBJ) pickle3.o -o pickle3.so
|
||||
|
||||
noncopyable_export.so: $(OBJ) noncopyable_export.o
|
||||
$(LD) $(LDOPTS) $(OBJ) $(HIDDEN) \
|
||||
noncopyable_export.o -o noncopyable_export.so
|
||||
|
||||
noncopyable_import.so: $(OBJ) noncopyable_import.o
|
||||
$(LD) $(LDOPTS) $(OBJ) $(HIDDEN) \
|
||||
noncopyable_import.o -o noncopyable_import.so
|
||||
|
||||
ivect.so: $(OBJ) ivect.o
|
||||
$(LD) $(LDOPTS) $(OBJ) $(HIDDEN) ivect.o -o ivect.so
|
||||
|
||||
dvect.so: $(OBJ) dvect.o
|
||||
$(LD) $(LDOPTS) $(OBJ) $(HIDDEN) dvect.o -o dvect.so
|
||||
|
||||
richcmp1.so: $(OBJ) richcmp1.o
|
||||
$(LD) $(LDOPTS) $(OBJ) richcmp1.o -o richcmp1.so
|
||||
|
||||
richcmp2.so: $(OBJ) richcmp2.o
|
||||
$(LD) $(LDOPTS) $(OBJ) richcmp2.o -o richcmp2.so
|
||||
|
||||
richcmp3.so: $(OBJ) richcmp3.o
|
||||
$(LD) $(LDOPTS) $(OBJ) richcmp3.o -o richcmp3.so
|
||||
|
||||
.cpp.o:
|
||||
$(CPP) $(CPPOPTS) -c $*.cpp
|
||||
|
||||
test:
|
||||
$(PYEXE) comprehensive.py
|
||||
$(PYEXE) test_abstract.py
|
||||
$(PYEXE) test_getting_started1.py
|
||||
$(PYEXE) test_getting_started2.py
|
||||
$(PYEXE) test_simple_vector.py
|
||||
$(PYEXE) test_do_it_yourself_convts.py
|
||||
$(PYEXE) test_nested.py
|
||||
$(PYEXE) test_pickle1.py
|
||||
$(PYEXE) test_pickle2.py
|
||||
$(PYEXE) test_pickle3.py
|
||||
$(PYEXE) test_cross_module.py
|
||||
$(PYEXE) test_richcmp1.py
|
||||
$(PYEXE) test_richcmp2.py
|
||||
$(PYEXE) test_richcmp3.py
|
||||
|
||||
clean:
|
||||
rm -f $(OBJ) libboost_python.a libboost_python.a.input
|
||||
rm -f comprehensive.o boost_python_test.so
|
||||
rm -f abstract.o abstract.so
|
||||
rm -f getting_started1.o getting_started1.so
|
||||
rm -f getting_started2.o getting_started2.so
|
||||
rm -f simple_vector.o simple_vector.so
|
||||
rm -f do_it_yourself_convts.o do_it_yourself_convts.so
|
||||
rm -f nested.o nested.so
|
||||
rm -f pickle1.o pickle1.so
|
||||
rm -f pickle2.o pickle2.so
|
||||
rm -f pickle3.o pickle3.so
|
||||
rm -f noncopyable_export.o noncopyable_export.so
|
||||
rm -f noncopyable_import.o noncopyable_import.so
|
||||
rm -f ivect.o ivect.so
|
||||
rm -f dvect.o dvect.so
|
||||
rm -f richcmp1.o richcmp1.so
|
||||
rm -f richcmp2.o richcmp2.so
|
||||
rm -f richcmp3.o richcmp3.so
|
||||
rm -f so_locations *.pyc
|
||||
rm -rf ii_files
|
||||
|
||||
softlinks:
|
||||
$(PYEXE) $(BOOST)/libs/python/build/filemgr.py $(BOOST) softlinks
|
||||
|
||||
unlink:
|
||||
$(PYEXE) $(BOOST)/libs/python/build/filemgr.py $(BOOST) unlink
|
||||
|
||||
cp:
|
||||
$(PYEXE) $(BOOST)/libs/python/build/filemgr.py $(BOOST) cp
|
||||
|
||||
rm:
|
||||
$(PYEXE) $(BOOST)/libs/python/build/filemgr.py $(BOOST) rm
|
||||
|
||||
depend:
|
||||
@ cat Makefile.nodepend; \
|
||||
for obj in $(DEPOBJ); \
|
||||
do \
|
||||
bn=`echo "$$obj" | cut -d. -f1`; \
|
||||
$(CPP) $(CPPOPTS) $(MAKEDEP) "$$bn".cpp; \
|
||||
done
|
||||
|
||||
@@ -1,184 +0,0 @@
|
||||
# Usage:
|
||||
#
|
||||
# Create a new empty directory anywhere (preferably not in the boost tree).
|
||||
# Copy this Makefile to that new directory and rename it to "Makefile"
|
||||
# Adjust the pathnames below.
|
||||
#
|
||||
# make softlinks Create softlinks to source code and tests
|
||||
# make Compile all sources
|
||||
# make test Run doctest tests
|
||||
# make clean Remove all object files
|
||||
# make unlink Remove softlinks
|
||||
#
|
||||
# Revision history:
|
||||
# 12 Apr 01 new macro ROOT to simplify configuration (R.W. Grosse-Kunstleve)
|
||||
# Initial version: R.W. Grosse-Kunstleve
|
||||
|
||||
ROOT=$(HOME)
|
||||
BOOST=$(ROOT)/boost
|
||||
|
||||
#PYEXE=PYTHONPATH=. /usr/bin/python
|
||||
#PYINC=-I/usr/include/python1.5
|
||||
#PYEXE=PYTHONPATH=. /usr/local/Python-1.5.2/bin/python
|
||||
#PYINC=-I/usr/local/Python-1.5.2/include/python1.5
|
||||
PYEXE=PYTHONPATH=. /usr/local_cci/Python-2.1.1/bin/python
|
||||
PYINC=-I/usr/local_cci/Python-2.1.1/include/python2.1
|
||||
|
||||
STDOPTS=-fPIC -ftemplate-depth-21
|
||||
WARNOPTS=
|
||||
OPTOPTS=-g
|
||||
|
||||
CPP=g++
|
||||
CPPOPTS=$(STLPORTINC) $(STLPORTOPTS) -I$(BOOST) $(PYINC) \
|
||||
$(STDOPTS) $(WARNOPTS) $(OPTOPTS)
|
||||
MAKEDEP=-M
|
||||
|
||||
LD=$(CPP)
|
||||
LDOPTS=-shared
|
||||
|
||||
OBJ=classes.o conversions.o errors.o extension_class.o functions.o \
|
||||
init_function.o module_builder.o \
|
||||
objects.o types.o cross_module.o
|
||||
DEPOBJ=$(OBJ) \
|
||||
comprehensive.o \
|
||||
abstract.o \
|
||||
getting_started1.o getting_started2.o \
|
||||
simple_vector.o \
|
||||
do_it_yourself_convts.o \
|
||||
nested.o \
|
||||
pickle1.o pickle2.o pickle3.o \
|
||||
noncopyable_export.o noncopyable_import.o \
|
||||
ivect.o dvect.o \
|
||||
richcmp1.o richcmp2.o richcmp3.o
|
||||
|
||||
.SUFFIXES: .o .cpp
|
||||
|
||||
all: libboost_python.a \
|
||||
boost_python_test.so \
|
||||
abstract.so \
|
||||
getting_started1.so getting_started2.so \
|
||||
simple_vector.so \
|
||||
do_it_yourself_convts.so \
|
||||
nested.so \
|
||||
pickle1.so pickle2.so pickle3.so \
|
||||
noncopyable_export.so noncopyable_import.so \
|
||||
ivect.so dvect.so \
|
||||
richcmp1.so richcmp2.so richcmp3.so
|
||||
|
||||
libboost_python.a: $(OBJ)
|
||||
rm -f libboost_python.a
|
||||
ar r libboost_python.a $(OBJ)
|
||||
|
||||
boost_python_test.so: $(OBJ) comprehensive.o
|
||||
$(LD) $(LDOPTS) $(OBJ) comprehensive.o -o boost_python_test.so -lm
|
||||
|
||||
abstract.so: $(OBJ) abstract.o
|
||||
$(LD) $(LDOPTS) $(OBJ) abstract.o -o abstract.so
|
||||
|
||||
getting_started1.so: $(OBJ) getting_started1.o
|
||||
$(LD) $(LDOPTS) $(OBJ) getting_started1.o -o getting_started1.so
|
||||
|
||||
getting_started2.so: $(OBJ) getting_started2.o
|
||||
$(LD) $(LDOPTS) $(OBJ) getting_started2.o -o getting_started2.so
|
||||
|
||||
simple_vector.so: $(OBJ) simple_vector.o
|
||||
$(LD) $(LDOPTS) $(OBJ) simple_vector.o -o simple_vector.so
|
||||
|
||||
do_it_yourself_convts.so: $(OBJ) do_it_yourself_convts.o
|
||||
$(LD) $(LDOPTS) $(OBJ) do_it_yourself_convts.o -o do_it_yourself_convts.so
|
||||
|
||||
nested.so: $(OBJ) nested.o
|
||||
$(LD) $(LDOPTS) $(OBJ) nested.o -o nested.so
|
||||
|
||||
pickle1.so: $(OBJ) pickle1.o
|
||||
$(LD) $(LDOPTS) $(OBJ) pickle1.o -o pickle1.so
|
||||
|
||||
pickle2.so: $(OBJ) pickle2.o
|
||||
$(LD) $(LDOPTS) $(OBJ) pickle2.o -o pickle2.so
|
||||
|
||||
pickle3.so: $(OBJ) pickle3.o
|
||||
$(LD) $(LDOPTS) $(OBJ) pickle3.o -o pickle3.so
|
||||
|
||||
noncopyable_export.so: $(OBJ) noncopyable_export.o
|
||||
$(LD) $(LDOPTS) $(OBJ) $(HIDDEN) \
|
||||
noncopyable_export.o -o noncopyable_export.so
|
||||
|
||||
noncopyable_import.so: $(OBJ) noncopyable_import.o
|
||||
$(LD) $(LDOPTS) $(OBJ) $(HIDDEN) \
|
||||
noncopyable_import.o -o noncopyable_import.so
|
||||
|
||||
ivect.so: $(OBJ) ivect.o
|
||||
$(LD) $(LDOPTS) $(OBJ) $(HIDDEN) ivect.o -o ivect.so
|
||||
|
||||
dvect.so: $(OBJ) dvect.o
|
||||
$(LD) $(LDOPTS) $(OBJ) $(HIDDEN) dvect.o -o dvect.so
|
||||
|
||||
richcmp1.so: $(OBJ) richcmp1.o
|
||||
$(LD) $(LDOPTS) $(OBJ) richcmp1.o -o richcmp1.so
|
||||
|
||||
richcmp2.so: $(OBJ) richcmp2.o
|
||||
$(LD) $(LDOPTS) $(OBJ) richcmp2.o -o richcmp2.so
|
||||
|
||||
richcmp3.so: $(OBJ) richcmp3.o
|
||||
$(LD) $(LDOPTS) $(OBJ) richcmp3.o -o richcmp3.so
|
||||
|
||||
.cpp.o:
|
||||
$(CPP) $(CPPOPTS) -c $*.cpp
|
||||
|
||||
test:
|
||||
$(PYEXE) comprehensive.py
|
||||
$(PYEXE) test_abstract.py
|
||||
$(PYEXE) test_getting_started1.py
|
||||
$(PYEXE) test_getting_started2.py
|
||||
$(PYEXE) test_simple_vector.py
|
||||
$(PYEXE) test_do_it_yourself_convts.py
|
||||
$(PYEXE) test_nested.py
|
||||
$(PYEXE) test_pickle1.py
|
||||
$(PYEXE) test_pickle2.py
|
||||
$(PYEXE) test_pickle3.py
|
||||
$(PYEXE) test_cross_module.py
|
||||
$(PYEXE) test_richcmp1.py
|
||||
$(PYEXE) test_richcmp2.py
|
||||
$(PYEXE) test_richcmp3.py
|
||||
|
||||
clean:
|
||||
rm -f $(OBJ) libboost_python.a libboost_python.a.input
|
||||
rm -f comprehensive.o boost_python_test.so
|
||||
rm -f abstract.o abstract.so
|
||||
rm -f getting_started1.o getting_started1.so
|
||||
rm -f getting_started2.o getting_started2.so
|
||||
rm -f simple_vector.o simple_vector.so
|
||||
rm -f do_it_yourself_convts.o do_it_yourself_convts.so
|
||||
rm -f nested.o nested.so
|
||||
rm -f pickle1.o pickle1.so
|
||||
rm -f pickle2.o pickle2.so
|
||||
rm -f pickle3.o pickle3.so
|
||||
rm -f noncopyable_export.o noncopyable_export.so
|
||||
rm -f noncopyable_import.o noncopyable_import.so
|
||||
rm -f ivect.o ivect.so
|
||||
rm -f dvect.o dvect.so
|
||||
rm -f richcmp1.o richcmp1.so
|
||||
rm -f richcmp2.o richcmp2.so
|
||||
rm -f richcmp3.o richcmp3.so
|
||||
rm -f so_locations *.pyc
|
||||
|
||||
softlinks:
|
||||
$(PYEXE) $(BOOST)/libs/python/build/filemgr.py $(BOOST) softlinks
|
||||
|
||||
unlink:
|
||||
$(PYEXE) $(BOOST)/libs/python/build/filemgr.py $(BOOST) unlink
|
||||
|
||||
cp:
|
||||
$(PYEXE) $(BOOST)/libs/python/build/filemgr.py $(BOOST) cp
|
||||
|
||||
rm:
|
||||
$(PYEXE) $(BOOST)/libs/python/build/filemgr.py $(BOOST) rm
|
||||
|
||||
depend:
|
||||
@ cat Makefile.nodepend; \
|
||||
for obj in $(DEPOBJ); \
|
||||
do \
|
||||
bn=`echo "$$obj" | cut -d. -f1`; \
|
||||
$(CPP) $(CPPOPTS) $(MAKEDEP) "$$bn".cpp; \
|
||||
done
|
||||
|
||||
@@ -1,222 +0,0 @@
|
||||
# Usage:
|
||||
#
|
||||
# make copy Copy the sources and tests
|
||||
# make Compile all sources
|
||||
# make test Run doctest tests
|
||||
# make clean Remove all object files
|
||||
# make del Remove the sources and tests
|
||||
#
|
||||
# Revision history:
|
||||
# 12 Apr 01 new macro ROOT to simplify configuration (R.W. Grosse-Kunstleve)
|
||||
# Initial version: R.W. Grosse-Kunstleve
|
||||
|
||||
# To install mingw32, follow instructions at:
|
||||
# http://starship.python.net/crew/kernr/mingw32/Notes.html
|
||||
# In particular, install:
|
||||
# ftp://ftp.xraylith.wisc.edu/pub/khan/gnu-win32/mingw32/gcc-2.95.2/gcc-2.95.2-msvcrt.exe
|
||||
# ftp://ftp.xraylith.wisc.edu/pub/khan/gnu-win32/mingw32/gcc-2.95.2/fixes/quote-fix-msvcrt.exe
|
||||
# http://starship.python.net/crew/kernr/mingw32/Python-1.5.2-mingw32.zip
|
||||
# Unpack the first two archives in the default locations and update your PATH.
|
||||
# Unpack the third archive in \usr.
|
||||
|
||||
# Note: comprehensive.cpp generates compiler errors and later crashes.
|
||||
# L:\boost\boost\python\detail\extension_class.hpp:643: warning:
|
||||
# alignment of `vtable for class
|
||||
# boost::python::detail::held_instance<bpl_test::Derived1>'
|
||||
# is greater than maximum object file alignment. Using 16.
|
||||
# Could this be fixed with compiler options?
|
||||
# -fhuge-objects looks interesting, but requires recompiling the C++ library.
|
||||
# (what exactly does that mean?)
|
||||
# -fvtable-thunks eliminates the compiler warning, but
|
||||
# "import boost_python_test" still causes a crash.
|
||||
|
||||
ROOT=R:
|
||||
BOOST_WIN="$(ROOT)\boost"
|
||||
BOOST_UNIX=$(HOME)/boost
|
||||
|
||||
PYEXE="C:\Program files\Python\python.exe"
|
||||
PYINC=-I"C:\usr\include\python1.5"
|
||||
PYLIB="C:\usr\lib\libpython15.a"
|
||||
#PYEXE="C:\Python21\python.exe"
|
||||
#PYINC=-I"C:\usr\include\python2.1"
|
||||
#PYLIB="C:\usr\lib\libpython21.a"
|
||||
|
||||
STDOPTS=-ftemplate-depth-21
|
||||
WARNOPTS=
|
||||
OPTOPTS=-g
|
||||
|
||||
CPP=g++
|
||||
CPPOPTS=$(STLPORTINC) $(STLPORTOPTS) -I$(BOOST_WIN) $(PYINC) \
|
||||
$(STDOPTS) $(WARNOPTS) $(OPTOPTS)
|
||||
|
||||
LD=g++
|
||||
LDOPTS=-shared
|
||||
|
||||
OBJ=classes.o conversions.o errors.o extension_class.o functions.o \
|
||||
init_function.o module_builder.o \
|
||||
objects.o types.o cross_module.o
|
||||
|
||||
.SUFFIXES: .o .cpp
|
||||
|
||||
all: libboost_python.a \
|
||||
abstract.pyd \
|
||||
getting_started1.pyd getting_started2.pyd \
|
||||
simple_vector.pyd \
|
||||
do_it_yourself_convts.pyd \
|
||||
nested.pyd \
|
||||
pickle1.pyd pickle2.pyd pickle3.pyd \
|
||||
noncopyable_export.pyd noncopyable_import.pyd \
|
||||
ivect.pyd dvect.pyd \
|
||||
richcmp1.pyd richcmp2.pyd richcmp3.pyd
|
||||
|
||||
libboost_python.a: $(OBJ)
|
||||
-del libboost_python.a
|
||||
ar r libboost_python.a $(OBJ)
|
||||
|
||||
DLLWRAPOPTS=-s --driver-name g++ -s \
|
||||
--entry _DllMainCRTStartup@12 --target=i386-mingw32
|
||||
|
||||
boost_python_test.pyd: $(OBJ) comprehensive.o
|
||||
dllwrap $(DLLWRAPOPTS) \
|
||||
--dllname boost_python_test.pyd \
|
||||
--def boost_python_test.def \
|
||||
$(OBJ) comprehensive.o $(PYLIB)
|
||||
|
||||
abstract.pyd: $(OBJ) abstract.o
|
||||
dllwrap $(DLLWRAPOPTS) \
|
||||
--dllname abstract.pyd \
|
||||
--def abstract.def \
|
||||
$(OBJ) abstract.o $(PYLIB)
|
||||
|
||||
getting_started1.pyd: $(OBJ) getting_started1.o
|
||||
dllwrap $(DLLWRAPOPTS) \
|
||||
--dllname getting_started1.pyd \
|
||||
--def getting_started1.def \
|
||||
$(OBJ) getting_started1.o $(PYLIB)
|
||||
|
||||
getting_started2.pyd: $(OBJ) getting_started2.o
|
||||
dllwrap $(DLLWRAPOPTS) \
|
||||
--dllname getting_started2.pyd \
|
||||
--def getting_started2.def \
|
||||
$(OBJ) getting_started2.o $(PYLIB)
|
||||
|
||||
simple_vector.pyd: $(OBJ) simple_vector.o
|
||||
dllwrap $(DLLWRAPOPTS) \
|
||||
--dllname simple_vector.pyd \
|
||||
--def simple_vector.def \
|
||||
$(OBJ) simple_vector.o $(PYLIB)
|
||||
|
||||
do_it_yourself_convts.pyd: $(OBJ) do_it_yourself_convts.o
|
||||
dllwrap $(DLLWRAPOPTS) \
|
||||
--dllname do_it_yourself_convts.pyd \
|
||||
--def do_it_yourself_convts.def \
|
||||
$(OBJ) do_it_yourself_convts.o $(PYLIB)
|
||||
|
||||
nested.pyd: $(OBJ) nested.o
|
||||
dllwrap $(DLLWRAPOPTS) \
|
||||
--dllname nested.pyd \
|
||||
--def nested.def \
|
||||
$(OBJ) nested.o $(PYLIB)
|
||||
|
||||
pickle1.pyd: $(OBJ) pickle1.o
|
||||
dllwrap $(DLLWRAPOPTS) \
|
||||
--dllname pickle1.pyd \
|
||||
--def pickle1.def \
|
||||
$(OBJ) pickle1.o $(PYLIB)
|
||||
|
||||
pickle2.pyd: $(OBJ) pickle2.o
|
||||
dllwrap $(DLLWRAPOPTS) \
|
||||
--dllname pickle2.pyd \
|
||||
--def pickle2.def \
|
||||
$(OBJ) pickle2.o $(PYLIB)
|
||||
|
||||
pickle3.pyd: $(OBJ) pickle3.o
|
||||
dllwrap $(DLLWRAPOPTS) \
|
||||
--dllname pickle3.pyd \
|
||||
--def pickle3.def \
|
||||
$(OBJ) pickle3.o $(PYLIB)
|
||||
|
||||
noncopyable_export.pyd: $(OBJ) noncopyable_export.o
|
||||
dllwrap $(DLLWRAPOPTS) \
|
||||
--dllname noncopyable_export.pyd \
|
||||
--def noncopyable_export.def \
|
||||
$(OBJ) noncopyable_export.o $(PYLIB)
|
||||
|
||||
noncopyable_import.pyd: $(OBJ) noncopyable_import.o
|
||||
dllwrap $(DLLWRAPOPTS) \
|
||||
--dllname noncopyable_import.pyd \
|
||||
--def noncopyable_import.def \
|
||||
$(OBJ) noncopyable_import.o $(PYLIB)
|
||||
|
||||
ivect.pyd: $(OBJ) ivect.o
|
||||
dllwrap $(DLLWRAPOPTS) \
|
||||
--dllname ivect.pyd \
|
||||
--def ivect.def \
|
||||
$(OBJ) ivect.o $(PYLIB)
|
||||
|
||||
dvect.pyd: $(OBJ) dvect.o
|
||||
dllwrap $(DLLWRAPOPTS) \
|
||||
--dllname dvect.pyd \
|
||||
--def dvect.def \
|
||||
$(OBJ) dvect.o $(PYLIB)
|
||||
|
||||
richcmp1.pyd: $(OBJ) richcmp1.o
|
||||
dllwrap $(DLLWRAPOPTS) \
|
||||
--dllname richcmp1.pyd \
|
||||
--def richcmp1.def \
|
||||
$(OBJ) richcmp1.o $(PYLIB)
|
||||
|
||||
richcmp2.pyd: $(OBJ) richcmp2.o
|
||||
dllwrap $(DLLWRAPOPTS) \
|
||||
--dllname richcmp2.pyd \
|
||||
--def richcmp2.def \
|
||||
$(OBJ) richcmp2.o $(PYLIB)
|
||||
|
||||
richcmp3.pyd: $(OBJ) richcmp3.o
|
||||
dllwrap $(DLLWRAPOPTS) \
|
||||
--dllname richcmp3.pyd \
|
||||
--def richcmp3.def \
|
||||
$(OBJ) richcmp3.o $(PYLIB)
|
||||
|
||||
.cpp.o:
|
||||
$(CPP) $(CPPOPTS) -c $*.cpp
|
||||
|
||||
test:
|
||||
# $(PYEXE) comprehensive.py
|
||||
$(PYEXE) test_abstract.py
|
||||
$(PYEXE) test_getting_started1.py
|
||||
$(PYEXE) test_getting_started2.py
|
||||
$(PYEXE) test_simple_vector.py
|
||||
$(PYEXE) test_do_it_yourself_convts.py
|
||||
$(PYEXE) test_nested.py
|
||||
$(PYEXE) test_pickle1.py
|
||||
$(PYEXE) test_pickle2.py
|
||||
$(PYEXE) test_pickle3.py
|
||||
$(PYEXE) test_cross_module.py
|
||||
$(PYEXE) test_richcmp1.py
|
||||
$(PYEXE) test_richcmp2.py
|
||||
$(PYEXE) test_richcmp3.py
|
||||
|
||||
clean:
|
||||
-del *.o
|
||||
-del *.a
|
||||
-del *.pyd
|
||||
-del *.pyc
|
||||
|
||||
softlinks:
|
||||
python $(BOOST_UNIX)/libs/python/build/filemgr.py $(BOOST_UNIX) softlinks
|
||||
|
||||
unlink:
|
||||
python $(BOOST_UNIX)/libs/python/build/filemgr.py $(BOOST_UNIX) unlink
|
||||
|
||||
cp:
|
||||
python $(BOOST_UNIX)/libs/python/build/filemgr.py $(BOOST_UNIX) cp
|
||||
|
||||
rm:
|
||||
python $(BOOST_UNIX)/libs/python/build/filemgr.py $(BOOST_UNIX) rm
|
||||
|
||||
copy:
|
||||
$(PYEXE) $(BOOST_WIN)\libs\python\build\filemgr.py $(BOOST_WIN) copy
|
||||
|
||||
del:
|
||||
$(PYEXE) $(BOOST_WIN)\libs\python\build\filemgr.py $(BOOST_WIN) del
|
||||
BIN
build/python_v1.zip
Normal file
@@ -1,199 +0,0 @@
|
||||
# Usage:
|
||||
#
|
||||
# Create a new empty directory anywhere (preferably not in the boost tree).
|
||||
# Copy this Makefile to that new directory and rename it to "Makefile"
|
||||
# Adjust the pathnames below.
|
||||
#
|
||||
# make softlinks Create softlinks to source code and tests
|
||||
# make Compile all sources
|
||||
# make test Run doctest tests
|
||||
# make clean Remove all object files
|
||||
# make unlink Remove softlinks
|
||||
#
|
||||
# Revision history:
|
||||
# 12 Apr 01 new macro ROOT to simplify configuration (R.W. Grosse-Kunstleve)
|
||||
# Initial version: R.W. Grosse-Kunstleve
|
||||
|
||||
ROOT=$(HOME)
|
||||
BOOST=$(ROOT)/boost
|
||||
|
||||
#PYEXE=PYTHONPATH=. /usr/local/Python-1.5.2/bin/python
|
||||
#PYINC=-I/usr/local/Python-1.5.2/include/python1.5
|
||||
PYEXE=PYTHONPATH=. /usr/local_cci/Python-2.1.1/bin/python
|
||||
PYINC=-I/usr/local_cci/Python-2.1.1/include/python2.1
|
||||
#STLPORTINC=-I/usr/local/STLport-4.1b3/stlport
|
||||
#STLPORTINC=-I/usr/local/STLport-4.1b4/stlport
|
||||
#STLPORTOPTS= \
|
||||
# -D__USE_STD_IOSTREAM \
|
||||
# -D__STL_NO_SGI_IOSTREAMS \
|
||||
# -D__STL_USE_NATIVE_STRING \
|
||||
# -D__STL_NO_NEW_C_HEADERS \
|
||||
# -D_RWSTD_COMPILE_INSTANTIATE=1
|
||||
STLPORTINC=-I$(BOOST)/boost/compatibility/cpp_c_headers
|
||||
|
||||
STDOPTS=-std strict_ansi
|
||||
# use -msg_display_number to obtain integer tags for -msg_disable
|
||||
WARNOPTS=-msg_disable 186,450,1115
|
||||
OPTOPTS=-g
|
||||
|
||||
CPP=cxx
|
||||
CPPOPTS=$(STLPORTINC) $(STLPORTOPTS) -I$(BOOST) $(PYINC) \
|
||||
$(STDOPTS) $(WARNOPTS) $(OPTOPTS)
|
||||
MAKEDEP=-Em
|
||||
|
||||
LD=cxx
|
||||
LDOPTS=-shared -expect_unresolved 'Py*' -expect_unresolved '_Py*'
|
||||
|
||||
#HIDDEN=-hidden
|
||||
|
||||
OBJ=classes.o conversions.o errors.o extension_class.o functions.o \
|
||||
init_function.o module_builder.o \
|
||||
objects.o types.o cross_module.o
|
||||
DEPOBJ=$(OBJ) \
|
||||
comprehensive.o \
|
||||
abstract.o \
|
||||
getting_started1.o getting_started2.o \
|
||||
simple_vector.o \
|
||||
do_it_yourself_convts.o \
|
||||
nested.o \
|
||||
pickle1.o pickle2.o pickle3.o \
|
||||
noncopyable_export.o noncopyable_import.o \
|
||||
ivect.o dvect.o \
|
||||
richcmp1.o richcmp2.o richcmp3.o
|
||||
|
||||
.SUFFIXES: .o .cpp
|
||||
|
||||
all: libboost_python.a \
|
||||
boost_python_test.so \
|
||||
abstract.so \
|
||||
getting_started1.so getting_started2.so \
|
||||
simple_vector.so \
|
||||
do_it_yourself_convts.so \
|
||||
nested.so \
|
||||
pickle1.so pickle2.so pickle3.so \
|
||||
noncopyable_export.so noncopyable_import.so \
|
||||
ivect.so dvect.so \
|
||||
richcmp1.so richcmp2.so richcmp3.so
|
||||
|
||||
libboost_python.a: $(OBJ)
|
||||
rm -f libboost_python.a
|
||||
cd cxx_repository; \
|
||||
ls -1 > ../libboost_python.a.input; \
|
||||
ar r ../libboost_python.a -input ../libboost_python.a.input
|
||||
rm -f libboost_python.a.input
|
||||
ar r libboost_python.a $(OBJ)
|
||||
|
||||
boost_python_test.so: $(OBJ) comprehensive.o
|
||||
$(LD) $(LDOPTS) $(OBJ) comprehensive.o -o boost_python_test.so -lm
|
||||
|
||||
abstract.so: $(OBJ) abstract.o
|
||||
$(LD) $(LDOPTS) $(OBJ) abstract.o -o abstract.so
|
||||
|
||||
getting_started1.so: $(OBJ) getting_started1.o
|
||||
$(LD) $(LDOPTS) $(OBJ) getting_started1.o -o getting_started1.so
|
||||
|
||||
getting_started2.so: $(OBJ) getting_started2.o
|
||||
$(LD) $(LDOPTS) $(OBJ) getting_started2.o -o getting_started2.so
|
||||
|
||||
simple_vector.so: $(OBJ) simple_vector.o
|
||||
$(LD) $(LDOPTS) $(OBJ) simple_vector.o -o simple_vector.so
|
||||
|
||||
do_it_yourself_convts.so: $(OBJ) do_it_yourself_convts.o
|
||||
$(LD) $(LDOPTS) $(OBJ) do_it_yourself_convts.o -o do_it_yourself_convts.so
|
||||
|
||||
nested.so: $(OBJ) nested.o
|
||||
$(LD) $(LDOPTS) $(OBJ) nested.o -o nested.so
|
||||
|
||||
pickle1.so: $(OBJ) pickle1.o
|
||||
$(LD) $(LDOPTS) $(OBJ) pickle1.o -o pickle1.so
|
||||
|
||||
pickle2.so: $(OBJ) pickle2.o
|
||||
$(LD) $(LDOPTS) $(OBJ) pickle2.o -o pickle2.so
|
||||
|
||||
pickle3.so: $(OBJ) pickle3.o
|
||||
$(LD) $(LDOPTS) $(OBJ) pickle3.o -o pickle3.so
|
||||
|
||||
noncopyable_export.so: $(OBJ) noncopyable_export.o
|
||||
$(LD) $(LDOPTS) $(OBJ) $(HIDDEN) \
|
||||
noncopyable_export.o -o noncopyable_export.so
|
||||
|
||||
noncopyable_import.so: $(OBJ) noncopyable_import.o
|
||||
$(LD) $(LDOPTS) $(OBJ) $(HIDDEN) \
|
||||
noncopyable_import.o -o noncopyable_import.so
|
||||
|
||||
ivect.so: $(OBJ) ivect.o
|
||||
$(LD) $(LDOPTS) $(OBJ) $(HIDDEN) ivect.o -o ivect.so
|
||||
|
||||
dvect.so: $(OBJ) dvect.o
|
||||
$(LD) $(LDOPTS) $(OBJ) $(HIDDEN) dvect.o -o dvect.so
|
||||
|
||||
richcmp1.so: $(OBJ) richcmp1.o
|
||||
$(LD) $(LDOPTS) $(OBJ) richcmp1.o -o richcmp1.so
|
||||
|
||||
richcmp2.so: $(OBJ) richcmp2.o
|
||||
$(LD) $(LDOPTS) $(OBJ) richcmp2.o -o richcmp2.so
|
||||
|
||||
richcmp3.so: $(OBJ) richcmp3.o
|
||||
$(LD) $(LDOPTS) $(OBJ) richcmp3.o -o richcmp3.so
|
||||
|
||||
.cpp.o:
|
||||
$(CPP) $(CPPOPTS) -c $*.cpp
|
||||
|
||||
test:
|
||||
$(PYEXE) comprehensive.py
|
||||
$(PYEXE) test_abstract.py
|
||||
$(PYEXE) test_getting_started1.py
|
||||
$(PYEXE) test_getting_started2.py
|
||||
$(PYEXE) test_simple_vector.py
|
||||
$(PYEXE) test_do_it_yourself_convts.py
|
||||
$(PYEXE) test_nested.py
|
||||
$(PYEXE) test_pickle1.py
|
||||
$(PYEXE) test_pickle2.py
|
||||
$(PYEXE) test_pickle3.py
|
||||
$(PYEXE) test_cross_module.py
|
||||
$(PYEXE) test_richcmp1.py
|
||||
$(PYEXE) test_richcmp2.py
|
||||
$(PYEXE) test_richcmp3.py
|
||||
|
||||
clean:
|
||||
rm -f $(OBJ) libboost_python.a libboost_python.a.input
|
||||
rm -f comprehensive.o boost_python_test.so
|
||||
rm -f abstract.o abstract.so
|
||||
rm -f getting_started1.o getting_started1.so
|
||||
rm -f getting_started2.o getting_started2.so
|
||||
rm -f simple_vector.o simple_vector.so
|
||||
rm -f do_it_yourself_convts.o do_it_yourself_convts.so
|
||||
rm -f nested.o nested.so
|
||||
rm -f pickle1.o pickle1.so
|
||||
rm -f pickle2.o pickle2.so
|
||||
rm -f pickle3.o pickle3.so
|
||||
rm -f noncopyable_export.o noncopyable_export.so
|
||||
rm -f noncopyable_import.o noncopyable_import.so
|
||||
rm -f ivect.o ivect.so
|
||||
rm -f dvect.o dvect.so
|
||||
rm -f richcmp1.o richcmp1.so
|
||||
rm -f richcmp2.o richcmp2.so
|
||||
rm -f richcmp3.o richcmp3.so
|
||||
rm -f so_locations *.pyc
|
||||
rm -rf cxx_repository
|
||||
|
||||
softlinks:
|
||||
$(PYEXE) $(BOOST)/libs/python/build/filemgr.py $(BOOST) softlinks
|
||||
|
||||
unlink:
|
||||
$(PYEXE) $(BOOST)/libs/python/build/filemgr.py $(BOOST) unlink
|
||||
|
||||
cp:
|
||||
$(PYEXE) $(BOOST)/libs/python/build/filemgr.py $(BOOST) cp
|
||||
|
||||
rm:
|
||||
$(PYEXE) $(BOOST)/libs/python/build/filemgr.py $(BOOST) rm
|
||||
|
||||
depend:
|
||||
@ cat Makefile.nodepend; \
|
||||
for obj in $(DEPOBJ); \
|
||||
do \
|
||||
bn=`echo "$$obj" | cut -d. -f1`; \
|
||||
$(CPP) $(CPPOPTS) $(MAKEDEP) "$$bn".cpp; \
|
||||
done
|
||||
|
||||
154
build/vc60.mak
@@ -1,154 +0,0 @@
|
||||
# Usage:
|
||||
#
|
||||
# Create a new empty directory anywhere (preferably not in the boost tree).
|
||||
# Copy this Makefile to that new directory and rename it to "Makefile"
|
||||
# Adjust the pathnames below.
|
||||
#
|
||||
# make copy Copy the sources and tests
|
||||
# make Compile all sources
|
||||
# make test Run doctest tests
|
||||
# make clean Remove all object files
|
||||
# make del Remove the sources and tests
|
||||
#
|
||||
# Revision history:
|
||||
# 12 Apr 01 new macro ROOT to simplify configuration (R.W. Grosse-Kunstleve)
|
||||
# Initial version: R.W. Grosse-Kunstleve
|
||||
|
||||
ROOT=R:
|
||||
BOOST_WIN="$(ROOT)\boost"
|
||||
BOOST_UNIX=$(HOME)/boost
|
||||
|
||||
#PYEXE="C:\Program files\Python\python.exe"
|
||||
#PYINC=/I"C:\Program files\Python\include"
|
||||
#PYLIB="C:\Program files\Python\libs\python15.lib"
|
||||
PYEXE="C:\Python21\python.exe"
|
||||
PYINC=/I"C:\Python21\include"
|
||||
PYLIB="C:\Python21\libs\python21.lib"
|
||||
|
||||
STDOPTS=/nologo /MD /GR /GX /Zm300 /DBOOST_PYTHON_STATIC_LIB
|
||||
WARNOPTS=
|
||||
OPTOPTS=
|
||||
|
||||
CPP=cl.exe
|
||||
CPPOPTS=$(STLPORTINC) $(STLPORTOPTS) /I$(BOOST_WIN) $(PYINC) \
|
||||
$(STDOPTS) $(WARNOPTS) $(OPTOPTS)
|
||||
|
||||
LD=link.exe
|
||||
LDOPTS=/nologo /dll /incremental:no
|
||||
|
||||
OBJ=classes.obj conversions.obj errors.obj extension_class.obj functions.obj \
|
||||
init_function.obj module_builder.obj \
|
||||
objects.obj types.obj cross_module.obj
|
||||
|
||||
.SUFFIXES: .obj .cpp
|
||||
|
||||
all: boost_python.lib \
|
||||
boost_python_test.pyd \
|
||||
abstract.pyd \
|
||||
getting_started1.pyd getting_started2.pyd \
|
||||
simple_vector.pyd \
|
||||
do_it_yourself_convts.pyd \
|
||||
nested.pyd \
|
||||
pickle1.pyd pickle2.pyd pickle3.pyd \
|
||||
noncopyable_export.pyd noncopyable_import.pyd \
|
||||
ivect.pyd dvect.pyd \
|
||||
richcmp1.pyd richcmp2.pyd richcmp3.pyd
|
||||
|
||||
boost_python.lib: $(OBJ)
|
||||
$(LD) -lib /nologo /out:boost_python.lib $(OBJ)
|
||||
|
||||
boost_python_test.pyd: $(OBJ) comprehensive.obj
|
||||
$(LD) $(LDOPTS) $(OBJ) comprehensive.obj $(PYLIB) /export:initboost_python_test /out:"boost_python_test.pyd"
|
||||
|
||||
abstract.pyd: $(OBJ) abstract.obj
|
||||
$(LD) $(LDOPTS) $(OBJ) abstract.obj $(PYLIB) /export:initabstract /out:"abstract.pyd"
|
||||
|
||||
getting_started1.pyd: $(OBJ) getting_started1.obj
|
||||
$(LD) $(LDOPTS) $(OBJ) getting_started1.obj $(PYLIB) /export:initgetting_started1 /out:"getting_started1.pyd"
|
||||
|
||||
getting_started2.pyd: $(OBJ) getting_started2.obj
|
||||
$(LD) $(LDOPTS) $(OBJ) getting_started2.obj $(PYLIB) /export:initgetting_started2 /out:"getting_started2.pyd"
|
||||
|
||||
simple_vector.pyd: $(OBJ) simple_vector.obj
|
||||
$(LD) $(LDOPTS) $(OBJ) simple_vector.obj $(PYLIB) /export:initsimple_vector /out:"simple_vector.pyd"
|
||||
|
||||
do_it_yourself_convts.pyd: $(OBJ) do_it_yourself_convts.obj
|
||||
$(LD) $(LDOPTS) $(OBJ) do_it_yourself_convts.obj $(PYLIB) /export:initdo_it_yourself_convts /out:"do_it_yourself_convts.pyd"
|
||||
|
||||
nested.pyd: $(OBJ) nested.obj
|
||||
$(LD) $(LDOPTS) $(OBJ) nested.obj $(PYLIB) /export:initnested /out:"nested.pyd"
|
||||
|
||||
pickle1.pyd: $(OBJ) pickle1.obj
|
||||
$(LD) $(LDOPTS) $(OBJ) pickle1.obj $(PYLIB) /export:initpickle1 /out:"pickle1.pyd"
|
||||
|
||||
pickle2.pyd: $(OBJ) pickle2.obj
|
||||
$(LD) $(LDOPTS) $(OBJ) pickle2.obj $(PYLIB) /export:initpickle2 /out:"pickle2.pyd"
|
||||
|
||||
pickle3.pyd: $(OBJ) pickle3.obj
|
||||
$(LD) $(LDOPTS) $(OBJ) pickle3.obj $(PYLIB) /export:initpickle3 /out:"pickle3.pyd"
|
||||
|
||||
noncopyable_export.pyd: $(OBJ) noncopyable_export.obj
|
||||
$(LD) $(LDOPTS) $(OBJ) noncopyable_export.obj $(PYLIB) /export:initnoncopyable_export /out:"noncopyable_export.pyd"
|
||||
|
||||
noncopyable_import.pyd: $(OBJ) noncopyable_import.obj
|
||||
$(LD) $(LDOPTS) $(OBJ) noncopyable_import.obj $(PYLIB) /export:initnoncopyable_import /out:"noncopyable_import.pyd"
|
||||
|
||||
ivect.pyd: $(OBJ) ivect.obj
|
||||
$(LD) $(LDOPTS) $(OBJ) ivect.obj $(PYLIB) /export:initivect /out:"ivect.pyd"
|
||||
|
||||
dvect.pyd: $(OBJ) dvect.obj
|
||||
$(LD) $(LDOPTS) $(OBJ) dvect.obj $(PYLIB) /export:initdvect /out:"dvect.pyd"
|
||||
|
||||
richcmp1.pyd: $(OBJ) richcmp1.obj
|
||||
$(LD) $(LDOPTS) $(OBJ) richcmp1.obj $(PYLIB) /export:initrichcmp1 /out:"richcmp1.pyd"
|
||||
|
||||
richcmp2.pyd: $(OBJ) richcmp2.obj
|
||||
$(LD) $(LDOPTS) $(OBJ) richcmp2.obj $(PYLIB) /export:initrichcmp2 /out:"richcmp2.pyd"
|
||||
|
||||
richcmp3.pyd: $(OBJ) richcmp3.obj
|
||||
$(LD) $(LDOPTS) $(OBJ) richcmp3.obj $(PYLIB) /export:initrichcmp3 /out:"richcmp3.pyd"
|
||||
|
||||
.cpp.obj:
|
||||
$(CPP) $(CPPOPTS) /c $*.cpp
|
||||
|
||||
test:
|
||||
$(PYEXE) comprehensive.py --broken-auto-ptr
|
||||
$(PYEXE) test_abstract.py
|
||||
$(PYEXE) test_getting_started1.py
|
||||
$(PYEXE) test_getting_started2.py
|
||||
$(PYEXE) test_simple_vector.py
|
||||
$(PYEXE) test_do_it_yourself_convts.py
|
||||
$(PYEXE) test_nested.py
|
||||
$(PYEXE) test_pickle1.py
|
||||
$(PYEXE) test_pickle2.py
|
||||
$(PYEXE) test_pickle3.py
|
||||
$(PYEXE) test_cross_module.py --broken-auto-ptr
|
||||
$(PYEXE) test_richcmp1.py
|
||||
$(PYEXE) test_richcmp2.py
|
||||
$(PYEXE) test_richcmp3.py
|
||||
|
||||
clean:
|
||||
-del *.obj
|
||||
-del *.lib
|
||||
-del *.exp
|
||||
-del *.idb
|
||||
-del *.pyd
|
||||
-del *.pyc
|
||||
|
||||
softlinks:
|
||||
python $(BOOST_UNIX)/libs/python/build/filemgr.py $(BOOST_UNIX) softlinks
|
||||
|
||||
unlink:
|
||||
python $(BOOST_UNIX)/libs/python/build/filemgr.py $(BOOST_UNIX) unlink
|
||||
|
||||
cp:
|
||||
python $(BOOST_UNIX)/libs/python/build/filemgr.py $(BOOST_UNIX) cp
|
||||
|
||||
rm:
|
||||
python $(BOOST_UNIX)/libs/python/build/filemgr.py $(BOOST_UNIX) rm
|
||||
|
||||
copy:
|
||||
$(PYEXE) $(BOOST_WIN)\libs\python\build\filemgr.py $(BOOST_WIN) copy
|
||||
|
||||
del:
|
||||
$(PYEXE) $(BOOST_WIN)\libs\python\build\filemgr.py $(BOOST_WIN) del
|
||||
@@ -1,149 +0,0 @@
|
||||
# Usage:
|
||||
#
|
||||
# make copy Copy the sources and tests
|
||||
# make Compile all sources
|
||||
# make test Run doctest tests
|
||||
# make clean Remove all object files
|
||||
# make del Remove the sources and tests
|
||||
#
|
||||
# Revision history:
|
||||
# 14 Dec 01 derived from vc60.mak (R.W. Grosse-Kunstleve)
|
||||
|
||||
ROOT=R:
|
||||
BOOST_WIN="$(ROOT)\boost"
|
||||
BOOST_UNIX=$(HOME)/boost
|
||||
|
||||
#PYEXE="C:\Program files\Python\python.exe"
|
||||
#PYINC=-I"C:\Program files\Python\include"
|
||||
#PYLIB="C:\Program files\Python\libs\python15.lib"
|
||||
PYEXE="C:\Python21\python.exe"
|
||||
PYINC=-I"C:\Python21\include"
|
||||
PYLIB="C:\Python21\libs\python21.lib"
|
||||
|
||||
STDOPTS=-gccinc -prefix UseDLLPrefix.h -DBOOST_PYTHON_STATIC_LIB
|
||||
WARNOPTS=-warn on,nounusedexpr,nounused
|
||||
OPTOPTS=-O
|
||||
|
||||
CPP=mwcc
|
||||
CPPOPTS=$(STDOPTS) $(WARNOPTS) $(OPTOPTS) \
|
||||
$(STLPORTINC) $(STLPORTOPTS) -I$(BOOST_WIN) $(PYINC)
|
||||
|
||||
LD=mwld
|
||||
LDOPTS=-export dllexport -shared
|
||||
|
||||
OBJ=classes.obj conversions.obj errors.obj extension_class.obj functions.obj \
|
||||
init_function.obj module_builder.obj \
|
||||
objects.obj types.obj cross_module.obj
|
||||
|
||||
.SUFFIXES: .obj .cpp
|
||||
|
||||
all: libboost_python.lib \
|
||||
boost_python_test.pyd \
|
||||
abstract.pyd \
|
||||
getting_started1.pyd getting_started2.pyd \
|
||||
simple_vector.pyd \
|
||||
do_it_yourself_convts.pyd \
|
||||
nested.pyd \
|
||||
pickle1.pyd pickle2.pyd pickle3.pyd \
|
||||
noncopyable_export.pyd noncopyable_import.pyd \
|
||||
ivect.pyd dvect.pyd \
|
||||
richcmp1.pyd richcmp2.pyd richcmp3.pyd
|
||||
|
||||
libboost_python.lib: $(OBJ)
|
||||
$(LD) -library -o libboost_python.lib $(OBJ)
|
||||
|
||||
boost_python_test.pyd: $(OBJ) comprehensive.obj
|
||||
$(LD) $(LDOPTS) $(OBJ) comprehensive.obj $(PYLIB) -o boost_python_test.pyd
|
||||
|
||||
abstract.pyd: $(OBJ) abstract.obj
|
||||
$(LD) $(LDOPTS) $(OBJ) abstract.obj $(PYLIB) -o abstract.pyd
|
||||
|
||||
getting_started1.pyd: $(OBJ) getting_started1.obj
|
||||
$(LD) $(LDOPTS) $(OBJ) getting_started1.obj $(PYLIB) -o getting_started1.pyd
|
||||
|
||||
getting_started2.pyd: $(OBJ) getting_started2.obj
|
||||
$(LD) $(LDOPTS) $(OBJ) getting_started2.obj $(PYLIB) -o getting_started2.pyd
|
||||
|
||||
simple_vector.pyd: $(OBJ) simple_vector.obj
|
||||
$(LD) $(LDOPTS) $(OBJ) simple_vector.obj $(PYLIB) -o simple_vector.pyd
|
||||
|
||||
do_it_yourself_convts.pyd: $(OBJ) do_it_yourself_convts.obj
|
||||
$(LD) $(LDOPTS) $(OBJ) do_it_yourself_convts.obj $(PYLIB) -o do_it_yourself_convts.pyd
|
||||
|
||||
nested.pyd: $(OBJ) nested.obj
|
||||
$(LD) $(LDOPTS) $(OBJ) nested.obj $(PYLIB) -o nested.pyd
|
||||
|
||||
pickle1.pyd: $(OBJ) pickle1.obj
|
||||
$(LD) $(LDOPTS) $(OBJ) pickle1.obj $(PYLIB) -o pickle1.pyd
|
||||
|
||||
pickle2.pyd: $(OBJ) pickle2.obj
|
||||
$(LD) $(LDOPTS) $(OBJ) pickle2.obj $(PYLIB) -o pickle2.pyd
|
||||
|
||||
pickle3.pyd: $(OBJ) pickle3.obj
|
||||
$(LD) $(LDOPTS) $(OBJ) pickle3.obj $(PYLIB) -o pickle3.pyd
|
||||
|
||||
noncopyable_export.pyd: $(OBJ) noncopyable_export.obj
|
||||
$(LD) $(LDOPTS) $(OBJ) noncopyable_export.obj $(PYLIB) -o noncopyable_export.pyd
|
||||
|
||||
noncopyable_import.pyd: $(OBJ) noncopyable_import.obj
|
||||
$(LD) $(LDOPTS) $(OBJ) noncopyable_import.obj $(PYLIB) -o noncopyable_import.pyd
|
||||
|
||||
ivect.pyd: $(OBJ) ivect.obj
|
||||
$(LD) $(LDOPTS) $(OBJ) ivect.obj $(PYLIB) -o ivect.pyd
|
||||
|
||||
dvect.pyd: $(OBJ) dvect.obj
|
||||
$(LD) $(LDOPTS) $(OBJ) dvect.obj $(PYLIB) -o dvect.pyd
|
||||
|
||||
richcmp1.pyd: $(OBJ) richcmp1.obj
|
||||
$(LD) $(LDOPTS) $(OBJ) richcmp1.obj $(PYLIB) -o richcmp1.pyd
|
||||
|
||||
richcmp2.pyd: $(OBJ) richcmp2.obj
|
||||
$(LD) $(LDOPTS) $(OBJ) richcmp2.obj $(PYLIB) -o richcmp2.pyd
|
||||
|
||||
richcmp3.pyd: $(OBJ) richcmp3.obj
|
||||
$(LD) $(LDOPTS) $(OBJ) richcmp3.obj $(PYLIB) -o richcmp3.pyd
|
||||
|
||||
.cpp.obj:
|
||||
$(CPP) $(CPPOPTS) -c $*.cpp
|
||||
|
||||
test:
|
||||
$(PYEXE) comprehensive.py
|
||||
$(PYEXE) test_abstract.py
|
||||
$(PYEXE) test_getting_started1.py
|
||||
$(PYEXE) test_getting_started2.py
|
||||
$(PYEXE) test_simple_vector.py
|
||||
$(PYEXE) test_do_it_yourself_convts.py
|
||||
$(PYEXE) test_nested.py
|
||||
$(PYEXE) test_pickle1.py
|
||||
$(PYEXE) test_pickle2.py
|
||||
$(PYEXE) test_pickle3.py
|
||||
$(PYEXE) test_cross_module.py
|
||||
$(PYEXE) test_richcmp1.py
|
||||
$(PYEXE) test_richcmp2.py
|
||||
$(PYEXE) test_richcmp3.py
|
||||
|
||||
clean:
|
||||
-del *.obj
|
||||
-del *.lib
|
||||
-del *.exp
|
||||
-del *.idb
|
||||
-del *.pyd
|
||||
-del *.pyc
|
||||
|
||||
softlinks:
|
||||
python $(BOOST_UNIX)/libs/python/build/filemgr.py $(BOOST_UNIX) softlinks
|
||||
|
||||
unlink:
|
||||
python $(BOOST_UNIX)/libs/python/build/filemgr.py $(BOOST_UNIX) unlink
|
||||
|
||||
cp:
|
||||
python $(BOOST_UNIX)/libs/python/build/filemgr.py $(BOOST_UNIX) cp
|
||||
|
||||
rm:
|
||||
python $(BOOST_UNIX)/libs/python/build/filemgr.py $(BOOST_UNIX) rm
|
||||
|
||||
copy:
|
||||
$(PYEXE) $(BOOST_WIN)\libs\python\build\filemgr.py $(BOOST_WIN) copy
|
||||
|
||||
del:
|
||||
$(PYEXE) $(BOOST_WIN)\libs\python\build\filemgr.py $(BOOST_WIN) del
|
||||
@@ -1,2 +0,0 @@
|
||||
call "c:\program files\metrowerks\codewarrior\other metrowerks tools\command line tools\cwenv.bat"
|
||||
set MWWinx86LibraryFiles=MSL_All-DLL_x86.lib;gdi32.lib;user32.lib;kernel32.lib
|
||||
16
doc/PyConDC_2003/bpl.html
Executable file
@@ -0,0 +1,16 @@
|
||||
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.2//EN">
|
||||
|
||||
<html>
|
||||
<head>
|
||||
<meta name="generator" content=
|
||||
"HTML Tidy for Windows (vers 1st August 2002), see www.w3.org">
|
||||
<meta http-equiv="refresh" content="0; URL=http://www.boost-consulting.com/writing/bpl.html">
|
||||
|
||||
<title>Loading: “Building Hybrid Systems With Boost.Python”</title>
|
||||
</head>
|
||||
|
||||
<body>
|
||||
Loading...; if nothing happens, please go to <a href= "http://www.boost-consulting.com/writing/bpl.html">http://www.boost-consulting.com/writing/bpl.html</a>.
|
||||
</body>
|
||||
</html>
|
||||
|
||||
BIN
doc/PyConDC_2003/bpl.pdf
Executable file
1
doc/PyConDC_2003/bpl.txt
Normal file
@@ -0,0 +1 @@
|
||||
This file has been moved to http://www.boost-consulting.com/writing/bpl.txt.
|
||||
908
doc/PyConDC_2003/bpl_mods.txt
Normal file
@@ -0,0 +1,908 @@
|
||||
.. This is a comment. Note how any initial comments are moved by
|
||||
transforms to after the document title, subtitle, and docinfo.
|
||||
|
||||
.. Need intro and conclusion
|
||||
.. Exposing classes
|
||||
.. Constructors
|
||||
.. Overloading
|
||||
.. Properties and data members
|
||||
.. Inheritance
|
||||
.. Operators and Special Functions
|
||||
.. Virtual Functions
|
||||
.. Call Policies
|
||||
|
||||
++++++++++++++++++++++++++++++++++++++++++++++
|
||||
Introducing Boost.Python (Extended Abstract)
|
||||
++++++++++++++++++++++++++++++++++++++++++++++
|
||||
|
||||
|
||||
.. bibliographic fields (which also require a transform):
|
||||
|
||||
:Author: David Abrahams
|
||||
:Address: 45 Walnut Street
|
||||
Somerville, MA 02143
|
||||
:Contact: dave@boost-consulting.com
|
||||
:organization: `Boost Consulting`_
|
||||
:date: $Date$
|
||||
:status: This is a "work in progress"
|
||||
:version: 1
|
||||
:copyright: Copyright David Abrahams 2002. All rights reserved
|
||||
|
||||
:Dedication:
|
||||
|
||||
For my girlfriend, wife, and partner Luann
|
||||
|
||||
:abstract:
|
||||
|
||||
This paper describes the Boost.Python library, a system for
|
||||
C++/Python interoperability.
|
||||
|
||||
.. meta::
|
||||
:keywords: Boost,python,Boost.Python,C++
|
||||
:description lang=en: C++/Python interoperability with Boost.Python
|
||||
|
||||
.. contents:: Table of Contents
|
||||
.. section-numbering::
|
||||
|
||||
|
||||
.. _`Boost Consulting`: http://www.boost-consulting.com
|
||||
|
||||
==============
|
||||
Introduction
|
||||
==============
|
||||
|
||||
Python and C++ are in many ways as different as two languages could
|
||||
be: while C++ is usually compiled to machine-code, Python is
|
||||
interpreted. Python's dynamic type system is often cited as the
|
||||
foundation of its flexibility, while in C++ static typing is the
|
||||
cornerstone of its efficiency. C++ has an intricate and difficult
|
||||
meta-language to support compile-time polymorphism, while Python is
|
||||
a uniform language with convenient runtime polymorphism.
|
||||
|
||||
Yet for many programmers, these very differences mean that Python and
|
||||
C++ complement one another perfectly. Performance bottlenecks in
|
||||
Python programs can be rewritten in C++ for maximal speed, and
|
||||
authors of powerful C++ libraries choose Python as a middleware
|
||||
language for its flexible system integration capabilities.
|
||||
Furthermore, the surface differences mask some strong similarities:
|
||||
|
||||
* 'C'-family control structures (if, while, for...)
|
||||
|
||||
* Support for object-orientation, functional programming, and generic
|
||||
programming (these are both *multi-paradigm* programming languages.)
|
||||
|
||||
* Comprehensive operator overloading facilities, recognizing the
|
||||
importance of syntactic variability for readability and
|
||||
expressivity.
|
||||
|
||||
* High-level concepts such as collections and iterators.
|
||||
|
||||
* High-level encapsulation facilities (C++: namespaces, Python: modules)
|
||||
to support the design of re-usable libraries.
|
||||
|
||||
* Exception-handling for effective management of error conditions.
|
||||
|
||||
* C++ idioms in common use, such as handle/body classes and
|
||||
reference-counted smart pointers mirror Python reference semantics.
|
||||
|
||||
Python provides a rich 'C' API for writers of 'C' extension modules.
|
||||
Unfortunately, using this API directly for exposing C++ type and
|
||||
function interfaces to Python is much more tedious than it should be.
|
||||
This is mainly due to the limitations of the 'C' language. Compared to
|
||||
C++ and Python, 'C' has only very rudimentary abstraction facilities.
|
||||
Support for exception-handling is completely missing. One important
|
||||
undesirable consequence is that 'C' extension module writers are
|
||||
required to manually manage Python reference counts. Another unpleasant
|
||||
consequence is a very high degree of repetition of similar code in 'C'
|
||||
extension modules. Of course highly redundant code does not only cause
|
||||
frustration for the module writer, but is also very difficult to
|
||||
maintain.
|
||||
|
||||
The limitations of the 'C' API have lead to the development of a
|
||||
variety of wrapping systems. SWIG_ is probably the most popular package
|
||||
for the integration of C/C++ and Python. A more recent development is
|
||||
the SIP_ package, which is specifically designed for interfacing Python
|
||||
with the Qt_ graphical user interface library. Both SWIG and SIP
|
||||
introduce a new specialized language for defining the inter-language
|
||||
bindings. Of course being able to use a specialized language has
|
||||
advantages, but having to deal with three different languages (Python,
|
||||
C/C++ and the interface language) also introduces practical and mental
|
||||
difficulties. The CXX_ package demonstrates an interesting alternative.
|
||||
It shows that at least some parts of Python's 'C' API can be wrapped
|
||||
and presented through a much more user-friendly C++ interface. However,
|
||||
unlike SWIG and SIP, CXX does not include support for wrapping C++
|
||||
classes as new Python types. CXX is also no longer actively developed.
|
||||
|
||||
In some respects Boost.Python combines ideas from SWIG and SIP with
|
||||
ideas from CXX. Like SWIG and SIP, Boost.Python is a system for
|
||||
wrapping C++ classes as new Python "built-in" types, and C/C++
|
||||
functions as Python functions. Like CXX, Boost.Python presents Python's
|
||||
'C' API through a C++ interface. Boost.Python goes beyond the scope of
|
||||
other systems with the unique support for C++ virtual functions that
|
||||
are overrideable in Python, support for organizing extensions as Python
|
||||
packages with a central registry for inter-language type conversions,
|
||||
and a convenient mechanism for tying into Python's serialization engine
|
||||
(pickle). Importantly, all this is achieved without introducing a new
|
||||
syntax. Boost.Python leverages the power of C++ meta-programming
|
||||
techniques to introspect about the C++ type system, and presents a
|
||||
simple, IDL-like C++ interface for exposing C/C++ code in extension
|
||||
modules. Boost.Python is a pure C++ library, the inter-language
|
||||
bindings are defined in pure C++, and other than a C++ compiler only
|
||||
Python itself is required to get started with Boost.Python. Last but
|
||||
not least, Boost.Python is an unrestricted open source library. There
|
||||
are no strings attached even for commercial applications.
|
||||
|
||||
.. _SWIG: http://www.swig.org/
|
||||
.. _SIP: http://www.riverbankcomputing.co.uk/sip/index.php
|
||||
.. _Qt: http://www.trolltech.com/
|
||||
.. _CXX: http://cxx.sourceforge.net/
|
||||
|
||||
===========================
|
||||
Boost.Python Design Goals
|
||||
===========================
|
||||
|
||||
The primary goal of Boost.Python is to allow users to expose C++
|
||||
classes and functions to Python using nothing more than a C++
|
||||
compiler. In broad strokes, the user experience should be one of
|
||||
directly manipulating C++ objects from Python.
|
||||
|
||||
However, it's also important not to translate all interfaces *too*
|
||||
literally: the idioms of each language must be respected. For
|
||||
example, though C++ and Python both have an iterator concept, they are
|
||||
expressed very differently. Boost.Python has to be able to bridge the
|
||||
interface gap.
|
||||
|
||||
It must be possible to insulate Python users from crashes resulting
|
||||
from trivial misuses of C++ interfaces, such as accessing
|
||||
already-deleted objects. By the same token the library should
|
||||
insulate C++ users from low-level Python 'C' API, replacing
|
||||
error-prone 'C' interfaces like manual reference-count management and
|
||||
raw ``PyObject`` pointers with more-robust alternatives.
|
||||
|
||||
Support for component-based development is crucial, so that C++ types
|
||||
exposed in one extension module can be passed to functions exposed in
|
||||
another without loss of crucial information like C++ inheritance
|
||||
relationships.
|
||||
|
||||
Finally, all wrapping must be *non-intrusive*, without modifying or
|
||||
even seeing the original C++ source code. Existing C++ libraries have
|
||||
to be wrappable by third parties who only have access to header files
|
||||
and binaries.
|
||||
|
||||
==========================
|
||||
Hello Boost.Python World
|
||||
==========================
|
||||
|
||||
And now for a preview of Boost.Python, and how it improves on the raw
|
||||
facilities offered by Python. Here's a function we might want to
|
||||
expose::
|
||||
|
||||
char const* greet(unsigned x)
|
||||
{
|
||||
static char const* const msgs[] = { "hello", "Boost.Python", "world!" };
|
||||
|
||||
if (x > 2)
|
||||
throw std::range_error("greet: index out of range");
|
||||
|
||||
return msgs[x];
|
||||
}
|
||||
|
||||
To wrap this function in standard C++ using the Python 'C' API, we'd
|
||||
need something like this::
|
||||
|
||||
extern "C" // all Python interactions use 'C' linkage and calling convention
|
||||
{
|
||||
// Wrapper to handle argument/result conversion and checking
|
||||
PyObject* greet_wrap(PyObject* args, PyObject * keywords)
|
||||
{
|
||||
int x;
|
||||
if (PyArg_ParseTuple(args, "i", &x)) // extract/check arguments
|
||||
{
|
||||
char const* result = greet(x); // invoke wrapped function
|
||||
return PyString_FromString(result); // convert result to Python
|
||||
}
|
||||
return 0; // error occurred
|
||||
}
|
||||
|
||||
// Table of wrapped functions to be exposed by the module
|
||||
static PyMethodDef methods[] = {
|
||||
{ "greet", greet_wrap, METH_VARARGS, "return one of 3 parts of a greeting" }
|
||||
, { NULL, NULL, 0, NULL } // sentinel
|
||||
};
|
||||
|
||||
// module initialization function
|
||||
DL_EXPORT init_hello()
|
||||
{
|
||||
(void) Py_InitModule("hello", methods); // add the methods to the module
|
||||
}
|
||||
}
|
||||
|
||||
Now here's the wrapping code we'd use to expose it with Boost.Python::
|
||||
|
||||
#include <boost/python.hpp>
|
||||
using namespace boost::python;
|
||||
BOOST_PYTHON_MODULE(hello)
|
||||
{
|
||||
def("greet", greet, "return one of 3 parts of a greeting");
|
||||
}
|
||||
|
||||
and here it is in action::
|
||||
|
||||
>>> import hello
|
||||
>>> for x in range(3):
|
||||
... print hello.greet(x)
|
||||
...
|
||||
hello
|
||||
Boost.Python
|
||||
world!
|
||||
|
||||
Aside from the fact that the 'C' API version is much more verbose than
|
||||
the BPL one, it's worth noting that it doesn't handle a few things
|
||||
correctly:
|
||||
|
||||
* The original function accepts an unsigned integer, and the Python
|
||||
'C' API only gives us a way of extracting signed integers. The
|
||||
Boost.Python version will raise a Python exception if we try to pass
|
||||
a negative number to ``hello.greet``, but the other one will proceed
|
||||
to do whatever the C++ implementation does when converting an
|
||||
negative integer to unsigned (usually wrapping to some very large
|
||||
number), and pass the incorrect translation on to the wrapped
|
||||
function.
|
||||
|
||||
* That brings us to the second problem: if the C++ ``greet()``
|
||||
function is called with a number greater than 2, it will throw an
|
||||
exception. Typically, if a C++ exception propagates across the
|
||||
boundary with code generated by a 'C' compiler, it will cause a
|
||||
crash. As you can see in the first version, there's no C++
|
||||
scaffolding there to prevent this from happening. Functions wrapped
|
||||
by Boost.Python automatically include an exception-handling layer
|
||||
which protects Python users by translating unhandled C++ exceptions
|
||||
into a corresponding Python exception.
|
||||
|
||||
* A slightly more-subtle limitation is that the argument conversion
|
||||
used in the Python 'C' API case can only get that integer ``x`` in
|
||||
*one way*. PyArg_ParseTuple can't convert Python ``long`` objects
|
||||
(arbitrary-precision integers) which happen to fit in an ``unsigned
|
||||
int`` but not in a ``signed long``, nor will it ever handle a
|
||||
wrapped C++ class with a user-defined implicit ``operator unsigned
|
||||
int()`` conversion. The BPL's dynamic type conversion registry
|
||||
allows users to add arbitrary conversion methods.
|
||||
|
||||
==================
|
||||
Library Overview
|
||||
==================
|
||||
|
||||
This section outlines some of the library's major features. Except as
|
||||
neccessary to avoid confusion, details of library implementation are
|
||||
omitted.
|
||||
|
||||
-------------------------------------------
|
||||
The fundamental type-conversion mechanism
|
||||
-------------------------------------------
|
||||
|
||||
XXX This needs to be rewritten.
|
||||
|
||||
Every argument of every wrapped function requires some kind of
|
||||
extraction code to convert it from Python to C++. Likewise, the
|
||||
function return value has to be converted from C++ to Python.
|
||||
Appropriate Python exceptions must be raised if the conversion fails.
|
||||
Argument and return types are part of the function's type, and much of
|
||||
this tedium can be relieved if the wrapping system can extract that
|
||||
information through introspection.
|
||||
|
||||
Passing a wrapped C++ derived class instance to a C++ function
|
||||
accepting a pointer or reference to a base class requires knowledge of
|
||||
the inheritance relationship and how to translate the address of a base
|
||||
class into that of a derived class.
|
||||
|
||||
------------------
|
||||
Exposing Classes
|
||||
------------------
|
||||
|
||||
C++ classes and structs are exposed with a similarly-terse interface.
|
||||
Given::
|
||||
|
||||
struct World
|
||||
{
|
||||
void set(std::string msg) { this->msg = msg; }
|
||||
std::string greet() { return msg; }
|
||||
std::string msg;
|
||||
};
|
||||
|
||||
The following code will expose it in our extension module::
|
||||
|
||||
#include <boost/python.hpp>
|
||||
BOOST_PYTHON_MODULE(hello)
|
||||
{
|
||||
class_<World>("World")
|
||||
.def("greet", &World::greet)
|
||||
.def("set", &World::set)
|
||||
;
|
||||
}
|
||||
|
||||
Although this code has a certain pythonic familiarity, people
|
||||
sometimes find the syntax bit confusing because it doesn't look like
|
||||
most of the C++ code they're used to. All the same, this is just
|
||||
standard C++. Because of their flexible syntax and operator
|
||||
overloading, C++ and Python are great for defining domain-specific
|
||||
(sub)languages
|
||||
(DSLs), and that's what we've done in BPL. To break it down::
|
||||
|
||||
class_<World>("World")
|
||||
|
||||
constructs an unnamed object of type ``class_<World>`` and passes
|
||||
``"World"`` to its constructor. This creates a new-style Python class
|
||||
called ``World`` in the extension module, and associates it with the
|
||||
C++ type ``World`` in the BPL type conversion registry. We might have
|
||||
also written::
|
||||
|
||||
class_<World> w("World");
|
||||
|
||||
but that would've been more verbose, since we'd have to name ``w``
|
||||
again to invoke its ``def()`` member function::
|
||||
|
||||
w.def("greet", &World::greet)
|
||||
|
||||
There's nothing special about the location of the dot for member
|
||||
access in the original example: C++ allows any amount of whitespace on
|
||||
either side of a token, and placing the dot at the beginning of each
|
||||
line allows us to chain as many successive calls to member functions
|
||||
as we like with a uniform syntax. The other key fact that allows
|
||||
chaining is that ``class_<>`` member functions all return a reference
|
||||
to ``*this``.
|
||||
|
||||
So the example is equivalent to::
|
||||
|
||||
class_<World> w("World");
|
||||
w.def("greet", &World::greet);
|
||||
w.def("set", &World::set);
|
||||
|
||||
It's occasionally useful to be able to break down the components of a
|
||||
Boost.Python class wrapper in this way, but the rest of this paper
|
||||
will tend to stick to the terse syntax.
|
||||
|
||||
For completeness, here's the wrapped class in use:
|
||||
|
||||
>>> import hello
|
||||
>>> planet = hello.World()
|
||||
>>> planet.set('howdy')
|
||||
>>> planet.greet()
|
||||
'howdy'
|
||||
|
||||
Constructors
|
||||
============
|
||||
|
||||
Since our ``World`` class is just a plain ``struct``, it has an
|
||||
implicit no-argument (nullary) constructor. Boost.Python exposes the
|
||||
nullary constructor by default, which is why we were able to write:
|
||||
|
||||
>>> planet = hello.World()
|
||||
|
||||
However, well-designed classes in any language may require constructor
|
||||
arguments in order to establish their invariants. Unlike Python,
|
||||
where ``__init__`` is just a specially-named method, In C++
|
||||
constructors cannot be handled like ordinary member functions. In
|
||||
particular, we can't take their address: ``&World::World`` is an
|
||||
error. The library provides a different interface for specifying
|
||||
constructors. Given::
|
||||
|
||||
struct World
|
||||
{
|
||||
World(std::string msg); // added constructor
|
||||
...
|
||||
|
||||
we can modify our wrapping code as follows::
|
||||
|
||||
class_<World>("World", init<std::string>())
|
||||
...
|
||||
|
||||
of course, a C++ class may have additional constructors, and we can
|
||||
expose those as well by passing more instances of ``init<...>`` to
|
||||
``def()``::
|
||||
|
||||
class_<World>("World", init<std::string>())
|
||||
.def(init<double, double>())
|
||||
...
|
||||
|
||||
Boost.Python allows wrapped functions, member functions, and
|
||||
constructors to be overloaded to mirror C++ overloading.
|
||||
|
||||
Data Members and Properties
|
||||
===========================
|
||||
|
||||
Any publicly-accessible data members in a C++ class can be easily
|
||||
exposed as either ``readonly`` or ``readwrite`` attributes::
|
||||
|
||||
class_<World>("World", init<std::string>())
|
||||
.def_readonly("msg", &World::msg)
|
||||
...
|
||||
|
||||
and can be used directly in Python:
|
||||
|
||||
>>> planet = hello.World('howdy')
|
||||
>>> planet.msg
|
||||
'howdy'
|
||||
|
||||
This does *not* result in adding attributes to the ``World`` instance
|
||||
``__dict__``, which can result in substantial memory savings when
|
||||
wrapping large data structures. In fact, no instance ``__dict__``
|
||||
will be created at all unless attributes are explicitly added from
|
||||
Python. BPL owes this capability to the new Python 2.2 type system,
|
||||
in particular the descriptor interface and ``property`` type.
|
||||
|
||||
In C++, publicly-accessible data members are considered a sign of poor
|
||||
design because they break encapsulation, and style guides usually
|
||||
dictate the use of "getter" and "setter" functions instead. In
|
||||
Python, however, ``__getattr__``, ``__setattr__``, and since 2.2,
|
||||
``property`` mean that attribute access is just one more
|
||||
well-encapsulated syntactic tool at the programmer's disposal. BPL
|
||||
bridges this idiomatic gap by making Python ``property`` creation
|
||||
directly available to users. So if ``msg`` were private, we could
|
||||
still expose it as attribute in Python as follows::
|
||||
|
||||
class_<World>("World", init<std::string>())
|
||||
.add_property("msg", &World::greet, &World::set)
|
||||
...
|
||||
|
||||
The example above mirrors the familiar usage of properties in Python
|
||||
2.2+:
|
||||
|
||||
>>> class World(object):
|
||||
... __init__(self, msg):
|
||||
... self.__msg = msg
|
||||
... def greet(self):
|
||||
... return self.__msg
|
||||
... def set(self, msg):
|
||||
... self.__msg = msg
|
||||
... msg = property(greet, set)
|
||||
|
||||
Operators and Special Functions
|
||||
===============================
|
||||
|
||||
The ability to write arithmetic operators for user-defined types that
|
||||
C++ and Python both allow the definition of has been a major factor in
|
||||
the popularity of both languages for scientific computing. The
|
||||
success of packages like NumPy attests to the power of exposing
|
||||
operators in extension modules. In this example we'll wrap a class
|
||||
representing a position in a large file::
|
||||
|
||||
class FilePos { /*...*/ };
|
||||
|
||||
// Linear offset
|
||||
FilePos operator+(FilePos, int);
|
||||
FilePos operator+(int, FilePos);
|
||||
FilePos operator-(FilePos, int);
|
||||
|
||||
// Distance between two FilePos objects
|
||||
int operator-(FilePos, FilePos);
|
||||
|
||||
// Offset with assignment
|
||||
FilePos& operator+=(FilePos&, int);
|
||||
FilePos& operator-=(FilePos&, int);
|
||||
|
||||
// Comparison
|
||||
bool operator<(FilePos, FilePos);
|
||||
|
||||
The wrapping code looks like this::
|
||||
|
||||
class_<FilePos>("FilePos")
|
||||
.def(self + int()) // __add__
|
||||
.def(int() + self) // __radd__
|
||||
.def(self - int()) // __sub__
|
||||
|
||||
.def(self - self) // __sub__
|
||||
|
||||
.def(self += int()) // __iadd__
|
||||
.def(self -= int()) // __isub__
|
||||
|
||||
.def(self < self); // __lt__
|
||||
;
|
||||
|
||||
The magic is performed using a simplified application of "expression
|
||||
templates" [VELD1995]_, a technique originally developed by for
|
||||
optimization of high-performance matrix algebra expressions. The
|
||||
essence is that instead of performing the computation immediately,
|
||||
operators are overloaded to construct a type *representing* the
|
||||
computation. In matrix algebra, dramatic optimizations are often
|
||||
available when the structure of an entire expression can be taken into
|
||||
account, rather than processing each operation "greedily".
|
||||
Boost.Python uses the same technique to build an appropriate Python
|
||||
callable object based on an expression involving ``self``, which is
|
||||
then added to the class.
|
||||
|
||||
Inheritance
|
||||
===========
|
||||
|
||||
C++ inheritance relationships can be represented to Boost.Python by adding
|
||||
an optional ``bases<...>`` argument to the ``class_<...>`` template
|
||||
parameter list as follows::
|
||||
|
||||
class_<Derived, bases<Base1,Base2> >("Derived")
|
||||
...
|
||||
|
||||
This has two effects:
|
||||
|
||||
1. When the ``class_<...>`` is created, Python type objects
|
||||
corresponding to ``Base1`` and ``Base2`` are looked up in the BPL
|
||||
registry, and are used as bases for the new Python ``Derived`` type
|
||||
object [#mi]_, so methods exposed for the Python ``Base1`` and
|
||||
``Base2`` types are automatically members of the ``Derived`` type.
|
||||
Because the registry is global, this works correctly even if
|
||||
``Derived`` is exposed in a different module from either of its
|
||||
bases.
|
||||
|
||||
2. C++ conversions from ``Derived`` to its bases are added to the
|
||||
Boost.Python registry. Thus wrapped C++ methods expecting (a
|
||||
pointer or reference to) an object of either base type can be
|
||||
called with an object wrapping a ``Derived`` instance. Wrapped
|
||||
member functions of class ``T`` are treated as though they have an
|
||||
implicit first argument of ``T&``, so these conversions are
|
||||
neccessary to allow the base class methods to be called for derived
|
||||
objects.
|
||||
|
||||
Of course it's possible to derive new Python classes from wrapped C++
|
||||
class instances. Because Boost.Python uses the new-style class
|
||||
system, that works very much as for the Python built-in types. There
|
||||
is one significant detail in which it differs: the built-in types
|
||||
generally establish their invariants in their ``__new__`` function, so
|
||||
that derived classes do not need to call ``__init__`` on the base
|
||||
class before invoking its methods :
|
||||
|
||||
>>> class L(list):
|
||||
... def __init__(self):
|
||||
... pass
|
||||
...
|
||||
>>> L().reverse()
|
||||
>>>
|
||||
|
||||
Because C++ object construction is a one-step operation, C++ instance
|
||||
data cannot be constructed until the arguments are available, in the
|
||||
``__init__`` function:
|
||||
|
||||
>>> class D(SomeBPLClass):
|
||||
... def __init__(self):
|
||||
... pass
|
||||
...
|
||||
>>> D().some_bpl_method()
|
||||
Traceback (most recent call last):
|
||||
File "<stdin>", line 1, in ?
|
||||
TypeError: bad argument type for built-in operation
|
||||
|
||||
This happened because Boost.Python couldn't find instance data of type
|
||||
``SomeBPLClass`` within the ``D`` instance; ``D``'s ``__init__``
|
||||
function masked construction of the base class. It could be corrected
|
||||
by either removing ``D``'s ``__init__`` function or having it call
|
||||
``SomeBPLClass.__init__(...)`` explicitly.
|
||||
|
||||
Virtual Functions
|
||||
=================
|
||||
|
||||
Deriving new types in Python from extension classes is not very
|
||||
interesting unless they can be used polymorphically from C++. In
|
||||
other words, Python method implementations should appear to override
|
||||
the implementation of C++ virtual functions when called *through base
|
||||
class pointers/references from C++*. Since the only way to alter the
|
||||
behavior of a virtual function is to override it in a derived class,
|
||||
the user must build a special derived class to dispatch a polymorphic
|
||||
class' virtual functions::
|
||||
|
||||
//
|
||||
// interface to wrap:
|
||||
//
|
||||
class Base
|
||||
{
|
||||
public:
|
||||
virtual int f(std::string x) { return 42; }
|
||||
virtual ~Base();
|
||||
};
|
||||
|
||||
int calls_f(Base const& b, std::string x) { return b.f(x); }
|
||||
|
||||
//
|
||||
// Wrapping Code
|
||||
//
|
||||
|
||||
// Dispatcher class
|
||||
struct BaseWrap : Base
|
||||
{
|
||||
// Store a pointer to the Python object
|
||||
BaseWrap(PyObject* self_) : self(self_) {}
|
||||
PyObject* self;
|
||||
|
||||
// Default implementation, for when f is not overridden
|
||||
int f_default(std::string x) { return this->Base::f(x); }
|
||||
// Dispatch implementation
|
||||
int f(std::string x) { return call_method<int>(self, "f", x); }
|
||||
};
|
||||
|
||||
...
|
||||
def("calls_f", calls_f);
|
||||
class_<Base, BaseWrap>("Base")
|
||||
.def("f", &Base::f, &BaseWrap::f_default)
|
||||
;
|
||||
|
||||
Now here's some Python code which demonstrates:
|
||||
|
||||
>>> class Derived(Base):
|
||||
... def f(self, s):
|
||||
... return len(s)
|
||||
...
|
||||
>>> calls_f(Base(), 'foo')
|
||||
42
|
||||
>>> calls_f(Derived(), 'forty-two')
|
||||
9
|
||||
|
||||
Things to notice about the dispatcher class:
|
||||
|
||||
* The key element which allows overriding in Python is the
|
||||
``call_method`` invocation, which uses the same global type
|
||||
conversion registry as the C++ function wrapping does to convert its
|
||||
arguments from C++ to Python and its return type from Python to C++.
|
||||
|
||||
* Any constructor signatures you wish to wrap must be replicated with
|
||||
an initial ``PyObject*`` argument
|
||||
|
||||
* The dispatcher must store this argument so that it can be used to
|
||||
invoke ``call_method``
|
||||
|
||||
* The ``f_default`` member function is needed when the function being
|
||||
exposed is not pure virtual; there's no other way ``Base::f`` can be
|
||||
called on an object of type ``BaseWrap``, since it overrides ``f``.
|
||||
|
||||
Admittedly, this formula is tedious to repeat, especially on a project
|
||||
with many polymorphic classes; that it is neccessary reflects
|
||||
limitations in C++'s compile-time reflection capabilities. Several
|
||||
efforts are underway to write front-ends for Boost.Python which can
|
||||
generate these dispatchers (and other wrapping code) automatically.
|
||||
If these are successful it will mark a move away from wrapping
|
||||
everything directly in pure C++ for many of our users.
|
||||
|
||||
---------------
|
||||
Serialization
|
||||
---------------
|
||||
|
||||
*Serialization* is the process of converting objects in memory to a
|
||||
form that can be stored on disk or sent over a network connection. The
|
||||
serialized object (most often a plain string) can be retrieved and
|
||||
converted back to the original object. A good serialization system will
|
||||
automatically convert entire object hierarchies. Python's standard
|
||||
``pickle`` module is such a system. It leverages the language's strong
|
||||
runtime introspection facilities for serializing practically arbitrary
|
||||
user-defined objects. With a few simple and unintrusive provisions this
|
||||
powerful machinery can be extended to also work for wrapped C++ objects.
|
||||
Here is an example::
|
||||
|
||||
#include <string>
|
||||
|
||||
struct World
|
||||
{
|
||||
World(std::string a_msg) : msg(a_msg) {}
|
||||
std::string greet() const { return msg; }
|
||||
std::string msg;
|
||||
};
|
||||
|
||||
#include <boost/python.hpp>
|
||||
using namespace boost::python;
|
||||
|
||||
struct World_picklers : pickle_suite
|
||||
{
|
||||
static tuple
|
||||
getinitargs(World const& w) { return make_tuple(w.greet()); }
|
||||
};
|
||||
|
||||
BOOST_PYTHON_MODULE(hello)
|
||||
{
|
||||
class_<World>("World", init<std::string>())
|
||||
.def("greet", &World::greet)
|
||||
.def_pickle(World_picklers())
|
||||
;
|
||||
}
|
||||
|
||||
Now let's create a ``World`` object and put it to rest on disk::
|
||||
|
||||
>>> import hello
|
||||
>>> import pickle
|
||||
>>> a_world = hello.World("howdy")
|
||||
>>> pickle.dump(a_world, open("my_world", "w"))
|
||||
|
||||
In a potentially *different script* on a potentially *different
|
||||
computer* with a potentially *different operating system*::
|
||||
|
||||
>>> import pickle
|
||||
>>> resurrected_world = pickle.load(open("my_world", "r"))
|
||||
>>> resurrected_world.greet()
|
||||
'howdy'
|
||||
|
||||
Of course the ``cPickle`` module can also be used for faster
|
||||
processing.
|
||||
|
||||
Boost.Python's ``pickle_suite`` fully supports the ``pickle`` protocol
|
||||
defined in the standard Python documentation. There is a one-to-one
|
||||
correspondence between the standard pickling methods (``__getinitargs__``,
|
||||
``__getstate__``, ``__setstate__``) and the functions defined by the
|
||||
user in the class derived from ``pickle_suite`` (``getinitargs``,
|
||||
``getstate``, ``setstate``). The ``class_::def_pickle()`` member function
|
||||
is used to establish the Python bindings for all user-defined functions
|
||||
simultaneously. Correct signatures for these functions are enforced at
|
||||
compile time. Non-sensical combinations of the three pickle functions
|
||||
are also rejected at compile time. These measures are designed to
|
||||
help the user in avoiding obvious errors.
|
||||
|
||||
Enabling serialization of more complex C++ objects requires a little
|
||||
more work than is shown in the example above. Fortunately the
|
||||
``object`` interface (see next section) greatly helps in keeping the
|
||||
code manageable.
|
||||
|
||||
------------------
|
||||
Object interface
|
||||
------------------
|
||||
|
||||
Experienced extension module authors will be familiar with the 'C' view
|
||||
of Python objects, the ubiquitous ``PyObject*``. Most if not all Python
|
||||
'C' API functions involve ``PyObject*`` as arguments or return type. A
|
||||
major complication is the raw reference counting interface presented to
|
||||
the 'C' programmer. E.g. some API functions return *new references* and
|
||||
others return *borrowed references*. It is up to the extension module
|
||||
writer to properly increment and decrement reference counts. This
|
||||
quickly becomes cumbersome and error prone, especially if there are
|
||||
multiple execution paths.
|
||||
|
||||
Boost.Python provides a type ``object`` which is essentially a high
|
||||
level wrapper around ``PyObject*``. ``object`` automates reference
|
||||
counting as much as possible. It also provides the facilities for
|
||||
converting arbitrary C++ types to Python objects and vice versa.
|
||||
This significantly reduces the learning effort for prospective
|
||||
extension module writers.
|
||||
|
||||
Creating an ``object`` from any other type is extremely simple::
|
||||
|
||||
object o(3);
|
||||
|
||||
``object`` has templated interactions with all other types, with
|
||||
automatic to-python conversions. It happens so naturally that it's
|
||||
easily overlooked.
|
||||
|
||||
The ``extract<T>`` class template can be used to convert Python objects
|
||||
to C++ types::
|
||||
|
||||
double x = extract<double>(o);
|
||||
|
||||
All registered user-defined conversions are automatically accessible
|
||||
through the ``object`` interface. With reference to the ``World`` class
|
||||
defined in previous examples::
|
||||
|
||||
object as_python_object(World("howdy"));
|
||||
World back_as_c_plus_plus_object = extract<World>(as_python_object);
|
||||
|
||||
If a C++ type cannot be converted to a Python object an appropriate
|
||||
exception is thrown at runtime. Similarly, an appropriate exception is
|
||||
thrown if a C++ type cannot be extracted from a Python object.
|
||||
``extract<T>`` provides facilities for avoiding exceptions if this is
|
||||
desired.
|
||||
|
||||
The ``object::attr()`` member function is available for accessing
|
||||
and manipulating attributes of Python objects. For example::
|
||||
|
||||
object planet(World());
|
||||
planet.attr("set")("howdy");
|
||||
|
||||
``planet.attr("set")`` returns a callable ``object``. ``"howdy"`` is
|
||||
converted to a Python string object which is then passed as an argument
|
||||
to the ``set`` method.
|
||||
|
||||
The ``object`` type is accompanied by a set of derived types
|
||||
that mirror the Python built-in types such as ``list``, ``dict``,
|
||||
``tuple``, etc. as much as possible. This enables convenient
|
||||
manipulation of these high-level types from C++::
|
||||
|
||||
dict d;
|
||||
d["some"] = "thing";
|
||||
d["lucky_number"] = 13;
|
||||
list l = d.keys();
|
||||
|
||||
This almost looks and works like regular Python code, but it is pure C++.
|
||||
|
||||
=================
|
||||
Thinking hybrid
|
||||
=================
|
||||
|
||||
For many applications runtime performance considerations are very
|
||||
important. This is particularly true for most scientific applications.
|
||||
Often the performance considerations dictate the use of a compiled
|
||||
language for the core algorithms. Traditionally the decision to use a
|
||||
particular programming language is an exclusive one. Because of the
|
||||
practical and mental difficulties of combining different languages many
|
||||
systems are written in just one language. This is quite unfortunate
|
||||
because the price payed for runtime performance is typically a
|
||||
significant overhead due to static typing. For example, our experience
|
||||
shows that developing maintainable C++ code is typically much more
|
||||
time-consuming and requires much more hard-earned working experience
|
||||
than developing useful Python code. A related observation is that many
|
||||
compiled packages are augmented by some type of rudimentary scripting
|
||||
layer. These ad hoc solutions clearly show that many times a compiled
|
||||
language alone does not get the job done. On the other hand it is also
|
||||
clear that a pure Python implementation is too slow for numerically
|
||||
intensive production code.
|
||||
|
||||
Boost.Python enables us to *think hybrid* when developing new
|
||||
applications. Python can be used for rapidly prototyping a
|
||||
new application. Python's ease of use and the large pool of standard
|
||||
libraries give us a head start on the way to a first working system. If
|
||||
necessary, the working procedure can be used to discover the
|
||||
rate-limiting algorithms. To maximize performance these can be
|
||||
reimplemented in C++, together with the Boost.Python bindings needed to
|
||||
tie them back into the existing higher-level procedure.
|
||||
|
||||
Of course, this *top-down* approach is less attractive if it is clear
|
||||
from the start that many algorithms will eventually have to be
|
||||
implemented in a compiled language. Fortunately Boost.Python also
|
||||
enables us to pursue a *bottom-up* approach. We have used this approach
|
||||
very successfully in the development of a toolbox for scientific
|
||||
applications (scitbx) that we will describe elsewhere. The toolbox
|
||||
started out mainly as a library of C++ classes with Boost.Python
|
||||
bindings, and for a while the growth was mainly concentrated on the C++
|
||||
parts. However, as the toolbox is becoming more complete, more and more
|
||||
newly added functionality can be implemented in Python. We expect this
|
||||
trend to continue, as illustrated qualitatively in this figure:
|
||||
|
||||
.. image:: python_cpp_mix.png
|
||||
|
||||
This figure shows the ratio of newly added C++ and Python code over
|
||||
time as new algorithms are implemented. We expect this ratio to level
|
||||
out near 70% Python. The increasing ability to solve new problems
|
||||
mostly with the easy-to-use Python language rather than a necessarily
|
||||
more arcane statically typed language is the return on the investment
|
||||
of learning how to use Boost.Python. The ability to solve some problems
|
||||
entirely using only Python will enable a larger group of people to
|
||||
participate in the rapid development of new applications.
|
||||
|
||||
=============
|
||||
Conclusions
|
||||
=============
|
||||
|
||||
The examples in this paper illustrate that Boost.Python enables
|
||||
seamless interoperability between C++ and Python. Importantly, this is
|
||||
achieved without introducing a third syntax: the Python/C++ interface
|
||||
definitions are written in pure C++. This avoids any problems with
|
||||
parsing the C++ code to be interfaced to Python, yet the interface
|
||||
definitions are concise and maintainable. Freed from most of the
|
||||
development-time penalties of crossing a language boundary, software
|
||||
designers can take full advantage of two rich and complimentary
|
||||
language environments. In practice it turns out that some things are
|
||||
very difficult to do with pure Python/C (e.g. an efficient array
|
||||
library with an intuitive interface in the compiled language) and
|
||||
others are very difficult to do with pure C++ (e.g. serialization).
|
||||
If one has the luxury of being able to design a software system as a
|
||||
hybrid system from the ground up there are many new ways of avoiding
|
||||
road blocks in one language or the other.
|
||||
|
||||
.. I'm not ready to give up on all of this quite yet
|
||||
|
||||
.. Perhaps one day we'll have a language with the simplicity and
|
||||
expressive power of Python and the compile-time muscle of C++. Being
|
||||
able to take advantage of all of these facilities without paying the
|
||||
mental and development-time penalties of crossing a language barrier
|
||||
would bring enormous benefits. Until then, interoperability tools
|
||||
like Boost.Python can help lower the barrier and make the benefits of
|
||||
both languages more accessible to both communities.
|
||||
|
||||
===========
|
||||
Footnotes
|
||||
===========
|
||||
|
||||
.. [#mi] For hard-core new-style class/extension module writers it is
|
||||
worth noting that the normal requirement that all extension classes
|
||||
with data form a layout-compatible single-inheritance chain is
|
||||
lifted for Boost.Python extension classes. Clearly, either
|
||||
``Base1`` or ``Base2`` has to occupy a different offset in the
|
||||
``Derived`` class instance. This is possible because the wrapped
|
||||
part of BPL extension class instances is never assumed to have a
|
||||
fixed offset within the wrapper.
|
||||
|
||||
===========
|
||||
Citations
|
||||
===========
|
||||
|
||||
.. [VELD1995] T. Veldhuizen, "Expression Templates," C++ Report,
|
||||
Vol. 7 No. 5 June 1995, pp. 26-31.
|
||||
http://osl.iu.edu/~tveldhui/papers/Expression-Templates/exprtmpl.html
|
||||
188
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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font-family: sans-serif ;
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font-style: oblique }
|
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|
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span.option-argument {
|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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doc/PyConDC_2003/python_cpp_mix.jpg
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doc/PyConDC_2003/python_cpp_mix.png
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|
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<html>
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|
||||
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|
||||
|
||||
<title>Building an Extension Module</title>
|
||||
<title>Boost.Python - Building and Testing</title>
|
||||
</head>
|
||||
|
||||
<div>
|
||||
<h1><img width="277" height="86" align="center" src=
|
||||
"../../../c++boost.gif" alt="c++boost.gif (8819 bytes)">Building an
|
||||
Extension Module</h1>
|
||||
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|
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|
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|
||||
<h3><a href="../../../index.htm"><img height="86" width="277" alt=
|
||||
"C++ Boost" src="../../../boost.png" border="0"></a></h3>
|
||||
</td>
|
||||
|
||||
<h2>Building Boost.Python</h2>
|
||||
<td valign="top">
|
||||
<h1 align="center"><a href="index.html">Boost.Python</a></h1>
|
||||
|
||||
<p>Every Boost.Python extension module must be linked with the
|
||||
<code>boost_python</code> shared library. To build
|
||||
<code>boost_python</code>, use <a
|
||||
href="../../../tools/build/index.html">Boost.Build</a> in the
|
||||
usual way from the <code>libs/python/build</code> subdirectory
|
||||
of your boost installation (if you have already built boost from
|
||||
the top level this may have no effect, since the work is already
|
||||
done).
|
||||
<h2 align="center">Building and Testing</h2>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
<hr>
|
||||
|
||||
<h3>Configuration</h3>
|
||||
You may need to configure the following variables to point Boost.Build at your Python installation:
|
||||
<h2>Contents</h2>
|
||||
|
||||
<dl class="Reference">
|
||||
<dt><a href="#requirements">Requirements</a></dt>
|
||||
|
||||
<dt><a href="#building">Building Boost.Python</a></dt>
|
||||
|
||||
<dd>
|
||||
<dl class="index">
|
||||
<dt><a href="#configuration">Configuration</a></dt>
|
||||
|
||||
<dt><a href="#cygwin_configuration">Configuration for Cygwin GCC
|
||||
from a Windows prompt</a></dt>
|
||||
|
||||
<dt><a href="#results">Results</a></dt>
|
||||
|
||||
<dt><a href="#cygwin">Notes for Cygwin GCC Users</a></dt>
|
||||
|
||||
<dt><a href="#mingw">Notes for MinGW (and Cygwin with -mno-cygwin)
|
||||
GCC Users</a></dt>
|
||||
|
||||
<dt><a href="#testing">Testing</a></dt>
|
||||
</dl>
|
||||
</dd>
|
||||
|
||||
<dt><a href="#building_ext">Building your Extension Module</a></dt>
|
||||
|
||||
<dt><a href="#variants">Build Variants</a></dt>
|
||||
|
||||
<dt><a href="#VisualStudio">Building Using the Microsoft Visual Studio
|
||||
IDE</a></dt>
|
||||
</dl>
|
||||
<hr>
|
||||
|
||||
<h2><a name="requirements">Requirements</a></h2>
|
||||
<b>Boost.Python</b> version 2 requires <a href=
|
||||
"http://www.python.org/2.2">Python 2.2</a> <i>or <a href=
|
||||
"http://www.python.org">newer</a></i>. An unsupported archive of
|
||||
Boost.Python version 1, which works with versions of Python since 1.5.2,
|
||||
is available <a href="../build/python_v1.zip">here</a>.
|
||||
|
||||
<h2><a name="building">Building Boost.Python</a></h2>
|
||||
|
||||
<p>Normally, Boost.Python extension modules must be linked with the
|
||||
<code>boost_python</code> shared library. In special circumstances you
|
||||
may want to link to a static version of the <code>boost_python</code>
|
||||
library, but if multiple Boost.Python extension modules are used
|
||||
together, it will prevent sharing of types across extension modules, and
|
||||
consume extra code space. To build <code>boost_python</code>, use <a
|
||||
href="../../../tools/build/v1/build_system.htm">Boost.Build</a> in the
|
||||
usual way from the <code>libs/python/build</code> subdirectory of your
|
||||
boost installation (if you have already built boost from the top level
|
||||
this may have no effect, since the work is already done).</p>
|
||||
|
||||
<h3><a name="configuration">Basic Configuration</a></h3>
|
||||
You may need to configure the following variables to point Boost.Build at
|
||||
your Python installation:
|
||||
|
||||
<table border="1" summary="build configuration variables">
|
||||
<tr>
|
||||
<th>Variable Name</th>
|
||||
|
||||
<th>Semantics</th>
|
||||
|
||||
<th>Default</th>
|
||||
|
||||
<th>Notes</th>
|
||||
</tr>
|
||||
|
||||
<tr>
|
||||
<td><code>PYTHON_ROOT</code></td>
|
||||
|
||||
<td>The root directory of your Python installation</td>
|
||||
|
||||
<table border="1">
|
||||
<tr><th>Variable Name <th>Semantics <th>Default <th>Notes
|
||||
<tr>
|
||||
<td><code>PYTHON_ROOT</code>
|
||||
<td>The root directory of your Python installation
|
||||
<td>Windows: <code>c:/tools/python</code>
|
||||
Unix: <code>/usr/local</code>
|
||||
<td>On Unix, this is the <code>--with-prefix=</code> directory
|
||||
used to configure Python
|
||||
Unix: <code>/usr/local</code></td>
|
||||
|
||||
<td>On Unix, this is the <code>--with-prefix=</code> directory used
|
||||
to configure Python</td>
|
||||
</tr>
|
||||
|
||||
<tr>
|
||||
<td><code>PYTHON_VERSION</code></td>
|
||||
|
||||
<td>The The 2-part python Major.Minor version number</td>
|
||||
|
||||
<td><code>2.2</code></td>
|
||||
|
||||
<tr>
|
||||
<td><code>PYTHON_VERSION</code>
|
||||
<td>The The 2-part python Major.Minor version number
|
||||
<td>Windows: <code>2.1</code>
|
||||
Unix: <code>1.5</code>
|
||||
<td>Be sure not to include a third number, e.g. <b>not</b>
|
||||
"<code>2.2.1</code>", even if that's the version you
|
||||
have.
|
||||
"<code>2.2.1</code>", even if that's the version you have.</td>
|
||||
</tr>
|
||||
|
||||
<tr>
|
||||
<td><code>PYTHON_INCLUDES</code>
|
||||
<td>path to Python <code>#include</code> directories
|
||||
<td>Autoconfigured from <code>PYTHON_ROOT</code>
|
||||
<tr>
|
||||
<td><code>PYTHON_INCLUDES</code></td>
|
||||
|
||||
<tr>
|
||||
<td><code>PYTHON_LIB_PATH</code>
|
||||
<td>path to Python library object.
|
||||
<td>Autoconfigured from <code>PYTHON_ROOT</code>
|
||||
<td>path to Python <code>#include</code> directories</td>
|
||||
|
||||
<tr>
|
||||
<td><code>PYTHON_STDLIB_PATH</code>
|
||||
<td>path to Python standard library modules
|
||||
<td>Autoconfigured from <code>PYTHON_ROOT</code>
|
||||
<td>Autoconfigured from <code>PYTHON_ROOT</code>. Try the default
|
||||
before attempting to set it yourself.</td>
|
||||
</tr>
|
||||
|
||||
<tr>
|
||||
<td><code>CYGWIN_ROOT</code>
|
||||
<td>path to the user's Cygwin installation
|
||||
<td>
|
||||
<td><a href="http://www.cygwin.com">Cygwin</a> only. This and the following two settings are
|
||||
useful when building with multiple toolsets on Windows, since
|
||||
Cygwin requires a different build of Python.
|
||||
<tr>
|
||||
<td><code>PYTHON_LIB_PATH</code></td>
|
||||
|
||||
<tr>
|
||||
<td><code>GCC_PYTHON_ROOT</code>
|
||||
<td>path to the user's Cygwin Python installation
|
||||
<td><code>$(CYGWIN_ROOT)/usr/local</code>
|
||||
<td><a href="http://www.cygwin.com">Cygwin</a> only
|
||||
<td>path to Python library object.</td>
|
||||
|
||||
<tr>
|
||||
<td><code>GCC_DEBUG_PYTHON_ROOT</code>
|
||||
<td>path to the user's Cygwin <code><a
|
||||
href="#variants">pydebug</a></code> build
|
||||
<td><code>$(CYGWIN_ROOT)/usr/local/pydebug</code>
|
||||
<td><a href="http://www.cygwin.com">Cygwin</a> only
|
||||
<td>Autoconfigured from <code>PYTHON_ROOT</code>. Try the default
|
||||
before attempting to set it yourself.</td>
|
||||
</tr>
|
||||
</table>
|
||||
|
||||
</table>
|
||||
<h3><a name="cygwin_configuration">Configuration for Cygwin GCC from a
|
||||
Windows prompt</a></h3>
|
||||
The following settings may be useful when building with <a href=
|
||||
"http://www.cygwin.com">Cygwin</a> GCC (not MinGW) from a Windows command
|
||||
shell using a Windows build of <code>bjam</code>. <b>If
|
||||
"<code>bjam -v</code>" does not report "<code>OS=NT</code>", these
|
||||
settings do not apply to you</b>; you should use the <a href=
|
||||
"#configuration">normal configuration</a> variables instead. They are
|
||||
only useful when building and testing with multiple toolsets on Windows
|
||||
using a single build command, since Cygwin GCC requires a different build
|
||||
of Python.
|
||||
|
||||
<h3>Results</h3>
|
||||
<p>The build process will create a
|
||||
<code>libs/python/build/bin-stage</code> subdirectory of the
|
||||
boost root (or of <code>$(ALL_LOCATE_TARGET)</code>,
|
||||
if you have set that variable), containing the built
|
||||
libraries. The libraries are actually built to unique
|
||||
directories for each toolset and variant elsewhere in the
|
||||
filesystem, and copied to the
|
||||
<code>bin-stage</code> directory as a convenience, so if you
|
||||
build with multiple toolsets at once, the product of later
|
||||
toolsets will overwrite that of earlier toolsets in
|
||||
<code>bin-stage</code>.
|
||||
<table border="1" summary=
|
||||
"Cygwin GCC under NT build configuration variables">
|
||||
<tr>
|
||||
<th>Variable Name</th>
|
||||
|
||||
<h3>Testing</h3>
|
||||
<p>To build and test Boost.Python from within the
|
||||
<code>libs/python/build</code> directory, invoke
|
||||
<blockquote>
|
||||
<th>Semantics</th>
|
||||
|
||||
<th>Default</th>
|
||||
</tr>
|
||||
|
||||
<tr>
|
||||
<td><code>CYGWIN_PYTHON_[DEBUG_]VERSION</code></td>
|
||||
|
||||
<td>The version of python being used under Cygwin.</td>
|
||||
|
||||
<td>$(PYTHON_VERSION)</td>
|
||||
</tr>
|
||||
|
||||
<tr>
|
||||
<td><code>CYGWIN_PYTHON_[DEBUG_]ROOT</code></td>
|
||||
|
||||
<td>unix-style path containing the <code>include/</code> directory
|
||||
containing
|
||||
<code>python$(CYGWIN_PYTHON_[DEBUG_]VERSION)/python.h</code>.</td>
|
||||
|
||||
<td>$(PYTHON_ROOT)</td>
|
||||
</tr>
|
||||
|
||||
<tr>
|
||||
<td><code>CYGWIN_PYTHON_[DEBUG_]LIB_PATH</code></td>
|
||||
|
||||
<td>path containing the user's Cygwin Python import lib
|
||||
<code>libpython$(CYGWIN_PYTHON_[DEBUG_]VERSION).dll.a</code></td>
|
||||
|
||||
<td>Autoconfigured from <code>CYGWIN_PYTHON_ROOT</code></td>
|
||||
</tr>
|
||||
|
||||
<tr>
|
||||
<td><code>CYGWIN_PYTHON_[DEBUG_]DLL_PATH</code></td>
|
||||
|
||||
<td>path containing the user's Cygwin Python dll
|
||||
(<code>libpython$(CYGWIN_PYTHON_[DEBUG_]VERSION).dll</code>)</td>
|
||||
|
||||
<td><code>/bin</code></td>
|
||||
</tr>
|
||||
</table>
|
||||
|
||||
<h3><a name="cygwin">Notes for Cygwin GCC Users</a></h3>
|
||||
|
||||
<p>If you are using Cygwin GCC to build extension modules, you must use a
|
||||
Cygwin build of Python. The regular Win32 Python installation that you
|
||||
can download from <a href="http://www.python.org">python.org</a> will not
|
||||
work with your compiler because the dynamic linking conventions are
|
||||
different (you can use <a href="http://www.mingw.org/">MinGW</a> GCC if
|
||||
you want to build extension modules which are compatible with a stock
|
||||
Win32 Python). The Cygwin installer may be able to install an appropriate
|
||||
version of Python, or you can follow the traditional <a href=
|
||||
"http://www.python.org/download/download_source.html">Unix installation
|
||||
process</a> to build Python from source.</p>
|
||||
|
||||
<p>The special build configuration variables listed <a href=
|
||||
"#cygwin_configuration">above</a> make it possible to use a regular Win32
|
||||
build of bjam to build and test Boost.Python and Boost.Python extensions
|
||||
using Cygwin GCC and targeting a Cygwin build of Python.</p>
|
||||
|
||||
<h3><a name="mingw">Notes for MinGW (and Cygwin with -mno-cygwin) GCC
|
||||
Users</a></h3>
|
||||
|
||||
<p>You will need to create a MinGW-compatible version of the Python
|
||||
library; the one shipped with Python will only work with a
|
||||
Microsoft-compatible linker. Follow the instructions in the
|
||||
"Non-Microsoft" section of the "Building Extensions: Tips And Tricks"
|
||||
chapter in <a href=
|
||||
"http://www.python.org/doc/current/inst/index.html">Installing Python
|
||||
Modules</a> to create <code>libpythonXX.a</code>, where <code>XX</code>
|
||||
corresponds to the major and minor version numbers of your Python
|
||||
installation.</p>
|
||||
|
||||
<h3><a name="results">Results</a></h3>
|
||||
|
||||
<p>The build process will create a
|
||||
<code>libs/python/build/bin-stage</code> subdirectory of the boost root
|
||||
(or of <code>$(ALL_LOCATE_TARGET)</code>, if you have set that variable),
|
||||
containing the built libraries. The libraries are actually built to
|
||||
unique directories for each toolset and variant elsewhere in the
|
||||
filesystem, and copied to the <code>bin-stage</code> directory as a
|
||||
convenience, so if you build with multiple toolsets at once, the product
|
||||
of later toolsets will overwrite that of earlier toolsets in
|
||||
<code>bin-stage</code>.</p>
|
||||
|
||||
<h3><a name="testing">Testing</a></h3>
|
||||
|
||||
<p>To build and test Boost.Python, start from the
|
||||
<code>libs/python/test</code> directory and invoke</p>
|
||||
|
||||
<blockquote>
|
||||
<pre>
|
||||
bjam -sTOOLS=<i><a href="../../../tools/build/index.html#Tools">toolset</a></i> test
|
||||
bjam -sTOOLS=<i><a href=
|
||||
"../../../more/getting_started.html#Tools">toolset</a></i> test
|
||||
</pre>
|
||||
</blockquote>
|
||||
This will
|
||||
update all of the Boost.Python v1 test and example targets. The tests
|
||||
are relatively quiet by default. To get more-verbose output, you might try
|
||||
<blockquote>
|
||||
</blockquote>
|
||||
This will update all of the Boost.Python v1 test and example targets. The
|
||||
tests are relatively verbose by default. To get less-verbose output, you
|
||||
might try
|
||||
|
||||
<blockquote>
|
||||
<pre>
|
||||
bjam -sTOOLS=<i><a href="../../../tools/build/index.html#Tools">toolset</a></i> -sPYTHON_TEST_ARGS=-v test
|
||||
bjam -sTOOLS=<i><a href=
|
||||
"../../../more/getting_started.html#Tools">toolset</a></i> -sPYTHON_TEST_ARGS= test
|
||||
</pre>
|
||||
</blockquote>
|
||||
which will print each test's Python code with the expected output as
|
||||
it passes.
|
||||
</blockquote>
|
||||
By default, <code>PYTHON_TEST_ARGS</code> is set to <code>-v</code>.
|
||||
|
||||
<h2>Building your Extension Module</h2>
|
||||
<h2><a name="building_ext">Building your Extension Module</a></h2>
|
||||
Though there are other approaches, the smoothest and most reliable way to
|
||||
build an extension module using Boost.Python is with Boost.Build. If you
|
||||
have to use another build system, you should use Boost.Build at least
|
||||
once with the "<code><b>-n</b></code>" option so you can see the
|
||||
command-lines it uses, and replicate them. You are likely to run into
|
||||
compilation or linking problems otherwise.
|
||||
|
||||
Though there are other approaches, the easiest way to build an
|
||||
extension module using Boost.Python is with Boost.Build. Until
|
||||
Boost.Build v2 is released, cross-project build dependencies are
|
||||
not supported, so it works most smoothly if you add a new
|
||||
subproject to your boost installation. The
|
||||
<code>libs/python/example</code> subdirectory of your boost
|
||||
installation contains a minimal example (along with many extra
|
||||
sources). To copy the example subproject:
|
||||
<p>The files required to build a Boost.Python extension module using bjam
|
||||
are the "local" files <tt>Jamfile</tt>, <tt>Jamrules</tt>, and
|
||||
<tt>boost_build.jam</tt>, and the <tt>boost/</tt>
|
||||
and <tt>tools/build/v1/</tt> subdirectories of your Boost
|
||||
tree. The latter directory contains the source code of the
|
||||
Boost.Build system, which is used to generate the correct build
|
||||
commands for your extension module. The '<tt>v1</tt>' refers to
|
||||
Boost.Build version 1. Version 2 is pre-release and currently not
|
||||
ready for general use.
|
||||
|
||||
<ol>
|
||||
<li>Create a new subdirectory in, <code>libs/python</code>, say
|
||||
<code>libs/python/my_project</code>.
|
||||
<p>
|
||||
The <tt>libs/python/example/</tt> project we're going to build is
|
||||
set up to automatically rebuild the Boost.Python library in place
|
||||
whenever it's out-of-date rather than just reusing an existing
|
||||
library, so you'll also need the Boost.Python library sources in
|
||||
<tt>boost/python/src/</tt>.
|
||||
</p>
|
||||
|
||||
<li>Copy <code><a
|
||||
href="../example/Jamfile">libs/python/example/Jamfile</a></code>
|
||||
to your new directory.
|
||||
<blockquote>
|
||||
<b>Note:</b> Third-party package and distribution maintainers
|
||||
for various operating systems sometimes split up Boost's
|
||||
structure or omit parts of it, so if you didn't download an
|
||||
official <a href=
|
||||
"http://sourceforge.net/project/showfiles.php?group_id=7586">Boost
|
||||
release</a> you might want to <a href=
|
||||
"http://cvs.sourceforge.net/viewcvs.py/boost/boost/">browse our CVS
|
||||
structure</a> to make sure you have everything you need, and in the
|
||||
right places.
|
||||
</blockquote>
|
||||
|
||||
<li>Edit the Jamfile as appropriate for your project. You'll
|
||||
want to change the "<code>subproject</code>" rule
|
||||
invocation at the top, and the names of some of the source files
|
||||
and/or targets.
|
||||
<p>The <code><a href="../example">libs/python/example</a></code>
|
||||
subdirectory of your boost installation contains a small example which
|
||||
builds and tests two extensions. To build your own extensions copy the
|
||||
example subproject and make the following two edits:</p>
|
||||
|
||||
</ol>
|
||||
<ol>
|
||||
<li>
|
||||
<code><a href=
|
||||
"../example/boost-build.jam"><b>boost-build.jam</b></a></code> - edit
|
||||
the line which reads
|
||||
|
||||
If you can't modify or copy your boost installation, the
|
||||
alternative is to create your own Boost.Build project. A similar
|
||||
example you can use as a starting point is available in <code><a
|
||||
href="../example/project.zip">this archive</a></code>. You'll
|
||||
need to edit the Jamfile and Jamrules files, depending on the
|
||||
relative location of your Boost installation and the new
|
||||
project. Note that automatic testing of extension modules is not
|
||||
available in this configuration.
|
||||
<blockquote>
|
||||
<pre>
|
||||
boost-build ../../../tools/build/v1 ;
|
||||
</pre>
|
||||
</blockquote>
|
||||
so that the path refers to the <code>tools/build/v1</code>
|
||||
subdirectory of your Boost installation.
|
||||
</li>
|
||||
|
||||
<h2><a name="variants">Build Variants</a></h2>
|
||||
<li>
|
||||
<code><a href="../example/Jamrules"><b>Jamrules</b></a></code> - edit
|
||||
the line which reads
|
||||
|
||||
Three <a
|
||||
href="../../../tools/build/build_system.htm#variants">variant</a>
|
||||
configurations of all python-related targets are supported, and
|
||||
can be selected by setting the <code><a
|
||||
href="../../../tools/build/build_system.htm#user_globals">BUILD</a></code>
|
||||
variable:
|
||||
<blockquote>
|
||||
<pre>
|
||||
path-global BOOST_ROOT : ../../.. ;
|
||||
</pre>
|
||||
</blockquote>
|
||||
so that the path refers to the root directory of your Boost
|
||||
installation.
|
||||
</li>
|
||||
</ol>
|
||||
|
||||
<ul>
|
||||
<li><code>release</code> (optimization, <tt>-DNDEBUG</tt>)
|
||||
<p>The instructions <a href="#testing">above</a> for testing Boost.Python
|
||||
apply equally to your new extension modules in this subproject.</p>
|
||||
|
||||
<li><code>debug</code> (no optimization <tt>-D_DEBUG</tt>)
|
||||
<h2><a name="variants">Build Variants</a></h2>
|
||||
Three <a href=
|
||||
"../../../tools/build/v1/build_system.htm#variants">variant</a>
|
||||
configurations of all python-related targets are supported, and can be
|
||||
selected by setting the <code><a href=
|
||||
"../../../tools/build/v1/build_system.htm#user_globals">BUILD</a></code>
|
||||
variable:
|
||||
|
||||
<li><code>debug-python</code> (no optimization, <tt>-D_DEBUG
|
||||
-DBOOST_DEBUG_PYTHON</tt>)
|
||||
</ul>
|
||||
<ul>
|
||||
<li><code>release</code> (optimization, <tt>-DNDEBUG</tt>)</li>
|
||||
|
||||
<p>The first two variants of the <code>boost_python</code>
|
||||
library are built by default, and are compatible with the
|
||||
default Python distribution. The <code>debug-python</code>
|
||||
variant corresponds to a specially-built debugging version of
|
||||
Python. On Unix platforms, this python is built by adding
|
||||
<code>--with-pydebug</code> when configuring the Python
|
||||
build. On Windows, the debugging version of Python is generated
|
||||
by the "Win32 Debug" target of the
|
||||
<code>PCBuild.dsw</code> Visual C++ 6.0 project in the
|
||||
<code>PCBuild</code> subdirectory of your Python distribution.
|
||||
<li><code>debug</code> (no optimization <tt>-D_DEBUG</tt>)</li>
|
||||
|
||||
Extension modules built with Python debugging enabled are <b>not
|
||||
link-compatible</b> with a non-debug build of Python. Since few
|
||||
people actually have a debug build of Python (it doesn't come
|
||||
with the standard distribution), the normal
|
||||
<code>debug</code> variant builds modules which are compatible
|
||||
with ordinary Python.
|
||||
<li><code>debug-python</code> (no optimization, <tt>-D_DEBUG
|
||||
-DBOOST_DEBUG_PYTHON</tt>)</li>
|
||||
</ul>
|
||||
|
||||
<p>The first two variants of the <code>boost_python</code> library are
|
||||
built by default, and are compatible with the default Python
|
||||
distribution. The <code>debug-python</code> variant corresponds to a
|
||||
specially-built debugging version of Python. On Unix platforms, this
|
||||
python is built by adding <code>--with-pydebug</code> when configuring
|
||||
the Python build. On Windows, the debugging version of Python is
|
||||
generated by the "Win32 Debug" target of the <code>PCBuild.dsw</code>
|
||||
Visual C++ 6.0 project in the <code>PCBuild</code> subdirectory of your
|
||||
Python distribution. Extension modules built with Python debugging
|
||||
enabled are <b>not link-compatible</b> with a non-debug build of Python.
|
||||
Since few people actually have a debug build of Python (it doesn't come
|
||||
with the standard distribution), the normal <code>debug</code> variant
|
||||
builds modules which are compatible with ordinary Python.</p>
|
||||
|
||||
<p>On many windows compilers, when extension modules are built
|
||||
with
|
||||
<tt>-D_DEBUG</tt>, Python defaults to <i>force</i> linking with a
|
||||
special debugging version of the Python DLL. Since this debug DLL
|
||||
isn't supplied with the default Python installation for Windows,
|
||||
Boost.Python uses <tt><a href=
|
||||
"../../../boost/python/detail/wrap_python.hpp">boost/python/detail/wrap_python.hpp</a></tt>
|
||||
to temporarily undefine <tt>_DEBUG</tt> when <tt>Python.h</tt> is
|
||||
<tt>#include</tt>d - unless <code>BOOST_DEBUG_PYTHON</code> is defined.
|
||||
<p>On many windows compilers, when extension modules are built with
|
||||
<tt>-D_DEBUG</tt>, Python defaults to <i>force</i> linking with a special
|
||||
debugging version of the Python DLL. Since this debug DLL isn't supplied
|
||||
with the default Python installation for Windows, Boost.Python uses
|
||||
<tt><a href=
|
||||
"../../../boost/python/detail/wrap_python.hpp">boost/python/detail/wrap_python.hpp</a></tt>
|
||||
to temporarily undefine <tt>_DEBUG</tt> when <tt>Python.h</tt> is
|
||||
<tt>#include</tt>d - unless <code>BOOST_DEBUG_PYTHON</code> is
|
||||
defined.</p>
|
||||
|
||||
<p>If you want the extra runtime checks available with the
|
||||
debugging version of the library, <tt>#define
|
||||
BOOST_DEBUG_PYTHON</tt> to re-enable python debuggin, and link
|
||||
with the <code>debug-python</code> variant of
|
||||
<tt>boost_python</tt>.
|
||||
<p>If you want the extra runtime checks available with the debugging
|
||||
version of the library, <tt>#define BOOST_DEBUG_PYTHON</tt> to re-enable
|
||||
python debuggin, and link with the <code>debug-python</code> variant of
|
||||
<tt>boost_python</tt>.</p>
|
||||
|
||||
<p>If you do not <tt>#define BOOST_DEBUG_PYTHON</tt>, be sure that
|
||||
any source files in your extension module <tt>#include <<a href=
|
||||
"../../../boost/python/detail/wrap_python.hpp">boost/python/detail/wrap_python.hpp</a>></tt>
|
||||
instead of the usual <tt>Python.h</tt>, or you will have link
|
||||
incompatibilities.<br>
|
||||
<p>If you do not <tt>#define BOOST_DEBUG_PYTHON</tt>, be sure that any
|
||||
source files in your extension module <tt>#include <<a href=
|
||||
"../../../boost/python/detail/wrap_python.hpp">boost/python/detail/wrap_python.hpp</a>></tt>
|
||||
instead of the usual <tt>Python.h</tt>, or you will have link
|
||||
incompatibilities.<br>
|
||||
</p>
|
||||
|
||||
<hr>
|
||||
Next: <a href="enums.html">Wrapping Enums</a> Previous: <a href=
|
||||
"under-the-hood.html">A Peek Under the Hood</a> Up: <a href=
|
||||
"index.html">Top</a>
|
||||
<h2><a name="VisualStudio">Building Using the Microsoft Visual Studio
|
||||
IDE</a></h2>
|
||||
|
||||
<hr>
|
||||
<p>© Copyright David Abrahams 2002. Permission to copy, use, modify,
|
||||
sell and distribute this document is granted provided this copyright
|
||||
notice appears in all copies. This document is provided ``as is'' without
|
||||
express or implied warranty, and with no claim as to its suitability for
|
||||
any purpose.
|
||||
<p>For the those of you who feel more comfortable in the IDE world, a
|
||||
workspace and project file have been included in the <a href=
|
||||
"../build/VisualStudio">libs/python/build/VisualStudio</a> subdirectory.
|
||||
It builds release and debug versions of the Boost.Python libraries and
|
||||
places them and the same directory as Jamfile build does, though the
|
||||
intermediate object files are placed in a different directory. The files
|
||||
have been created using Microsoft Visual C++ version 6, but they should
|
||||
work for later versions as well. You will need to tell the IDE where to
|
||||
find the Python <code>Include/</code> and <code>Libs/</code> directories.
|
||||
Under <b>Tools>Options>Directories</b>, add an entry for the Python
|
||||
include dir (i.e. <code>c:/Python22/Include</code>), and one for the Lib
|
||||
(i.e. <code>c:/Python/Libs</code>. Make sure it is <code>Libs</code> with
|
||||
an "<code>s</code>" and not just <code>Lib</code>).</p>
|
||||
|
||||
<h3>Using the IDE for your own projects</h3>
|
||||
|
||||
<p>Building your own projects using the IDE is slightly more complicated.
|
||||
Firstly, you need to make sure that the project you create as the right
|
||||
kind. It should be a "Win32 Dynamic-Link Library". The default one that
|
||||
Visual Studio 6 creates needs some modifications: turn on RTTI, and
|
||||
change the debug and release builds to use the respective debug and
|
||||
release Multithreaded DLL versions. You should probably turn off
|
||||
incremental linking too -- I believe it a bit flaky. If you do this, then
|
||||
change the "Debug Info" to "Program Database" to get rid of the Edit and
|
||||
Continue warning.</p>
|
||||
|
||||
<p>You'll need to add the Boost root directory under
|
||||
<b>Tools>Options>Directories</b> to get your code compiling. To
|
||||
make it link, add the above <code>boost_python.dsp</code> file to your
|
||||
workspace, and make your project depend upon it (under
|
||||
<b>Project>Dependencies</b>). You should be able to build now.</p>
|
||||
|
||||
<p>Lastly, go to the <b>Project Settings>Debug</b> Page and add the
|
||||
<code>Python.exe</code> as the executable for the project. Set a startup
|
||||
directory, and make sure that your current project's output dll, the
|
||||
<code>boost_python.dll</code> and the <code>python22.dll</code> are on
|
||||
the current <code>PATH</code>. If you have a python script that tests
|
||||
your dll, then add it in the "Program Arguments". Now, if all went well,
|
||||
you should be able to hit the Run (F5) button, and debug your code.</p>
|
||||
|
||||
<blockquote>
|
||||
<em>The Visual Studio project files are graciously contributed and
|
||||
maintained by <a href="mailto:brett.calcott@paradise.net.nz">Brett
|
||||
Calcott</a></em>.
|
||||
</blockquote>
|
||||
<hr>
|
||||
|
||||
<p>© Copyright David Abrahams 2002-2004. Permission to copy,
|
||||
use, modify, sell and distribute this document is granted provided
|
||||
this copyright notice appears in all copies. This document is
|
||||
provided ``as is'' without express or implied warranty, and with
|
||||
no claim as to its suitability for any purpose.</p>
|
||||
|
||||
<p>Updated: 13 April 2004 (David Abrahams)</p>
|
||||
</body>
|
||||
</html>
|
||||
|
||||
<p>Updated: May 15, 2002 (David Abrahams)
|
||||
</div>
|
||||
|
||||
@@ -1,231 +0,0 @@
|
||||
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0//EN"
|
||||
"http://www.w3.org/TR/REC-html40/strict.dtd">
|
||||
<title>
|
||||
Comparisons with Other Systems
|
||||
</title>
|
||||
<div>
|
||||
<h1>
|
||||
<img width="277" height="86" id="_x0000_i1025" align="center"
|
||||
src="../../../c++boost.gif" alt= "c++boost.gif (8819 bytes)"><br>
|
||||
Comparisons with
|
||||
Other Systems
|
||||
</h1>
|
||||
|
||||
<h2>CXX</h2>
|
||||
<p>
|
||||
Like Boost.Python, <a href="http://cxx.sourceforge.net/">CXX</a> attempts to
|
||||
provide a C++-oriented interface to Python. In most cases, as with the
|
||||
boost library, it relieves the user from worrying about
|
||||
reference-counts. Both libraries automatically convert thrown C++
|
||||
exceptions into Python exceptions. As far as I can tell, CXX has no
|
||||
support for subclassing C++ extension types in Python. An even
|
||||
more significant difference is that a user's C++ code is still basically
|
||||
``dealing with Python objects'', though they are wrapped in
|
||||
C++ classes. This means such jobs as argument parsing and conversion are
|
||||
still left to be done explicitly by the user.
|
||||
|
||||
<p>
|
||||
CXX claims to interoperate well with the C++ Standard Library
|
||||
(a.k.a. STL) by providing iterators into Python Lists and Dictionaries,
|
||||
but the claim is unfortunately unsupportable. The problem is that in
|
||||
general, access to Python sequence and mapping elements through
|
||||
iterators requires the use of proxy objects as the return value of
|
||||
iterator dereference operations. This usage conflicts with the basic
|
||||
ForwardIterator requirements in <a
|
||||
href="http://anubis.dkuug.dk/jtc1/sc22/open/n2356/lib-iterators.html#lib.forward.iterators">
|
||||
section 24.1.3 of the standard</a> (dereferencing must produce a
|
||||
reference). Although you may be able to use these iterators with some
|
||||
operations in some standard library implementations, it is neither
|
||||
guaranteed to work nor portable.
|
||||
|
||||
<p>
|
||||
As far as I can tell, CXX enables one to write what is essentially
|
||||
idiomatic Python code in C++, manipulating Python objects through the
|
||||
same fully-generic interfaces we use in Python. While you're hardly
|
||||
programming directly to the ``bare metal'' with CXX, it basically
|
||||
presents a ``C++-ized'' version of the Python 'C' API. Some fraction of
|
||||
that capability is available in Boost.Python through <tt><a
|
||||
href="../../../boost/python/objects.hpp">boost/python/objects.hpp</a></tt>,
|
||||
which provides C++ objects corresponding to Python lists, tuples,
|
||||
strings, and dictionaries, and through <tt><a
|
||||
href="../../../boost/python/callback.hpp">boost/python/callback.hpp</a></tt>,
|
||||
which allows you to call back into python with C++ arguments.
|
||||
|
||||
<p>
|
||||
<a href="mailto:dubois1@llnl.gov">Paul F. Dubois</a>, the original
|
||||
author of CXX, has told me that what I've described is only half of the
|
||||
picture with CXX, but I never understood his explanation well-enough to
|
||||
fill in the other half. Here is his response to the commentary above:
|
||||
|
||||
<blockquote>
|
||||
``My intention with CXX was not to do what you are doing. It was to enable a
|
||||
person to write an extension directly in C++ rather than C. I figured others had
|
||||
the wrapping business covered. I thought maybe CXX would provide an easier
|
||||
target language for those making wrappers, but I never explored
|
||||
that.''<br><i>-<a href="mailto:dubois1@llnl.gov">Paul Dubois</a></i>
|
||||
</blockquote>
|
||||
|
||||
<h2>SWIG</h2>
|
||||
<p>
|
||||
<a href= "http://www.swig.org/">SWIG</a> is an impressively mature tool
|
||||
for exporting an existing ANSI 'C' interface into various scripting
|
||||
languages. Swig relies on a parser to read your source code and produce
|
||||
additional source code files which can be compiled into a Python (or
|
||||
Perl or Tcl) extension module. It has been successfully used to create
|
||||
many Python extension modules. Like Boost.Python, SWIG is trying to allow an
|
||||
existing interface to be wrapped with little or no change to the
|
||||
existing code. The documentation says ``SWIG parses a form of ANSI C
|
||||
syntax that has been extended with a number of special directives. As a
|
||||
result, interfaces are usually built by grabbing a header file and
|
||||
tweaking it a little bit.'' For C++ interfaces, the tweaking has often
|
||||
proven to amount to more than just a little bit. One user
|
||||
writes:
|
||||
|
||||
<blockquote> ``The problem with swig (when I used it) is that it
|
||||
couldnt handle templates, didnt do func overloading properly etc. For
|
||||
ANSI C libraries this was fine. But for usual C++ code this was a
|
||||
problem. Simple things work. But for anything very complicated (or
|
||||
realistic), one had to write code by hand. I believe Boost.Python doesn't have
|
||||
this problem[<a href="#sic">sic</a>]... IMHO overloaded functions are very important to
|
||||
wrap correctly.''<br><i>-Prabhu Ramachandran</i>
|
||||
</blockquote>
|
||||
|
||||
<p>
|
||||
By contrast, Boost.Python doesn't attempt to parse C++ - the problem is simply
|
||||
too complex to do correctly. <a name="sic">Technically</a>, one does
|
||||
write code by hand to use Boost.Python. The goal, however, has been to make
|
||||
that code nearly as simple as listing the names of the classes and
|
||||
member functions you want to expose in Python.
|
||||
|
||||
<h2>SIP</h2>
|
||||
<p>
|
||||
<a
|
||||
href="http://www.thekompany.com/projects/pykde/background.php3?dhtml_ok=1">SIP</a>
|
||||
is a system similar to SWIG, though seemingly more
|
||||
C++-oriented. The author says that like Boost.Python, SIP supports overriding
|
||||
extension class member functions in Python subclasses. It appears to
|
||||
have been designed specifically to directly support some features of
|
||||
PyQt/PyKDE, which is its primary client. Documentation is almost
|
||||
entirely missing at the time of this writing, so a detailed comparison
|
||||
is difficult.
|
||||
|
||||
<h2>ILU</h2>
|
||||
<p>
|
||||
<a
|
||||
href="ftp://ftp.parc.xerox.com/pub/ilu/ilu.html">ILU</a>
|
||||
is a very ambitious project which tries to describe a module's interface
|
||||
(types and functions) in terms of an <a
|
||||
href="ftp://ftp.parc.xerox.com/pub/ilu/2.0b1/manual-html/manual_2.html">Interface
|
||||
Specification Language</a> (ISL) so that it can be uniformly interfaced
|
||||
to a wide range of computer languages, including Common Lisp, C++, C,
|
||||
Modula-3, and Python. ILU can parse the ISL to generate a C++ language
|
||||
header file describing the interface, of which the user is expected to
|
||||
provide an implementation. Unlike Boost.Python, this means that the system
|
||||
imposes implementation details on your C++ code at the deepest level. It
|
||||
is worth noting that some of the C++ names generated by ILU are supposed
|
||||
to be reserved to the C++ implementation. It is unclear from the
|
||||
documentation whether ILU supports overriding C++ virtual functions in Python.
|
||||
|
||||
<h2>GRAD</h2>
|
||||
<p>
|
||||
<a
|
||||
href="http://www.python.org/workshops/1996-11/papers/GRAD/html/GRADcover.html">GRAD</a>
|
||||
is another very ambitious project aimed at generating Python wrappers for
|
||||
interfaces written in ``legacy languages'', among which C++ is the first one
|
||||
implemented. Like SWIG, it aims to parse source code and automatically
|
||||
generate wrappers, though it appears to take a more sophisticated approach
|
||||
to parsing in general and C++ in particular, so it should do a much better
|
||||
job with C++. It appears to support function overloading. The
|
||||
documentation is missing a lot of information I'd like to see, so it is
|
||||
difficult to give an accurate and fair assessment. I am left with the
|
||||
following questions:
|
||||
<ul>
|
||||
<li>Does it support overriding of virtual functions?
|
||||
<li>What about overriding private or protected virtual functions (the documentation indicates
|
||||
that only public interfaces are supported)?
|
||||
<li>Which C++ language constructs are supportd?
|
||||
<li>Does it support implicit conversions between wrapped C++ classes that have
|
||||
an inheritance relationship?
|
||||
<li>Does it support smart pointers?
|
||||
</ul>
|
||||
<p>
|
||||
Anyone in the possession of the answers to these questions will earn my
|
||||
gratitude for a write-up <code>;-)</code>
|
||||
|
||||
<h2>Zope ExtensionClasses</h2>
|
||||
<p>
|
||||
<a href="http:http://www.digicool.com/releases/ExtensionClass">
|
||||
ExtensionClasses in Zope</a> use the same underlying mechanism as Boost.Python
|
||||
to support subclassing of extension types in Python, including
|
||||
multiple-inheritance. Both systems support pickling/unpickling of
|
||||
extension class instances in very similar ways. Both systems rely on the
|
||||
same ``<a
|
||||
href="http://www.python.org/workshops/1994-11/BuiltInClasses/Welcome.html">Don
|
||||
Beaudry Hack</a>'' that also inspired Don's MESS System.
|
||||
<p>
|
||||
The major differences are:
|
||||
<ul>
|
||||
<li>Zope is entirely 'C' language-based. It doesn't require a C++
|
||||
compiler, so it's much more portable than Boost.Python, which stresses
|
||||
the limits of even some modern C++ implementations.
|
||||
|
||||
<li>
|
||||
Boost.Python lifts the burden on the user to parse and convert function
|
||||
argument types. Zope provides no such facility.
|
||||
<li>
|
||||
Boost.Python lifts the burden on the user to maintain Python
|
||||
reference-counts.
|
||||
<li>
|
||||
Boost.Python supports function overloading; Zope does not.
|
||||
<li>
|
||||
Boost.Python supplies a simple mechanism for exposing read-only and
|
||||
read/write access to data members of the wrapped C++ type as Python
|
||||
attributes.
|
||||
<li>
|
||||
Writing a Zope ExtensionClass is significantly more complex than
|
||||
exposing a C++ class to python using Boost.Python (mostly a summary of the
|
||||
previous 4 items). <a href=
|
||||
"http://www.digicool.com/releases/ExtensionClass/MultiMapping.html">A
|
||||
Zope Example</a> illustrates the differences.
|
||||
<li>
|
||||
Zope's ExtensionClasses are specifically motivated by ``the need for a
|
||||
C-based persistence mechanism''. Boost.Python's are motivated by the desire
|
||||
to simply reflect a C++ API into Python with as little modification as
|
||||
possible.
|
||||
<li>
|
||||
The following Zope restriction does not apply to Boost.Python: ``At most one
|
||||
base extension direct or indirect super class may define C data
|
||||
members. If an extension subclass inherits from multiple base
|
||||
extension classes, then all but one must be mix-in classes that
|
||||
provide extension methods but no data.''
|
||||
<li>
|
||||
Zope requires use of the somewhat funky inheritedAttribute (search for
|
||||
``inheritedAttribute'' on <a
|
||||
href="http://www.digicool.com/releases/ExtensionClass">this page</a>)
|
||||
method to access base class methods. In Boost.Python, base class methods can
|
||||
be accessed in the usual way by writing
|
||||
``<code>BaseClass.method</code>''.
|
||||
<li>
|
||||
Zope supplies some creative but esoteric idioms such as <a href=
|
||||
"http://www.digicool.com/releases/ExtensionClass/Acquisition.html">
|
||||
Acquisition</a>. No specific support for this is built into Boost.Python.
|
||||
<li>
|
||||
Zope's ComputedAttribute support is designed to be used from Python.
|
||||
<a href="special.html#getter_setter">The analogous feature of
|
||||
Boost.Python</a> can be used from C++ or Python. The feature is arguably
|
||||
easier to use in Boost.Python.
|
||||
</ul>
|
||||
<p>
|
||||
Next: <a href="example1.html">A Simple Example Using Boost.Python</a>
|
||||
Previous: <a href="extending.html">A Brief Introduction to writing Python Extension Modules</a>
|
||||
Up: <a href="index.html">Top</a>
|
||||
<p>
|
||||
© Copyright David Abrahams 2000. Permission to copy, use, modify,
|
||||
sell and distribute this document is granted provided this copyright
|
||||
notice appears in all copies. This document is provided ``as is'' without
|
||||
express or implied warranty, and with no claim as to its suitability
|
||||
for any purpose.
|
||||
<p>
|
||||
Updated: Mar 6, 2001
|
||||
</div>
|
||||
|
||||
@@ -1,336 +0,0 @@
|
||||
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0//EN"
|
||||
"http://www.w3.org/TR/REC-html40/strict.dtd">
|
||||
|
||||
<title>Cross-extension-module dependencies</title>
|
||||
|
||||
<div>
|
||||
|
||||
<img src="../../../c++boost.gif"
|
||||
alt="c++boost.gif (8819 bytes)"
|
||||
align="center"
|
||||
width="277" height="86">
|
||||
|
||||
<hr>
|
||||
<h1>Cross-extension-module dependencies</h1>
|
||||
|
||||
It is good programming practice to organize large projects as modules
|
||||
that interact with each other via well defined interfaces. With
|
||||
Boost.Python it is possible to reflect this organization at the C++
|
||||
level at the Python level. This is, each logical C++ module can be
|
||||
organized as a separate Python extension module.
|
||||
|
||||
<p>
|
||||
At first sight this might seem natural and straightforward. However, it
|
||||
is a fairly complex problem to establish cross-extension-module
|
||||
dependencies while maintaining the same ease of use Boost.Python
|
||||
provides for classes that are wrapped in the same extension module. To
|
||||
a large extent this complexity can be hidden from the author of a
|
||||
Boost.Python extension module, but not entirely.
|
||||
|
||||
<hr>
|
||||
<h2>The recipe</h2>
|
||||
|
||||
Suppose there is an extension module that exposes certain instances of
|
||||
the C++ <tt>std::vector</tt> template library such that it can be used
|
||||
from Python in the following manner:
|
||||
|
||||
<pre>
|
||||
import std_vector
|
||||
v = std_vector.double([1, 2, 3, 4])
|
||||
v.push_back(5)
|
||||
v.size()
|
||||
</pre>
|
||||
|
||||
Suppose the <tt>std_vector</tt> module is done well and reflects all
|
||||
C++ functions that are useful at the Python level, for all C++ built-in
|
||||
data types (<tt>std_vector.int</tt>, <tt>std_vector.long</tt>, etc.).
|
||||
|
||||
<p>
|
||||
Suppose further that there is statistic module with a C++ class that
|
||||
has constructors or member functions that use or return a
|
||||
<tt>std::vector</tt>. For example:
|
||||
|
||||
<pre>
|
||||
class xy {
|
||||
public:
|
||||
xy(const std::vector<double>& x, const std::vector<double>& y) : m_x(x), m_y(y) {}
|
||||
const std::vector<double>& x() const { return m_x; }
|
||||
const std::vector<double>& y() const { return m_y; }
|
||||
double correlation();
|
||||
private:
|
||||
std::vector<double> m_x;
|
||||
std::vector<double> m_y;
|
||||
}
|
||||
</pre>
|
||||
|
||||
What is more natural than reusing the <tt>std_vector</tt> extension
|
||||
module to expose these constructors or functions to Python?
|
||||
|
||||
<p>
|
||||
Unfortunately, what seems natural needs a little work in both the
|
||||
<tt>std_vector</tt> and the <tt>statistics</tt> module.
|
||||
|
||||
<p>
|
||||
In the <tt>std_vector</tt> extension module,
|
||||
<tt>std::vector<double></tt> is exposed to Python in the usual
|
||||
way with the <tt>class_builder<></tt> template. To also enable the
|
||||
automatic conversion of <tt>std::vector<double></tt> function
|
||||
arguments or return values in other Boost.Python C++ modules, the
|
||||
converters that convert a <tt>std::vector<double></tt> C++ object
|
||||
to a Python object and vice versa (i.e. the <tt>to_python()</tt> and
|
||||
<tt>from_python()</tt> template functions) have to be exported. For
|
||||
example:
|
||||
|
||||
<pre>
|
||||
#include <boost/python/cross_module.hpp>
|
||||
//...
|
||||
class_builder<std::vector<double> > v_double(std_vector_module, "double");
|
||||
export_converters(v_double);
|
||||
</pre>
|
||||
|
||||
In the extension module that wraps <tt>class xy</tt> we can now import
|
||||
these converters with the <tt>import_converters<></tt> template.
|
||||
For example:
|
||||
|
||||
<pre>
|
||||
#include <boost/python/cross_module.hpp>
|
||||
//...
|
||||
import_converters<std::vector<double> > v_double_converters("std_vector", "double");
|
||||
</pre>
|
||||
|
||||
That is all. All the attributes that are defined for
|
||||
<tt>std_vector.double</tt> in the <tt>std_vector</tt> Boost.Python
|
||||
module will be available for the returned objects of <tt>xy.x()</tt>
|
||||
and <tt>xy.y()</tt>. Similarly, the constructor for <tt>xy</tt> will
|
||||
accept objects that were created by the <tt>std_vector</tt>module.
|
||||
|
||||
<hr>
|
||||
<h2>Placement of <tt>import_converters<></tt> template instantiations</h2>
|
||||
|
||||
<tt>import_converts<></tt> can be viewed as a drop-in replacement
|
||||
for <tt>class_wrapper<></tt>, and the recommendations for the
|
||||
placement of <tt>class_wrapper<></tt> template instantiations
|
||||
also apply to to <tt>import_converts<></tt>. In particular, it is
|
||||
important that an instantiation of <tt>class_wrapper<></tt> is
|
||||
visible to any code which wraps a C++ function with a <tt>T</tt>,
|
||||
<tt>T*</tt>, const <tt>T&</tt>, etc. parameter or return value.
|
||||
Therefore you may want to group all <tt>class_wrapper<></tt> and
|
||||
<tt>import_converts<></tt> instantiations at the top of your
|
||||
module's init function, then <tt>def()</tt> the member functions later
|
||||
to avoid problems with inter-class dependencies.
|
||||
|
||||
<hr>
|
||||
<h2>Non-copyable types</h2>
|
||||
|
||||
<tt>export_converters()</tt> instantiates C++ template functions that
|
||||
invoke the copy constructor of the wrapped type. For a type that is
|
||||
non-copyable this will result in compile-time error messages. In such a
|
||||
case, <tt>export_converters_noncopyable()</tt> can be used to export
|
||||
the converters that do not involve the copy constructor of the wrapped
|
||||
type. For example:
|
||||
|
||||
<pre>
|
||||
class_builder<store> py_store(your_module, "store");
|
||||
export_converters_noncopyable(py_store);
|
||||
</pre>
|
||||
|
||||
The corresponding <tt>import_converters<></tt> statement does not
|
||||
need any special attention:
|
||||
|
||||
<pre>
|
||||
import_converters<store> py_store("noncopyable_export", "store");
|
||||
</pre>
|
||||
|
||||
<hr>
|
||||
<h2>Python module search path</h2>
|
||||
|
||||
The <tt>std_vector</tt> and <tt>statistics</tt> modules can now be used
|
||||
in the following way:
|
||||
|
||||
<pre>
|
||||
import std_vector
|
||||
import statistics
|
||||
x = std_vector.double([1, 2, 3, 4])
|
||||
y = std_vector.double([2, 4, 6, 8])
|
||||
xy = statistics.xy(x, y)
|
||||
xy.correlation()
|
||||
</pre>
|
||||
|
||||
In this example it is clear that Python has to be able to find both the
|
||||
<tt>std_vector</tt> and the <tt>statistics</tt> extension module. In
|
||||
other words, both extension modules need to be in the Python module
|
||||
search path (<tt>sys.path</tt>).
|
||||
|
||||
<p>
|
||||
The situation is not always this obvious. Suppose the
|
||||
<tt>statistics</tt> module has a <tt>random()</tt> function that
|
||||
returns a vector of random numbers with a given length:
|
||||
|
||||
<pre>
|
||||
import statistics
|
||||
x = statistics.random(5)
|
||||
y = statistics.random(5)
|
||||
xy = statistics.xy(x, y)
|
||||
xy.correlation()
|
||||
</pre>
|
||||
|
||||
A naive user will not easily anticipate that the <tt>std_vector</tt>
|
||||
module is used to pass the <tt>x</tt> and <tt>y</tt> vectors around. If
|
||||
the <tt>std_vector</tt> module is in the Python module search path,
|
||||
this form of ignorance is of no harm. On the contrary, we are glad
|
||||
that we do not have to bother the user with details like this.
|
||||
|
||||
<p>
|
||||
If the <tt>std_vector</tt> module is not in the Python module search
|
||||
path, a Python exception will be raised:
|
||||
|
||||
<pre>
|
||||
Traceback (innermost last):
|
||||
File "foo.py", line 2, in ?
|
||||
x = statistics.random(5)
|
||||
ImportError: No module named std_vector
|
||||
</pre>
|
||||
|
||||
As is the case with any system of a non-trivial complexity, it is
|
||||
important that the setup is consistent and complete.
|
||||
|
||||
<hr>
|
||||
<h2>Two-way module dependencies</h2>
|
||||
|
||||
Boost.Python supports two-way module dependencies. This is best
|
||||
illustrated by a simple example.
|
||||
|
||||
<p>
|
||||
Suppose there is a module <tt>ivect</tt> that implements vectors of
|
||||
integers, and a similar module <tt>dvect</tt> that implements vectors
|
||||
of doubles. We want to be able do convert an integer vector to a double
|
||||
vector and vice versa. For example:
|
||||
|
||||
<pre>
|
||||
import ivect
|
||||
iv = ivect.ivect((1,2,3,4,5))
|
||||
dv = iv.as_dvect()
|
||||
</pre>
|
||||
|
||||
The last expression will implicitly import the <tt>dvect</tt> module in
|
||||
order to enable the conversion of the C++ representation of
|
||||
<tt>dvect</tt> to a Python object. The analogous is possible for a
|
||||
<tt>dvect</tt>:
|
||||
|
||||
<pre>
|
||||
import dvect
|
||||
dv = dvect.dvect((1,2,3,4,5))
|
||||
iv = dv.as_ivect()
|
||||
</pre>
|
||||
|
||||
Now the <tt>ivect</tt> module is imported implicitly.
|
||||
|
||||
<p>
|
||||
Note that the two-way dependencies are possible because the
|
||||
dependencies are resolved only when needed. This is, the initialization
|
||||
of the <tt>ivect</tt> module does not rely on the <tt>dvect</tt>
|
||||
module, and vice versa. Only if <tt>as_dvect()</tt> or
|
||||
<tt>as_ivect()</tt> is actually invoked will the corresponding module
|
||||
be implicitly imported. This also means that, for example, the
|
||||
<tt>dvect</tt> module does not have to be available at all if
|
||||
<tt>as_dvect()</tt> is never used.
|
||||
|
||||
<hr>
|
||||
<h2>Clarification of compile-time and link-time dependencies</h2>
|
||||
|
||||
Boost.Python's support for resolving cross-module dependencies at
|
||||
runtime does not imply that compile-time dependencies are eliminated.
|
||||
For example, the statistics extension module in the example above will
|
||||
need to <tt>#include <vector></tt>. This is immediately obvious
|
||||
from the definition of <tt>class xy</tt>.
|
||||
|
||||
<p>
|
||||
If a library is wrapped that consists of both header files and compiled
|
||||
components (e.g. <tt>libdvect.a</tt>, <tt>dvect.lib</tt>, etc.), both
|
||||
the Boost.Python extension module with the
|
||||
<tt>export_converters()</tt> statement and the module with the
|
||||
<tt>import_converters<></tt> statement need to be linked against
|
||||
the object library. Ideally one would build a shared library (e.g.
|
||||
<tt>libdvect.so</tt>, <tt>dvect.dll</tt>, etc.). However, this
|
||||
introduces the issue of having to configure the search path for the
|
||||
dynamic loading correctly. For small libraries it is therefore often
|
||||
more convenient to ignore the fact that the object files are loaded
|
||||
into memory more than once.
|
||||
|
||||
<hr>
|
||||
<h2>Summary of motivation for cross-module support</h2>
|
||||
|
||||
The main purpose of Boost.Python's cross-module support is to allow for
|
||||
a modular system layout. With this support it is straightforward to
|
||||
reflect C++ code organization at the Python level. Without the
|
||||
cross-module support, a multi-purpose module like <tt>std_vector</tt>
|
||||
would be impractical because the entire wrapper code would somehow have
|
||||
to be duplicated in all extension modules that use it, making them
|
||||
harder to maintain and harder to build.
|
||||
|
||||
<p>
|
||||
Another motivation for the cross-module support is that two extension
|
||||
modules that wrap the same class cannot both be imported into Python.
|
||||
For example, if there are two modules <tt>A</tt> and <tt>B</tt> that
|
||||
both wrap a given <tt>class X</tt>, this will work:
|
||||
|
||||
<pre>
|
||||
import A
|
||||
x = A.X()
|
||||
</pre>
|
||||
|
||||
This will also work:
|
||||
|
||||
<pre>
|
||||
import B
|
||||
x = B.X()
|
||||
</pre>
|
||||
|
||||
However, this will fail:
|
||||
|
||||
<pre>
|
||||
import A
|
||||
import B
|
||||
python: /net/cci/rwgk/boost/boost/python/detail/extension_class.hpp:866:
|
||||
static void boost::python::detail::class_registry<X>::register_class(boost::python::detail::extension_class_base *):
|
||||
Assertion `static_class_object == 0' failed.
|
||||
Abort
|
||||
</pre>
|
||||
|
||||
A good solution is to wrap <tt>class X</tt> only once. Depending on the
|
||||
situation, this could be done by module <tt>A</tt> or <tt>B</tt>, or an
|
||||
additional small extension module that only wraps and exports
|
||||
<tt>class X</tt>.
|
||||
|
||||
<p>
|
||||
Finally, there can be important psychological or political reasons for
|
||||
using the cross-module support. If a group of classes is lumped
|
||||
together with many others in a huge module, the authors will have
|
||||
difficulties in being identified with their work. The situation is
|
||||
much more transparent if the work is represented by a module with a
|
||||
recognizable name. This is not just a question of strong egos, but also
|
||||
of getting credit and funding.
|
||||
|
||||
<hr>
|
||||
<h2>Why not use <tt>export_converters()</tt> universally?</h2>
|
||||
|
||||
There is some overhead associated with the Boost.Python cross-module
|
||||
support. Depending on the platform, the size of the code generated by
|
||||
<tt>export_converters()</tt> is roughly 10%-20% of that generated
|
||||
by <tt>class_builder<></tt>. For a large extension module with
|
||||
many wrapped classes, this could mean a significant difference.
|
||||
Therefore the general recommendation is to use
|
||||
<tt>export_converters()</tt> only for classes that are likely to
|
||||
be used as function arguments or return values in other modules.
|
||||
|
||||
<hr>
|
||||
© Copyright Ralf W. Grosse-Kunstleve 2001. Permission to copy,
|
||||
use, modify, sell and distribute this document is granted provided this
|
||||
copyright notice appears in all copies. This document is provided "as
|
||||
is" without express or implied warranty, and with no claim as to its
|
||||
suitability for any purpose.
|
||||
|
||||
<p>
|
||||
Updated: April 2001
|
||||
|
||||
</div>
|
||||
@@ -1,192 +0,0 @@
|
||||
Given a real Python class 'A', a wrapped C++ class 'B', and this definition:
|
||||
|
||||
class C(A, B):
|
||||
def __init__(self):
|
||||
B.__init__(self)
|
||||
self.x = 1
|
||||
...
|
||||
|
||||
c = C()
|
||||
|
||||
this diagram describes the internal structure of an instance of 'C', including
|
||||
its inheritance relationships. Note that ExtensionClass<B> is derived from
|
||||
Class<ExtensionInstance>, and is in fact identical for all intents and purposes.
|
||||
|
||||
MetaClass<ExtensionInstance>
|
||||
+---------+ +---------+
|
||||
types.ClassType: | | | |
|
||||
| | | |
|
||||
| | | |
|
||||
+---------+ +---------+
|
||||
^ ^ ^
|
||||
PyClassObject | ExtensionClass<B> | |
|
||||
A: +------------+ | B: +------------+ | |
|
||||
| ob_type -+-+ | ob_type -+-----+ |
|
||||
| | ()<--+- __bases__ | |
|
||||
| | | __dict__ -+->{...} |
|
||||
| | 'B'<-+- __name__ | |
|
||||
+------------+ +------------+ |
|
||||
^ ^ |
|
||||
| | |
|
||||
+-----+ +-------------+ |
|
||||
| | |
|
||||
| | Class<ExtensionInstance> |
|
||||
| | C: +------------+ |
|
||||
| | | ob_type -+------------+
|
||||
tuple:(*, *)<--+- __bases__ |
|
||||
| __dict__ -+->{__module__, <methods, etc.>}
|
||||
'C' <-+- __name__ |
|
||||
+------------+
|
||||
^ (in case of inheritance from more than one
|
||||
| extension class, this vector would contain
|
||||
+---------------+ a pointer to an instance holder for the data
|
||||
| of each corresponding C++ class)
|
||||
| ExtensionInstance
|
||||
| c: +---------------------+ std::vector<InstanceHolderBase>
|
||||
+----+- __class__ | +---+--
|
||||
| m_wrapped_objects -+->| * | ...
|
||||
{'x': 1}<-+- __dict__ | +-|-+--
|
||||
+---------------------+ | InstanceValueHolder<B>
|
||||
| +--------------------------------+
|
||||
+-->| (contains a C++ instance of B) |
|
||||
+--------------------------------+
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
In our inheritance test cases in extclass_demo.cpp/test_extclass.py, we have the
|
||||
following C++ inheritance hierarchy:
|
||||
|
||||
+-----+ +----+
|
||||
| A1 | | A2 |
|
||||
+-----+ +----+
|
||||
^ ^ ^ ^ ^
|
||||
| | | | |
|
||||
+-----+ | +---------+-----+
|
||||
| | | |
|
||||
| +---+----------+
|
||||
.......!...... | |
|
||||
: A_callback : +-+--+ +-+--+
|
||||
:............: | B1 | | B2 |
|
||||
+----+ +----+
|
||||
^
|
||||
|
|
||||
+-------+---------+
|
||||
| |
|
||||
+-+-+ ......!.......
|
||||
| C | : B_callback :
|
||||
+---+ :............:
|
||||
|
||||
|
||||
A_callback and B_callback are used as part of the wrapping mechanism but not
|
||||
represented in Python. C is also not represented in Python but is delivered
|
||||
there polymorphically through a smart pointer.
|
||||
|
||||
This is the data structure in Python.
|
||||
|
||||
ExtensionClass<A1>
|
||||
A1: +------------+
|
||||
()<--+- __bases__ |
|
||||
| __dict__ -+->{...}
|
||||
+------------+
|
||||
^
|
||||
| ExtensionInstance
|
||||
| a1: +---------------------+ vec InstanceValueHolder<A1,A_callback>
|
||||
+---------+- __class__ | +---+ +---------------------+
|
||||
| | m_wrapped_objects -+->| *-+-->| contains A_callback |
|
||||
| +---------------------+ +---+ +---------------------+
|
||||
|
|
||||
| ExtensionInstance
|
||||
| pa1_a1: +---------------------+ vec InstancePtrHolder<auto_ptr<A1>,A1>
|
||||
+---------+- __class__ | +---+ +---+
|
||||
| | m_wrapped_objects -+->| *-+-->| *-+-+ A1
|
||||
| +---------------------+ +---+ +---+ | +---+
|
||||
| +->| |
|
||||
| ExtensionInstance +---+
|
||||
| pb1_a1: +---------------------+ vec InstancePtrHolder<auto_ptr<A1>,A1>
|
||||
+---------+- __class__ | +---+ +---+
|
||||
| | m_wrapped_objects -+->| *-+-->| *-+-+ B1
|
||||
| +---------------------+ +---+ +---+ | +---+
|
||||
| +->| |
|
||||
| ExtensionInstance +---+
|
||||
| pb2_a1: +---------------------+ vec InstancePtrHolder<auto_ptr<A1>,A1>
|
||||
+---------+- __class__ | +---+ +---+
|
||||
| | m_wrapped_objects -+->| *-+-->| *-+-+ B2
|
||||
| +---------------------+ +---+ +---+ | +---+
|
||||
| +->| |
|
||||
| +---+
|
||||
| ExtensionClass<A1>
|
||||
| A2: +------------+
|
||||
| ()<--+- __bases__ |
|
||||
| | __dict__ -+->{...}
|
||||
| +------------+
|
||||
| ^
|
||||
| | ExtensionInstance
|
||||
| a2: | +---------------------+ vec InstanceValueHolder<A2>
|
||||
| +-+- __class__ | +---+ +-------------+
|
||||
| | | m_wrapped_objects -+->| *-+-->| contains A2 |
|
||||
| | +---------------------+ +---+ +-------------+
|
||||
| |
|
||||
| | ExtensionInstance
|
||||
| pa2_a2: | +---------------------+ vec InstancePtrHolder<auto_ptr<A2>,A2>
|
||||
| +-+- __class__ | +---+ +---+
|
||||
| | | m_wrapped_objects -+->| *-+-->| *-+-+ A2
|
||||
| | +---------------------+ +---+ +---+ | +---+
|
||||
| | +->| |
|
||||
| | ExtensionInstance +---+
|
||||
| pb1_a2: | +---------------------+ vec InstancePtrHolder<auto_ptr<A2>,A2>
|
||||
| +-+- __class__ | +---+ +---+
|
||||
| | | m_wrapped_objects -+->| *-+-->| *-+-+ B1
|
||||
| | +---------------------+ +---+ +---+ | +---+
|
||||
| | +->| |
|
||||
| | +---+
|
||||
| |
|
||||
| +---------------+------------------------------+
|
||||
| | |
|
||||
+------+-------------------------+-|----------------------------+ |
|
||||
| | | | |
|
||||
| Class<ExtensionInstance> | | ExtensionClass<B1> | | ExtensionClass<B1>
|
||||
| DA1: +------------+ | | B1: +------------+ | | B2: +------------+
|
||||
(*,)<---+- __bases__ | (*,*)<---+- __bases__ | (*,*)<---+- __bases__ |
|
||||
| __dict__ -+->{...} | __dict__ -+->{...} | __dict__ -+->{...}
|
||||
+------------+ +------------+ +------------+
|
||||
^ ^ ^
|
||||
| ExtensionInstance | |
|
||||
| da1: +---------------------+ | vec InstanceValueHolder<A1,A_callback>
|
||||
+-------+- __class__ | | +---+ +---------------------+ |
|
||||
| m_wrapped_objects -+--|-->| *-+-->| contains A_callback | |
|
||||
+---------------------+ | +---+ +---------------------+ |
|
||||
+--------------------------------------+ |
|
||||
| ExtensionInstance |
|
||||
b1: | +---------------------+ vec InstanceValueHolder<B1,B_callback> |
|
||||
+-+- __class__ | +---+ +---------------------+ |
|
||||
| | m_wrapped_objects -+->| *-+-->| contains B_callback | |
|
||||
| +---------------------+ +---+ +---------------------+ |
|
||||
| |
|
||||
| ExtensionInstance |
|
||||
pb1_b1: | +---------------------+ vec InstancePtrHolder<auto_ptr<B1>,B1> |
|
||||
+-+- __class__ | +---+ +---+ |
|
||||
| | m_wrapped_objects -+->| *-+-->| *-+-+ B1 |
|
||||
| +---------------------+ +---+ +---+ | +---+ |
|
||||
| +->| | |
|
||||
| ExtensionInstance +---+ |
|
||||
pc_b1: | +---------------------+ vec InstancePtrHolder<auto_ptr<B1>,B1> |
|
||||
+-+- __class__ | +---+ +---+ |
|
||||
| | m_wrapped_objects -+->| *-+-->| *-+-+ C |
|
||||
| +---------------------+ +---+ +---+ | +---+ |
|
||||
| +->| | |
|
||||
| +---+ |
|
||||
| |
|
||||
| Class<ExtensionInstance> +---------------------------------------+
|
||||
| DB1: +------------+ | ExtensionInstance
|
||||
(*,)<---+- __bases__ | a2: | +---------------------+ vec InstanceValueHolder<A2>
|
||||
| __dict__ -+->{...} +-+- __class__ | +---+ +-------------+
|
||||
+------------+ | m_wrapped_objects -+->| *-+-->| contains A2 |
|
||||
^ +---------------------+ +---+ +-------------+
|
||||
| ExtensionInstance
|
||||
db1: | +---------------------+ vec InstanceValueHolder<B1,B_callback>
|
||||
+-+- __class__ | +---+ +----------------------+
|
||||
| m_wrapped_objects -+-->| *-+-->| contains B1_callback |
|
||||
+---------------------+ +---+ +----------------------+
|
||||
120
doc/enums.html
@@ -1,120 +0,0 @@
|
||||
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0//EN"
|
||||
"http://www.w3.org/TR/REC-html40/strict.dtd">
|
||||
<title>
|
||||
Wrapping enums
|
||||
</title>
|
||||
<div>
|
||||
<h1>
|
||||
<img width="277" height="86" id="_x0000_i1025" align="center"
|
||||
src="../../../c++boost.gif" alt= "c++boost.gif (8819 bytes)"><br>
|
||||
Wrapping enums
|
||||
</h1>
|
||||
|
||||
<p>Because there is in general no way to deduce that a value of arbitrary type T
|
||||
is an enumeration constant, the Boost Python Library cannot automatically
|
||||
convert enum values to and from Python. To handle this case, you need to decide
|
||||
how you want the enum to show up in Python (since Python doesn't have
|
||||
enums). Once you have done that, you can write some simple
|
||||
<code>from_python()</code> and <code>to_python()</code> functions.
|
||||
|
||||
<p>If you are satisfied with a Python int as a way to represent your enum
|
||||
values, we provide a shorthand for these functions. You just need to cause
|
||||
<code>boost::python::enum_as_int_converters<EnumType></code> to be
|
||||
instantiated, where
|
||||
<code>EnumType</code> is your enumerated type. There are two convenient ways to do this:
|
||||
|
||||
<ol>
|
||||
<li>Explicit instantiation:
|
||||
|
||||
<blockquote><pre>
|
||||
template class boost::python::enum_as_int_converters<my_enum>;
|
||||
</blockquote></pre>
|
||||
|
||||
Some buggy C++ implementations require a class to be instantiated in the same
|
||||
namespace in which it is defined. In that case, the simple incantation above becomes:
|
||||
|
||||
<blockquote>
|
||||
<pre>
|
||||
...
|
||||
} // close my_namespace
|
||||
|
||||
// drop into namespace python and explicitly instantiate
|
||||
namespace boost { namespace python {
|
||||
template class enum_as_int_converters<my_enum_type>;
|
||||
}} // namespace boost::python
|
||||
|
||||
namespace my_namespace { // re-open my_namespace
|
||||
...
|
||||
</pre>
|
||||
</blockquote>
|
||||
|
||||
|
||||
<li>If you have such an implementation, you may find this technique more convenient
|
||||
<blockquote><pre>
|
||||
// instantiate as base class in any namespace
|
||||
struct EnumTypeConverters
|
||||
: boost::python::enum_as_int_converters<EnumType>
|
||||
{
|
||||
};
|
||||
</blockquote></pre>
|
||||
</ol>
|
||||
|
||||
<p>Either of the above is equivalent to the following declarations:
|
||||
<blockquote><pre>
|
||||
BOOST_PYTHON_BEGIN_CONVERSION_NAMESPACE // this is a gcc 2.95.2 bug workaround
|
||||
|
||||
MyEnumType from_python(PyObject* x, boost::python::type<MyEnumType>)
|
||||
{
|
||||
return static_cast<MyEnum>(
|
||||
from_python(x, boost::python::type<long>()));
|
||||
}
|
||||
|
||||
MyEnumType from_python(PyObject* x, boost::python::type<const MyEnumType&>)
|
||||
{
|
||||
return static_cast<MyEnum>(
|
||||
from_python(x, boost::python::type<long>()));
|
||||
}
|
||||
|
||||
PyObject* to_python(MyEnumType x)
|
||||
{
|
||||
return to_python(static_cast<long>(x));
|
||||
}
|
||||
BOOST_PYTHON_END_CONVERSION_NAMESPACE
|
||||
</pre></blockquote>
|
||||
|
||||
<p>This technique defines the conversions of
|
||||
<code>MyEnumType</code> in terms of the conversions for the built-in
|
||||
<code>long</code> type.
|
||||
|
||||
You may also want to add a bunch of lines like this to your module
|
||||
initialization. These bind the corresponding enum values to the appropriate
|
||||
names so they can be used from Python:
|
||||
|
||||
<blockquote><pre>
|
||||
mymodule.add(boost::python::make_ref(enum_value_1), "enum_value_1");
|
||||
mymodule.add(boost::python::make_ref(enum_value_2), "enum_value_2");
|
||||
...
|
||||
</pre></blockquote>
|
||||
|
||||
You can also add these to an extension class definition, if your enum happens to
|
||||
be local to a class and you want the analogous interface in Python:
|
||||
|
||||
<blockquote><pre>
|
||||
my_class_builder.add(boost::python::to_python(enum_value_1), "enum_value_1");
|
||||
my_class_builder.add(boost::python::to_python(enum_value_2), "enum_value_2");
|
||||
...
|
||||
</pre></blockquote>
|
||||
<p>
|
||||
Next: <a href="pointers.html">Pointers and Smart Pointers</a>
|
||||
Previous: <a href="building.html">Building an Extension Module</a>
|
||||
Up: <a href="index.html">Top</a>
|
||||
<p>
|
||||
© Copyright David Abrahams 2000. Permission to copy, use, modify,
|
||||
sell and distribute this document is granted provided this copyright
|
||||
notice appears in all copies. This document is provided ``as
|
||||
is'' without express or implied warranty, and with no claim as to
|
||||
its suitability for any purpose.
|
||||
<p>
|
||||
Updated: Mar 6, 2001
|
||||
</div>
|
||||
|
||||
@@ -1,75 +0,0 @@
|
||||
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0//EN"
|
||||
"http://www.w3.org/TR/REC-html40/strict.dtd">
|
||||
<title>
|
||||
A Simple Example
|
||||
</title>
|
||||
<div>
|
||||
<h1>
|
||||
<img width="277" height="86" id="_x0000_i1025" src="../../../c++boost.gif" alt=
|
||||
"c++boost.gif (8819 bytes)">
|
||||
</h1>
|
||||
<h1>
|
||||
A Simple Example
|
||||
</h1>
|
||||
<p>
|
||||
Suppose we have the following C++ API which we want to expose in
|
||||
Python:
|
||||
<blockquote>
|
||||
<pre>
|
||||
#include <string>
|
||||
|
||||
namespace { // Avoid cluttering the global namespace.
|
||||
|
||||
// A couple of simple C++ functions that we want to expose to Python.
|
||||
std::string greet() { return "hello, world"; }
|
||||
int square(int number) { return number * number; }
|
||||
}
|
||||
|
||||
</pre>
|
||||
</blockquote>
|
||||
<p>
|
||||
Here is the C++ code for a python module called <tt>getting_started1</tt>
|
||||
which exposes the API.
|
||||
<blockquote>
|
||||
<pre>
|
||||
#include <boost/python/class_builder.hpp>
|
||||
namespace python = boost::python;
|
||||
|
||||
BOOST_PYTHON_MODULE_INIT(getting_started1)
|
||||
{
|
||||
// Create an object representing this extension module.
|
||||
python::module_builder this_module("getting_started1");
|
||||
|
||||
// Add regular functions to the module.
|
||||
this_module.def(greet, "greet");
|
||||
this_module.def(square, "square");
|
||||
}
|
||||
</pre>
|
||||
</blockquote>
|
||||
<p>
|
||||
That's it! If we build this shared library and put it on our <code>
|
||||
PYTHONPATH</code> we can now access our C++ functions from
|
||||
Python.
|
||||
<blockquote>
|
||||
<pre>
|
||||
>>> import getting_started1
|
||||
>>> print getting_started1.greet()
|
||||
hello, world
|
||||
>>> number = 11
|
||||
>>> print number, '*', number, '=', getting_started1.square(number)
|
||||
11 * 11 = 121
|
||||
</pre>
|
||||
<p>
|
||||
Next: <a href="exporting_classes.html">Exporting Classes</a>
|
||||
Previous: <a href="comparisons.html">Comparisons with other systems</a> Up:
|
||||
<a href="index.html">Top</a>
|
||||
<p>
|
||||
© Copyright David Abrahams 2000. Permission to copy, use, modify,
|
||||
sell and distribute this document is granted provided this copyright
|
||||
notice appears in all copies. This document is provided "as is" without
|
||||
express or implied warranty, and with no claim as to its suitability
|
||||
for any purpose.
|
||||
<p>
|
||||
Updated: Mar 6, 2000
|
||||
</div>
|
||||
|
||||
@@ -1,143 +0,0 @@
|
||||
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0//EN"
|
||||
"http://www.w3.org/TR/REC-html40/strict.dtd">
|
||||
<title>
|
||||
Exporting Classes
|
||||
</title>
|
||||
<div>
|
||||
<h1>
|
||||
<img width="277" height="86" id="_x0000_i1025" src="../../../c++boost.gif" alt=
|
||||
"c++boost.gif (8819 bytes)">
|
||||
</h1>
|
||||
<h1>
|
||||
Exporting Classes
|
||||
</h1>
|
||||
<p>
|
||||
Now let's expose a C++ class to Python:
|
||||
|
||||
<blockquote><pre>
|
||||
#include <iostream>
|
||||
#include <string>
|
||||
|
||||
namespace { // Avoid cluttering the global namespace.
|
||||
|
||||
// A friendly class.
|
||||
class hello
|
||||
{
|
||||
public:
|
||||
hello(const std::string& country) { this->country = country; }
|
||||
std::string greet() const { return "Hello from " + country; }
|
||||
private:
|
||||
std::string country;
|
||||
};
|
||||
|
||||
// A function taking a hello object as an argument.
|
||||
std::string invite(const hello& w) {
|
||||
return w.greet() + "! Please come soon!";
|
||||
}
|
||||
}
|
||||
|
||||
</blockquote></pre> <p>
|
||||
To expose the class, we use a <tt>class_builder</tt> in addition to the
|
||||
<tt>module_builder</tt> from the previous example. Class member functions
|
||||
are exposed by using the <tt>def()</tt> member function on the
|
||||
<tt>class_builder</tt>:
|
||||
<blockquote><pre>
|
||||
#include <boost/python/class_builder.hpp>
|
||||
namespace python = boost::python;
|
||||
|
||||
BOOST_PYTHON_MODULE_INIT(getting_started2)
|
||||
{
|
||||
// Create an object representing this extension module.
|
||||
python::module_builder this_module("getting_started2");
|
||||
|
||||
// Create the Python type object for our extension class.
|
||||
python::class_builder<hello> hello_class(this_module, "hello");
|
||||
|
||||
// Add the __init__ function.
|
||||
hello_class.def(python::constructor<std::string>());
|
||||
// Add a regular member function.
|
||||
hello_class.def(&hello::greet, "greet");
|
||||
|
||||
// Add invite() as a regular function to the module.
|
||||
this_module.def(invite, "invite");
|
||||
|
||||
// Even better, invite() can also be made a member of hello_class!!!
|
||||
hello_class.def(invite, "invite");
|
||||
}
|
||||
</blockquote></pre>
|
||||
<p>
|
||||
Now we can use the class normally from Python:
|
||||
|
||||
<blockquote><pre>
|
||||
>>> from getting_started2 import *
|
||||
>>> hi = hello('California')
|
||||
>>> hi.greet()
|
||||
'Hello from California'
|
||||
>>> invite(hi)
|
||||
'Hello from California! Please come soon!'
|
||||
>>> hi.invite()
|
||||
'Hello from California! Please come soon!'
|
||||
</blockquote></pre>
|
||||
|
||||
Notes:<ul>
|
||||
<li> We expose the class' constructor by calling <tt>def()</tt> on the
|
||||
<tt>class_builder</tt> with an argument whose type is
|
||||
<tt>constructor<</tt><i>params</i><tt>></tt>, where <i>params</i>
|
||||
matches the list of constructor argument types:
|
||||
|
||||
|
||||
<li>Regular member functions are defined by calling <tt>def()</tt> with a
|
||||
member function pointer and its Python name:
|
||||
|
||||
<li>Any function added to a class whose initial argument matches the class (or
|
||||
any base) will act like a member function in Python.
|
||||
|
||||
<li>To define a nested class, just pass the enclosing
|
||||
<tt>class_builder</tt> (instead of a <tt>module_builder</tt>) as the
|
||||
first argument to the nested <tt>class_builder</tt>'s constructor.
|
||||
|
||||
|
||||
</ul>
|
||||
<p>
|
||||
We can even make a subclass of <code>hello.world</code>:
|
||||
|
||||
<blockquote><pre>
|
||||
>>> class wordy(hello):
|
||||
... def greet(self):
|
||||
... return hello.greet(self) + ', where the weather is fine'
|
||||
...
|
||||
>>> hi2 = wordy('Florida')
|
||||
>>> hi2.greet()
|
||||
'Hello from Florida, where the weather is fine'
|
||||
>>> invite(hi2)
|
||||
'Hello from Florida! Please come soon!'
|
||||
</blockquote></pre>
|
||||
<p>
|
||||
Pretty cool! You can't do that with an ordinary Python extension type!
|
||||
|
||||
Of course, you may now have a slightly empty feeling in the pit of
|
||||
your little pythonic stomach. Perhaps you wanted to see the following
|
||||
<tt>wordy</tt> invitation:
|
||||
|
||||
<blockquote><pre>
|
||||
'Hello from Florida, where the weather is fine! Please come soon!'
|
||||
</blockquote></pre>
|
||||
|
||||
After all, <tt>invite</tt> calls <tt>hello::greet()</tt>, and you
|
||||
reimplemented that in your Python subclass, <tt>wordy</tt>. If so, <a
|
||||
href= "overriding.html">read on</a>...
|
||||
|
||||
<p>
|
||||
Next: <a href="overriding.html">Overridable virtual functions</a>
|
||||
Previous: <a href="example1.html">A Simple Example</a> Up:
|
||||
<a href="index.html">Top</a>
|
||||
<p>
|
||||
© Copyright David Abrahams 2000. Permission to copy, use, modify,
|
||||
sell and distribute this document is granted provided this copyright
|
||||
notice appears in all copies. This document is provided "as is" without
|
||||
express or implied warranty, and with no claim as to its suitability
|
||||
for any purpose.
|
||||
<p>
|
||||
Updated: Mar 6, 2001
|
||||
</div>
|
||||
|
||||
@@ -1,73 +0,0 @@
|
||||
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.2//EN">
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
|
||||
<title>
|
||||
A Brief Introduction to writing Python extension modules
|
||||
</title>
|
||||
<h1>
|
||||
<img src="../../../c++boost.gif" alt="c++boost.gif (8819 bytes)" align="center"
|
||||
width="277" height="86">
|
||||
</h1>
|
||||
<h1>
|
||||
A Brief Introduction to writing Python extension modules
|
||||
</h1>
|
||||
<p>
|
||||
Interfacing any language to Python involves building a module which can
|
||||
be loaded by the Python interpreter, but which isn't written in Python.
|
||||
This is known as an <em>extension module</em>. Many of the <a href=
|
||||
"http://www.python.org/doc/current/lib/lib.html">built-in Python
|
||||
libraries</a> are constructed in 'C' this way; Python even supplies its
|
||||
<a href="http://www.python.org/doc/current/lib/types.html">fundamental
|
||||
types</a> using the same mechanism. An extension module can be statically
|
||||
linked with the Python interpreter, but it more commonly resides in a
|
||||
shared library or DLL.
|
||||
<p>
|
||||
As you can see from <a href=
|
||||
"http://www.python.org/doc/current/ext/ext.html"> The Python Extending
|
||||
and Embedding Tutorial</a>, writing an extension module normally means
|
||||
worrying about
|
||||
<ul>
|
||||
<li>
|
||||
<a href="http://www.python.org/doc/current/ext/refcounts.html">
|
||||
maintaining reference counts</a>
|
||||
<li>
|
||||
<a href="http://www.python.org/doc/current/ext/callingPython.html"> how
|
||||
to call back into Python</a>
|
||||
<li>
|
||||
<a href="http://www.python.org/doc/current/ext/parseTuple.html">
|
||||
function argument parsing and typechecking</a>
|
||||
</ul>
|
||||
This last item typically occupies a great deal of code in an extension
|
||||
module. Remember that Python is a completely dynamic language. A callable
|
||||
object receives its arguments in a tuple; it is up to that object to extract
|
||||
those arguments from the tuple, check their types, and raise appropriate
|
||||
exceptions. There are numerous other tedious details that need to be
|
||||
managed; too many to mention here. The Boost Python Library is designed to
|
||||
lift most of that burden.<br>
|
||||
<br>
|
||||
|
||||
<p>
|
||||
Another obstacle that most people run into eventually when extending
|
||||
Python is that there's no way to make a true Python class in an extension
|
||||
module. The typical solution is to create a new Python type in the
|
||||
extension module, and then write an additional module in 100% Python. The
|
||||
Python module defines a Python class which dispatches to an instance of
|
||||
the extension type, which it contains. This allows users to write
|
||||
subclasses of the class in the Python module, almost as though they were
|
||||
sublcassing the extension type. Aside from being tedious, it's not really
|
||||
the same as having a true class, because there's no way for the user to
|
||||
override a method of the extension type which is called from the
|
||||
extension module. Boost.Python solves this problem by taking advantage of <a
|
||||
href="http://www.python.org/doc/essays/metaclasses/">Python's metaclass
|
||||
feature</a> to provide objects which look, walk, and hiss almost exactly
|
||||
like regular Python classes. Boost.Python classes are actually cleaner than
|
||||
Python classes in some subtle ways; a more detailed discussion will
|
||||
follow (someday).</p>
|
||||
<p>Next: <a href="comparisons.html">Comparisons with Other Systems</a> Up: <a
|
||||
href="index.html">Top</a> </p>
|
||||
<p>
|
||||
© Copyright David Abrahams 2000. Permission to copy, use, modify,
|
||||
sell and distribute this document is granted provided this copyright
|
||||
notice appears in all copies. This document is provided "as is" without
|
||||
express or implied warranty, and with no claim as to its suitability for
|
||||
any purpose.</p>
|
||||
|
||||
282
doc/index.html
@@ -1,205 +1,129 @@
|
||||
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0//EN"
|
||||
"http://www.w3.org/TR/REC-html40/strict.dtd">
|
||||
<title>
|
||||
The Boost Python Library (Boost.Python)
|
||||
</title>
|
||||
<h1>
|
||||
<img src="../../../c++boost.gif" alt="c++boost.gif (8819 bytes)" width="277"
|
||||
align="center" height="86"><br>The Boost Python Library (Boost.Python)
|
||||
</h1>
|
||||
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
|
||||
|
||||
<h2>Synopsis</h2>
|
||||
<p>
|
||||
Use the Boost Python Library to quickly and easily export a C++ library to <a
|
||||
href="http://www.python.org">Python</a> such that the Python interface is
|
||||
very similar to the C++ interface. It is designed to be minimally
|
||||
intrusive on your C++ design. In most cases, you should not have to alter
|
||||
your C++ classes in any way in order to use them with Boost.Python. The system
|
||||
<em>should</em> simply ``reflect'' your C++ classes and functions into
|
||||
Python.
|
||||
<html>
|
||||
<head>
|
||||
<meta name="generator" content=
|
||||
"HTML Tidy for Windows (vers 1st August 2002), see www.w3.org">
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<link rel="stylesheet" type="text/css" href="boost.css">
|
||||
|
||||
<p>
|
||||
<title>Boost.Python</title>
|
||||
</head>
|
||||
|
||||
<table border="1">
|
||||
<tr><td> <b>Note:</b> this is the last official release of
|
||||
Boost.Python v1. Development of this version of the library has
|
||||
stopped; it will be retired soon in favor of the redesigned and
|
||||
improved version 2. A summary of the development goals is available on
|
||||
the Python <a href="http://www.python.org/sigs/c++-sig/">C++-sig</a>
|
||||
page, which also serves as a mailing list for users of both versions
|
||||
of the library. A preview of the v2 documentation is available <a
|
||||
href="http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/*checkout*/boost/boost/libs/python/doc/v2/index.html?rev=HEAD&content-type=text/html">here</a>,
|
||||
and instructions for getting started with a prerelease are available
|
||||
upon request.
|
||||
</table>
|
||||
<body link="#0000ff" vlink="#800080">
|
||||
<table border="0" cellpadding="7" cellspacing="0" width="100%" summary=
|
||||
"header">
|
||||
<tr>
|
||||
<td valign="top" width="300">
|
||||
<h3><a href="../../../index.htm"><img height="86" width="277" alt=
|
||||
"C++ Boost" src="../../../boost.png" border="0"></a></h3>
|
||||
</td>
|
||||
|
||||
<h2>Supported Platforms</h2>
|
||||
<p>Boost.Python is known to have been tested
|
||||
against <a href="http://www.python/org/2.2.1">Python 2.2.1</a> using
|
||||
the following compilers:
|
||||
<td valign="top">
|
||||
<h1 align="center">Boost.Python</h1>
|
||||
|
||||
<ul>
|
||||
<li><a
|
||||
href="http://msdn.microsoft.com/vstudio/downloads/updates/sp/vs6/sp5/default.asp">MSVC++6sp5</a>.
|
||||
All tests pass.
|
||||
<h2 align="center">Index</h2>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
<hr>
|
||||
|
||||
<li><a
|
||||
href="http://msdn.microsoft.com/vstudio/downloads/updates/sp/vs6/sp5/default.asp">MSVC++6sp5</a>
|
||||
with <a href="http://www.stlport.org">STLPort</a>-4.5.3. A compiler bug interferes with
|
||||
<a
|
||||
href="../example/simple_vector.cpp">libs/python/example/simple_vector.cpp</a>. All
|
||||
other tests pass.
|
||||
<h2>Synopsis</h2>
|
||||
Welcome to version 2 of <b>Boost.Python</b>, a C++ library which enables
|
||||
seamless interoperability between C++ and the <a href=
|
||||
"http://www.python.org">Python</a> programming language. The new version
|
||||
has been rewritten from the ground up, with a more convenient and
|
||||
flexible interface, and many new capabilities, including support for:
|
||||
|
||||
<p>
|
||||
<li><a href="http://msdn.microsoft.com/visualc/">MSVC++7 (Visual
|
||||
Studio .NET)</a>. All tests pass.
|
||||
<ul>
|
||||
<li>References and Pointers</li>
|
||||
|
||||
<p>
|
||||
<li><a href="http://www.metrowerks.com/products/windows/">Metrowerks
|
||||
CodeWarrior Pro7.2 and Pro7.0 for Windows</a>. All tests pass.
|
||||
<li>Globally Registered Type Coercions</li>
|
||||
|
||||
<p>
|
||||
<li><a href="http://gcc.gnu.org">GCC 3.0.4</a> under <a
|
||||
href="http://www.cygwin.com">Cygwin</a> and
|
||||
<a href="http://www.redhat.com/">RedHat Linux 7.1</a>.
|
||||
All tests pass.
|
||||
<li>Automatic Cross-Module Type Conversions</li>
|
||||
|
||||
<p>
|
||||
<li>Compaq C++ V6.2-024 for Digital UNIX (an <a
|
||||
href="http://www.edg.com/">EDG</a>-based compiler).
|
||||
All tests pass.<br>
|
||||
Note that the Boost.Compatibility
|
||||
library must be included (see e.g. tru64_cxx.mak in the build
|
||||
directory).
|
||||
<li>Efficient Function Overloading</li>
|
||||
|
||||
<p>
|
||||
<li>Silicon Graphics MIPSpro Version 7.3.1.2m (an <a
|
||||
href="http://www.edg.com/">EDG</a>-based compiler).
|
||||
All tests pass.<br>
|
||||
Note that the Boost.Compatibility
|
||||
library must be included (see e.g. irix_CC.mak in the build
|
||||
directory).
|
||||
<li>C++ to Python Exception Translation</li>
|
||||
|
||||
<p>
|
||||
<li><a href="http://gcc.gnu.org">GCC 2.95.2</a> under <a
|
||||
href="http://www.mingw.org">MinGW</a> and <a
|
||||
href="http://www.redhat.com/">RedHat Linux 7.1</a>.
|
||||
Compilation succeeds, but some tests fail at runtime due to
|
||||
exception handling bugs. It is therefore highly recommended
|
||||
to use GCC 3.0.4 instead.
|
||||
<li>Default Arguments</li>
|
||||
|
||||
<p>
|
||||
<li><a
|
||||
href="http://developer.intel.com/software/products/compilers/c50/">Intel
|
||||
C++ 6.0</a> beta: Comprehensive test fails to link due to a
|
||||
linker bug. Other tests seem to work.
|
||||
<li>Keyword Arguments</li>
|
||||
|
||||
<p>
|
||||
<li><a
|
||||
href="http://developer.intel.com/software/products/compilers/c50/">Intel
|
||||
C++ 5.0</a> Comprehensive test fails at runtime due to an
|
||||
exception-handling bug. Other tests seem to work.
|
||||
<li>Manipulating Python objects in C++</li>
|
||||
|
||||
</ul>
|
||||
<li>Exporting C++ Iterators as Python Iterators</li>
|
||||
|
||||
<p>
|
||||
Note that pickling doesn't work with Python 2.2
|
||||
due to a core language bug. This is fixed in
|
||||
<a href="http://www.python/org/2.2.1">2.2.1</a>.
|
||||
<li>Documentation Strings</li>
|
||||
</ul>
|
||||
The development of these features was funded in part by grants to <a
|
||||
href="http://www.boost-consulting.com">Boost Consulting</a> from the <a
|
||||
href="http://www.llnl.gov/">Lawrence Livermore National Laboratories</a>
|
||||
and by the <a href="http://cci.lbl.gov/">Computational Crystallography
|
||||
Initiative</a> at Lawrence Berkeley National Laboratories.
|
||||
|
||||
<p>
|
||||
Boost.Python has also been used with other versions of Python back to
|
||||
Python 1.5.2. It is expected that the older Python releases still work,
|
||||
but we are not regularly testing for backward compatibility.
|
||||
<hr>
|
||||
|
||||
<h2>Credits</h2>
|
||||
<ul>
|
||||
<li><a href="../../../people/dave_abrahams.htm">David Abrahams</a> originated
|
||||
and wrote most of the library, and continues to coordinate development.
|
||||
<h2>Contents</h2>
|
||||
|
||||
<li><a href="mailto:koethe@informatik.uni-hamburg.de">Ullrich Koethe</a>
|
||||
had independently developed a similar system. When he discovered Boost.Python,
|
||||
he generously contributed countless hours of coding and much insight into
|
||||
improving it. He is responsible for an early version of the support for <a
|
||||
href="overloading.html">function overloading</a> and wrote the support for
|
||||
<a href="inheritance.html#implicit_conversion">reflecting C++ inheritance
|
||||
relationships</a>. He has helped to improve error-reporting from both
|
||||
Python and C++, and has designed an extremely easy-to-use way of
|
||||
exposing <a href="special.html#numeric">numeric operators</a>, including
|
||||
a way to avoid explicit coercion by means of overloading.
|
||||
<dl class="index">
|
||||
<dt><a href="tutorial/index.html">Tutorial Introduction</a></dt>
|
||||
|
||||
<dt><a href="building.html">Building and Testing</a></dt>
|
||||
|
||||
<dt><a href="v2/reference.html">Reference Manual</a></dt>
|
||||
|
||||
<dt>Suites:</dt>
|
||||
<dd>
|
||||
<ul>
|
||||
<li><a href="v2/pickle.html">Pickle</a></li>
|
||||
<li><a href="v2/indexing.html">Indexing</a></li>
|
||||
</ul>
|
||||
</dd>
|
||||
|
||||
<dt><a href="v2/configuration.html">Configuration Information</a></dt>
|
||||
|
||||
<dt><a href="v2/platforms.html">Known Working Platforms and
|
||||
Compilers</a></dt>
|
||||
|
||||
<dt><a href="v2/definitions.html">Definitions</a></dt>
|
||||
|
||||
<dt><a href="projects.html">Projects using Boost.Python</a></dt>
|
||||
|
||||
<dt><a href="support.html">Support Resources</a></dt>
|
||||
|
||||
<dt><a href="v2/faq.html">Frequently Asked Questions (FAQs)</a></dt>
|
||||
|
||||
<li><a href="http://cci.lbl.gov/staff/ralf_grosse-kunstleve.html">Ralf W.
|
||||
Grosse-Kunstleve</a> contributed <a href="pickle.html">pickle support</a>
|
||||
and numerous other small improvements. He's working on a way to allow
|
||||
types exported by multiple modules to interact.
|
||||
<dt><a href="../pyste/index.html">Pyste (Boost.Python code generator)</a></dt>
|
||||
|
||||
<li>The members of the boost mailing list and the Python community
|
||||
supplied invaluable early feedback. In particular, Ron Clarke, Mark Evans,
|
||||
Anton Gluck, Chuck Ingold, Prabhu Ramachandran, and Barry Scott took the
|
||||
brave step of trying to use Boost.Python while it was still in early
|
||||
stages of development.
|
||||
<dt><a href="internals.html">Internals Documentation</a></dt>
|
||||
|
||||
<li>The development of Boost.Python wouldn't have been possible without
|
||||
the generous support of <a href="http://www.dragonsys.com/">Dragon
|
||||
Systems/Lernout and Hauspie, Inc</a> who supported its development as an
|
||||
open-source project.
|
||||
</ul>
|
||||
|
||||
<h2>Table of Contents</h2>
|
||||
|
||||
<ol>
|
||||
<li><a href="extending.html">A Brief Introduction to writing Python
|
||||
extension modules</a>
|
||||
|
||||
<li><a href="comparisons.html">Comparisons between Boost.Python and other
|
||||
systems for extending Python</a>
|
||||
|
||||
<li><a href="example1.html">A Simple Example</a>
|
||||
|
||||
<li><a href="exporting_classes.html">Exporting Classes</a>
|
||||
|
||||
<li><a href="overriding.html">Overridable Virtual Functions</a>
|
||||
|
||||
<li><a href="overloading.html">Function Overloading</a>
|
||||
|
||||
<li><a href="inheritance.html">Inheritance</a>
|
||||
|
||||
<li><a href="special.html">Special Method and Operator Support</a>
|
||||
|
||||
<li><a href="under-the-hood.html">A Peek Under the Hood</a>
|
||||
|
||||
<li><a href="building.html">Building an Extension Module</a>
|
||||
|
||||
<li><a href="pickle.html">Pickle Support</a>
|
||||
|
||||
<li><a href="cross_module.html">Cross-Extension-Module Dependencies</a>
|
||||
|
||||
<li><a href="enums.html">Wrapping Enums</a>
|
||||
|
||||
<li><a href="pointers.html">Pointers and Smart Pointers</a>
|
||||
|
||||
<li><a href="data_structures.txt">Internal Data Structures</a>
|
||||
|
||||
</ol>
|
||||
<dt><a href="news.html">News/Change Log</a></dt>
|
||||
|
||||
<p>
|
||||
Documentation is a major ongoing project; assistance is greatly
|
||||
appreciated! In the meantime, useful examples of every Boost.Python feature should
|
||||
be evident in the regression test files <code>test/comprehensive.[<a
|
||||
href="../test/comprehensive.py">py</a>/<a
|
||||
href="../test/comprehensive.hpp">hpp</a>/<a
|
||||
href="../test/comprehensive.cpp">cpp</a>]</code>
|
||||
<dt><a href="../todo.html">TODO list</a></dt>
|
||||
|
||||
<p>
|
||||
Questions should be directed to the <a href=
|
||||
"http://www.python.org/sigs/c++-sig/">Python C++ SIG</a>.
|
||||
<dt><a href="v2/progress_reports.html">LLNL Progress Reports</a></dt>
|
||||
|
||||
<p>
|
||||
© Copyright David Abrahams 2001. Permission to copy, use, modify,
|
||||
sell and distribute this document is granted provided this copyright
|
||||
notice appears in all copies. This document is provided ``as is'' without
|
||||
express or implied warranty, and with no claim as to its suitability for
|
||||
any purpose.
|
||||
<p>
|
||||
Updated: Apr 2002
|
||||
<dt><a href="v2/acknowledgments.html">Acknowledgments</a></dt>
|
||||
</dl>
|
||||
<hr>
|
||||
|
||||
<h2>Articles</h2>
|
||||
|
||||
"<a href="PyConDC_2003/bpl.html">Building Hybrid
|
||||
Systems With Boost Python</a>", by Dave Abrahams and Ralf
|
||||
W. Grosse-Kunstleve (<a href="PyConDC_2003/bpl.pdf">PDF</a>)
|
||||
|
||||
<hr>
|
||||
|
||||
<p>Revised
|
||||
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
|
||||
26 August, 2003
|
||||
<!--webbot bot="Timestamp" endspan i-checksum="39359" -->
|
||||
</p>
|
||||
|
||||
<p><i>© Copyright <a href="../../../people/dave_abrahams.htm">Dave
|
||||
Abrahams</a> 2002-2003.</i></p>
|
||||
</body>
|
||||
</html>
|
||||
|
||||
|
||||
@@ -1,166 +0,0 @@
|
||||
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0//EN"
|
||||
"http://www.w3.org/TR/REC-html40/strict.dtd">
|
||||
<title>
|
||||
Inheritance
|
||||
</title>
|
||||
<div>
|
||||
<h1>
|
||||
<img width="277" height="86" id="_x0000_i1025" align="center"
|
||||
src="../../../c++boost.gif" alt= "c++boost.gif (8819 bytes)">Inheritance
|
||||
</h1>
|
||||
|
||||
<h2>Inheritance in Python</h2>
|
||||
|
||||
<p>
|
||||
Boost.Python extension classes support single and multiple-inheritance in
|
||||
Python, just like regular Python classes. You can arbitrarily mix
|
||||
built-in Python classes with extension classes in a derived class'
|
||||
tuple of bases. Whenever a Boost.Python extension class is among the bases for a
|
||||
new class in Python, the result is an extension class:
|
||||
<blockquote>
|
||||
<pre>
|
||||
>>> class MyPythonClass:
|
||||
... def f(): return 'MyPythonClass.f()'
|
||||
...
|
||||
>>> import my_extension_module
|
||||
>>> class Derived(my_extension_module.MyExtensionClass, MyPythonClass):
|
||||
... '''This is an extension class'''
|
||||
... pass
|
||||
...
|
||||
>>> x = Derived()
|
||||
>>> x.f()
|
||||
'MyPythonClass.f()'
|
||||
>>> x.g()
|
||||
'MyExtensionClass.g()'
|
||||
</pre>
|
||||
</blockquote>
|
||||
|
||||
<h2><a name="implicit_conversion">Reflecting C++ Inheritance Relationships</a></h2>
|
||||
<p>
|
||||
Boost.Python also allows us to represent C++ inheritance relationships so that
|
||||
wrapped derived classes may be passed where values, pointers, or
|
||||
references to a base class are expected as arguments. The
|
||||
<code>declare_base</code> member function of
|
||||
<code>class_builder<></code> is used to establish the relationship
|
||||
between base and derived classes:
|
||||
|
||||
<blockquote>
|
||||
<pre>
|
||||
#include <memory> // for std::auto_ptr<>
|
||||
|
||||
struct Base {
|
||||
virtual ~Base() {}
|
||||
virtual const char* name() const { return "Base"; }
|
||||
};
|
||||
|
||||
struct Derived : Base {
|
||||
Derived() : x(-1) {}
|
||||
virtual const char* name() const { return "Derived"; }
|
||||
int x;
|
||||
};
|
||||
|
||||
std::auto_ptr<Base> derived_as_base() {
|
||||
return std::auto_ptr<Base>(new Derived);
|
||||
}
|
||||
|
||||
const char* get_name(const Base& b) {
|
||||
return b.name();
|
||||
}
|
||||
|
||||
int get_derived_x(const Derived& d) {
|
||||
return d.x;
|
||||
}
|
||||
<hr>
|
||||
#include <boost/python/class_builder.hpp>
|
||||
|
||||
// namespace alias for code brevity
|
||||
namespace python = boost::python;
|
||||
|
||||
BOOST_PYTHON_MODULE_INIT(my_module)
|
||||
{
|
||||
python::module_builder my_module("my_module");
|
||||
|
||||
python::class_builder<Base> base_class(my_module, "Base");
|
||||
base_class.def(python::constructor<>());
|
||||
|
||||
python::class_builder<Derived> derived_class(my_module, "Derived");
|
||||
derived_class.def(python::constructor<>());
|
||||
<b>// Establish the inheritance relationship between Base and Derived
|
||||
derived_class.declare_base(base_class);</b>
|
||||
|
||||
my_module.def(derived_as_base, "derived_as_base");
|
||||
my_module.def(get_name, "get_name");
|
||||
my_module.def(get_derived_x, "get_derived_x");
|
||||
}
|
||||
</pre>
|
||||
</blockquote>
|
||||
|
||||
<p>
|
||||
Then, in Python:
|
||||
<blockquote>
|
||||
<pre>
|
||||
>>> from my_module import *
|
||||
>>> base = Base()
|
||||
>>> derived = Derived()
|
||||
>>> get_name(base)
|
||||
'Base'
|
||||
</pre>
|
||||
</blockquote>
|
||||
<i>objects of wrapped class Derived may be passed where Base is expected</i>
|
||||
<blockquote>
|
||||
<pre>
|
||||
>>> get_name(derived)
|
||||
'Derived'
|
||||
</pre>
|
||||
</blockquote>
|
||||
<i>objects of wrapped class Derived can be passed where Derived is
|
||||
expected but where type information has been lost.</i>
|
||||
<blockquote>
|
||||
<pre>
|
||||
>>> get_derived_x(derived_as_base())
|
||||
-1
|
||||
</pre>
|
||||
</blockquote>
|
||||
|
||||
<h2>Inheritance Without Virtual Functions</h2>
|
||||
|
||||
<p>
|
||||
If for some reason your base class has no virtual functions but you still want
|
||||
to represent the inheritance relationship between base and derived classes,
|
||||
pass the special symbol <code>boost::python::without_downcast</code> as the 2nd parameter
|
||||
to <code>declare_base</code>:
|
||||
|
||||
<blockquote>
|
||||
<pre>
|
||||
struct Base2 {};
|
||||
struct Derived2 { int f(); };
|
||||
<hr>
|
||||
...
|
||||
python::class_builder<Base> base2_class(my_module, "Base2");
|
||||
base2_class.def(python::constructor<>());
|
||||
|
||||
python::class_builder<Derived2> derived2_class(my_module, "Derived2");
|
||||
derived2_class.def(python::constructor<>());
|
||||
derived_class.declare_base(base_class, <b>python::without_downcast</b>);
|
||||
</pre>
|
||||
</blockquote>
|
||||
|
||||
<p>This approach will allow <code>Derived2</code> objects to be passed where
|
||||
<code>Base2</code> is expected, but does not attempt to implicitly convert (downcast)
|
||||
smart-pointers to <code>Base2</code> into <code>Derived2</code> pointers,
|
||||
references, or values.
|
||||
|
||||
<p>
|
||||
Next: <a href="special.html">Special Method and Operator Support</a>
|
||||
Previous: <a href="overloading.html">Function Overloading</a>
|
||||
Up: <a href="index.html">Top</a>
|
||||
<p>
|
||||
© Copyright David Abrahams 2000. Permission to copy, use, modify,
|
||||
sell and distribute this document is granted provided this copyright
|
||||
notice appears in all copies. This document is provided "as is" without
|
||||
express or implied warranty, and with no claim as to its suitability
|
||||
for any purpose.
|
||||
<p>
|
||||
Updated: Nov 26, 2000
|
||||
</div>
|
||||
|
||||
186
doc/internals.html
Executable file
@@ -0,0 +1,186 @@
|
||||
<?xml version="1.0" encoding="utf-8" ?>
|
||||
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
|
||||
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
|
||||
<head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
|
||||
<meta name="generator" content="Docutils 0.3.0: http://docutils.sourceforge.net/" />
|
||||
<title>Boost.Python Internals Boost</title>
|
||||
<link rel="stylesheet" href="../../../rst.css" type="text/css" />
|
||||
</head>
|
||||
<body>
|
||||
<div class="document" id="boost-python-internals-logo">
|
||||
<h1 class="title"><a class="reference" href="index.html">Boost.Python</a> Internals <a class="reference" href="../../../index.htm"><img alt="Boost" src="../../../boost.png" /></a></h1>
|
||||
<div class="section" id="a-conversation-between-brett-calcott-and-david-abrahams">
|
||||
<h1><a name="a-conversation-between-brett-calcott-and-david-abrahams">A conversation between Brett Calcott and David Abrahams</a></h1>
|
||||
<table class="field-list" frame="void" rules="none">
|
||||
<col class="field-name" />
|
||||
<col class="field-body" />
|
||||
<tbody valign="top">
|
||||
<tr class="field"><th class="field-name">copyright:</th><td class="field-body">Copyright David Abrahams and Brett Calcott 2003. See
|
||||
accompanying <a class="reference" href="../../../LICENSE_1_0.txt">license</a> for terms of use.</td>
|
||||
</tr>
|
||||
</tbody>
|
||||
</table>
|
||||
<p>In both of these cases, I'm quite capable of reading code - but the
|
||||
thing I don't get from scanning the source is a sense of the
|
||||
architecture, both structurally, and temporally (er, I mean in what
|
||||
order things go on).</p>
|
||||
<ol class="arabic">
|
||||
<li><p class="first">What happens when you do the following:</p>
|
||||
<pre class="literal-block">
|
||||
struct boring {};
|
||||
...etc...
|
||||
class_<boring>("boring")
|
||||
;
|
||||
</pre>
|
||||
</li>
|
||||
</ol>
|
||||
<p>There seems to be a fair bit going on.</p>
|
||||
<blockquote>
|
||||
<ul class="simple">
|
||||
<li>Python needs a new ClassType to be registered.</li>
|
||||
<li>We need to construct a new type that can hold our boring struct.</li>
|
||||
<li>Inward and outward converters need to be registered for the type.</li>
|
||||
</ul>
|
||||
</blockquote>
|
||||
<p>Can you gesture in the general direction where these things are done?</p>
|
||||
<blockquote>
|
||||
<p>I only have time for a "off-the-top-of-my-head" answer at the moment;
|
||||
I suggest you step through the code with a debugger after reading this
|
||||
to see how it works, fill in details, and make sure I didn't forget
|
||||
anything.</p>
|
||||
<blockquote>
|
||||
<p>A new (Python) subclass of Boost.Python.Instance (see
|
||||
libs/python/src/object/class.cpp) is created by invoking
|
||||
Boost.Python.class, the metatype:</p>
|
||||
<pre class="literal-block">
|
||||
>>> boring = Boost.Python.class(
|
||||
... 'boring'
|
||||
... , bases_tuple # in this case, just ()
|
||||
... , {
|
||||
... '__module__' : module_name
|
||||
... , '__doc__' : doc_string # optional
|
||||
... }
|
||||
... )
|
||||
</pre>
|
||||
<p>A handle to this object is stuck in the m_class_object field
|
||||
of the registration associated with <tt class="literal"><span class="pre">typeid(boring)</span></tt>. The
|
||||
registry will keep that object alive forever, even if you
|
||||
wipe out the 'boring' attribute of the extension module
|
||||
(probably not a good thing).</p>
|
||||
<p>Because you didn't specify <tt class="literal"><span class="pre">class<boring,</span> <span class="pre">non_copyable,</span>
|
||||
<span class="pre">...></span></tt>, a to-python converter for boring is registered which
|
||||
copies its argument into a value_holder held by the the
|
||||
Python boring object.</p>
|
||||
<p>Because you didn't specify <tt class="literal"><span class="pre">class<boring</span> <span class="pre">...>(no_init)</span></tt>,
|
||||
an <tt class="literal"><span class="pre">__init__</span></tt> function object is added to the class
|
||||
dictionary which default-constructs a boring in a
|
||||
value_holder (because you didn't specify some smart pointer
|
||||
or derived wrapper class as a holder) held by the Python
|
||||
boring object.</p>
|
||||
<p><tt class="literal"><span class="pre">register_class_from_python</span></tt> is used to register a
|
||||
from-python converter for <tt class="literal"><span class="pre">shared_ptr<boring></span></tt>.
|
||||
<tt class="literal"><span class="pre">boost::shared_ptr</span></tt>s are special among smart pointers
|
||||
because their Deleter argument can be made to manage the
|
||||
whole Python object, not just the C++ object it contains, no
|
||||
matter how the C++ object is held.</p>
|
||||
<p>If there were any <tt class="literal"><span class="pre">bases<></span></tt>, we'd also be registering the
|
||||
relationship between these base classes and boring in the
|
||||
up/down cast graph (<tt class="literal"><span class="pre">inheritance.[hpp/cpp]</span></tt>).</p>
|
||||
<p>In earlier versions of the code, we'd be registering lvalue
|
||||
from-python converters for the class here, but now
|
||||
from-python conversion for wrapped classes is handled as a
|
||||
special case, before consulting the registry, if the source
|
||||
Python object's metaclass is the Boost.Python metaclass.</p>
|
||||
<p>Hmm, that from-python converter probably ought to be handled
|
||||
the way class converters are, with no explicit conversions
|
||||
registered.</p>
|
||||
</blockquote>
|
||||
</blockquote>
|
||||
<ol class="arabic" start="2">
|
||||
<li><p class="first">Can you give a brief overview of the data structures that are
|
||||
present in the registry</p>
|
||||
<blockquote>
|
||||
<p>The registry is simple: it's just a map from typeid ->
|
||||
registration (see boost/python/converter/registrations.hpp).
|
||||
<tt class="literal"><span class="pre">lvalue_chain</span></tt> and <tt class="literal"><span class="pre">rvalue_chain</span></tt> are simple endogenous
|
||||
linked lists.</p>
|
||||
<p>If you want to know more, just ask.</p>
|
||||
<p>If you want to know about the cast graph, ask me something specific in
|
||||
a separate message.</p>
|
||||
</blockquote>
|
||||
<p>and an overview of the process that happens as a type makes its
|
||||
way from c++ to python and back again.</p>
|
||||
</li>
|
||||
</ol>
|
||||
<blockquote>
|
||||
<p>Big subject. I suggest some background reading: look for relevant
|
||||
info in the LLNL progress reports and the messages they link to.
|
||||
Also,</p>
|
||||
<blockquote>
|
||||
<p><a class="reference" href="http://mail.python.org/pipermail/c++-sig/2002-May/001023.html">http://mail.python.org/pipermail/c++-sig/2002-May/001023.html</a></p>
|
||||
<p><a class="reference" href="http://mail.python.org/pipermail/c++-sig/2002-December/003115.html">http://mail.python.org/pipermail/c++-sig/2002-December/003115.html</a></p>
|
||||
<p><a class="reference" href="http://aspn.activestate.com/ASPN/Mail/Message/1280898">http://aspn.activestate.com/ASPN/Mail/Message/1280898</a></p>
|
||||
<p><a class="reference" href="http://mail.python.org/pipermail/c++-sig/2002-July/001755.html">http://mail.python.org/pipermail/c++-sig/2002-July/001755.html</a></p>
|
||||
</blockquote>
|
||||
<p>from c++ to python:</p>
|
||||
<blockquote>
|
||||
<p>It depends on the type and the call policies in use or, for
|
||||
<tt class="literal"><span class="pre">call<>(...)</span></tt>, <tt class="literal"><span class="pre">call_method<>(...)</span></tt>, or <tt class="literal"><span class="pre">object(...)</span></tt>, if
|
||||
<tt class="literal"><span class="pre">ref</span></tt> or <tt class="literal"><span class="pre">ptr</span></tt> is used. There are also two basic
|
||||
categories to to-python conversion, "return value" conversion
|
||||
(for Python->C++ calls) and "argument" conversion (for
|
||||
C++->Python calls and explicit <tt class="literal"><span class="pre">object()</span></tt> conversions). The
|
||||
behavior of these two categories differs subtly in various ways
|
||||
whose details I forget at the moment. You can probably find
|
||||
the answers in the above references, and certainly in the code.</p>
|
||||
<p>The "default" case is by-value (copying) conversion, which uses
|
||||
to_python_value as a to-python converter.</p>
|
||||
<blockquote>
|
||||
<p>Since there can sensibly be only one way to convert any type
|
||||
to python (disregarding the idea of scoped registries for the
|
||||
moment), it makes sense that to-python conversions can be
|
||||
handled by specializing a template. If the type is one of
|
||||
the types handled by a built-in conversion
|
||||
(builtin_converters.hpp), the corresponding template
|
||||
specialization of to_python_value gets used.</p>
|
||||
<p>Otherwise, to_python_value uses the <tt class="literal"><span class="pre">m_to_python</span></tt>
|
||||
function in the registration for the C++ type.</p>
|
||||
</blockquote>
|
||||
<p>Other conversions, like by-reference conversions, are only
|
||||
available for wrapped classes, and are requested explicitly by
|
||||
using <tt class="literal"><span class="pre">ref(...)</span></tt>, <tt class="literal"><span class="pre">ptr(...)</span></tt>, or by specifying different
|
||||
CallPolicies for a call, which can cause a different to-python
|
||||
converter to be used. These conversions are never registered
|
||||
anywhere, though they do need to use the registration to find
|
||||
the Python class corresponding to the C++ type being referred
|
||||
to. They just build a new Python instance and stick the
|
||||
appropriate Holder instance in it.</p>
|
||||
</blockquote>
|
||||
<p>from python to C++:</p>
|
||||
<blockquote>
|
||||
<p>Once again I think there is a distinction between "return value"
|
||||
and "argument" conversions, and I forget exactly what that is.</p>
|
||||
<p>What happens depends on whether an lvalue conversion is needed
|
||||
(see <a class="reference" href="http://mail.python.org/pipermail/c++-sig/2002-May/001023.html">http://mail.python.org/pipermail/c++-sig/2002-May/001023.html</a>)
|
||||
All lvalue conversions are also registered in a type's rvalue
|
||||
conversion chain, since when an rvalue will do, an lvalue is
|
||||
certainly good enough.</p>
|
||||
<p>An lvalue conversion can be done in one step (just get me the
|
||||
pointer to the object - it can be <tt class="literal"><span class="pre">NULL</span></tt> if no conversion is
|
||||
possible) while an rvalue conversion requires two steps to
|
||||
support wrapped function overloading and multiple converters for
|
||||
a given C++ target type: first tell me if a conversion is
|
||||
possible, then construct the converted object as a second step.</p>
|
||||
</blockquote>
|
||||
</blockquote>
|
||||
</div>
|
||||
</div>
|
||||
<hr class="footer"/>
|
||||
<div class="footer">
|
||||
<a class="reference" href="internals.rst">View document source</a>.
|
||||
Generated on: 2003-09-12 14:51 UTC.
|
||||
Generated by <a class="reference" href="http://docutils.sourceforge.net/">Docutils</a> from <a class="reference" href="http://docutils.sourceforge.net/rst.html">reStructuredText</a> source.
|
||||
</div>
|
||||
</body>
|
||||
</html>
|
||||
182
doc/internals.rst
Executable file
@@ -0,0 +1,182 @@
|
||||
===================================
|
||||
Boost.Python_ Internals |(logo)|__
|
||||
===================================
|
||||
|
||||
.. |(logo)| image:: ../../../boost.png
|
||||
:alt: Boost
|
||||
:class: boost-logo
|
||||
|
||||
__ ../../../index.htm
|
||||
|
||||
.. _`Boost.Python`: index.html
|
||||
|
||||
.. _license: ../../../LICENSE_1_0.txt
|
||||
|
||||
|
||||
-------------------------------------------------------
|
||||
A conversation between Brett Calcott and David Abrahams
|
||||
-------------------------------------------------------
|
||||
|
||||
:copyright: Copyright David Abrahams and Brett Calcott 2003. See
|
||||
accompanying license_ for terms of use.
|
||||
|
||||
In both of these cases, I'm quite capable of reading code - but the
|
||||
thing I don't get from scanning the source is a sense of the
|
||||
architecture, both structurally, and temporally (er, I mean in what
|
||||
order things go on).
|
||||
|
||||
1) What happens when you do the following::
|
||||
|
||||
struct boring {};
|
||||
...etc...
|
||||
class_<boring>("boring")
|
||||
;
|
||||
|
||||
There seems to be a fair bit going on.
|
||||
|
||||
- Python needs a new ClassType to be registered.
|
||||
- We need to construct a new type that can hold our boring struct.
|
||||
- Inward and outward converters need to be registered for the type.
|
||||
|
||||
Can you gesture in the general direction where these things are done?
|
||||
|
||||
I only have time for a "off-the-top-of-my-head" answer at the moment;
|
||||
I suggest you step through the code with a debugger after reading this
|
||||
to see how it works, fill in details, and make sure I didn't forget
|
||||
anything.
|
||||
|
||||
A new (Python) subclass of Boost.Python.Instance (see
|
||||
libs/python/src/object/class.cpp) is created by invoking
|
||||
Boost.Python.class, the metatype::
|
||||
|
||||
>>> boring = Boost.Python.class(
|
||||
... 'boring'
|
||||
... , bases_tuple # in this case, just ()
|
||||
... , {
|
||||
... '__module__' : module_name
|
||||
... , '__doc__' : doc_string # optional
|
||||
... }
|
||||
... )
|
||||
|
||||
A handle to this object is stuck in the m_class_object field
|
||||
of the registration associated with ``typeid(boring)``. The
|
||||
registry will keep that object alive forever, even if you
|
||||
wipe out the 'boring' attribute of the extension module
|
||||
(probably not a good thing).
|
||||
|
||||
Because you didn't specify ``class<boring, non_copyable,
|
||||
...>``, a to-python converter for boring is registered which
|
||||
copies its argument into a value_holder held by the the
|
||||
Python boring object.
|
||||
|
||||
Because you didn't specify ``class<boring ...>(no_init)``,
|
||||
an ``__init__`` function object is added to the class
|
||||
dictionary which default-constructs a boring in a
|
||||
value_holder (because you didn't specify some smart pointer
|
||||
or derived wrapper class as a holder) held by the Python
|
||||
boring object.
|
||||
|
||||
``register_class_from_python`` is used to register a
|
||||
from-python converter for ``shared_ptr<boring>``.
|
||||
``boost::shared_ptr``\ s are special among smart pointers
|
||||
because their Deleter argument can be made to manage the
|
||||
whole Python object, not just the C++ object it contains, no
|
||||
matter how the C++ object is held.
|
||||
|
||||
If there were any ``bases<>``, we'd also be registering the
|
||||
relationship between these base classes and boring in the
|
||||
up/down cast graph (``inheritance.[hpp/cpp]``).
|
||||
|
||||
In earlier versions of the code, we'd be registering lvalue
|
||||
from-python converters for the class here, but now
|
||||
from-python conversion for wrapped classes is handled as a
|
||||
special case, before consulting the registry, if the source
|
||||
Python object's metaclass is the Boost.Python metaclass.
|
||||
|
||||
Hmm, that from-python converter probably ought to be handled
|
||||
the way class converters are, with no explicit conversions
|
||||
registered.
|
||||
|
||||
2) Can you give a brief overview of the data structures that are
|
||||
present in the registry
|
||||
|
||||
The registry is simple: it's just a map from typeid ->
|
||||
registration (see boost/python/converter/registrations.hpp).
|
||||
``lvalue_chain`` and ``rvalue_chain`` are simple endogenous
|
||||
linked lists.
|
||||
|
||||
If you want to know more, just ask.
|
||||
|
||||
If you want to know about the cast graph, ask me something specific in
|
||||
a separate message.
|
||||
|
||||
and an overview of the process that happens as a type makes its
|
||||
way from c++ to python and back again.
|
||||
|
||||
Big subject. I suggest some background reading: look for relevant
|
||||
info in the LLNL progress reports and the messages they link to.
|
||||
Also,
|
||||
|
||||
http://mail.python.org/pipermail/c++-sig/2002-May/001023.html
|
||||
|
||||
http://mail.python.org/pipermail/c++-sig/2002-December/003115.html
|
||||
|
||||
http://aspn.activestate.com/ASPN/Mail/Message/1280898
|
||||
|
||||
http://mail.python.org/pipermail/c++-sig/2002-July/001755.html
|
||||
|
||||
from c++ to python:
|
||||
|
||||
It depends on the type and the call policies in use or, for
|
||||
``call<>(...)``, ``call_method<>(...)``, or ``object(...)``, if
|
||||
``ref`` or ``ptr`` is used. There are also two basic
|
||||
categories to to-python conversion, "return value" conversion
|
||||
(for Python->C++ calls) and "argument" conversion (for
|
||||
C++->Python calls and explicit ``object()`` conversions). The
|
||||
behavior of these two categories differs subtly in various ways
|
||||
whose details I forget at the moment. You can probably find
|
||||
the answers in the above references, and certainly in the code.
|
||||
|
||||
The "default" case is by-value (copying) conversion, which uses
|
||||
to_python_value as a to-python converter.
|
||||
|
||||
Since there can sensibly be only one way to convert any type
|
||||
to python (disregarding the idea of scoped registries for the
|
||||
moment), it makes sense that to-python conversions can be
|
||||
handled by specializing a template. If the type is one of
|
||||
the types handled by a built-in conversion
|
||||
(builtin_converters.hpp), the corresponding template
|
||||
specialization of to_python_value gets used.
|
||||
|
||||
Otherwise, to_python_value uses the ``m_to_python``
|
||||
function in the registration for the C++ type.
|
||||
|
||||
Other conversions, like by-reference conversions, are only
|
||||
available for wrapped classes, and are requested explicitly by
|
||||
using ``ref(...)``, ``ptr(...)``, or by specifying different
|
||||
CallPolicies for a call, which can cause a different to-python
|
||||
converter to be used. These conversions are never registered
|
||||
anywhere, though they do need to use the registration to find
|
||||
the Python class corresponding to the C++ type being referred
|
||||
to. They just build a new Python instance and stick the
|
||||
appropriate Holder instance in it.
|
||||
|
||||
|
||||
from python to C++:
|
||||
|
||||
Once again I think there is a distinction between "return value"
|
||||
and "argument" conversions, and I forget exactly what that is.
|
||||
|
||||
What happens depends on whether an lvalue conversion is needed
|
||||
(see http://mail.python.org/pipermail/c++-sig/2002-May/001023.html)
|
||||
All lvalue conversions are also registered in a type's rvalue
|
||||
conversion chain, since when an rvalue will do, an lvalue is
|
||||
certainly good enough.
|
||||
|
||||
An lvalue conversion can be done in one step (just get me the
|
||||
pointer to the object - it can be ``NULL`` if no conversion is
|
||||
possible) while an rvalue conversion requires two steps to
|
||||
support wrapped function overloading and multiple converters for
|
||||
a given C++ target type: first tell me if a conversion is
|
||||
possible, then construct the converted object as a second step.
|
||||
|
||||
@@ -7,7 +7,7 @@
|
||||
|
||||
<body bgcolor="#FFFFFF" text="#000000">
|
||||
|
||||
<p><img border="0" src="../../../c++boost.gif" width="277" height="86"
|
||||
<p><img border="0" src="../../../boost.png" width="277" height="86"
|
||||
alt="boost logo"></p>
|
||||
|
||||
<h1>A New Type Conversion Mechanism for Boost.Python</h1>
|
||||
@@ -318,7 +318,9 @@ until the result object is retrieved.</font>
|
||||
Special Edition Addison-Wesley, ISBN 0-201-70073-5.
|
||||
|
||||
<hr>
|
||||
<p>Revised <!--webbot bot="Timestamp" s-type="EDITED" s-format="%d %B %Y" startspan -->19 December 2001<!--webbot bot="Timestamp" endspan i-checksum="31283" --></p>
|
||||
<p>Revised <!--webbot bot="Timestamp" s-type="EDITED" s-format="%d %B %Y" startspan -->
|
||||
13 November, 2002
|
||||
<!--webbot bot="Timestamp" endspan i-checksum="31283" --></p>
|
||||
<p>© Copyright David Abrahams, 2001</p>
|
||||
|
||||
</body>
|
||||
|
||||
211
doc/news.html
Normal file
@@ -0,0 +1,211 @@
|
||||
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
|
||||
|
||||
<html>
|
||||
<head>
|
||||
<meta name="generator" content=
|
||||
"HTML Tidy for Cygwin (vers 1st April 2002), see www.w3.org">
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<link rel="stylesheet" type="text/css" href="boost.css">
|
||||
|
||||
<title>Boost.Python - News/Change Log</title>
|
||||
</head>
|
||||
|
||||
<body link="#0000ff" vlink="#800080">
|
||||
<table border="0" cellpadding="7" cellspacing="0" width="100%" summary=
|
||||
"header">
|
||||
<tr>
|
||||
<td valign="top" width="300">
|
||||
<h3><a href="../../../index.htm"><img height="86" width="277" alt=
|
||||
"C++ Boost" src="../../../boost.png" border="0"></a></h3>
|
||||
</td>
|
||||
|
||||
<td valign="top">
|
||||
<h1 align="center"><a href="index.html">Boost.Python</a></h1>
|
||||
|
||||
<h2 align="center">News/Change Log</h2>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
<hr>
|
||||
|
||||
<dl class="page-index">
|
||||
<dt>19 November 2004 - 1.32 release</dt>
|
||||
|
||||
<dd>
|
||||
<ul>
|
||||
<li>Updated to use the Boost Software License.</li>
|
||||
<li>A new, <a href="tutorial/doc/html/python/exposing.html#python.class_virtual_functions">better method of wrapping classes with virtual functions</a> has been implemented.</li>
|
||||
<li>Support for upcoming GCC symbol export control features have been folded in, thanks to Niall Douglas.</li>
|
||||
<li>Improved support for <code>std::auto_ptr</code>-like types.</li>
|
||||
<li>The Visual C++ bug that makes top-level <i>cv-qualification</i> of function parameter types part of the function type has been worked around.</li>
|
||||
<li>Components used by other libraries have been moved out of <code>python/detail</code> and into <code> boost/detail</code> to improve dependency relationships.</li>
|
||||
<li>Miscellaneous bug fixes and compiler workarounds.</li>
|
||||
</ul>
|
||||
</dd>
|
||||
<dt>8 Sept 2004</dt>
|
||||
|
||||
<dd>
|
||||
Support for Python's Bool type, thanks to <a
|
||||
mailto="dholth-at-fastmail.fm">Daniel Holth</a>.
|
||||
</dd>
|
||||
|
||||
<dt>11 Sept 2003</dt>
|
||||
|
||||
<dd>
|
||||
<ul>
|
||||
<li>Changed the response to multiple to-python converters being
|
||||
registered for the same type from a hard error into warning;
|
||||
Boost.Python now reports the offending type in the message.</li>
|
||||
|
||||
<li>Added builtin <code>std::wstring</code> conversions</li>
|
||||
|
||||
<li>Added <code>std::out_of_range</code> => Python
|
||||
<code>IndexError</code> exception conversion, thanks to <a href=
|
||||
"mailto:RaoulGough-at-yahoo.co.uk">Raoul Gough</a></li>
|
||||
</ul>
|
||||
</dd>
|
||||
|
||||
<dt>9 Sept 2003</dt>
|
||||
|
||||
<dd>Added new <code><a href="v2/str.html#str-spec">str</a></code></dd>
|
||||
|
||||
<dt>constructors which take a range of characters, allowing strings
|
||||
containing nul (<code>'\0'</code>) characters.</dt>
|
||||
|
||||
<dt>8 Sept 2003</dt>
|
||||
|
||||
<dd>Added the ability to create methods from function objects (with an
|
||||
<code>operator()</code>); see the <a href=
|
||||
"v2/make_function.html#make_function-spec">make_function</a> docs for
|
||||
more info.</dd>
|
||||
|
||||
<dt>10 August 2003</dt>
|
||||
|
||||
<dd>Added the new <code>properties</code> unit tests contributed by <a
|
||||
href="mailto:romany-at-actimize.com">Roman Yakovenko</a> and documented
|
||||
<code>add_static_property</code> at his urging.</dd>
|
||||
|
||||
<dt>1 August 2003</dt>
|
||||
|
||||
<dd>
|
||||
Added the new <code>arg</code> class contributed by <a href=
|
||||
"mailto:nickm-at-sitius.com">Nikolay Mladenov</a> which supplies the
|
||||
ability to wrap functions that can be called with ommitted arguments
|
||||
in the middle:
|
||||
<pre>
|
||||
void f(int x = 0, double y = 3.14, std::string z = std::string("foo"));
|
||||
|
||||
BOOST_PYTHON_MODULE(test)
|
||||
{
|
||||
def("f", f
|
||||
, (arg("x", 0), arg("y", 3.14), arg("z", "foo")));
|
||||
}
|
||||
|
||||
</pre>
|
||||
And in Python:
|
||||
<pre>
|
||||
>>> import test
|
||||
>>> f(0, z = "bar")
|
||||
>>> f(z = "bar", y = 0.0)
|
||||
</pre>
|
||||
Thanks, Nikolay!
|
||||
</dd>
|
||||
|
||||
<dt>22 July 2003</dt>
|
||||
|
||||
<dd>Killed the dreaded "bad argument type for builtin operation" error.
|
||||
Argument errors now show the actual and expected argument types!</dd>
|
||||
|
||||
<dt>19 July 2003</dt>
|
||||
|
||||
<dd>Added the new <code><a href=
|
||||
"v2/return_arg.html">return_arg</a></code> policy from <a href=
|
||||
"mailto:nickm-at-sitius.com">Nikolay Mladenov</a>. Thanks,
|
||||
Nikolay!</dd>
|
||||
|
||||
<dt>18 March, 2003</dt>
|
||||
|
||||
<dd><a href="mailto:Gottfried.Ganssauge-at-haufe.de">Gottfried
|
||||
Ganßauge</a> has contributed <a href=
|
||||
"v2/opaque_pointer_converter.html">opaque pointer support</a>.<br>
|
||||
<a href="mailto:nicodemus-at-globalite.com.br">Bruno da Silva de Oliveira</a>
|
||||
has contributed the exciting <a href="../pyste/index.html">Pyste</a>
|
||||
("Pie-steh") package.</dd>
|
||||
|
||||
<dt>24 February 2003</dt>
|
||||
|
||||
<dd>Finished improved support for <code>boost::shared_ptr</code>. Now
|
||||
any wrapped object of C++ class <code>X</code> can be converted
|
||||
automatically to <code>shared_ptr<X></code>, regardless of how it
|
||||
was wrapped. The <code>shared_ptr</code> will manage the lifetime of
|
||||
the Python object which supplied the <code>X</code>, rather than just
|
||||
the <code>X</code> object itself, and when such a
|
||||
<code>shared_ptr</code> is converted back to Python, the original
|
||||
Python object will be returned.</dd>
|
||||
|
||||
<dt>19 January 2003</dt>
|
||||
|
||||
<dd>Integrated <code>staticmethod</code> support from <a href=
|
||||
"mailto:nickm-at-sitius.com">Nikolay Mladenov</a>. Thanks,
|
||||
Nikolay!</dd>
|
||||
|
||||
<dt>29 December 2002</dt>
|
||||
|
||||
<dd>Added Visual Studio project file and instructions from Brett
|
||||
Calcott. Thanks, Brett!</dd>
|
||||
|
||||
<dt>20 December 2002</dt>
|
||||
|
||||
<dd>Added automatic downcasting for pointers, references, and smart
|
||||
pointers to polymorphic class types upon conversion to python</dd>
|
||||
|
||||
<dt>18 December 2002</dt>
|
||||
|
||||
<dd>Optimized from_python conversions for wrapped classes by putting
|
||||
the conversion logic in the shared library instead of registering
|
||||
separate converters for each class in each extension module</dd>
|
||||
|
||||
<dt>19 November 2002</dt>
|
||||
|
||||
<dd>Removed the need for users to cast base class member function
|
||||
pointers when used as arguments to <a href=
|
||||
"v2/class.html#class_-spec-modifiers">add_property</a></dd>
|
||||
|
||||
<dt>13 December 2002</dt>
|
||||
|
||||
<dd>Allow exporting of <a href=
|
||||
"v2/enum.html#enum_-spec"><code>enum_</code></a> values into enclosing
|
||||
<a href="v2/scope.html#scope-spec"><code>scope</code></a>.<br>
|
||||
Fixed unsigned integer conversions to deal correctly with numbers that
|
||||
are out-of-range of <code>signed long</code>.</dd>
|
||||
|
||||
<dt>14 November 2002</dt>
|
||||
|
||||
<dd>Auto-detection of class data members wrapped with <a href=
|
||||
"v2/data_members.html#make_getter-spec"><code>make_getter</code></a></dd>
|
||||
|
||||
<dt>13 November 2002</dt>
|
||||
|
||||
<dd>Full Support for <code>std::auto_ptr<></code> added.</dd>
|
||||
|
||||
<dt>October 2002</dt>
|
||||
|
||||
<dd>Ongoing updates and improvements to tutorial documentation</dd>
|
||||
|
||||
<dt>10 October 2002</dt>
|
||||
|
||||
<dd>Boost.Python V2 is released!</dd>
|
||||
</dl>
|
||||
<hr>
|
||||
|
||||
<p>Revised
|
||||
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
|
||||
19 November 2004
|
||||
<!--webbot bot="Timestamp" endspan i-checksum="39359" -->
|
||||
</p>
|
||||
|
||||
<p><i>© Copyright <a href="../../../people/dave_abrahams.htm">Dave
|
||||
Abrahams</a> 2002-2003.</i></p>
|
||||
</body>
|
||||
</html>
|
||||
|
||||
@@ -1,155 +0,0 @@
|
||||
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0//EN"
|
||||
"http://www.w3.org/TR/REC-html40/strict.dtd">
|
||||
<title>
|
||||
Function Overloading
|
||||
</title>
|
||||
<div>
|
||||
<h1>
|
||||
<img width="277" height="86" id="_x0000_i1025" align="center"
|
||||
src="../../../c++boost.gif" alt= "c++boost.gif (8819 bytes)">Function Overloading
|
||||
</h1>
|
||||
|
||||
<h2>An Example</h2>
|
||||
<p>
|
||||
To expose overloaded functions in Python, simply <code>def()</code> each
|
||||
one with the same Python name:
|
||||
<blockquote>
|
||||
<pre>
|
||||
inline int f1() { return 3; }
|
||||
inline int f2(int x) { return x + 1; }
|
||||
|
||||
class X {
|
||||
public:
|
||||
X() : m_value(0) {}
|
||||
X(int n) : m_value(n) {}
|
||||
int value() const { return m_value; }
|
||||
void value(int v) { m_value = v; }
|
||||
private:
|
||||
int m_value;
|
||||
};
|
||||
...
|
||||
|
||||
BOOST_PYTHON_MODULE_INIT(overload_demo)
|
||||
{
|
||||
try
|
||||
{
|
||||
boost::python::module_builder overload_demo("overload_demo");
|
||||
// Overloaded functions at module scope
|
||||
overload_demo.def(f1, "f");
|
||||
overload_demo.def(f2, "f");
|
||||
|
||||
boost::python::class_builder<X> x_class(overload_demo, "X");
|
||||
// Overloaded constructors
|
||||
x_class.def(boost::python::constructor<>());
|
||||
x_class.def(boost::python::constructor<int>());
|
||||
|
||||
// Overloaded member functions
|
||||
x_class.def((int (X::*)() const)&X::value, "value");
|
||||
x_class.def((void (X::*)(int))&X::value, "value");
|
||||
...
|
||||
</pre>
|
||||
</blockquote>
|
||||
|
||||
<p>
|
||||
Now in Python:
|
||||
<blockquote>
|
||||
<pre>
|
||||
>>> from overload_demo import *
|
||||
>>> x0 = X()
|
||||
>>> x1 = X(1)
|
||||
>>> x0.value()
|
||||
0
|
||||
>>> x1.value()
|
||||
1
|
||||
>>> x0.value(3)
|
||||
>>> x0.value()
|
||||
3
|
||||
>>> X('hello')
|
||||
TypeError: No overloaded functions match (X, string). Candidates are:
|
||||
void (*)()
|
||||
void (*)(int)
|
||||
>>> f()
|
||||
3
|
||||
>>> f(4)
|
||||
5
|
||||
</pre>
|
||||
</blockquote>
|
||||
|
||||
<h2>Discussion</h2>
|
||||
<p>
|
||||
Notice that overloading in the Python module was produced three ways:<ol>
|
||||
<li>by combining the non-overloaded C++ functions <code>int f1()</code>
|
||||
and <code>int f2(int)</code> and exposing them as <code>f</code> in Python.
|
||||
<li>by exposing the overloaded constructors of <code>class X</code>
|
||||
<li>by exposing the overloaded member functions <code>X::value</code>.
|
||||
</ol>
|
||||
<p>
|
||||
Techniques 1. and 3. above are really alternatives. In case 3, you need
|
||||
to form a pointer to each of the overloaded functions. The casting
|
||||
syntax shown above is one way to do that in C++. Case 1 does not require
|
||||
complicated-looking casts, but may not be viable if you can't change
|
||||
your C++ interface. N.B. There's really nothing unsafe about casting an
|
||||
overloaded (member) function address this way: the compiler won't let
|
||||
you write it at all unless you get it right.
|
||||
|
||||
<h2>An Alternative to Casting</h2>
|
||||
<p>
|
||||
This approach is not neccessarily better, but may be preferable for some
|
||||
people who have trouble writing out the types of (member) function
|
||||
pointers or simply prefer to avoid all casts as a matter of principle:
|
||||
<blockquote>
|
||||
<pre>
|
||||
// Forwarding functions for X::value
|
||||
inline void set_x_value(X& self, int v) { self.value(v); }
|
||||
inline int get_x_value(X& self) { return self.value(); }
|
||||
...
|
||||
// Overloaded member functions
|
||||
x_class.def(set_x_value, "value");
|
||||
x_class.def(get_x_value, "value");
|
||||
</pre>
|
||||
</blockquote>
|
||||
<p>Here we are taking advantage of the ability to expose C++ functions at
|
||||
namespace scope as Python member functions.
|
||||
|
||||
<h2>Overload Resolution</h2>
|
||||
<p>
|
||||
The function overload resolution mechanism works as follows:
|
||||
|
||||
<ul>
|
||||
|
||||
<li>Attribute lookup for extension classes proceeds in <a
|
||||
href="http://www.python.org/doc/current/tut/node11.html#SECTION0011510000000000000000">the
|
||||
usual Python way</a> using a depth-first, left-to-right search. When a
|
||||
class is found which has a matching attribute, only functions overloaded
|
||||
in the context of that class are candidates for overload resolution. In
|
||||
this sense, overload resolution mirrors the C++ mechanism, where a name
|
||||
in a derived class ``hides'' all functions with the same name from a base
|
||||
class.
|
||||
<p>
|
||||
|
||||
<li>Within a name-space context (extension class or module), overloaded
|
||||
functions are tried in the same order they were
|
||||
<code>def()</code>ed. The first function whose signature can be made to
|
||||
match each argument passed is the one which is ultimately called.
|
||||
This means in particular that you cannot overload the same function on
|
||||
both ``<code>int</code>'' and ``<code>float</code>'' because Python
|
||||
automatically converts either of the two types into the other one.
|
||||
If the ``<code>float</code>'' overload is found first, it is used
|
||||
also used for arguments of type ``<code>int</code>'' as well, and the
|
||||
``<code>int</code>'' version of the function is never invoked.
|
||||
</ul>
|
||||
|
||||
<p>
|
||||
Next: <a href="inheritance.html">Inheritance</a>
|
||||
Previous: <a href="overriding.html">Overridable Virtual Functions</a>
|
||||
Up: <a href="index.html">Top</a>
|
||||
<p>
|
||||
© Copyright David Abrahams 2001. Permission to copy, use, modify,
|
||||
sell and distribute this document is granted provided this copyright
|
||||
notice appears in all copies. This document is provided ``as
|
||||
is'' without express or implied warranty, and with no claim as to
|
||||
its suitability for any purpose.
|
||||
<p>
|
||||
Updated: Mar 6, 2001
|
||||
</div>
|
||||
|
||||
@@ -1,208 +0,0 @@
|
||||
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.2//EN">
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
|
||||
|
||||
<title>Overridable Virtual Functions</title>
|
||||
|
||||
<img src="../../../c++boost.gif" alt="c++boost.gif (8819 bytes)" align="center"
|
||||
width="277" height="86">
|
||||
|
||||
<h1>Overridable Virtual Functions</h1>
|
||||
|
||||
<p>
|
||||
In the <a href="exporting_classes.html">previous example</a> we exposed a simple
|
||||
C++ class in Python and showed that we could write a subclass. We even
|
||||
redefined one of the functions in our derived class. Now we will learn
|
||||
how to make the function behave virtually <em>when called from C++</em>.
|
||||
|
||||
|
||||
<h2><a name="overriding_example">Example</a></h2>
|
||||
|
||||
<p>In this example, it is assumed that <code>hello::greet()</code> is a virtual
|
||||
member function:
|
||||
|
||||
<blockquote><pre>
|
||||
class hello
|
||||
{
|
||||
public:
|
||||
hello(const std::string& country) { this->country = country; }
|
||||
<b>virtual</b> std::string greet() const { return "Hello from " + country; }
|
||||
virtual ~hello(); // Good practice
|
||||
...
|
||||
};
|
||||
</pre></blockquote>
|
||||
|
||||
<p>
|
||||
We'll need a derived class<a href="#why_derived">*</a> to help us
|
||||
dispatch the call to Python. In our derived class, we need the following
|
||||
elements:
|
||||
|
||||
<ol>
|
||||
|
||||
<li><a name="derived_1">A</a> <code>PyObject*</code> data member (usually
|
||||
called <tt>self</tt>) that holds a pointer to the Python object corresponding
|
||||
to our C++ <tt>hello</tt> instance.
|
||||
|
||||
<li><a name="derived_2">For</a> each exposed constructor of the
|
||||
base class <tt>T</tt>, a constructor which takes the same parameters preceded by an initial
|
||||
<code>PyObject*</code> argument. The initial argument should be stored in the <tt>self</tt> data
|
||||
member described above.
|
||||
|
||||
<li><a name="derived_3">If</a> the class being wrapped is ever returned <i>by
|
||||
value</i> from a wrapped function, be sure you do the same for the
|
||||
<tt>T</tt>'s copy constructor: you'll need a constructor taking arguments
|
||||
<tt>(PyObject*, const T&)</tt>.
|
||||
|
||||
<li><a name="derived_4">An</a> implementation of each virtual function you may
|
||||
wish to override in Python which uses
|
||||
<tt>callback<</tt><i>return-type</i><tt>>::call_method(self, "</tt><i>name</i><tt>", </tt><i>args...</i><tt>)</tt> to call
|
||||
the Python override.
|
||||
|
||||
<li><a name="derived_5">For</a> each non-pure virtual function meant to be
|
||||
overridable from Python, a static member function (or a free function) taking
|
||||
a reference or pointer to the <tt>T</tt> as the first parameter and which
|
||||
forwards any additional parameters neccessary to the <i>default</i>
|
||||
implementation of the virtual function. See also <a href="#private">this
|
||||
note</a> if the base class virtual function is private.
|
||||
|
||||
</ol>
|
||||
|
||||
<blockquote><pre>
|
||||
struct hello_callback : hello
|
||||
{
|
||||
// hello constructor storing initial self_ parameter
|
||||
hello_callback(PyObject* self_, const std::string& x) // <a href="#derived_2">2</a>
|
||||
: hello(x), self(self_) {}
|
||||
|
||||
// In case hello is returned by-value from a wrapped function
|
||||
hello_callback(PyObject* self_, const hello& x) // <a href="#derived_3">3</a>
|
||||
: hello(x), self(self_) {}
|
||||
|
||||
// Override greet to call back into Python
|
||||
std::string greet() const // <a href="#derived_4">4</a>
|
||||
{ return boost::python::callback<std::string>::call_method(self, "greet"); }
|
||||
|
||||
// Supplies the default implementation of greet
|
||||
static std::string <a name= "default_implementation">default_greet</a>(const hello& self_) const // <a href="#derived_5">5</a>
|
||||
{ return self_.hello::greet(); }
|
||||
private:
|
||||
PyObject* self; // <a href="#derived_1">1</a>
|
||||
};
|
||||
</pre></blockquote>
|
||||
|
||||
<p>
|
||||
Finally, we add <tt>hello_callback</tt> to the <tt>
|
||||
class_builder<></tt> declaration in our module initialization
|
||||
function, and when we define the function, we must tell Boost.Python about the default
|
||||
implementation:
|
||||
|
||||
<blockquote><pre>
|
||||
// Create the <a name=
|
||||
"hello_class">Python type object</a> for our extension class
|
||||
boost::python::class_builder<hello<strong>,hello_callback></strong> hello_class(hello, "hello");
|
||||
// Add a virtual member function
|
||||
hello_class.def(&hello::greet, "greet", &<b>hello_callback::default_greet</b>);
|
||||
</pre></blockquote>
|
||||
|
||||
<p>
|
||||
Now our Python subclass of <tt>hello</tt> behaves as expected:
|
||||
|
||||
<blockquote><pre>
|
||||
>>> class wordy(hello):
|
||||
... def greet(self):
|
||||
... return hello.greet(self) + ', where the weather is fine'
|
||||
...
|
||||
>>> hi2 = wordy('Florida')
|
||||
>>> hi2.greet()
|
||||
'Hello from Florida, where the weather is fine'
|
||||
>>> invite(hi2)
|
||||
'Hello from Florida, where the weather is fine! Please come soon!'
|
||||
</pre></blockquote>
|
||||
<p>
|
||||
<a name="why_derived">*</a>You may ask, "Why do we need this derived
|
||||
class? This could have been designed so that everything gets done right
|
||||
inside of <tt>hello</tt>." One of the goals of Boost.Python is to be
|
||||
minimally intrusive on an existing C++ design. In principle, it should be
|
||||
possible to expose the interface for a 3rd party library without changing
|
||||
it. To unintrusively hook into the virtual functions so that a Python
|
||||
override may be called, we must use a derived class.
|
||||
|
||||
<h2>Pure Virtual Functions</h2>
|
||||
|
||||
<p>
|
||||
A pure virtual function with no implementation is actually a lot easier to
|
||||
deal with than a virtual function with a default implementation. First of
|
||||
all, you obviously don't need to <a href="#default_implementation"> supply
|
||||
a default implementation</a>. Secondly, you don't need to call
|
||||
<tt>def()</tt> on the <tt>extension_class<></tt> instance
|
||||
for the virtual function. In fact, you wouldn't <em>want</em> to: if the
|
||||
corresponding attribute on the Python class stays undefined, you'll get an
|
||||
<tt>AttributeError</tt> in Python when you try to call the function,
|
||||
indicating that it should have been implemented. For example:
|
||||
<blockquote>
|
||||
<pre>
|
||||
struct baz {
|
||||
<strong>virtual</strong> int pure(int) = 0;
|
||||
int calls_pure(int x) { return pure(x) + 1000; }
|
||||
};
|
||||
|
||||
struct baz_callback {
|
||||
int pure(int x) { boost::python::callback<int>::call_method(m_self, "pure", x); }
|
||||
};
|
||||
|
||||
BOOST_PYTHON_MODULE_INIT(foobar)
|
||||
{
|
||||
boost::python::module_builder foobar("foobar");
|
||||
boost::python::class_builder<baz,baz_callback> baz_class("baz");
|
||||
baz_class.def(&baz::calls_pure, "calls_pure");
|
||||
}
|
||||
</pre>
|
||||
</blockquote>
|
||||
<p>
|
||||
Now in Python:
|
||||
<blockquote>
|
||||
<pre>
|
||||
>>> from foobar import baz
|
||||
>>> x = baz()
|
||||
>>> x.pure(1)
|
||||
Traceback (innermost last):
|
||||
File "<stdin>", line 1, in ?
|
||||
AttributeError: pure
|
||||
>>> x.calls_pure(1)
|
||||
Traceback (innermost last):
|
||||
File "<stdin>", line 1, in ?
|
||||
AttributeError: pure
|
||||
>>> class mumble(baz):
|
||||
... def pure(self, x): return x + 1
|
||||
...
|
||||
>>> y = mumble()
|
||||
>>> y.pure(99)
|
||||
100
|
||||
>>> y.calls_pure(99)
|
||||
1100
|
||||
</pre></blockquote>
|
||||
|
||||
<a name="private"><h2>Private Non-Pure Virtual Functions</h2></a>
|
||||
|
||||
<p>This is one area where some minor intrusiveness on the wrapped library is
|
||||
required. Once it has been overridden, the only way to call the base class
|
||||
implementation of a private virtual function is to make the derived class a
|
||||
friend of the base class. You didn't hear it from me, but most C++
|
||||
implementations will allow you to change the declaration of the base class in
|
||||
this limited way without breaking binary compatibility (though it will certainly
|
||||
break the <a
|
||||
href="http://cs.calvin.edu/c++/C++Standard-Nov97/basic.html#basic.def.odr">ODR</a>).
|
||||
|
||||
<hr>
|
||||
<p>
|
||||
Next: <a href="overloading.html">Function Overloading</a>
|
||||
Previous: <a href="exporting_classes.html">Exporting Classes</a>
|
||||
Up: <a href="index.html">Top</a>
|
||||
<p>
|
||||
© Copyright David Abrahams 2001. Permission to copy, use, modify,
|
||||
sell and distribute this document is granted provided this copyright
|
||||
notice appears in all copies. This document is provided "as is" without
|
||||
express or implied warranty, and with no claim as to its suitability for
|
||||
any purpose.
|
||||
<p>
|
||||
Updated: Mar 21, 2001
|
||||
|
||||
272
doc/pickle.html
@@ -1,272 +0,0 @@
|
||||
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0//EN"
|
||||
"http://www.w3.org/TR/REC-html40/strict.dtd">
|
||||
|
||||
<title>Boost.Python Pickle Support</title>
|
||||
|
||||
<div>
|
||||
|
||||
<img src="../../../c++boost.gif"
|
||||
alt="c++boost.gif (8819 bytes)"
|
||||
align="center"
|
||||
width="277" height="86">
|
||||
|
||||
<hr>
|
||||
<h1>Boost.Python Pickle Support</h1>
|
||||
|
||||
Pickle is a Python module for object serialization, also known
|
||||
as persistence, marshalling, or flattening.
|
||||
|
||||
<p>
|
||||
It is often necessary to save and restore the contents of an object to
|
||||
a file. One approach to this problem is to write a pair of functions
|
||||
that read and write data from a file in a special format. A powerful
|
||||
alternative approach is to use Python's pickle module. Exploiting
|
||||
Python's ability for introspection, the pickle module recursively
|
||||
converts nearly arbitrary Python objects into a stream of bytes that
|
||||
can be written to a file.
|
||||
|
||||
<p>
|
||||
The Boost Python Library supports the pickle module by emulating the
|
||||
interface implemented by Jim Fulton's ExtensionClass module that is
|
||||
included in the
|
||||
<a href="http://www.zope.org/"
|
||||
>ZOPE</a>
|
||||
distribution.
|
||||
This interface is similar to that for regular Python classes as
|
||||
described in detail in the
|
||||
<a href="http://www.python.org/doc/current/lib/module-pickle.html"
|
||||
>Python Library Reference for pickle.</a>
|
||||
|
||||
<hr>
|
||||
<h2>The Boost.Python Pickle Interface</h2>
|
||||
|
||||
At the user level, the Boost.Python pickle interface involves three special
|
||||
methods:
|
||||
|
||||
<dl>
|
||||
<dt>
|
||||
<strong><tt>__getinitargs__</tt></strong>
|
||||
<dd>
|
||||
When an instance of a Boost.Python extension class is pickled, the
|
||||
pickler tests if the instance has a <tt>__getinitargs__</tt> method.
|
||||
This method must return a Python tuple (it is most convenient to use
|
||||
a boost::python::tuple). When the instance is restored by the
|
||||
unpickler, the contents of this tuple are used as the arguments for
|
||||
the class constructor.
|
||||
|
||||
<p>
|
||||
If <tt>__getinitargs__</tt> is not defined, the class constructor
|
||||
will be called without arguments.
|
||||
|
||||
<p>
|
||||
<dt>
|
||||
<strong><tt>__getstate__</tt></strong>
|
||||
|
||||
<dd>
|
||||
When an instance of a Boost.Python extension class is pickled, the
|
||||
pickler tests if the instance has a <tt>__getstate__</tt> method.
|
||||
This method should return a Python object representing the state of
|
||||
the instance.
|
||||
|
||||
<p>
|
||||
If <tt>__getstate__</tt> is not defined, the instance's
|
||||
<tt>__dict__</tt> is pickled (if it is not empty).
|
||||
|
||||
<p>
|
||||
<dt>
|
||||
<strong><tt>__setstate__</tt></strong>
|
||||
|
||||
<dd>
|
||||
When an instance of a Boost.Python extension class is restored by the
|
||||
unpickler, it is first constructed using the result of
|
||||
<tt>__getinitargs__</tt> as arguments (see above). Subsequently the
|
||||
unpickler tests if the new instance has a <tt>__setstate__</tt>
|
||||
method. If so, this method is called with the result of
|
||||
<tt>__getstate__</tt> (a Python object) as the argument.
|
||||
|
||||
<p>
|
||||
If <tt>__setstate__</tt> is not defined, the result of
|
||||
<tt>__getstate__</tt> must be a Python dictionary. The items of this
|
||||
dictionary are added to the instance's <tt>__dict__</tt>.
|
||||
|
||||
</dl>
|
||||
|
||||
If both <tt>__getstate__</tt> and <tt>__setstate__</tt> are defined,
|
||||
the Python object returned by <tt>__getstate__</tt> need not be a
|
||||
dictionary. The <tt>__getstate__</tt> and <tt>__setstate__</tt> methods
|
||||
can do what they want.
|
||||
|
||||
<hr>
|
||||
<h2>Pitfalls and Safety Guards</h2>
|
||||
|
||||
In Boost.Python extension modules with many extension classes,
|
||||
providing complete pickle support for all classes would be a
|
||||
significant overhead. In general complete pickle support should only be
|
||||
implemented for extension classes that will eventually be pickled.
|
||||
However, the author of a Boost.Python extension module might not
|
||||
anticipate correctly which classes need support for pickle.
|
||||
Unfortunately, the pickle protocol described above has two important
|
||||
pitfalls that the end user of a Boost.Python extension module might not
|
||||
be aware of:
|
||||
|
||||
<dl>
|
||||
<dt>
|
||||
<strong>Pitfall 1:</strong>
|
||||
Both <tt>__getinitargs__</tt> and <tt>__getstate__</tt> are not defined.
|
||||
|
||||
<dd>
|
||||
In this situation the unpickler calls the class constructor without
|
||||
arguments and then adds the <tt>__dict__</tt> that was pickled by
|
||||
default to that of the new instance.
|
||||
|
||||
<p>
|
||||
However, most C++ classes wrapped with Boost.Python will have member
|
||||
data that are not restored correctly by this procedure. To alert the
|
||||
user to this problem, a safety guard is provided. If both
|
||||
<tt>__getinitargs__</tt> and <tt>__getstate__</tt> are not defined,
|
||||
Boost.Python tests if the class has an attribute
|
||||
<tt>__dict_defines_state__</tt>. An exception is raised if this
|
||||
attribute is not defined:
|
||||
|
||||
<pre>
|
||||
RuntimeError: Incomplete pickle support (__dict_defines_state__ not set)
|
||||
</pre>
|
||||
|
||||
In the rare cases where this is not the desired behavior, the safety
|
||||
guard can deliberately be disabled. The corresponding C++ code for
|
||||
this is, e.g.:
|
||||
|
||||
<pre>
|
||||
class_builder<your_class> py_your_class(your_module, "your_class");
|
||||
py_your_class.dict_defines_state();
|
||||
</pre>
|
||||
|
||||
It is also possible to override the safety guard at the Python level.
|
||||
E.g.:
|
||||
|
||||
<pre>
|
||||
import your_bpl_module
|
||||
class your_class(your_bpl_module.your_class):
|
||||
__dict_defines_state__ = 1
|
||||
</pre>
|
||||
|
||||
<p>
|
||||
<dt>
|
||||
<strong>Pitfall 2:</strong>
|
||||
<tt>__getstate__</tt> is defined and the instance's <tt>__dict__</tt> is not empty.
|
||||
|
||||
<dd>
|
||||
The author of a Boost.Python extension class might provide a
|
||||
<tt>__getstate__</tt> method without considering the possibilities
|
||||
that:
|
||||
|
||||
<p>
|
||||
<ul>
|
||||
<li>
|
||||
his class is used in Python as a base class. Most likely the
|
||||
<tt>__dict__</tt> of instances of the derived class needs to be
|
||||
pickled in order to restore the instances correctly.
|
||||
|
||||
<p>
|
||||
<li>
|
||||
the user adds items to the instance's <tt>__dict__</tt> directly.
|
||||
Again, the <tt>__dict__</tt> of the instance then needs to be
|
||||
pickled.
|
||||
|
||||
</ul>
|
||||
<p>
|
||||
|
||||
To alert the user to this highly unobvious problem, a safety guard is
|
||||
provided. If <tt>__getstate__</tt> is defined and the instance's
|
||||
<tt>__dict__</tt> is not empty, Boost.Python tests if the class has
|
||||
an attribute <tt>__getstate_manages_dict__</tt>. An exception is
|
||||
raised if this attribute is not defined:
|
||||
|
||||
<pre>
|
||||
RuntimeError: Incomplete pickle support (__getstate_manages_dict__ not set)
|
||||
</pre>
|
||||
|
||||
To resolve this problem, it should first be established that the
|
||||
<tt>__getstate__</tt> and <tt>__setstate__</tt> methods manage the
|
||||
instances's <tt>__dict__</tt> correctly. Note that this can be done
|
||||
both at the C++ and the Python level. Finally, the safety guard
|
||||
should intentionally be overridden. E.g. in C++:
|
||||
|
||||
<pre>
|
||||
class_builder<your_class> py_your_class(your_module, "your_class");
|
||||
py_your_class.getstate_manages_dict();
|
||||
</pre>
|
||||
|
||||
In Python:
|
||||
|
||||
<pre>
|
||||
import your_bpl_module
|
||||
class your_class(your_bpl_module.your_class):
|
||||
__getstate_manages_dict__ = 1
|
||||
def __getstate__(self):
|
||||
# your code here
|
||||
def __setstate__(self, state):
|
||||
# your code here
|
||||
</pre>
|
||||
</dl>
|
||||
|
||||
<hr>
|
||||
<h2>Practical Advice</h2>
|
||||
|
||||
<ul>
|
||||
<li>
|
||||
Avoid using <tt>__getstate__</tt> if the instance can also be
|
||||
reconstructed by way of <tt>__getinitargs__</tt>. This automatically
|
||||
avoids Pitfall 2.
|
||||
|
||||
<p>
|
||||
<li>
|
||||
If <tt>__getstate__</tt> is required, include the instance's
|
||||
<tt>__dict__</tt> in the Python object that is returned.
|
||||
|
||||
</ul>
|
||||
|
||||
<hr>
|
||||
<h2>Examples</h2>
|
||||
|
||||
There are three files in <tt>boost/libs/python/example</tt> that
|
||||
show how so provide pickle support.
|
||||
|
||||
<h3><a href="../example/pickle1.cpp"><tt>pickle1.cpp</tt></a></h3>
|
||||
|
||||
The C++ class in this example can be fully restored by passing the
|
||||
appropriate argument to the constructor. Therefore it is sufficient
|
||||
to define the pickle interface method <tt>__getinitargs__</tt>.
|
||||
|
||||
<h3><a href="../example/pickle2.cpp"><tt>pickle2.cpp</tt></a></h3>
|
||||
|
||||
The C++ class in this example contains member data that cannot be
|
||||
restored by any of the constructors. Therefore it is necessary to
|
||||
provide the <tt>__getstate__</tt>/<tt>__setstate__</tt> pair of
|
||||
pickle interface methods.
|
||||
|
||||
<p>
|
||||
For simplicity, the <tt>__dict__</tt> is not included in the result
|
||||
of <tt>__getstate__</tt>. This is not generally recommended, but a
|
||||
valid approach if it is anticipated that the object's
|
||||
<tt>__dict__</tt> will always be empty. Note that the safety guards
|
||||
will catch the cases where this assumption is violated.
|
||||
|
||||
<h3><a href="../example/pickle3.cpp"><tt>pickle3.cpp</tt></a></h3>
|
||||
|
||||
This example is similar to <a
|
||||
href="../example/pickle2.cpp"><tt>pickle2.cpp</tt></a>. However, the
|
||||
object's <tt>__dict__</tt> is included in the result of
|
||||
<tt>__getstate__</tt>. This requires more code but is unavoidable
|
||||
if the object's <tt>__dict__</tt> is not always empty.
|
||||
|
||||
<hr>
|
||||
© Copyright Ralf W. Grosse-Kunstleve 2001. Permission to copy,
|
||||
use, modify, sell and distribute this document is granted provided this
|
||||
copyright notice appears in all copies. This document is provided "as
|
||||
is" without express or implied warranty, and with no claim as to its
|
||||
suitability for any purpose.
|
||||
|
||||
<p>
|
||||
Updated: March 21, 2001
|
||||
</div>
|
||||
@@ -1,148 +0,0 @@
|
||||
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0//EN"
|
||||
"http://www.w3.org/TR/REC-html40/strict.dtd">
|
||||
<title>
|
||||
Pointers
|
||||
</title>
|
||||
<div>
|
||||
<h1>
|
||||
<img width="277" height="86" id="_x0000_i1025" align="center"
|
||||
src="../../../c++boost.gif" alt= "c++boost.gif (8819 bytes)">Pointers
|
||||
</h1>
|
||||
|
||||
<h2><a name="problem">The Problem With Pointers</a></h2>
|
||||
|
||||
<p>
|
||||
In general, raw pointers passed to or returned from functions are problematic
|
||||
for Boost.Python because pointers have too many potential meanings. Is it an iterator?
|
||||
A pointer to a single element? An array? When used as a return value, is the
|
||||
caller expected to manage (delete) the pointed-to object or is the pointer
|
||||
really just a reference? If the latter, what happens to Python references to the
|
||||
referent when some C++ code deletes it?
|
||||
<p>
|
||||
There are a few cases in which pointers are converted automatically:
|
||||
<ul>
|
||||
|
||||
<li>Both const- and non-const pointers to wrapped class instances can be passed
|
||||
<i>to</i> C++ functions.
|
||||
|
||||
<li>Values of type <code>const char*</code> are interpreted as
|
||||
null-terminated 'C' strings and when passed to or returned from C++ functions are
|
||||
converted from/to Python strings.
|
||||
|
||||
</ul>
|
||||
|
||||
<h3>Can you avoid the problem?</h3>
|
||||
|
||||
<p>My first piece of advice to anyone with a case not covered above is
|
||||
``find a way to avoid the problem.'' For example, if you have just one
|
||||
or two functions that return a pointer to an individual <code>const
|
||||
T</code>, and <code>T</code> is a wrapped class, you may be able to write a ``thin
|
||||
converting wrapper'' over those two functions as follows:
|
||||
|
||||
<blockquote><pre>
|
||||
const Foo* f(); // original function
|
||||
const Foo& f_wrapper() { return *f(); }
|
||||
...
|
||||
my_module.def(f_wrapper, "f");
|
||||
</pre></blockquote>
|
||||
<p>
|
||||
Foo must have a public copy constructor for this technique to work, since Boost.Python
|
||||
converts <code>const T&</code> values <code>to_python</code> by copying the <code>T</code>
|
||||
value into a new extension instance.
|
||||
|
||||
<h2>Dealing with the problem</h2>
|
||||
|
||||
<p>The first step in handling the remaining cases is to figure out what the pointer
|
||||
means. Several potential solutions are provided in the examples that follow:
|
||||
|
||||
<h3>Returning a pointer to a wrapped type</h3>
|
||||
|
||||
<h4>Returning a const pointer</h4>
|
||||
|
||||
<p>If you have lots of functions returning a <code>const T*</code> for some
|
||||
wrapped <code>T</code>, you may want to provide an automatic
|
||||
<code>to_python</code> conversion function so you don't have to write lots of
|
||||
thin wrappers. You can do this simply as follows:
|
||||
|
||||
<blockquote><pre>
|
||||
BOOST_PYTHON_BEGIN_CONVERSION_NAMESPACE // this is a gcc 2.95.2 bug workaround
|
||||
PyObject* to_python(const Foo* p) {
|
||||
return to_python(*p); // convert const Foo* in terms of const Foo&
|
||||
}
|
||||
BOOST_PYTHON_END_CONVERSION_NAMESPACE
|
||||
</pre></blockquote>
|
||||
|
||||
<h4>If you can't (afford to) copy the referent, or the pointer is non-const</h4>
|
||||
|
||||
<p>If the wrapped type doesn't have a public copy constructor, if copying is
|
||||
<i>extremely</i> costly (remember, we're dealing with Python here), or if the
|
||||
pointer is non-const and you really need to be able to modify the referent from
|
||||
Python, you can use the following dangerous trick. Why dangerous? Because python
|
||||
can not control the lifetime of the referent, so it may be destroyed by your C++
|
||||
code before the last Python reference to it disappears:
|
||||
|
||||
<blockquote><pre>
|
||||
BOOST_PYTHON_BEGIN_CONVERSION_NAMESPACE // this is a gcc 2.95.2 bug workaround
|
||||
PyObject* to_python(Foo* p)
|
||||
{
|
||||
return boost::python::python_extension_class_converters<Foo>::smart_ptr_to_python(p);
|
||||
}
|
||||
|
||||
PyObject* to_python(const Foo* p)
|
||||
{
|
||||
return to_python(const_cast<Foo*>(p));
|
||||
}
|
||||
BOOST_PYTHON_END_CONVERSION_NAMESPACE
|
||||
</pre></blockquote>
|
||||
|
||||
This will cause the Foo* to be treated as though it were an owning smart
|
||||
pointer, even though it's not. Be sure you don't use the reference for anything
|
||||
from Python once the pointer becomes invalid, though. Don't worry too much about
|
||||
the <code>const_cast<></code> above: Const-correctness is completely lost
|
||||
to Python anyway!
|
||||
|
||||
<h3>[In/]Out Parameters and Immutable Types</h3>
|
||||
|
||||
<p>If you have an interface that uses non-const pointers (or references) as
|
||||
in/out parameters to types which in Python are immutable (e.g. int, string),
|
||||
there simply is <i>no way</i> to get the same interface in Python. You must
|
||||
resort to transforming your interface with simple thin wrappers as shown below:
|
||||
<blockquote><pre>
|
||||
const void f(int* in_out_x); // original function
|
||||
const int f_wrapper(int in_x) { f(in_x); return in_x; }
|
||||
...
|
||||
my_module.def(f_wrapper, "f");
|
||||
</pre></blockquote>
|
||||
|
||||
<p>Of course, [in/]out parameters commonly occur only when there is already a
|
||||
return value. You can handle this case by returning a Python tuple:
|
||||
<blockquote><pre>
|
||||
typedef unsigned ErrorCode;
|
||||
const char* f(int* in_out_x); // original function
|
||||
...
|
||||
#include <boost/python/objects.hpp>
|
||||
const boost::python::tuple f_wrapper(int in_x) {
|
||||
const char* s = f(in_x);
|
||||
return boost::python::tuple(s, in_x);
|
||||
}
|
||||
...
|
||||
my_module.def(f_wrapper, "f");
|
||||
</pre></blockquote>
|
||||
<p>Now, in Python:
|
||||
<blockquote><pre>
|
||||
>>> str,out_x = f(3)
|
||||
</pre></blockquote>
|
||||
|
||||
<p>
|
||||
Previous: <a href="enums.html">Enums</a>
|
||||
Up: <a href="index.html">Top</a>
|
||||
<p>
|
||||
© Copyright David Abrahams 2000. Permission to copy, use, modify,
|
||||
sell and distribute this document is granted provided this copyright
|
||||
notice appears in all copies. This document is provided "as is" without
|
||||
express or implied warranty, and with no claim as to its suitability
|
||||
for any purpose.
|
||||
<p>
|
||||
Updated: Nov 26, 2000
|
||||
</div>
|
||||
|
||||
217
doc/polymorphism.txt
Normal file
@@ -0,0 +1,217 @@
|
||||
How Runtime Polymorphism is expressed in Boost.Python:
|
||||
-----------------------------------------------------
|
||||
|
||||
struct A { virtual std::string f(); virtual ~A(); };
|
||||
|
||||
std::string call_f(A& x) { return x.f(); }
|
||||
|
||||
struct B { virtual std::string f() { return "B"; } };
|
||||
|
||||
struct Bcb : B
|
||||
{
|
||||
Bcb(PyObject* self) : m_self(self) {}
|
||||
|
||||
virtual std::string f() { return call_method<std::string>(m_sef, "f"); }
|
||||
static std::string f_default(B& b) { return b.B::f(); }
|
||||
|
||||
PyObject* m_self;
|
||||
};
|
||||
|
||||
struct C : B
|
||||
{
|
||||
virtual std::string f() { return "C"; }
|
||||
};
|
||||
|
||||
>>> class D(B):
|
||||
... def f():
|
||||
... return 'D'
|
||||
...
|
||||
>>> class E(B): pass
|
||||
...
|
||||
|
||||
|
||||
When we write, "invokes B::f non-virtually", we mean:
|
||||
|
||||
void g(B& x) { x.B::f(); }
|
||||
|
||||
This will call B::f() regardless of the dynamic type of x. Any other
|
||||
way of invoking B::f, including through a function pointer, is a
|
||||
"virtual invocation", and will call the most-derived override of f().
|
||||
|
||||
Case studies
|
||||
|
||||
C++\Python class
|
||||
\___A_____B_____C_____D____E___
|
||||
|
|
||||
A | 1
|
||||
|
|
||||
B | 2 3
|
||||
|
|
||||
Bcb | 4 5 6
|
||||
|
|
||||
C | 7 8
|
||||
|
|
||||
|
||||
|
||||
1. Simple case
|
||||
|
||||
2. Python A holds a B*. Probably won't happen once we have forced
|
||||
downcasting.
|
||||
|
||||
Requires:
|
||||
x.f() -> 'B'
|
||||
call_f(x) -> 'B'
|
||||
|
||||
Implies: A.f invokes A::f() (virtually or otherwise)
|
||||
|
||||
3. Python B holds a B*.
|
||||
|
||||
Requires:
|
||||
x.f() -> 'B'
|
||||
call_f(x) -> 'B'
|
||||
|
||||
Implies: B.f invokes B::f (virtually or otherwise)
|
||||
|
||||
|
||||
4. B constructed from Python
|
||||
|
||||
Requires:
|
||||
|
||||
x.f() -> 'B'
|
||||
call_f(x) -> 'B'
|
||||
|
||||
Implies: B.f invokes B::f non-virtually. Bcb::f invokes B::f
|
||||
non-virtually.
|
||||
|
||||
Question: Does it help if we arrange for Python B construction to
|
||||
build a true B object? Then this case doesn't arise.
|
||||
|
||||
|
||||
5. D is a Python class derived from B
|
||||
|
||||
Requires:
|
||||
|
||||
x.f() -> 'D'
|
||||
call_f(x) -> 'D'
|
||||
|
||||
Implies: Bcb::f must invoke call_method to look up the Python
|
||||
method override, otherwise call_f wouldn't work.
|
||||
|
||||
6. E is like D, but doesn't override f
|
||||
|
||||
Requires:
|
||||
|
||||
x.f() -> 'B'
|
||||
call_f(x) -> 'B'
|
||||
|
||||
Implies: B.f invokes B::f non-virtually. If it were virtual, x.f()
|
||||
would cause infinite recursion, because we've already
|
||||
determined that Bcb::f must invoke call_method to look up
|
||||
the Python method override.
|
||||
|
||||
7. Python B object holds a C*
|
||||
|
||||
Requires:
|
||||
|
||||
x.f() -> 'C'
|
||||
call_f(x) -> 'C'
|
||||
|
||||
Implies: B.f invokes B::f virtually.
|
||||
|
||||
8. C object constructed from Python
|
||||
|
||||
Requires:
|
||||
|
||||
x.f() -> 'C'
|
||||
call_f(x) -> 'C'
|
||||
|
||||
Implies: nothing new.
|
||||
|
||||
------
|
||||
|
||||
Total implications:
|
||||
|
||||
2: A.f invokes A::f() (virtually or otherwise)
|
||||
3: B.f invokes B::f (virtually or otherwise)
|
||||
4: B.f invokes B::f non-virtually. Bcb::f invokes B::f non-virtually
|
||||
6: B.f invokes B::f non-virtually.
|
||||
7: B.f invokes B::f virtually.
|
||||
|
||||
5: Bcb::f invokes call_method to look up the Python method
|
||||
|
||||
Though (4) is avoidable, clearly 6 and 7 are not, and they
|
||||
conflict. The implication is that B.f must choose its behavior
|
||||
according to the type of the contained C++ object. If it is Bcb, a
|
||||
non-virtual call to B::f must occur. Otherwise, a virtual call to B::f
|
||||
must occur. This is essentially the same scheme we had with
|
||||
Boost.Python v1.
|
||||
|
||||
Note: in early versions of Boost.Python v1, we solved this problem by
|
||||
introducing a new Python class in the hierarchy, so that D and E
|
||||
actually derive from a B', and B'.f invokes B::f non-virtually, while
|
||||
B.f invokes B::f virtually. However, people complained about the
|
||||
artificial class in the hierarchy, which was revealed when they tried
|
||||
to do normal kinds of Python introspection.
|
||||
|
||||
-------
|
||||
|
||||
Assumption: we will have a function which builds a virtual function
|
||||
dispatch callable Python object.
|
||||
|
||||
make_virtual_function(pvmf, default_impl, call_policies, dispatch_type)
|
||||
|
||||
Pseudocode:
|
||||
|
||||
Get first argument from Python arg tuple
|
||||
if it contains dispatch_type
|
||||
call default_impl
|
||||
else
|
||||
call through pvmf
|
||||
|
||||
|
||||
Open questions:
|
||||
|
||||
1. What about Python multiple inheritance? Do we have the right
|
||||
check in the if clause above?
|
||||
|
||||
A: Not quite. The correct test looks like:
|
||||
|
||||
Deduce target type of pvmf, i.e. T in R(T::*)(A1...AN).
|
||||
Find holder in first argument which holds T
|
||||
if it holds dispatch_type...
|
||||
|
||||
2. Can we make this more efficient?
|
||||
|
||||
The current "returning" mechanism will look up a holder for T
|
||||
again. I don't know if we know how to avoid that.
|
||||
|
||||
|
||||
OK, the solution involves reworking the call mechanism. This is
|
||||
neccesary anyway in order to enable wrapping of function objects.
|
||||
|
||||
It can result in a reduction in the overall amount of source code,
|
||||
because returning<> won't need to be specialized for every
|
||||
combination of function and member function... though it will still
|
||||
need a void specialization. We will still need a way to dispatch to
|
||||
member functions through a regular function interface. mem_fn is
|
||||
almost the right tool, but it only goes up to 8
|
||||
arguments. Forwarding is tricky if you don't want to incur copies.
|
||||
I think the trick is to use arg_from_python<T>::result_type for each
|
||||
argument to the forwarder.
|
||||
|
||||
Another option would be to use separate function, function object,
|
||||
and member function dispatchers. Once you know you have a member
|
||||
function, you don't need cv-qualified overloads to call it.
|
||||
|
||||
Hmm, while we're at this, maybe we should solve the write-back
|
||||
converter problem. Can we do it? Maybe not. Ralf doesn't want to
|
||||
write special write-back functions here, does he? He wants the
|
||||
converter to do the work automatically. We could add
|
||||
cleanup/destructor registration. That would relieve the client from
|
||||
having accessible destructors for types which are being converted by
|
||||
rvalue. I'm not sure that this will really save any code,
|
||||
however. It rather depends on the linker, doesn't it? I wonder if
|
||||
this can be done in a backwards-compatible fashion by generating the
|
||||
delete function when it's not supplied?
|
||||
|
||||
|
||||
390
doc/projects.html
Normal file
@@ -0,0 +1,390 @@
|
||||
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
|
||||
|
||||
<html>
|
||||
<head>
|
||||
<meta name="generator" content=
|
||||
"HTML Tidy for Cygwin (vers 1st April 2002), see www.w3.org">
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<link rel="stylesheet" type="text/css" href="boost.css">
|
||||
|
||||
<title>Boost.Python - Projects using Boost.Python</title>
|
||||
</head>
|
||||
|
||||
<body link="#0000ff" vlink="#800080">
|
||||
<table border="0" cellpadding="7" cellspacing="0" width="100%" summary=
|
||||
"header">
|
||||
<tr>
|
||||
<td valign="top" width="300">
|
||||
<h3><a href="../../../index.htm"><img height="86" width="277" alt=
|
||||
"C++ Boost" src="../../../boost.png" border="0"></a></h3>
|
||||
</td>
|
||||
|
||||
<td valign="top">
|
||||
<h1 align="center"><a href="index.html">Boost.Python</a></h1>
|
||||
|
||||
<h2 align="center">Projects using Boost.Python</h2>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
<hr>
|
||||
|
||||
<h2>Introduction</h2>
|
||||
|
||||
<p>This is a partial list of projects using Boost.Python. If you are
|
||||
using Boost.Python as your Python/C++ binding solution, we'd be proud to
|
||||
list your project on this page. Just <a href=
|
||||
"mailto:c++-sig@python.org">post</a> a short description of your project
|
||||
and how Boost.Python helps you get the job done, and we'll add it to this
|
||||
page .</p>
|
||||
<hr>
|
||||
|
||||
<h3>Data Analysis</h3>
|
||||
|
||||
<dl class="page-index">
|
||||
<dt><b><a href=
|
||||
"http://www.neuralynx.com/neuralab/index.htm">NeuraLab</a></b></dt>
|
||||
|
||||
<dd>Neuralab is a data analysis environment specifically tailored for
|
||||
neural data from <a href="http://www.neuralynx.com">Neuralynx</a>
|
||||
acquisition systems. Neuralab combines presentation quality graphics, a
|
||||
numerical analysis library, and the <a href=
|
||||
"http://www.python.org">Python</a> scripting engine in a single
|
||||
application. With Neuralab, Neuralynx users can perform common analysis
|
||||
tasks with just a few mouse clicks. More advanced users can create
|
||||
custom Python scripts, which can optionally be assigned to menus and
|
||||
mouse clicks.</dd>
|
||||
</dl>
|
||||
|
||||
<dl class="page-index">
|
||||
<dt><b>TSLib</b> - <a href="http://www.fortressinv.com">Fortress
|
||||
Investment Group LLC</a></dt>
|
||||
|
||||
<dd>
|
||||
Fortress Investment Group has contracted <a href=
|
||||
"http://www.boost-consulting.com">Boost Consulting</a> to develop
|
||||
core internal financial analysis tools in C++ and to prepare Python
|
||||
bindings for them using Boost.Python.
|
||||
|
||||
<p>Tom Barket of Fortress writes:</p>
|
||||
|
||||
<blockquote>
|
||||
We have a large C++ analytical library specialized for research in
|
||||
finance and economics, built for speed and mission critical
|
||||
stability. Yet Python offers us the flexibility to test out new
|
||||
ideas quickly and increase the productivity of our time versus
|
||||
working in C++. There are several key features which make Python
|
||||
stand out. Its elegance, stability, and breadth of resources on the
|
||||
web are all valuable, but the most important is its extensibility,
|
||||
due to its open source transparency. Boost.Python makes Python
|
||||
extensibility extremely simple and straightforward, yet preserves a
|
||||
great deal of power and control.
|
||||
</blockquote>
|
||||
</dd>
|
||||
</dl>
|
||||
|
||||
<h3>Educational</h3>
|
||||
|
||||
<dl class="page-index">
|
||||
<dt><a href="http://edu.kde.org/kig"><b>Kig</b></a></dt>
|
||||
|
||||
<dd>
|
||||
<p>KDE Interactive Geometry is a high-school level educational tool,
|
||||
built for the KDE desktop. It is a nice tool to let students work
|
||||
with geometrical constructions. It is meant to be the most intuitive,
|
||||
yet featureful application of its kind.</p>
|
||||
|
||||
<p>Versions after 0.6.x (will) support objects built by the user
|
||||
himself in the Python language. The exporting of the relevant
|
||||
internal API's were done using Boost.Python, which made the process
|
||||
very easy.</p>
|
||||
</dd>
|
||||
</dl>
|
||||
|
||||
<h3>Enterprise Software</h3>
|
||||
|
||||
<dl class="page-index">
|
||||
<dt><b><a href="http://openwbem.sourceforge.net">OpenWBEM</a></b></dt>
|
||||
|
||||
<dd>
|
||||
The OpenWBEM project is an effort to develop an open-source
|
||||
implementation of Web Based Enterprise Management suitable for
|
||||
commercial and non-commercial application
|
||||
|
||||
<p><a href="mailto:dnuffer@sco.com">Dan Nuffer</a> writes:</p>
|
||||
|
||||
<blockquote>
|
||||
I'm using Boost.Python to wrap the client API of OpenWBEM.This will
|
||||
make it easier to do rapid prototyping, testing, and scripting when
|
||||
developing management solutions that use WBEM.
|
||||
</blockquote>
|
||||
</dd>
|
||||
|
||||
<dt><b><a href="http://www.transversal.com">Metafaq</a></b></dt>
|
||||
|
||||
<dd>
|
||||
Metafaq, from <a href="http://www.transversal.com">Transversal,
|
||||
Inc.</a>, is an enterprise level online knowledge base management
|
||||
system.
|
||||
|
||||
<p><a href="mailto:ben.young-at-transversal.com">Ben Young</a>
|
||||
writes:</p>
|
||||
|
||||
<blockquote>
|
||||
Boost.Python is used in an automated process to generate python
|
||||
bindings to our api which is exposed though multiple backends and
|
||||
frontends. This allows us to write quick tests and bespoke scripts
|
||||
to perform one off tasks without having to go through the full
|
||||
compilation cycle.
|
||||
</blockquote>
|
||||
</dd>
|
||||
</dl>
|
||||
|
||||
<h3>Games</h3>
|
||||
|
||||
<dl class="page-index">
|
||||
<dt><b><a href="http://vegastrike.sourceforge.net">Vega
|
||||
Strike</a></b></dt>
|
||||
|
||||
<dd>
|
||||
<a href="http://vegastrike.sourceforge.net">Vega Strike</a> is the 3D
|
||||
Space Simulator that allows you to trade and bounty hunt in a vast
|
||||
universe. Players face dangers, decisions, piracy, and aliens.
|
||||
|
||||
<p><a href="http://vegastrike.sourceforge.net">Vega Strike</a> has
|
||||
decided to base its scripting on python, using boost as the layer
|
||||
between the class hierarchy in python and the class hierarchy in C++.
|
||||
The result is a very flexible scripting system that treats units as
|
||||
native python classes when designing missions or writing AI's.</p>
|
||||
|
||||
<p>A large economic and planetary simulation is currently being run
|
||||
in the background in python and the results are returned back into
|
||||
C++ in the form of various factions' spaceships appearing near worlds
|
||||
that they are simulated to be near in python if the player is in the
|
||||
general neighborhood.</p>
|
||||
</dd>
|
||||
</dl>
|
||||
|
||||
<h3>Graphics</h3>
|
||||
|
||||
<dl class="page-index">
|
||||
<dt><b><a href="http://sourceforge.net/projects/pyosg">OpenSceneGraph
|
||||
Bindings</a></b></dt>
|
||||
|
||||
<dd><a href="mailto:gideon@computer.org">Gideon May</a> has created a
|
||||
set of bindings for <a href=
|
||||
"http://www.openscenegraph.org">OpenSceneGraph</a>, a cross-platform
|
||||
C++/OpenGL library for the real-time visualization.<br>
|
||||
</dd>
|
||||
|
||||
<dt><b><a href=
|
||||
"http://www.slac.stanford.edu/grp/ek/hippodraw/index.html">HippoDraw</a></b></dt>
|
||||
|
||||
<dd>
|
||||
HippoDraw is a data analysis environment consisting of a canvas upon
|
||||
which graphs such as histograms, scattter plots, etc, are prsented.
|
||||
It has a highly interactive GUI interface, but some things you need
|
||||
to do with scripts. HippoDraw can be run as Python extension module
|
||||
so that all the manipulation can be done from either Python or the
|
||||
GUI.
|
||||
|
||||
<p>Before the web page came online, <a href=
|
||||
"mailto:Paul_Kunz@SLAC.Stanford.EDU">Paul F. Kunz</a> wrote:</p>
|
||||
|
||||
<blockquote>
|
||||
Don't have a web page for the project, but the organization's is <a
|
||||
href=
|
||||
"http://www.slac.stanford.edu">http://www.slac.stanford.edu</a>
|
||||
(the first web server site in America, I installed it).
|
||||
</blockquote>
|
||||
Which was just too cool a piece of trivia to omit.<br>
|
||||
|
||||
</dd>
|
||||
|
||||
<dt><a href="http://www.iplt.org"><b>IPLT</b></a></dt>
|
||||
|
||||
<dd>
|
||||
<a href="mailto:ansgar.philippsen-at-unibas.ch">Ansgar
|
||||
Philippsen</a> writes:
|
||||
|
||||
<blockquote>
|
||||
IPLT is an image processing library and toolbox for the structural
|
||||
biology electron microscopy community. I would call it a
|
||||
budding/evolving project, since it is currently not in production
|
||||
stage, but rather under heavy development. Python is used as the
|
||||
main scripting/interaction level, but also for rapid prototyping,
|
||||
since the underlying C++ class library is pretty much fully exposed
|
||||
via boost.python (at least the high-level interface). The combined
|
||||
power of C++ and Python for this project turned out to be just
|
||||
awesome.
|
||||
</blockquote>
|
||||
<br>
|
||||
|
||||
</dd>
|
||||
|
||||
<dt><a href=
|
||||
"http://www.procoders.net/pythonmagick"><b>PythonMagick</b></a></dt>
|
||||
|
||||
<dd>PythonMagick binds the <a href=
|
||||
"http://www.graphicsmagick.org">GraphicsMagick</a> image manipulation
|
||||
library to Python.<br>
|
||||
</dd>
|
||||
</dl>
|
||||
|
||||
<h3>Scientific Computing</h3>
|
||||
|
||||
<dl class="page index">
|
||||
<dt><a href="http://camfr.sourceforge.net"><b>CAMFR</b></a></dt>
|
||||
|
||||
<dd>
|
||||
CAMFR is a photonics and electromagnetics modelling tool. Python is
|
||||
used for computational steering.
|
||||
|
||||
<p><a href="mailto:Peter.Bienstman@rug.ac.be">Peter Bienstman</a>
|
||||
writes:</p>
|
||||
|
||||
<blockquote>
|
||||
Thanks for providing such a great tool!
|
||||
</blockquote>
|
||||
</dd>
|
||||
|
||||
<dt><a href="http://cctbx.sourceforge.net"><b>cctbx - Computational
|
||||
Crystallography Toolbox</b></a></dt>
|
||||
|
||||
<dd>
|
||||
Computational Crystallography is concerned with the derivation of
|
||||
atomic models of crystal structures, given experimental X-ray
|
||||
diffraction data. The cctbx is an open-source library of fundamental
|
||||
algorithms for crystallographic computations. The core algorithms are
|
||||
implemented in C++ and accessed through higher-level Python
|
||||
interfaces.
|
||||
|
||||
<p>The cctbx grew together with Boost.Python and is designed from the
|
||||
ground up as a hybrid Python/C++ system. With one minor exception,
|
||||
run-time polymorphism is completely handled by Python. C++
|
||||
compile-time polymorphism is used to implement performance critical
|
||||
algorithms. The Python and C++ layers are seamlessly integrated using
|
||||
Boost.Python.</p>
|
||||
|
||||
<p>The SourceForge cctbx project is organized in modules to
|
||||
facilitate use in non-crystallographic applications. The scitbx
|
||||
module implements a general purpose array family for scientific
|
||||
applications and pure C++ ports of FFTPACK and the LBFGS conjugate
|
||||
gradient minimizer.</p>
|
||||
</dd>
|
||||
|
||||
<dt><a href="http://www.llnl.gov/CASC/emsolve"><b>EMSolve</b></a></dt>
|
||||
|
||||
<dd>EMSolve is a provably stable, charge conserving, and energy
|
||||
conserving solver for Maxwell's equations.<br>
|
||||
</dd>
|
||||
|
||||
<dt><b><a href="http://cern.ch/gaudi">Gaudi</a></b> and <b><a href=
|
||||
"http://cern.ch/Gaudi/RootPython/">RootPython</a></b></dt>
|
||||
|
||||
<dd>
|
||||
Gaudi is a framework for particle physics collision data processing
|
||||
applications developed in the context of the LHCb and ATLAS
|
||||
experiments at CERN.
|
||||
|
||||
<p><a href="mailto:Pere.Mato@cern.ch">Pere Mato Vila</a> writes:</p>
|
||||
|
||||
<blockquote>
|
||||
We are using Boost.Python to provide scripting/interactive
|
||||
capability to our framework. We have a module called "GaudiPython"
|
||||
implemented using Boost.Python that allows the interaction with any
|
||||
framework service or algorithm from python. RootPython also uses
|
||||
Boost.Python to provide a generic "gateway" between the <a href=
|
||||
"http://root.cern.ch">ROOT</a> framework and python
|
||||
|
||||
<p>Boost.Python is great. We managed very quickly to interface our
|
||||
framework to python, which is great language. We are trying to
|
||||
facilitate to our physicists (end-users) a rapid analysis
|
||||
application development environment based on python. For that,
|
||||
Boost.Python plays and essential role.</p>
|
||||
</blockquote>
|
||||
</dd>
|
||||
|
||||
<dt><b><a href="http://www.esss.com.br">ESSS</a></b></dt>
|
||||
|
||||
<dd>
|
||||
ESSS (Engineering Simulation and Scientific Software) is a company
|
||||
that provides engineering solutions and acts in the brazilian and
|
||||
south-american market providing products and services related to
|
||||
Computational Fluid Dynamics and Image Analysis.
|
||||
|
||||
<p><a href="mailto:bruno@esss.com.br">Bruno da Silva de Oliveira</a>
|
||||
writes:</p>
|
||||
|
||||
<blockquote>
|
||||
Recently we moved our work from working exclusively with C++ to an
|
||||
hybrid-language approach, using Python and C++, with Boost.Python
|
||||
providing the layer between the two. The results are great so far!
|
||||
</blockquote>
|
||||
|
||||
<p>Two projects have been developed so far with this technology:</p>
|
||||
|
||||
<p><b><a href="http://www.esss.com.br/dev_simba.phtml">Simba</a></b>
|
||||
provides 3D visualization of geological formations gattered from the
|
||||
simulation of the evolution of oil systems, allowing the user to
|
||||
analyse various aspects of the simulation, like deformation, pressure
|
||||
and fluids, along the time of the simulation.</p>
|
||||
|
||||
<p><b><a href="http://www.esss.com.br/dev_aero.phtml">Aero</a></b>
|
||||
aims to construct a CFD with brazilian technology, which involves
|
||||
various companies and universities. ESSS is responsible for various
|
||||
of the application modules, including GUI and post-processing of
|
||||
results.</p>
|
||||
</dd>
|
||||
|
||||
<dt><b><a href="http://www.rationaldiscovery.com">Rational Discovery
|
||||
LLC</a></b></dt>
|
||||
|
||||
<dd>
|
||||
Rational Discovery provides computational modeling, combinatorial
|
||||
library design and custom software development services to the
|
||||
pharmaceutical, biotech and chemical industries. We do a substantial
|
||||
amount of internal research to develop new approaches for applying
|
||||
machine-learning techniques to solve chemical problems. Because we're
|
||||
a small organization and chemistry is a large and complex field, it
|
||||
is essential that we be able to quickly and easily prototype and test
|
||||
new algorithms.
|
||||
|
||||
<p>For our internal software, we implement core data structures in C
|
||||
and expose them to Python using Boost.Python. Algorithm development
|
||||
is done in Python and then translated to C if required (often it's
|
||||
not). This hybrid development approach not only greatly increases our
|
||||
productivity, but it also allows "non-developers" (people without C
|
||||
experience) to take part in method development. Learning C is a
|
||||
daunting task, but "Python fits your brain." (Thanks to Bruce Eckel
|
||||
for the quote.)</p>
|
||||
</dd>
|
||||
</dl>
|
||||
|
||||
<h3>Tools</h3>
|
||||
|
||||
<dl>
|
||||
<dt><a href="http://www.jayacard.org"><b>Jayacard</b></a></dt>
|
||||
|
||||
<dd>
|
||||
Jayacard aims at developing a secure portable open source operating
|
||||
system for contactless smart cards and a complete suite of high
|
||||
quality development tools to ease smart card OS and application
|
||||
development.
|
||||
|
||||
<p>The core of the smart card reader management is written in C++ but
|
||||
all the development tools are written in the friendly Python
|
||||
language. Boost plays the fundamental role of binding the tools to
|
||||
our core smart card reader library.</p>
|
||||
</dd>
|
||||
</dl>
|
||||
<hr>
|
||||
|
||||
<p>Revised
|
||||
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
|
||||
15 July, 2003</p>
|
||||
|
||||
<p><i>© Copyright <a href="../../../people/dave_abrahams.htm">Dave
|
||||
Abrahams</a> 2002-2003. </i></p>
|
||||
</body>
|
||||
</html>
|
||||
|
||||
106
doc/richcmp.html
@@ -1,106 +0,0 @@
|
||||
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0//EN"
|
||||
"http://www.w3.org/TR/REC-html40/strict.dtd">
|
||||
|
||||
<title>Rich Comparisons</title>
|
||||
|
||||
<div>
|
||||
|
||||
<img src="../../../c++boost.gif"
|
||||
alt="c++boost.gif (8819 bytes)"
|
||||
align="center"
|
||||
width="277" height="86">
|
||||
|
||||
<hr>
|
||||
<h1>Rich Comparisons</h1>
|
||||
|
||||
<hr>
|
||||
In Python versions up to and including Python 2.0, support for
|
||||
implementing comparisons on user-defined classes and extension types
|
||||
was quite simple. Classes could implement a <tt>__cmp__</tt> method
|
||||
that was given two instances of a class as arguments, and could only
|
||||
return <tt>0</tt> if they were equal or <tt>+1</tt> or <tt>-1</tt> if
|
||||
they were not. The method could not raise an exception or return
|
||||
anything other than an integer value.
|
||||
In Python 2.1, <b>Rich Comparisons</b> were added (see
|
||||
<a href="http://python.sourceforge.net/peps/pep-0207.html">PEP 207</a>).
|
||||
Python classes can now individually overload each of the <, <=,
|
||||
>, >=, ==, and != operations.
|
||||
|
||||
<p>
|
||||
For more detailed information, search for "rich comparison"
|
||||
<a href="http://www.python.org/doc/current/ref/customization.html"
|
||||
>here</a>.
|
||||
|
||||
<p>
|
||||
Boost.Python supports both automatic overloading and manual overloading
|
||||
of the Rich Comparison operators. The <b>compile-time</b> support is
|
||||
independent of the Python version that is used when compiling
|
||||
Boost.Python extension modules. That is, <tt>op_lt</tt> for example can
|
||||
always be used, and the C++ <tt>operator<</tt> will always be bound
|
||||
to the Python method <tt>__lt__</tt>. However, the <b>run-time</b>
|
||||
behavior will depend on the Python version.
|
||||
|
||||
<p>
|
||||
With Python versions before 2.1, the Rich Comparison operators will not
|
||||
be called by Python when any of the six comparison operators
|
||||
(<tt><</tt>, <tt><=</tt>, <tt>==</tt>, <tt>!=</tt>,
|
||||
<tt>></tt>, <tt>>=</tt>) is used in an expression. The only way
|
||||
to access the corresponding methods is to call them explicitly, e.g.
|
||||
<tt>a.__lt__(b)</tt>. Only with Python versions 2.1 or higher will
|
||||
expressions like <tt>a < b</tt> work as expected.
|
||||
|
||||
<p>
|
||||
To support Rich Comparisions, the Python C API was modified between
|
||||
Python versions 2.0 and 2.1. A new slot was introduced in the
|
||||
<tt>PyTypeObject</tt> structure: <tt>tp_richcompare</tt>. For backwards
|
||||
compatibility, a flag (<tt>Py_TPFLAGS_HAVE_RICHCOMPARE</tt>) has to be
|
||||
set to signal to the Python interpreter that Rich Comparisions are
|
||||
supported by a particular type.
|
||||
There is only one flag for all the six comparison operators.
|
||||
When any of the six operators is wrapped automatically or
|
||||
manually, Boost.Python will set this flag. Attempts to use comparison
|
||||
operators at the Python level that are not defined at the C++ level
|
||||
will then lead to an <tt>AttributeError</tt> when the Python 2.1
|
||||
(or higher) interpreter tries, e.g., <tt>a.__lt__(b)</tt>. That
|
||||
is, in general all six operators should be supplied. Automatically
|
||||
wrapped operators and manually wrapped operators can be mixed. For
|
||||
example:<pre>
|
||||
boost::python::class_builder<code> py_code(this_module, "code");
|
||||
|
||||
py_code.def(boost::python::constructor<>());
|
||||
py_code.def(boost::python::constructor<int>());
|
||||
py_code.def(boost::python::operators<( boost::python::op_eq
|
||||
| boost::python::op_ne)>());
|
||||
py_code.def(NotImplemented, "__lt__");
|
||||
py_code.def(NotImplemented, "__le__");
|
||||
py_code.def(NotImplemented, "__gt__");
|
||||
py_code.def(NotImplemented, "__ge__");
|
||||
</pre>
|
||||
|
||||
<tt>NotImplemented</tt> is a simple free function that (currently) has
|
||||
to be provided by the user. For example:<pre>
|
||||
boost::python::ref
|
||||
NotImplemented(const code&, const code&) {
|
||||
return
|
||||
boost::python::ref(Py_NotImplemented, boost::python::ref::increment_count);
|
||||
}
|
||||
</pre>
|
||||
|
||||
See also:
|
||||
<ul>
|
||||
<li><a href="../example/richcmp1.cpp"><tt>../example/richcmp1.cpp</tt></a>
|
||||
<li><a href="../example/richcmp2.cpp"><tt>../example/richcmp2.cpp</tt></a>
|
||||
<li><a href="../example/richcmp3.cpp"><tt>../example/richcmp3.cpp</tt></a>
|
||||
</ul>
|
||||
|
||||
<hr>
|
||||
© Copyright Nicholas K. Sauter & Ralf W. Grosse-Kunstleve 2001.
|
||||
Permission to copy, use, modify, sell and distribute this document is
|
||||
granted provided this copyright notice appears in all copies. This
|
||||
document is provided "as is" without express or implied warranty, and
|
||||
with no claim as to its suitability for any purpose.
|
||||
|
||||
<p>
|
||||
Updated: July 2001
|
||||
|
||||
</div>
|
||||
973
doc/special.html
@@ -1,973 +0,0 @@
|
||||
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
|
||||
<title>
|
||||
Special Method and Operator Support
|
||||
</title>
|
||||
<div>
|
||||
<h1>
|
||||
<img width="277" height="86" id="_x0000_i1025" align="middle" src=
|
||||
"../../../c++boost.gif" alt="c++boost.gif (8819 bytes)">Special Method and
|
||||
Operator Support
|
||||
</h1>
|
||||
<h2>
|
||||
Overview
|
||||
</h2>
|
||||
<p>
|
||||
Boost.Python supports all of the standard <a href=
|
||||
"http://www.python.org/doc/current/ref/specialnames.html">
|
||||
special method names</a> supported by real Python class instances <em>
|
||||
except</em> <code>__complex__</code> (more on the reasons <a href=
|
||||
"#reasons">below</a>). In addition, it can quickly and easily expose
|
||||
suitable C++ functions and operators as Python operators. The following
|
||||
categories of special method names are supported:
|
||||
<ul>
|
||||
<li><a href="#general">Basic Customization</a>
|
||||
<li><a href="#numeric">Numeric Operators</a>
|
||||
<li><a href="#sequence_and_mapping">Sequence and Mapping protocols</a>
|
||||
<li><a href="#getter_setter">Attribute Getters and Setters</a>
|
||||
</ul>
|
||||
|
||||
<h2><a name="general">Basic Customization</a></h2>
|
||||
|
||||
|
||||
<p>
|
||||
Python provides a number of special operators for basic customization of a
|
||||
class. Only a brief description is provided below; more complete
|
||||
documentation can be found <a
|
||||
href="http://www.python.org/doc/current/ref/customization.html">here</a>.
|
||||
|
||||
<dl>
|
||||
<dt>
|
||||
<b><tt class='method'>__init__</tt></b>(<i>self</i>)
|
||||
<dd>
|
||||
Initialize the class instance. For extension classes not subclassed in
|
||||
Python, <code> __init__</code> is defined by
|
||||
|
||||
<pre> my_class.def(boost::python::constructor<...>())</pre>
|
||||
|
||||
(see section <a href="example1.html">"A Simple Example Using Boost.Python"</a>).<p>
|
||||
<dt>
|
||||
<b><tt class='method'>__del__</tt></b>(<i>self</i>)
|
||||
<dd>
|
||||
Called when the extension instance is about to be destroyed. For extension classes
|
||||
not subclassed in Python, <code> __del__</code> is always defined automatically by
|
||||
means of the class' destructor.
|
||||
<dt>
|
||||
<b><tt class='method'>__repr__</tt></b>(<i>self</i>)
|
||||
<dd>
|
||||
Create a string representation from which the object can be
|
||||
reconstructed.
|
||||
<dt>
|
||||
<b><tt class='method'>__str__</tt></b>(<i>self</i>)
|
||||
<dd>
|
||||
Create a string representation which is suitable for printing.
|
||||
<dt>
|
||||
<b><tt class='method'>__lt__</tt></b>(<i>self, other</i>)
|
||||
<dt>
|
||||
<b><tt class='method'>__le__</tt></b>(<i>self, other</i>)
|
||||
<dt>
|
||||
<b><tt class='method'>__eq__</tt></b>(<i>self, other</i>)
|
||||
<dt>
|
||||
<b><tt class='method'>__ne__</tt></b>(<i>self, other</i>)
|
||||
<dt>
|
||||
<b><tt class='method'>__gt__</tt></b>(<i>self, other</i>)
|
||||
<dt>
|
||||
<b><tt class='method'>__ge__</tt></b>(<i>self, other</i>)
|
||||
<dd>
|
||||
Rich Comparison methods.
|
||||
New in Python 2.1.
|
||||
See <a href="richcmp.html">Rich Comparisons</a>.
|
||||
<dt>
|
||||
<b><tt class='method'>__cmp__</tt></b>(<i>self, other</i>)
|
||||
<dd>
|
||||
Three-way compare function.
|
||||
See <a href="richcmp.html">Rich Comparisons</a>.
|
||||
<dt>
|
||||
<b><tt class='method'>__hash__</tt></b>(<i>self</i>)
|
||||
<dd>
|
||||
Called for the key object for dictionary operations, and by the
|
||||
built-in function hash(). Should return a 32-bit integer usable as a
|
||||
hash value for dictionary operations (only allowed if __cmp__ is also
|
||||
defined)
|
||||
<dt>
|
||||
<b><tt class='method'>__nonzero__</tt></b>(<i>self</i>)
|
||||
<dd>
|
||||
called if the object is used as a truth value (e.g. in an if
|
||||
statement)
|
||||
<dt>
|
||||
<b><tt class='method'>__call__</tt></b> (<var>self</var><big>[</big><var>, args...</var><big>]</big>)
|
||||
<dd>
|
||||
Called when the instance is ``called'' as a function; if this method
|
||||
is defined, <code><var>x</var>(arg1, arg2, ...)</code> is a shorthand for
|
||||
<code><var>x</var>.__call__(arg1, arg2, ...)</code>.
|
||||
</dl>
|
||||
|
||||
If we have a suitable C++ function that supports any of these features,
|
||||
we can export it like any other function, using its Python special name.
|
||||
For example, suppose that class <code>Foo</code> provides a string
|
||||
conversion function:
|
||||
<blockquote><pre>
|
||||
std::string to_string(Foo const& f)
|
||||
{
|
||||
std::ostringstream s;
|
||||
s << f;
|
||||
return s.str();
|
||||
}
|
||||
</pre></blockquote>
|
||||
This function would be wrapped like this:
|
||||
<blockquote><pre>
|
||||
boost::python::class_builder<Foo> foo_class(my_module, "Foo");
|
||||
foo_class.def(&to_string, "__str__");
|
||||
</pre></blockquote>
|
||||
Note that Boost.Python also supports <em>automatic wrapping</em> of
|
||||
<code>__str__</code> and <code>__cmp__</code>. This is explained in the <a
|
||||
href="#numeric">next section</a> and the <a href="#numeric_table">Table of
|
||||
Automatically Wrapped Methods</a>.
|
||||
|
||||
<h2><a name="numeric">Numeric Operators</a></h2>
|
||||
|
||||
<p>
|
||||
Numeric operators can be exposed manually, by <code>def</code>ing C++
|
||||
[member] functions that support the standard Python <a
|
||||
href="http://www.python.org/doc/current/ref/numeric-types.html">numeric
|
||||
protocols</a>. This is the same basic technique used to expose
|
||||
<code>to_string()</code> as <code>__str__()</code> above, and is <a
|
||||
href="#numeric_manual">covered in detail below</a>. Boost.Python also supports
|
||||
<i>automatic wrapping</i> of numeric operators whenever they have already
|
||||
been defined in C++.
|
||||
|
||||
<h3><a name="numeric_auto">Exposing C++ Operators Automatically</a></h3>
|
||||
|
||||
<p>
|
||||
Supose we wanted to expose a C++ class
|
||||
<code>BigNum</code> which supports addition. That is, in C++ we can write:
|
||||
<blockquote><pre>
|
||||
BigNum a, b, c;
|
||||
...
|
||||
c = a + b;
|
||||
</pre></blockquote>
|
||||
<p>
|
||||
To enable the same functionality in Python, we first wrap the <code>
|
||||
BigNum</code> class as usual:
|
||||
<blockquote><pre>
|
||||
boost::python::class_builder<BigNum> bignum_class(my_module, "BigNum");
|
||||
bignum_class.def(boost::python::constructor<>());
|
||||
...
|
||||
</pre></blockquote>
|
||||
Then we export the addition operator like this:
|
||||
|
||||
<blockquote><pre>
|
||||
bignum_class.def(boost::python::operators<boost::python::op_add>());
|
||||
</pre></blockquote>
|
||||
|
||||
Since BigNum also supports subtraction, multiplication, and division, we
|
||||
want to export those also. This can be done in a single command by
|
||||
``or''ing the operator identifiers together (a complete list of these
|
||||
identifiers and the corresponding operators can be found in the <a href=
|
||||
"#numeric_table">Table of Automatically Wrapped Methods</a>):
|
||||
<blockquote><pre>
|
||||
bignum_class.def(boost::python::operators<(boost::python::op_sub | boost::python::op_mul | boost::python::op_div)>());
|
||||
</pre></blockquote>
|
||||
[Note that the or-expression must be enclosed in parentheses.]
|
||||
|
||||
<p>This form of operator definition can be used to wrap unary and
|
||||
homogeneous binary operators (a <i>homogeneous</i> operator has left and
|
||||
right operands of the same type). Now suppose that our C++ library also
|
||||
supports addition of BigNums and plain integers:
|
||||
|
||||
<blockquote><pre>
|
||||
BigNum a, b;
|
||||
int i;
|
||||
...
|
||||
a = b + i;
|
||||
a = i + b;
|
||||
</pre></blockquote>
|
||||
To wrap these heterogeneous operators, we need to specify a different type for
|
||||
one of the operands. This is done using the <code>right_operand</code>
|
||||
and <code>left_operand</code> templates:
|
||||
<blockquote><pre>
|
||||
bignum_class.def(boost::python::operators<boost::python::op_add>(), boost::python::right_operand<int>());
|
||||
bignum_class.def(boost::python::operators<boost::python::op_add>(), boost::python::left_operand<int>());
|
||||
</pre></blockquote>
|
||||
Boost.Python uses overloading to register several variants of the same
|
||||
operation (more on this in the context of <a href="#coercion">
|
||||
coercion</a>). Again, several operators can be exported at once:
|
||||
<blockquote><pre>
|
||||
bignum_class.def(boost::python::operators<(boost::python::op_sub | boost::python::op_mul | boost::python::op_div)>(),
|
||||
boost::python::right_operand<int>());
|
||||
bignum_class.def(boost::python::operators<(boost::python::op_sub | boost::python::op_mul | boost::python::op_div)>(),
|
||||
boost::python::left_operand<int>());
|
||||
</pre></blockquote>
|
||||
The type of the operand not mentioned is taken from the class being wrapped. In
|
||||
our example, the class object is <code>bignum_class</code>, and thus the
|
||||
other operand's type is ``<code>BigNum const&</code>''. You can override
|
||||
this default by explicitly specifying a type in the <code>
|
||||
operators</code> template:
|
||||
<blockquote><pre>
|
||||
bignum_class.def(boost::python::operators<boost::python::op_add, BigNum>(), boost::python::right_operand<int>());
|
||||
</pre></blockquote>
|
||||
<p>
|
||||
Note that automatic wrapping uses the <em>expression</em>
|
||||
``<code>left + right</code>'' and can be used uniformly
|
||||
regardless of whether the C++ operators are supplied as free functions
|
||||
|
||||
<blockquote><pre>
|
||||
BigNum operator+(BigNum, BigNum)
|
||||
</pre></blockquote>
|
||||
|
||||
or as member functions
|
||||
|
||||
<blockquote><pre>
|
||||
BigNum::operator+(BigNum).
|
||||
</pre></blockquote>
|
||||
|
||||
<p>
|
||||
For the Python built-in functions <code>pow()</code> and
|
||||
<code>abs()</code>, there is no corresponding C++ operator. Instead,
|
||||
automatic wrapping attempts to wrap C++ functions of the same name. This
|
||||
only works if those functions are known in namespace
|
||||
<code>python</code>. On some compilers (e.g. MSVC) it might be
|
||||
necessary to add a using declaration prior to wrapping:
|
||||
|
||||
<blockquote><pre>
|
||||
namespace boost { namespace python {
|
||||
using my_namespace::pow;
|
||||
using my_namespace::abs;
|
||||
}
|
||||
</pre></blockquote>
|
||||
|
||||
<h3><a name="numeric_manual">Wrapping Numeric Operators Manually</a></h3>
|
||||
<p>
|
||||
In some cases, automatic wrapping of operators may be impossible or
|
||||
undesirable. Suppose, for example, that the modulo operation for BigNums
|
||||
is defined by a set of functions called <code>mod()</code>:
|
||||
|
||||
<blockquote><pre>
|
||||
BigNum mod(BigNum const& left, BigNum const& right);
|
||||
BigNum mod(BigNum const& left, int right);
|
||||
BigNum mod(int left, BigNum const& right);
|
||||
</pre></blockquote>
|
||||
|
||||
<p>
|
||||
For automatic wrapping of the modulo function, <code>operator%()</code> would be needed.
|
||||
Therefore, the <code>mod()</code>-functions must be wrapped manually. That is, we have
|
||||
to export them explicitly with the Python special name "__mod__":
|
||||
|
||||
<blockquote><pre>
|
||||
bignum_class.def((BigNum (*)(BigNum const&, BigNum const&))&mod, "__mod__");
|
||||
bignum_class.def((BigNum (*)(BigNum const&, int))&mod, "__mod__");
|
||||
</pre></blockquote>
|
||||
|
||||
<p>
|
||||
The third form of <code>mod()</code> (with <code>int</code> as left operand) cannot
|
||||
be wrapped directly. We must first create a function <code>rmod()</code> with the
|
||||
operands reversed:
|
||||
|
||||
<blockquote><pre>
|
||||
BigNum rmod(BigNum const& right, int left)
|
||||
{
|
||||
return mod(left, right);
|
||||
}
|
||||
</pre></blockquote>
|
||||
|
||||
This function must be wrapped under the name "__rmod__" (standing for "reverse mod"):
|
||||
|
||||
<blockquote><pre>
|
||||
bignum_class.def(&rmod, "__rmod__");
|
||||
</pre></blockquote>
|
||||
|
||||
Many of the possible operator names can be found in the <a href=
|
||||
"#numeric_table">Table of Automatically Wrapped Methods</a>. Special treatment is
|
||||
necessary to export the <a href="#ternary_pow">ternary pow</a> operator.
|
||||
|
||||
<p>
|
||||
Automatic and manual wrapping can be mixed arbitrarily. Note that you
|
||||
cannot overload the same operator for a given extension class on both
|
||||
``<code>int</code>'' and ``<code>float</code>'', because Python implicitly
|
||||
converts these types into each other. Thus, the overloaded variant
|
||||
found first (be it ``<code>int</code>`` or ``<code>float</code>'') will be
|
||||
used for either of the two types.
|
||||
|
||||
<h3><a name="inplace">Inplace Operators</a></h3>
|
||||
<p>
|
||||
Boost.Python can also be used to expose inplace numeric operations
|
||||
(i.e., <code>+=</code> and so forth). These operators must be wrapped
|
||||
manually, as described in the previous section. For example, suppose
|
||||
the class BigNum has an <code>operator+=</code>:
|
||||
|
||||
<blockquote><pre>
|
||||
BigNum& operator+= (BigNum const& right);
|
||||
</pre></blockquote>
|
||||
|
||||
This can be exposed by first writing a wrapper function:
|
||||
|
||||
<blockquote><pre>
|
||||
BigNum& iadd (BigNum& self, const BigNum& right)
|
||||
{
|
||||
return self += right;
|
||||
}
|
||||
</pre></blockquote>
|
||||
|
||||
and then exposing the wrapper with
|
||||
|
||||
<blockquote><pre>
|
||||
bignum_class.def(&iadd, "__iadd__");
|
||||
</pre></blockquote>
|
||||
|
||||
|
||||
|
||||
|
||||
<h3><a name="coercion">Coercion</a></h3>
|
||||
|
||||
|
||||
Plain Python can only execute operators with identical types on the left
|
||||
and right hand side. If it encounters an expression where the types of
|
||||
the left and right operand differ, it tries to coerce these types to a
|
||||
common type before invoking the actual operator. Implementing good
|
||||
coercion functions can be difficult if many type combinations must be
|
||||
supported.
|
||||
<p>
|
||||
Boost.Python solves this problem the same way that C++ does: with <em><a
|
||||
href="overloading.html">overloading</a></em>. This technique drastically
|
||||
simplifies the code neccessary to support operators: you just register
|
||||
operators for all desired type combinations, and Boost.Python automatically
|
||||
ensures that the correct function is called in each case; there is no
|
||||
need for user-defined coercion functions. To enable operator
|
||||
overloading, Boost.Python provides a standard coercion which is <em>implicitly
|
||||
registered</em> whenever automatic operator wrapping is used.
|
||||
<p>
|
||||
If you wrap all operator functions manually, but still want to use
|
||||
operator overloading, you have to register the standard coercion
|
||||
function explicitly:
|
||||
|
||||
<blockquote><pre>
|
||||
// this is not necessary if automatic operator wrapping is used
|
||||
bignum_class.def_standard_coerce();
|
||||
</pre></blockquote>
|
||||
|
||||
If you encounter a situation where you absolutely need a customized
|
||||
coercion, you can still define the "__coerce__" operator manually. The signature
|
||||
of a coercion function should look like one of the following (the first is
|
||||
the safest):
|
||||
|
||||
<blockquote><pre>
|
||||
boost::python::tuple custom_coerce(boost::python::reference left, boost::python::reference right);
|
||||
boost::python::tuple custom_coerce(PyObject* left, PyObject* right);
|
||||
PyObject* custom_coerce(PyObject* left, PyObject* right);
|
||||
</pre></blockquote>
|
||||
|
||||
The resulting <code>tuple</code> must contain two elements which
|
||||
represent the values of <code>left</code> and <code>right</code>
|
||||
converted to the same type. Such a function is wrapped as usual:
|
||||
|
||||
<blockquote><pre>
|
||||
// this must be called before any use of automatic operator
|
||||
// wrapping or a call to some_class.def_standard_coerce()
|
||||
some_class.def(&custom_coerce, "__coerce__");
|
||||
</pre></blockquote>
|
||||
|
||||
Note that the standard coercion (defined by use of automatic
|
||||
operator wrapping on a <code>class_builder</code> or a call to
|
||||
<code>class_builder::def_standard_coerce()</code>) will never be applied if
|
||||
a custom coercion function has been registered. Therefore, in
|
||||
your coercion function you should call
|
||||
|
||||
<blockquote><pre>
|
||||
boost::python::standard_coerce(left, right);
|
||||
</pre></blockquote>
|
||||
|
||||
for all cases that you don't want to handle yourself.
|
||||
|
||||
<h3><a name="ternary_pow">The Ternary <code>pow()</code> Operator</a></h3>
|
||||
|
||||
<p>
|
||||
In addition to the usual binary <code>pow(x, y)</code> operator (meaning
|
||||
<i>x<sup>y</sup></i>), Python also provides a ternary variant that implements
|
||||
<i>x<sup>y</sup> <b>mod</b> z</i>, presumably using a more efficient algorithm than
|
||||
concatenation of power and modulo operators. Automatic operator wrapping
|
||||
can only be used with the binary variant. Ternary <code>pow()</code> must
|
||||
always be wrapped manually. For a homgeneous ternary <code>pow()</code>,
|
||||
this is done as usual:
|
||||
|
||||
<blockquote><pre>
|
||||
BigNum power(BigNum const& first, BigNum const& second, BigNum const& modulus);
|
||||
typedef BigNum (ternary_function1)(const BigNum&, const BigNum&, const BigNum&);
|
||||
...
|
||||
bignum_class.def((ternary_function1)&power, "__pow__");
|
||||
</pre></blockquote>
|
||||
|
||||
If you want to support this function with non-uniform argument
|
||||
types, wrapping is a little more involved. Suppose you have to wrap:
|
||||
|
||||
<blockquote><pre>
|
||||
BigNum power(BigNum const& first, int second, int modulus);
|
||||
BigNum power(int first, BigNum const& second, int modulus);
|
||||
BigNum power(int first, int second, BigNum const& modulus);
|
||||
</pre></blockquote>
|
||||
|
||||
The first variant can be wrapped as usual:
|
||||
|
||||
<blockquote><pre>
|
||||
typedef BigNum (ternary_function2)(const BigNum&, int, int);
|
||||
bignum_class.def((ternary_function2)&power, "__pow__");
|
||||
</pre></blockquote>
|
||||
|
||||
In the second variant, however, <code>BigNum</code> appears only as second
|
||||
argument, and in the last one it's the third argument. These functions
|
||||
must be presented to Boost.Python such that that the <code>BigNum</code>
|
||||
argument appears in first position:
|
||||
|
||||
<blockquote><pre>
|
||||
BigNum rpower(BigNum const& second, int first, int modulus)
|
||||
{
|
||||
return power(first, second, modulus);
|
||||
}
|
||||
|
||||
BigNum rrpower(BigNum const& modulus, int first, int second)
|
||||
{
|
||||
return power(first, second, modulus);
|
||||
}
|
||||
</pre></blockquote>
|
||||
|
||||
<p>These functions must be wrapped under the names "__rpow__" and "__rrpow__"
|
||||
respectively:
|
||||
|
||||
<blockquote><pre>
|
||||
bignum_class.def((ternary_function2)&rpower, "__rpow__");
|
||||
bignum_class.def((ternary_function2)&rrpower, "__rrpow__");
|
||||
</pre></blockquote>
|
||||
|
||||
Note that "__rrpow__" is an extension not present in plain Python.
|
||||
|
||||
<h2><a name="numeric_table">Table of Automatically Wrapped Methods</a></h2>
|
||||
<p>
|
||||
Boost.Python can automatically wrap the following <a href=
|
||||
"http://www.python.org/doc/current/ref/specialnames.html">
|
||||
special methods</a>:
|
||||
|
||||
<p>
|
||||
<table summary="special numeric methods" cellpadding="5" border="1"
|
||||
width="100%">
|
||||
<tr>
|
||||
<td align="center">
|
||||
<b>Python Operator Name</b>
|
||||
<td align="center">
|
||||
<b>Python Expression</b>
|
||||
<td align="center">
|
||||
<b>C++ Operator Id</b>
|
||||
<td align="center">
|
||||
<b>C++ Expression Used For Automatic Wrapping</b><br>
|
||||
with <code>cpp_left = from_python(left,
|
||||
type<Left>())</code>,<br>
|
||||
<code>cpp_right = from_python(right,
|
||||
type<Right>())</code>,<br>
|
||||
and <code>cpp_oper = from_python(oper, type<Oper>())</code>
|
||||
<tr>
|
||||
<td>
|
||||
<code>__add__, __radd__</code>
|
||||
<td>
|
||||
<code>left + right</code>
|
||||
<td>
|
||||
<code>op_add</code>
|
||||
<td>
|
||||
<code>cpp_left + cpp_right</code>
|
||||
<tr>
|
||||
<td>
|
||||
<code>__sub__, __rsub__</code>
|
||||
<td>
|
||||
<code>left - right</code>
|
||||
<td>
|
||||
<code>op_sub</code>
|
||||
<td>
|
||||
<code>cpp_left - cpp_right</code>
|
||||
<tr>
|
||||
<td>
|
||||
<code>__mul__, __rmul__</code>
|
||||
<td>
|
||||
<code>left * right</code>
|
||||
<td>
|
||||
<code>op_mul</code>
|
||||
<td>
|
||||
<code>cpp_left * cpp_right</code>
|
||||
<tr>
|
||||
<td>
|
||||
<code>__div__, __rdiv__</code>
|
||||
<td>
|
||||
<code>left / right</code>
|
||||
<td>
|
||||
<code>op_div</code>
|
||||
<td>
|
||||
<code>cpp_left / cpp_right</code>
|
||||
<tr>
|
||||
<td>
|
||||
<code>__mod__, __rmod__</code>
|
||||
<td>
|
||||
<code>left % right</code>
|
||||
<td>
|
||||
<code>op_mod</code>
|
||||
<td>
|
||||
<code>cpp_left % cpp_right</code>
|
||||
<tr>
|
||||
<td>
|
||||
<code>__divmod__, __rdivmod__</code>
|
||||
<td>
|
||||
<code>(quotient, remainder)<br>
|
||||
= divmod(left, right)</code>
|
||||
<td>
|
||||
<code>op_divmod</code>
|
||||
<td>
|
||||
<code>cpp_left / cpp_right</code>
|
||||
<br><code>cpp_left % cpp_right</code>
|
||||
<tr>
|
||||
<td>
|
||||
<code>__pow__, __rpow__</code>
|
||||
<td>
|
||||
<code>pow(left, right)</code><br>
|
||||
(binary power)
|
||||
<td>
|
||||
<code>op_pow</code>
|
||||
<td>
|
||||
<code>pow(cpp_left, cpp_right)</code>
|
||||
<tr>
|
||||
<td>
|
||||
<code>__rrpow__</code>
|
||||
<td>
|
||||
<code>pow(left, right, modulo)</code><br>
|
||||
(ternary power modulo)
|
||||
<td colspan="2">
|
||||
no automatic wrapping, <a href="#ternary_pow">special treatment</a>
|
||||
required
|
||||
<tr>
|
||||
<td>
|
||||
<code>__lshift__, __rlshift__</code>
|
||||
<td>
|
||||
<code>left << right</code>
|
||||
<td>
|
||||
<code>op_lshift</code>
|
||||
<td>
|
||||
<code>cpp_left << cpp_right</code>
|
||||
<tr>
|
||||
<td>
|
||||
<code>__rshift__, __rrshift__</code>
|
||||
<td>
|
||||
<code>left >> right</code>
|
||||
<td>
|
||||
<code>op_rshift</code>
|
||||
<td>
|
||||
<code>cpp_left >> cpp_right</code>
|
||||
<tr>
|
||||
<td>
|
||||
<code>__and__, __rand__</code>
|
||||
<td>
|
||||
<code>left & right</code>
|
||||
<td>
|
||||
<code>op_and</code>
|
||||
<td>
|
||||
<code>cpp_left & cpp_right</code>
|
||||
<tr>
|
||||
<td>
|
||||
<code>__xor__, __rxor__</code>
|
||||
<td>
|
||||
<code>left ^ right</code>
|
||||
<td>
|
||||
<code>op_xor</code>
|
||||
<td>
|
||||
<code>cpp_left ^ cpp_right</code>
|
||||
<tr>
|
||||
<td>
|
||||
<code>__or__, __ror__</code>
|
||||
<td>
|
||||
<code>left | right</code>
|
||||
<td>
|
||||
<code>op_or</code>
|
||||
<td>
|
||||
<code>cpp_left | cpp_right</code>
|
||||
|
||||
<tr>
|
||||
<td>
|
||||
<code>__cmp__, __rcmp__</code>
|
||||
<td>
|
||||
<code>cmp(left, right)</code><br>
|
||||
<br>See <a href="richcmp.html">Rich Comparisons</a>.
|
||||
<td>
|
||||
<code>op_cmp</code>
|
||||
<td>
|
||||
<code>cpp_left < cpp_right </code>
|
||||
<br><code>cpp_right < cpp_left</code>
|
||||
<tr>
|
||||
<td>
|
||||
<code>__lt__</code>
|
||||
<br><code>__le__</code>
|
||||
<br><code>__eq__</code>
|
||||
<br><code>__ne__</code>
|
||||
<br><code>__gt__</code>
|
||||
<br><code>__ge__</code>
|
||||
<td>
|
||||
<code>left < right</code>
|
||||
<br><code>left <= right</code>
|
||||
<br><code>left == right</code>
|
||||
<br><code>left != right</code>
|
||||
<br><code>left > right</code>
|
||||
<br><code>left >= right</code>
|
||||
<br>See <a href="richcmp.html">Rich Comparisons</a>
|
||||
<td>
|
||||
<code>op_lt</code>
|
||||
<br><code>op_le</code>
|
||||
<br><code>op_eq</code>
|
||||
<br><code>op_ne</code>
|
||||
<br><code>op_gt</code>
|
||||
<br><code>op_ge</code>
|
||||
<td>
|
||||
<code>cpp_left < cpp_right </code>
|
||||
<br><code>cpp_left <= cpp_right </code>
|
||||
<br><code>cpp_left == cpp_right </code>
|
||||
<br><code>cpp_left != cpp_right </code>
|
||||
<br><code>cpp_left > cpp_right </code>
|
||||
<br><code>cpp_left >= cpp_right </code>
|
||||
|
||||
<tr>
|
||||
<td>
|
||||
<code>__neg__</code>
|
||||
<td>
|
||||
<code>-oper </code> (unary negation)
|
||||
<td>
|
||||
<code>op_neg</code>
|
||||
<td>
|
||||
<code>-cpp_oper</code>
|
||||
<tr>
|
||||
<td>
|
||||
<code>__pos__</code>
|
||||
<td>
|
||||
<code>+oper </code> (identity)
|
||||
<td>
|
||||
<code>op_pos</code>
|
||||
<td>
|
||||
<code>+cpp_oper</code>
|
||||
<tr>
|
||||
<td>
|
||||
<code>__abs__</code>
|
||||
<td>
|
||||
<code>abs(oper) </code> (absolute value)
|
||||
<td>
|
||||
<code>op_abs</code>
|
||||
<td>
|
||||
<code>abs(cpp_oper)</code>
|
||||
<tr>
|
||||
<td>
|
||||
<code>__invert__</code>
|
||||
<td>
|
||||
<code>~oper </code> (bitwise inversion)
|
||||
<td>
|
||||
<code>op_invert</code>
|
||||
<td>
|
||||
<code>~cpp_oper</code>
|
||||
<tr>
|
||||
<td>
|
||||
<code>__int__</code>
|
||||
<td>
|
||||
<code>int(oper) </code> (integer conversion)
|
||||
<td>
|
||||
<code>op_int</code>
|
||||
<td>
|
||||
<code>long(cpp_oper)</code>
|
||||
<tr>
|
||||
<td>
|
||||
<code>__long__</code>
|
||||
<td>
|
||||
<code>long(oper) </code><br>
|
||||
(infinite precision integer conversion)
|
||||
<td>
|
||||
<code>op_long</code>
|
||||
<td>
|
||||
<code>PyLong_FromLong(cpp_oper)</code>
|
||||
<tr>
|
||||
<td>
|
||||
<code>__float__</code>
|
||||
<td>
|
||||
<code>float(oper) </code> (float conversion)
|
||||
<td>
|
||||
<code>op_float</code>
|
||||
<td>
|
||||
<code>double(cpp_oper)</code>
|
||||
<tr>
|
||||
<td>
|
||||
<code>__str__</code>
|
||||
<td>
|
||||
<code>str(oper) </code> (string conversion)
|
||||
<td>
|
||||
<code>op_str</code>
|
||||
<td>
|
||||
<code>std::ostringstream s; s << oper;</code>
|
||||
<tr>
|
||||
<td>
|
||||
<code>__coerce__</code>
|
||||
<td>
|
||||
<code>coerce(left, right)</code>
|
||||
<td colspan="2">
|
||||
usually defined automatically, otherwise <a href="#coercion">
|
||||
special treatment</a> required
|
||||
</table>
|
||||
|
||||
<h2><a name="sequence_and_mapping">Sequence and Mapping Operators</a></h2>
|
||||
|
||||
<p>
|
||||
Sequence and mapping operators let wrapped objects behave in accordance
|
||||
to Python's iteration and access protocols. These protocols differ
|
||||
considerably from the ones found in C++. For example, Python's typical
|
||||
iteration idiom looks like
|
||||
|
||||
<blockquote><pre>
|
||||
for i in S:
|
||||
</pre></blockquote>
|
||||
|
||||
while in C++ one writes
|
||||
|
||||
<blockquote><pre>
|
||||
for (iterator i = S.begin(), end = S.end(); i != end; ++i)
|
||||
</pre></blockquote>
|
||||
|
||||
<p>One could try to wrap C++ iterators in order to carry the C++ idiom into
|
||||
Python. However, this does not work very well because
|
||||
|
||||
<ol>
|
||||
<li>It leads to
|
||||
non-uniform Python code (wrapped sequences support a usage different from
|
||||
Python built-in sequences) and
|
||||
|
||||
<li>Iterators (e.g. <code>std::vector::iterator</code>) are often implemented as plain C++
|
||||
pointers which are <a href="pointers.html#problem">problematic</a> for any automatic
|
||||
wrapping system.
|
||||
</ol>
|
||||
|
||||
<p>
|
||||
It is a better idea to support the standard <a
|
||||
href="http://www.python.org/doc/current/ref/sequence-types.html">Python
|
||||
sequence and mapping protocols</a> for your wrapped containers. These
|
||||
operators have to be wrapped manually because there are no corresponding
|
||||
C++ operators that could be used for automatic wrapping. The Python
|
||||
documentation lists the relevant <a href=
|
||||
"http://www.python.org/doc/current/ref/sequence-types.html">
|
||||
container operators</a>. In particular, expose __getitem__, __setitem__
|
||||
and remember to raise the appropriate Python exceptions
|
||||
(<code>PyExc_IndexError</code> for sequences,
|
||||
<code>PyExc_KeyError</code> for mappings) when the requested item is not
|
||||
present.
|
||||
|
||||
<p>
|
||||
In the following example, we expose <code>std::map<std::size_t,std::string></code>:
|
||||
<blockquote>
|
||||
<pre>
|
||||
typedef std::map<std::size_t, std::string> StringMap;
|
||||
|
||||
// A helper function for dealing with errors. Throw a Python exception
|
||||
// if p == m.end().
|
||||
void throw_key_error_if_end(
|
||||
const StringMap& m,
|
||||
StringMap::const_iterator p,
|
||||
std::size_t key)
|
||||
{
|
||||
if (p == m.end())
|
||||
{
|
||||
PyErr_SetObject(PyExc_KeyError, boost::python::converters::to_python(key));
|
||||
boost::python::throw_error_already_set();
|
||||
}
|
||||
}
|
||||
|
||||
// Define some simple wrapper functions which match the Python protocol
|
||||
// for __getitem__, __setitem__, and __delitem__. Just as in Python, a
|
||||
// free function with a ``self'' first parameter makes a fine class method.
|
||||
|
||||
const std::string& get_item(const StringMap& self, std::size_t key)
|
||||
{
|
||||
const StringMap::const_iterator p = self.find(key);
|
||||
throw_key_error_if_end(self, p, key);
|
||||
return p->second;
|
||||
}
|
||||
|
||||
// Sets the item corresponding to key in the map.
|
||||
void StringMapPythonClass::set_item(StringMap& self, std::size_t key, const std::string& value)
|
||||
{
|
||||
self[key] = value;
|
||||
}
|
||||
|
||||
// Deletes the item corresponding to key from the map.
|
||||
void StringMapPythonClass::del_item(StringMap& self, std::size_t key)
|
||||
{
|
||||
const StringMap::iterator p = self.find(key);
|
||||
throw_key_error_if_end(self, p, key);
|
||||
self.erase(p);
|
||||
}
|
||||
|
||||
class_builder<StringMap> string_map(my_module, "StringMap");
|
||||
string_map.def(boost::python::constructor<>());
|
||||
string_map.def(&StringMap::size, "__len__");
|
||||
string_map.def(get_item, "__getitem__");
|
||||
string_map.def(set_item, "__setitem__");
|
||||
string_map.def(del_item, "__delitem__");
|
||||
</pre>
|
||||
</blockquote>
|
||||
<p>
|
||||
Then in Python:
|
||||
<blockquote>
|
||||
<pre>
|
||||
>>> m = StringMap()
|
||||
>>> m[1]
|
||||
Traceback (innermost last):
|
||||
File "<stdin>", line 1, in ?
|
||||
KeyError: 1
|
||||
>>> m[1] = 'hello'
|
||||
>>> m[1]
|
||||
'hello'
|
||||
>>> del m[1]
|
||||
>>> m[1] # prove that it's gone
|
||||
Traceback (innermost last):
|
||||
File "<stdin>", line 1, in ?
|
||||
KeyError: 1
|
||||
>>> del m[2]
|
||||
Traceback (innermost last):
|
||||
File "<stdin>", line 1, in ?
|
||||
KeyError: 2
|
||||
>>> len(m)
|
||||
0
|
||||
>>> m[0] = 'zero'
|
||||
>>> m[1] = 'one'
|
||||
>>> m[2] = 'two'
|
||||
>>> m[3] = 'three'
|
||||
>>> len(m)
|
||||
4
|
||||
</pre>
|
||||
</blockquote>
|
||||
|
||||
<h2><a name="getter_setter">Customized Attribute Access</a></h2>
|
||||
|
||||
<p>
|
||||
Just like built-in Python classes, Boost.Python extension classes support <a
|
||||
href="http://www.python.org/doc/current/ref/attribute-access.html">special
|
||||
the usual attribute access methods</a> <code>__getattr__</code>,
|
||||
<code>__setattr__</code>, and <code>__delattr__</code>.
|
||||
Because writing these functions can
|
||||
be tedious in the common case where the attributes being accessed are
|
||||
known statically, Boost.Python checks the special names
|
||||
|
||||
<ul>
|
||||
<li>
|
||||
<code>__getattr__<em><name></em>__</code>
|
||||
<li>
|
||||
<code>__setattr__<em><name></em>__</code>
|
||||
<li>
|
||||
<code>__delattr__<em><name></em>__</code>
|
||||
</ul>
|
||||
|
||||
to provide functional access to the attribute <em><name></em>. This
|
||||
facility can be used from C++ or entirely from Python. For example, the
|
||||
following shows how we can implement a ``computed attribute'' in Python:
|
||||
<blockquote>
|
||||
<pre>
|
||||
>>> class Range(AnyBoost.PythonExtensionClass):
|
||||
... def __init__(self, start, end):
|
||||
... self.start = start
|
||||
... self.end = end
|
||||
... def __getattr__length__(self):
|
||||
... return self.end - self.start
|
||||
...
|
||||
>>> x = Range(3, 9)
|
||||
>>> x.length
|
||||
6
|
||||
</pre>
|
||||
</blockquote>
|
||||
<h4>
|
||||
Direct Access to Data Members
|
||||
</h4>
|
||||
<p>
|
||||
Boost.Python uses the special <code>
|
||||
__xxxattr__<em><name></em>__</code> functionality described above
|
||||
to allow direct access to data members through the following special
|
||||
functions on <code>class_builder<></code> and <code>
|
||||
extension_class<></code>:
|
||||
<ul>
|
||||
<li>
|
||||
<code>def_getter(<em>pointer-to-member</em>, <em>name</em>)</code> //
|
||||
read access to the member via attribute <em>name</em>
|
||||
<li>
|
||||
<code>def_setter(<em>pointer-to-member</em>, <em>name</em>)</code> //
|
||||
write access to the member via attribute <em>name</em>
|
||||
<li>
|
||||
<code>def_readonly(<em>pointer-to-member</em>, <em>name</em>)</code>
|
||||
// read-only access to the member via attribute <em>name</em>
|
||||
<li>
|
||||
<code>def_read_write(<em>pointer-to-member</em>, <em>
|
||||
name</em>)</code> // read/write access to the member via attribute
|
||||
<em>name</em>
|
||||
</ul>
|
||||
<p>
|
||||
Note that the first two functions, used alone, may produce surprising
|
||||
behavior. For example, when <code>def_getter()</code> is used, the
|
||||
default functionality for <code>setattr()</code> and <code>
|
||||
delattr()</code> remains in effect, operating on items in the extension
|
||||
instance's name-space (i.e., its <code>__dict__</code>). For that
|
||||
reason, you'll usually want to stick with <code>def_readonly</code> and
|
||||
<code>def_read_write</code>.
|
||||
<p>
|
||||
For example, to expose a <code>std::pair<int,long></code> we
|
||||
might write:
|
||||
<blockquote>
|
||||
<pre>
|
||||
typedef std::pair<int,long> Pil;
|
||||
int first(const Pil& x) { return x.first; }
|
||||
long second(const Pil& x) { return x.second; }
|
||||
...
|
||||
my_module.def(first, "first");
|
||||
my_module.def(second, "second");
|
||||
|
||||
class_builder<Pil> pair_int_long(my_module, "Pair");
|
||||
pair_int_long.def(boost::python::constructor<>());
|
||||
pair_int_long.def(boost::python::constructor<int,long>());
|
||||
pair_int_long.def_read_write(&Pil::first, "first");
|
||||
pair_int_long.def_read_write(&Pil::second, "second");
|
||||
</pre>
|
||||
</blockquote>
|
||||
<p>
|
||||
Now your Python class has attributes <code>first</code> and <code>
|
||||
second</code> which, when accessed, actually modify or reflect the
|
||||
values of corresponding data members of the underlying C++ object. Now
|
||||
in Python:
|
||||
<blockquote>
|
||||
<pre>
|
||||
>>> x = Pair(3,5)
|
||||
>>> x.first
|
||||
3
|
||||
>>> x.second
|
||||
5
|
||||
>>> x.second = 8
|
||||
>>> x.second
|
||||
8
|
||||
>>> second(x) # Prove that we're not just changing the instance __dict__
|
||||
8
|
||||
</pre>
|
||||
</blockquote>
|
||||
<h2>
|
||||
<a name="reasons">And what about <code>__complex__</code>?</a>
|
||||
</h2>
|
||||
<p>
|
||||
That, dear reader, is one problem we don't know how to solve. The
|
||||
Python source contains the following fragment, indicating the
|
||||
special-case code really is hardwired:
|
||||
<blockquote>
|
||||
<pre>
|
||||
/* XXX Hack to support classes with __complex__ method */
|
||||
if (PyInstance_Check(r)) { ...
|
||||
</pre>
|
||||
</blockquote>
|
||||
<p>
|
||||
Next: <a href="under-the-hood.html">A Peek Under the Hood</a>
|
||||
Previous: <a href="inheritance.html">Inheritance</a>
|
||||
Up: <a href= "index.html">Top</a>
|
||||
<p>
|
||||
© Copyright David Abrahams and Ullrich Köthe 2000.
|
||||
Permission to copy, use, modify, sell and distribute this document is
|
||||
granted provided this copyright notice appears in all copies. This
|
||||
document is provided ``as is'' without express or implied
|
||||
warranty, and with no claim as to its suitability for any purpose.
|
||||
<p>
|
||||
Updated: Nov 26, 2000
|
||||
</div>
|
||||
|
||||
71
doc/support.html
Normal file
@@ -0,0 +1,71 @@
|
||||
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
|
||||
|
||||
<html>
|
||||
<head>
|
||||
<meta name="generator" content=
|
||||
"HTML Tidy for Cygwin (vers 1st April 2002), see www.w3.org">
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<link rel="stylesheet" type="text/css" href="boost.css">
|
||||
|
||||
<title>Boost.Python - Support Resources</title>
|
||||
</head>
|
||||
|
||||
<body link="#0000ff" vlink="#800080">
|
||||
<table border="0" cellpadding="7" cellspacing="0" width="100%" summary=
|
||||
"header">
|
||||
<tr>
|
||||
<td valign="top" width="300">
|
||||
<h3><a href="../../../index.htm"><img height="86" width="277" alt=
|
||||
"C++ Boost" src="../../../boost.png" border="0"></a></h3>
|
||||
</td>
|
||||
|
||||
<td valign="top">
|
||||
<h1 align="center"><a href="index.html">Boost.Python</a></h1>
|
||||
|
||||
<h2 align="center">Support Resources</h2>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
<hr>
|
||||
|
||||
<h2>Synopsis</h2>
|
||||
|
||||
<p>This is a list of available resources for support with Boost.Python
|
||||
problems and feature requests. <b>Please try to resist emailing the
|
||||
Boost.Python developers directly for support.</b> Use the following
|
||||
resources instead; the developers are listening!</p>
|
||||
<hr>
|
||||
|
||||
<dl class="page-index">
|
||||
<dt><b><a href="http://www.boost-consulting.com">Boost
|
||||
Consulting</a></b> - Commercial support, development, training, and
|
||||
distribution for all the Boost libraries, from the people who brought
|
||||
you Boost.Python.<br>
|
||||
</dt>
|
||||
|
||||
<dt><b><a href=
|
||||
"http://www.boost.org/more/mailing_lists.htm#cplussig">The Python
|
||||
C++-sig</a></b> mailing list is a forum for discussing Python/C++
|
||||
interoperability, and Boost.Python in particular. Post your
|
||||
Boost.Python questions here.<br>
|
||||
</dt>
|
||||
|
||||
<dt>The <b>Boost.Python <a href=
|
||||
"http://www.python.org/cgi-bin/moinmoin/boost_2epython">Wiki
|
||||
Pages</a></b> established by Mike Rovner as part of the <a href=
|
||||
"http://www.python.org/cgi-bin/moinmoin">PythonInfo Wiki</a> serves as
|
||||
a forum to gather peoples' experience and as a cookbook.<br>
|
||||
</dt>
|
||||
</dl>
|
||||
<hr>
|
||||
|
||||
<p>Revised
|
||||
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
|
||||
12 Sept, 2003 <!--webbot bot="Timestamp" endspan i-checksum="39359" -->
|
||||
</p>
|
||||
|
||||
<p><i>© Copyright <a href="../../../people/dave_abrahams.htm">Dave
|
||||
Abrahams</a> 2003.</i></p>
|
||||
</body>
|
||||
</html>
|
||||
|
||||
8
doc/tutorial/doc/Jamfile.v2
Normal file
@@ -0,0 +1,8 @@
|
||||
project boost/libs/python/doc/tutorial/doc ;
|
||||
import boostbook : boostbook ;
|
||||
|
||||
boostbook tutorial : tutorial.xml
|
||||
: <xsl:param>boost.root=../../../../../..
|
||||
<xsl:param>boost.libraries=../../../../../libraries.htm
|
||||
;
|
||||
|
||||
9
doc/tutorial/doc/html/HTML.manifest
Normal file
@@ -0,0 +1,9 @@
|
||||
index.html
|
||||
python/hello.html
|
||||
python/exposing.html
|
||||
python/functions.html
|
||||
python/object.html
|
||||
python/embedding.html
|
||||
python/iterators.html
|
||||
python/exception.html
|
||||
python/techniques.html
|
||||
295
doc/tutorial/doc/html/boostbook.css
Normal file
@@ -0,0 +1,295 @@
|
||||
/*=============================================================================
|
||||
Copyright (c) 2002 2004 Joel de Guzman
|
||||
http://spirit.sourceforge.net/
|
||||
|
||||
Use, modification and distribution is subject to the Boost Software
|
||||
License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
|
||||
http://www.boost.org/LICENSE_1_0.txt)
|
||||
=============================================================================*/
|
||||
|
||||
/* CSS based on w3c documentation which I like a lot, and the classic Spirit
|
||||
documentation. */
|
||||
|
||||
/* Body defaults */
|
||||
body
|
||||
{
|
||||
padding: 2em 1em 2em 1em;
|
||||
margin: 1em 1em 1em 1em;
|
||||
font-family: sans-serif;
|
||||
}
|
||||
|
||||
/* Paragraphs */
|
||||
p
|
||||
{
|
||||
text-align: justify;
|
||||
}
|
||||
|
||||
pre.synopsis
|
||||
{
|
||||
margin: 1pc 4% 0pc 4%;
|
||||
padding: 0.5pc 0.5pc 0.5pc 0.5pc;
|
||||
}
|
||||
|
||||
/* Headings */
|
||||
h1, h2, h3, h4, h5, h6 { text-align: left; margin-top: 2pc; }
|
||||
h1 { font: 170% sans-serif }
|
||||
h2 { font: bold 140% sans-serif }
|
||||
h3 { font: 120% sans-serif }
|
||||
h4 { font: bold 100% sans-serif }
|
||||
h5 { font: italic 100% sans-serif }
|
||||
h6 { font: italic 100% sans-serif }
|
||||
|
||||
/* Unordered lists */
|
||||
ul
|
||||
{
|
||||
text-align: justify;
|
||||
}
|
||||
|
||||
/* Links */
|
||||
a
|
||||
{
|
||||
text-decoration: none; /* no underline */
|
||||
}
|
||||
|
||||
a:hover
|
||||
{
|
||||
text-decoration: underline;
|
||||
}
|
||||
|
||||
/* Top page title */
|
||||
title, h1.title, h2.title, h3.title,
|
||||
h4.title, h5.title, h6.title,
|
||||
.refentrytitle
|
||||
{
|
||||
font-weight: bold;
|
||||
font-size: 2pc;
|
||||
margin-bottom: 1pc;
|
||||
}
|
||||
|
||||
/* Spirit style navigation */
|
||||
.spirit-nav
|
||||
{
|
||||
text-align: right;
|
||||
}
|
||||
|
||||
.spirit-nav a
|
||||
{
|
||||
color: white;
|
||||
padding-left: 0.5em;
|
||||
}
|
||||
|
||||
.spirit-nav img
|
||||
{
|
||||
border-width: 0px;
|
||||
}
|
||||
|
||||
/* Program listing box */
|
||||
.programlisting, .screen
|
||||
{
|
||||
display: block;
|
||||
margin-left: 4%;
|
||||
margin-right: 4%;
|
||||
padding: 0.5pc 0.5pc 0.5pc 0.5pc;
|
||||
}
|
||||
|
||||
/* Table of contents */
|
||||
.toc
|
||||
{
|
||||
margin: 1pc 4% 0pc 4%;
|
||||
padding: 0.5pc 0.5pc 0.5pc 0.5pc;
|
||||
}
|
||||
|
||||
.boost-toc
|
||||
{
|
||||
float: right;
|
||||
padding: 0.5pc;
|
||||
}
|
||||
|
||||
/* Tables */
|
||||
.table-title, div.table p.title
|
||||
{
|
||||
margin-left: 4%;
|
||||
padding-right: 0.5em;
|
||||
padding-left: 0.5em;
|
||||
font-size: 120%;
|
||||
}
|
||||
|
||||
.informaltable table, .table table
|
||||
{
|
||||
width: 92%;
|
||||
margin-left: 4%;
|
||||
margin-right: 4%;
|
||||
}
|
||||
|
||||
div.informaltable table, div.table table
|
||||
{
|
||||
padding: 4px 4px 4px 4px;
|
||||
}
|
||||
|
||||
div.informaltable table tr td, div.table table tr td
|
||||
{
|
||||
padding: 0.5em 0.5em 0.5em 0.5em;
|
||||
text-align: justify;
|
||||
}
|
||||
|
||||
div.informaltable table tr th, div.table table tr th
|
||||
{
|
||||
padding: 0.5em 0.5em 0.5em 0.5em;
|
||||
border: 1pt solid white;
|
||||
}
|
||||
|
||||
/* inlined images */
|
||||
.inlinemediaobject
|
||||
{
|
||||
padding: 0.5em 0.5em 0.5em 0.5em;
|
||||
}
|
||||
|
||||
/* tone down the title of Parameter lists */
|
||||
div.variablelist p.title
|
||||
{
|
||||
font-weight: bold;
|
||||
font-size: 100%;
|
||||
text-align: left;
|
||||
}
|
||||
|
||||
/* tabularize parameter lists */
|
||||
div.variablelist dl dt
|
||||
{
|
||||
float: left;
|
||||
clear: left;
|
||||
display: block;
|
||||
font-style: italic;
|
||||
}
|
||||
|
||||
div.variablelist dl dd
|
||||
{
|
||||
display: block;
|
||||
clear: right;
|
||||
padding-left: 8pc;
|
||||
}
|
||||
|
||||
/* title of books and articles in bibliographies */
|
||||
span.title
|
||||
{
|
||||
font-style: italic;
|
||||
}
|
||||
|
||||
|
||||
@media screen
|
||||
{
|
||||
a
|
||||
{
|
||||
color: #005a9c;
|
||||
}
|
||||
|
||||
a:visited
|
||||
{
|
||||
color: #9c5a9c;
|
||||
}
|
||||
|
||||
/* Syntax Highlighting */
|
||||
.keyword { color: #0000AA; font-weight: bold; }
|
||||
.identifier {}
|
||||
.special { color: #707070; }
|
||||
.preprocessor { color: #402080; font-weight: bold; }
|
||||
.char { color: teal; }
|
||||
.comment { color: #800000; }
|
||||
.string { color: teal; }
|
||||
.number { color: teal; }
|
||||
.copyright { color: #666666; font-size: small; }
|
||||
.white_bkd { background-color: #FFFFFF; }
|
||||
.dk_grey_bkd { background-color: #999999; }
|
||||
|
||||
pre.synopsis
|
||||
{
|
||||
background-color: #f3f3f3;
|
||||
}
|
||||
|
||||
.programlisting, .screen
|
||||
{
|
||||
background-color: #f3f3f3;
|
||||
}
|
||||
|
||||
/* Table of contents */
|
||||
.toc
|
||||
{
|
||||
background-color: #f3f3f3;
|
||||
}
|
||||
|
||||
div.informaltable table tr td, div.table table tr td
|
||||
{
|
||||
background-color: #F3F3F3;
|
||||
border: 1pt solid white;
|
||||
}
|
||||
|
||||
div.informaltable table tr th, div.table table tr th
|
||||
{
|
||||
background-color: #e4e4e4;
|
||||
}
|
||||
|
||||
span.highlight
|
||||
{
|
||||
color: #00A000;
|
||||
}
|
||||
}
|
||||
|
||||
@media print
|
||||
{
|
||||
a
|
||||
{
|
||||
color: black;
|
||||
}
|
||||
|
||||
a:visited
|
||||
{
|
||||
color: black;
|
||||
}
|
||||
|
||||
.spirit-nav
|
||||
{
|
||||
display: none;
|
||||
}
|
||||
|
||||
/* Syntax Highlighting */
|
||||
.keyword
|
||||
{
|
||||
font-weight: bold;
|
||||
}
|
||||
|
||||
pre.synopsis
|
||||
{
|
||||
border: 1px solid gray;
|
||||
}
|
||||
|
||||
.programlisting, .screen
|
||||
{
|
||||
border: 1px solid gray;
|
||||
}
|
||||
|
||||
/* Table of contents */
|
||||
.toc
|
||||
{
|
||||
border: 1px solid gray;
|
||||
}
|
||||
|
||||
.informaltable table, .table table
|
||||
{
|
||||
border: 1px solid gray;
|
||||
border-collapse: collapse;
|
||||
}
|
||||
|
||||
div.informaltable table tr td, div.table table tr td
|
||||
{
|
||||
border: 1px solid gray;
|
||||
}
|
||||
|
||||
div.informaltable table tr th, div.table table tr th
|
||||
{
|
||||
border: 1px solid gray;
|
||||
}
|
||||
|
||||
span.highlight
|
||||
{
|
||||
font-weight: bold;
|
||||
}
|
||||
}
|
||||
BIN
doc/tutorial/doc/html/images/alert.png
Executable file
|
After Width: | Height: | Size: 603 B |
BIN
doc/tutorial/doc/html/images/home.png
Executable file
|
After Width: | Height: | Size: 358 B |
BIN
doc/tutorial/doc/html/images/jam.png
Normal file
|
After Width: | Height: | Size: 3.8 KiB |
BIN
doc/tutorial/doc/html/images/next.png
Executable file
|
After Width: | Height: | Size: 336 B |
BIN
doc/tutorial/doc/html/images/note.png
Executable file
|
After Width: | Height: | Size: 658 B |
BIN
doc/tutorial/doc/html/images/prev.png
Executable file
|
After Width: | Height: | Size: 334 B |
BIN
doc/tutorial/doc/html/images/python.png
Normal file
|
After Width: | Height: | Size: 14 KiB |
BIN
doc/tutorial/doc/html/images/smiley.png
Normal file
|
After Width: | Height: | Size: 867 B |
BIN
doc/tutorial/doc/html/images/tip.png
Executable file
|
After Width: | Height: | Size: 640 B |
BIN
doc/tutorial/doc/html/images/up.png
Executable file
|
After Width: | Height: | Size: 370 B |
132
doc/tutorial/doc/html/index.html
Normal file
@@ -0,0 +1,132 @@
|
||||
<html>
|
||||
<head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
|
||||
<title>Chapter 1. python 1.0</title>
|
||||
<link rel="stylesheet" href="boostbook.css" type="text/css">
|
||||
<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
|
||||
<link rel="start" href="index.html" title="Chapter 1. python 1.0">
|
||||
<link rel="next" href="python/hello.html" title=" Building Hello World">
|
||||
</head>
|
||||
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
|
||||
<table cellpadding="2" width="100%">
|
||||
<td valign="top"><img alt="boost.png (6897 bytes)" width="277" height="86" src="../../../../../../boost.png"></td>
|
||||
<td align="center"><a href="../../../../../../index.htm">Home</a></td>
|
||||
<td align="center"><a href="../../../../../libraries.htm">Libraries</a></td>
|
||||
<td align="center"><a href="../../../../../../people/people.htm">People</a></td>
|
||||
<td align="center"><a href="../../../../../../more/faq.htm">FAQ</a></td>
|
||||
<td align="center"><a href="../../../../../../more/index.htm">More</a></td>
|
||||
</table>
|
||||
<hr>
|
||||
<div class="spirit-nav"><a accesskey="n" href="python/hello.html"><img src="images/next.png" alt="Next"></a></div>
|
||||
<div class="chapter" lang="en">
|
||||
<div class="titlepage"><div>
|
||||
<div><h2 class="title">
|
||||
<a name="python"></a>Chapter 1. python 1.0</h2></div>
|
||||
<div><div class="author"><h3 class="author">
|
||||
<span class="firstname">Joel</span> <span class="surname">de Guzman</span>
|
||||
</h3></div></div>
|
||||
<div><div class="author"><h3 class="author">
|
||||
<span class="firstname">David</span> <span class="surname">Abrahams</span>
|
||||
</h3></div></div>
|
||||
<div><p class="copyright">Copyright © 2002-2004 Joel de Guzman, David Abrahams</p></div>
|
||||
<div><div class="legalnotice">
|
||||
<a name="id376569"></a><p>
|
||||
Distributed under the Boost Software License, Version 1.0.
|
||||
(See accompanying file LICENSE_1_0.txt or copy at
|
||||
<a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">
|
||||
http://www.boost.org/LICENSE_1_0.txt
|
||||
</a>)
|
||||
|
||||
</p>
|
||||
</div></div>
|
||||
</div></div>
|
||||
<div class="toc">
|
||||
<p><b>Table of Contents</b></p>
|
||||
<dl>
|
||||
<dt><span class="section"><a href="index.html#python.quickstart">QuickStart</a></span></dt>
|
||||
<dt><span class="section"><a href="python/hello.html"> Building Hello World</a></span></dt>
|
||||
<dt><span class="section"><a href="python/exposing.html"> Exposing Classes</a></span></dt>
|
||||
<dd><dl>
|
||||
<dt><span class="section"><a href="python/exposing.html#python.constructors">Constructors</a></span></dt>
|
||||
<dt><span class="section"><a href="python/exposing.html#python.class_data_members">Class Data Members</a></span></dt>
|
||||
<dt><span class="section"><a href="python/exposing.html#python.class_properties">Class Properties</a></span></dt>
|
||||
<dt><span class="section"><a href="python/exposing.html#python.inheritance">Inheritance</a></span></dt>
|
||||
<dt><span class="section"><a href="python/exposing.html#python.class_virtual_functions">Class Virtual Functions</a></span></dt>
|
||||
<dt><span class="section"><a href="python/exposing.html#python.virtual_functions_with_default_implementations">Virtual Functions with Default Implementations</a></span></dt>
|
||||
<dt><span class="section"><a href="python/exposing.html#python.class_operators_special_functions">Class Operators/Special Functions</a></span></dt>
|
||||
</dl></dd>
|
||||
<dt><span class="section"><a href="python/functions.html">Functions</a></span></dt>
|
||||
<dd><dl>
|
||||
<dt><span class="section"><a href="python/functions.html#python.call_policies">Call Policies</a></span></dt>
|
||||
<dt><span class="section"><a href="python/functions.html#python.overloading">Overloading</a></span></dt>
|
||||
<dt><span class="section"><a href="python/functions.html#python.default_arguments">Default Arguments</a></span></dt>
|
||||
<dt><span class="section"><a href="python/functions.html#python.auto_overloading">Auto-Overloading</a></span></dt>
|
||||
</dl></dd>
|
||||
<dt><span class="section"><a href="python/object.html"> Object Interface</a></span></dt>
|
||||
<dd><dl>
|
||||
<dt><span class="section"><a href="python/object.html#python.basic_interface">Basic Interface</a></span></dt>
|
||||
<dt><span class="section"><a href="python/object.html#python.derived_object_types">Derived Object types</a></span></dt>
|
||||
<dt><span class="section"><a href="python/object.html#python.extracting_c___objects">Extracting C++ objects</a></span></dt>
|
||||
<dt><span class="section"><a href="python/object.html#python.enums">Enums</a></span></dt>
|
||||
</dl></dd>
|
||||
<dt><span class="section"><a href="python/embedding.html">Embedding</a></span></dt>
|
||||
<dd><dl><dt><span class="section"><a href="python/embedding.html#python.using_the_interpreter">Using the interpreter</a></span></dt></dl></dd>
|
||||
<dt><span class="section"><a href="python/iterators.html">Iterators</a></span></dt>
|
||||
<dt><span class="section"><a href="python/exception.html"> Exception Translation</a></span></dt>
|
||||
<dt><span class="section"><a href="python/techniques.html"> General Techniques</a></span></dt>
|
||||
<dd><dl>
|
||||
<dt><span class="section"><a href="python/techniques.html#python.creating_packages">Creating Packages</a></span></dt>
|
||||
<dt><span class="section"><a href="python/techniques.html#python.extending_wrapped_objects_in_python">Extending Wrapped Objects in Python</a></span></dt>
|
||||
<dt><span class="section"><a href="python/techniques.html#python.reducing_compiling_time">Reducing Compiling Time</a></span></dt>
|
||||
</dl></dd>
|
||||
</dl>
|
||||
</div>
|
||||
<div class="section" lang="en">
|
||||
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
|
||||
<a name="python.quickstart"></a>QuickStart</h2></div></div></div>
|
||||
<p>
|
||||
The Boost Python Library is a framework for interfacing Python and
|
||||
C++. It allows you to quickly and seamlessly expose C++ classes
|
||||
functions and objects to Python, and vice-versa, using no special
|
||||
tools -- just your C++ compiler. It is designed to wrap C++ interfaces
|
||||
non-intrusively, so that you should not have to change the C++ code at
|
||||
all in order to wrap it, making Boost.Python ideal for exposing
|
||||
3rd-party libraries to Python. The library's use of advanced
|
||||
metaprogramming techniques simplifies its syntax for users, so that
|
||||
wrapping code takes on the look of a kind of declarative interface
|
||||
definition language (IDL).</p>
|
||||
<a name="quickstart.hello_world"></a><h2>
|
||||
<a name="id376600"></a>Hello World</h2>
|
||||
<p>
|
||||
Following C/C++ tradition, let's start with the "hello, world". A C++
|
||||
Function:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="keyword">char</span><span class="keyword"> const</span><span class="special">*</span><span class="identifier"> greet</span><span class="special">()</span><span class="special">
|
||||
{</span><span class="keyword">
|
||||
return</span><span class="string"> "hello, world"</span><span class="special">;</span><span class="special">
|
||||
}</span></tt></pre>
|
||||
<p>
|
||||
can be exposed to Python by writing a Boost.Python wrapper:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="preprocessor">#include</span><span class="special"> <</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">python</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span><span class="keyword">
|
||||
using</span><span class="keyword"> namespace</span><span class="identifier"> boost</span><span class="special">::</span><span class="identifier">python</span><span class="special">;</span><span class="identifier">
|
||||
|
||||
BOOST_PYTHON_MODULE</span><span class="special">(</span><span class="identifier">hello</span><span class="special">)</span><span class="special">
|
||||
{</span><span class="identifier">
|
||||
def</span><span class="special">(</span><span class="string">"greet"</span><span class="special">,</span><span class="identifier"> greet</span><span class="special">);</span><span class="special">
|
||||
}</span></tt></pre>
|
||||
<p>
|
||||
That's it. We're done. We can now build this as a shared library. The
|
||||
resulting DLL is now visible to Python. Here's a sample Python session:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="special">>>></span><span class="identifier"> import</span><span class="identifier"> hello</span><span class="special">
|
||||
>>></span><span class="identifier"> print</span><span class="identifier"> hello</span><span class="special">.</span><span class="identifier">greet</span><span class="special">()</span><span class="identifier">
|
||||
hello</span><span class="special">,</span><span class="identifier"> world</span></tt></pre>
|
||||
<div class="blockquote"><blockquote class="blockquote"><p><span class="emphasis"><em><span class="bold"><b>Next stop... Building your Hello World module from start to finish...</b></span></em></span></p></blockquote></div>
|
||||
</div>
|
||||
</div>
|
||||
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
|
||||
<td align="left"><small><p>Last revised: October 12, 2004 at 03:11:11 GMT</p></small></td>
|
||||
<td align="right"><small></small></td>
|
||||
</tr></table>
|
||||
<hr>
|
||||
<div class="spirit-nav"><a accesskey="n" href="python/hello.html"><img src="images/next.png" alt="Next"></a></div>
|
||||
</body>
|
||||
</html>
|
||||
341
doc/tutorial/doc/html/python/embedding.html
Normal file
@@ -0,0 +1,341 @@
|
||||
<html>
|
||||
<head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
|
||||
<title>Embedding</title>
|
||||
<link rel="stylesheet" href="../boostbook.css" type="text/css">
|
||||
<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
|
||||
<link rel="start" href="../index.html" title="Chapter 1. python 1.0">
|
||||
<link rel="up" href="../index.html" title="Chapter 1. python 1.0">
|
||||
<link rel="prev" href="object.html" title=" Object Interface">
|
||||
<link rel="next" href="iterators.html" title="Iterators">
|
||||
</head>
|
||||
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
|
||||
<table cellpadding="2" width="100%">
|
||||
<td valign="top"><img alt="boost.png (6897 bytes)" width="277" height="86" src="../../../../../../../boost.png"></td>
|
||||
<td align="center"><a href="../../../../../../../index.htm">Home</a></td>
|
||||
<td align="center"><a href="../../../../../../libraries.htm">Libraries</a></td>
|
||||
<td align="center"><a href="../../../../../../../people/people.htm">People</a></td>
|
||||
<td align="center"><a href="../../../../../../../more/faq.htm">FAQ</a></td>
|
||||
<td align="center"><a href="../../../../../../../more/index.htm">More</a></td>
|
||||
</table>
|
||||
<hr>
|
||||
<div class="spirit-nav">
|
||||
<a accesskey="p" href="object.html"><img src="../images/prev.png" alt="Prev"></a><a accesskey="u" href="../index.html"><img src="../images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="iterators.html"><img src="../images/next.png" alt="Next"></a>
|
||||
</div>
|
||||
<div class="section" lang="en">
|
||||
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
|
||||
<a name="python.embedding"></a>Embedding</h2></div></div></div>
|
||||
<div class="toc"><dl><dt><span class="section"><a href="embedding.html#python.using_the_interpreter">Using the interpreter</a></span></dt></dl></div>
|
||||
<p>
|
||||
By now you should know how to use Boost.Python to call your C++ code from
|
||||
Python. However, sometimes you may need to do the reverse: call Python code
|
||||
from the C++-side. This requires you to <span class="emphasis"><em>embed</em></span> the Python interpreter
|
||||
into your C++ program.</p>
|
||||
<p>
|
||||
Currently, Boost.Python does not directly support everything you'll need
|
||||
when embedding. Therefore you'll need to use the
|
||||
<a href="http://www.python.org/doc/current/api/api.html" target="_top">Python/C API</a> to fill in
|
||||
the gaps. However, Boost.Python already makes embedding a lot easier and,
|
||||
in a future version, it may become unnecessary to touch the Python/C API at
|
||||
all. So stay tuned... <span class="inlinemediaobject"><img src="../images/smiley.png"></span></p>
|
||||
<a name="embedding.building_embedded_programs"></a><h2>
|
||||
<a name="id460514"></a>Building embedded programs</h2>
|
||||
<p>
|
||||
To be able to use embedding in your programs, they have to be linked to
|
||||
both Boost.Python's and Python's static link library.</p>
|
||||
<p>
|
||||
Boost.Python's static link library comes in two variants. Both are located
|
||||
in Boost's <tt class="literal">/libs/python/build/bin-stage</tt> subdirectory. On Windows, the
|
||||
variants are called <tt class="literal">boost_python.lib</tt> (for release builds) and
|
||||
<tt class="literal">boost_python_debug.lib</tt> (for debugging). If you can't find the libraries,
|
||||
you probably haven't built Boost.Python yet. See
|
||||
<a href="../../../../building.html" target="_top">Building and Testing</a> on how to do this.</p>
|
||||
<p>
|
||||
Python's static link library can be found in the <tt class="literal">/libs</tt> subdirectory of
|
||||
your Python directory. On Windows it is called pythonXY.lib where X.Y is
|
||||
your major Python version number.</p>
|
||||
<p>
|
||||
Additionally, Python's <tt class="literal">/include</tt> subdirectory has to be added to your
|
||||
include path.</p>
|
||||
<p>
|
||||
In a Jamfile, all the above boils down to:</p>
|
||||
<pre class="programlisting"><tt class="literal"> projectroot c:\projects\embedded_program ; # location of the program
|
||||
|
||||
# bring in the rules for python
|
||||
SEARCH on python.jam = $(BOOST_BUILD_PATH) ;
|
||||
include python.jam ;
|
||||
|
||||
exe embedded_program # name of the executable
|
||||
: #sources
|
||||
embedded_program.cpp
|
||||
: # requirements
|
||||
<find-library>boost_python <library-path>c:\boost\libs\python
|
||||
$(PYTHON_PROPERTIES)
|
||||
<library-path>$(PYTHON_LIB_PATH)
|
||||
<find-library>$(PYTHON_EMBEDDED_LIBRARY) ;
|
||||
</tt></pre>
|
||||
<a name="embedding.getting_started"></a><h2>
|
||||
<a name="id460605"></a>Getting started</h2>
|
||||
<p>
|
||||
Being able to build is nice, but there is nothing to build yet. Embedding
|
||||
the Python interpreter into one of your C++ programs requires these 4
|
||||
steps:</p>
|
||||
<div class="orderedlist"><ol type="1">
|
||||
<li>
|
||||
#include <tt class="literal"><boost/python.hpp></tt><p></p>
|
||||
<p></p>
|
||||
</li>
|
||||
<li>
|
||||
Call <a href="http://www.python.org/doc/current/api/initialization.html#l2h-652" target="_top">Py_Initialize</a>() to start the interpreter and create the <tt class="literal"><span class="underline">_main</span>_</tt> module.<p></p>
|
||||
<p></p>
|
||||
</li>
|
||||
<li>
|
||||
Call other Python C API routines to use the interpreter.<p></p>
|
||||
<p></p>
|
||||
</li>
|
||||
<li>
|
||||
Call <a href="http://www.python.org/doc/current/api/initialization.html#l2h-656" target="_top">Py_Finalize</a>() to stop the interpreter and release its resources.
|
||||
</li>
|
||||
</ol></div>
|
||||
<p>
|
||||
(Of course, there can be other C++ code between all of these steps.)</p>
|
||||
<div class="blockquote"><blockquote class="blockquote"><p><span class="emphasis"><em><span class="bold"><b>Now that we can embed the interpreter in our programs, lets see how to put it to use...</b></span></em></span></p></blockquote></div>
|
||||
<div class="section" lang="en">
|
||||
<div class="titlepage"><div><div><h3 class="title">
|
||||
<a name="python.using_the_interpreter"></a>Using the interpreter</h3></div></div></div>
|
||||
<p>
|
||||
As you probably already know, objects in Python are reference-counted.
|
||||
Naturally, the <tt class="literal">PyObject</tt>s of the Python/C API are also reference-counted.
|
||||
There is a difference however. While the reference-counting is fully
|
||||
automatic in Python, the Python/C API requires you to do it
|
||||
<a href="http://www.python.org/doc/current/api/refcounts.html" target="_top">by hand</a>. This is
|
||||
messy and especially hard to get right in the presence of C++ exceptions.
|
||||
Fortunately Boost.Python provides the <a href="../../../../v2/handle.html" target="_top">handle</a> and
|
||||
<a href="../../../../v2/object.html" target="_top">object</a> class templates to automate the process.</p>
|
||||
<a name="using_the_interpreter.reference_counting_handles_and_objects"></a><h2>
|
||||
<a name="id460737"></a>Reference-counting handles and objects</h2>
|
||||
<p>
|
||||
There are two ways in which a function in the Python/C API can return a
|
||||
<tt class="literal">PyObject*</tt>: as a <span class="emphasis"><em>borrowed reference</em></span> or as a <span class="emphasis"><em>new reference</em></span>. Which of
|
||||
these a function uses, is listed in that function's documentation. The two
|
||||
require slightely different approaches to reference-counting but both can
|
||||
be 'handled' by Boost.Python.</p>
|
||||
<p>
|
||||
For a function returning a <span class="emphasis"><em>borrowed reference</em></span> we'll have to tell the
|
||||
<tt class="literal">handle</tt> that the <tt class="literal">PyObject*</tt> is borrowed with the aptly named
|
||||
<a href="../../../../v2/handle.html#borrowed-spec" target="_top">borrowed</a> function. Two functions
|
||||
returning borrowed references are <a href="http://www.python.org/doc/current/api/importing.html#l2h-125" target="_top">PyImport_AddModule</a> and <a href="http://www.python.org/doc/current/api/moduleObjects.html#l2h-594" target="_top">PyModule_GetDict</a>.
|
||||
The former returns a reference to an already imported module, the latter
|
||||
retrieves a module's namespace dictionary. Let's use them to retrieve the
|
||||
namespace of the <tt class="literal"><span class="underline">_main</span>_</tt> module:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">object</span><span class="identifier"> main_module</span><span class="special">((</span><span class="identifier">
|
||||
handle</span><span class="special"><>(</span><span class="identifier">borrowed</span><span class="special">(</span><a href="http://www.python.org/doc/current/api/importing.html#l2h-125" target="_top">PyImport_AddModule</a><span class="special">(</span><span class="string">"__main__"</span><span class="special">)))));</span><span class="identifier">
|
||||
|
||||
object</span><span class="identifier"> main_namespace</span><span class="special"> =</span><span class="identifier"> main_module</span><span class="special">.</span><span class="identifier">attr</span><span class="special">(</span><span class="string">"__dict__"</span><span class="special">);</span></tt></pre>
|
||||
<p>
|
||||
For a function returning a <span class="emphasis"><em>new reference</em></span> we can just create a <tt class="literal">handle</tt>
|
||||
out of the raw <tt class="literal">PyObject*</tt> without wrapping it in a call to borrowed. One
|
||||
such function that returns a new reference is <a href="http://www.python.org/doc/current/api/veryhigh.html#l2h-55" target="_top">PyRun_String</a> which we'll
|
||||
discuss in the next section.</p>
|
||||
<div class="informaltable"><table class="table">
|
||||
<colgroup><col></colgroup>
|
||||
<tbody><tr><td>
|
||||
<span class="inlinemediaobject"><img src="../images/note.png"></span><span class="bold"><b>Handle is a class <span class="emphasis"><em>template</em></span>, so why haven't we been using any template parameters?</b></span><p></p>
|
||||
<p></p>
|
||||
<tt class="literal">handle</tt> has a single template parameter specifying the type of the managed object. This type is <tt class="literal">PyObject</tt> 99% of the time, so the parameter was defaulted to <tt class="literal">PyObject</tt> for convenience. Therefore we can use the shorthand <tt class="literal">handle<></tt> instead of the longer, but equivalent, <tt class="literal">handle<PyObject></tt>.
|
||||
</td></tr></tbody>
|
||||
</table></div>
|
||||
<a name="using_the_interpreter.running_python_code"></a><h2>
|
||||
<a name="id461039"></a>Running Python code</h2>
|
||||
<p>
|
||||
To run Python code from C++ there is a family of functions in the API
|
||||
starting with the PyRun prefix. You can find the full list of these
|
||||
functions <a href="http://www.python.org/doc/current/api/veryhigh.html" target="_top">here</a>. They
|
||||
all work similarly so we will look at only one of them, namely:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">PyObject</span><span class="special">*</span> <a href="http://www.python.org/doc/current/api/veryhigh.html#l2h-55" target="_top">PyRun_String</a><span class="special">(</span><span class="keyword">char</span><span class="special"> *</span><span class="identifier">str</span><span class="special">,</span><span class="keyword"> int</span><span class="identifier"> start</span><span class="special">,</span><span class="identifier"> PyObject</span><span class="special"> *</span><span class="identifier">globals</span><span class="special">,</span><span class="identifier"> PyObject</span><span class="special"> *</span><span class="identifier">locals</span><span class="special">)</span></tt></pre>
|
||||
<p><a href="http://www.python.org/doc/current/api/veryhigh.html#l2h-55" target="_top">PyRun_String</a> takes the code to execute as a null-terminated (C-style)
|
||||
string in its <tt class="literal">str</tt> parameter. The function returns a new reference to a
|
||||
Python object. Which object is returned depends on the <tt class="literal">start</tt> paramater.</p>
|
||||
<p>
|
||||
The <tt class="literal">start</tt> parameter is the start symbol from the Python grammar to use
|
||||
for interpreting the code. The possible values are:</p>
|
||||
<div class="informaltable">
|
||||
<h4>
|
||||
<a name="id461201"></a><span class="table-title">Start symbols</span>
|
||||
</h4>
|
||||
<table class="table">
|
||||
<colgroup>
|
||||
<col>
|
||||
<col>
|
||||
</colgroup>
|
||||
<thead><tr>
|
||||
<th><a href="http://www.python.org/doc/current/api/veryhigh.html#l2h-58" target="_top">Py_eval_input</a></th>
|
||||
<th>for interpreting isolated expressions</th>
|
||||
</tr></thead>
|
||||
<tbody>
|
||||
<tr>
|
||||
<td><a href="http://www.python.org/doc/current/api/veryhigh.html#l2h-59" target="_top">Py_file_input</a></td>
|
||||
<td>for interpreting sequences of statements</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td><a href="http://www.python.org/doc/current/api/veryhigh.html#l2h-60" target="_top">Py_single_input</a></td>
|
||||
<td>for interpreting a single statement</td>
|
||||
</tr>
|
||||
</tbody>
|
||||
</table>
|
||||
</div>
|
||||
<p>
|
||||
When using <a href="http://www.python.org/doc/current/api/veryhigh.html#l2h-58" target="_top">Py_eval_input</a>, the input string must contain a single expression
|
||||
and its result is returned. When using <a href="http://www.python.org/doc/current/api/veryhigh.html#l2h-59" target="_top">Py_file_input</a>, the string can
|
||||
contain an abitrary number of statements and None is returned.
|
||||
<a href="http://www.python.org/doc/current/api/veryhigh.html#l2h-60" target="_top">Py_single_input</a> works in the same way as <a href="http://www.python.org/doc/current/api/veryhigh.html#l2h-59" target="_top">Py_file_input</a> but only accepts a
|
||||
single statement.</p>
|
||||
<p>
|
||||
Lastly, the <tt class="literal">globals</tt> and <tt class="literal">locals</tt> parameters are Python dictionaries
|
||||
containing the globals and locals of the context in which to run the code.
|
||||
For most intents and purposes you can use the namespace dictionary of the
|
||||
<tt class="literal"><span class="underline">_main</span>_</tt> module for both parameters.</p>
|
||||
<p>
|
||||
We have already seen how to get the <tt class="literal"><span class="underline">_main</span>_</tt> module's namespace so let's
|
||||
run some Python code in it:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">object</span><span class="identifier"> main_module</span><span class="special">((</span><span class="identifier">
|
||||
handle</span><span class="special"><>(</span><span class="identifier">borrowed</span><span class="special">(</span><a href="http://www.python.org/doc/current/api/importing.html#l2h-125" target="_top">PyImport_AddModule</a><span class="special">(</span><span class="string">"__main__"</span><span class="special">)))));</span><span class="identifier">
|
||||
|
||||
object</span><span class="identifier"> main_namespace</span><span class="special"> =</span><span class="identifier"> main_module</span><span class="special">.</span><span class="identifier">attr</span><span class="special">(</span><span class="string">"__dict__"</span><span class="special">);</span><span class="identifier">
|
||||
|
||||
handle</span><span class="special"><></span><span class="identifier"> ignored</span><span class="special">((</span><a href="http://www.python.org/doc/current/api/veryhigh.html#l2h-55" target="_top">PyRun_String</a><span class="special">(</span><span class="string">
|
||||
|
||||
"hello = file('hello.txt', 'w')\n"</span><span class="string">
|
||||
"hello.write('Hello world!')\n"</span><span class="string">
|
||||
"hello.close()"</span><span class="special">
|
||||
|
||||
,</span> <a href="http://www.python.org/doc/current/api/veryhigh.html#l2h-59" target="_top">Py_file_input</a><span class="special">
|
||||
,</span><span class="identifier"> main_namespace</span><span class="special">.</span><span class="identifier">ptr</span><span class="special">()</span><span class="special">
|
||||
,</span><span class="identifier"> main_namespace</span><span class="special">.</span><span class="identifier">ptr</span><span class="special">())</span><span class="special">
|
||||
));</span></tt></pre>
|
||||
<p>
|
||||
Because the Python/C API doesn't know anything about <tt class="literal">object</tt>s, we used
|
||||
the object's <tt class="literal">ptr</tt> member function to retrieve the <tt class="literal">PyObject*</tt>.</p>
|
||||
<p>
|
||||
This should create a file called 'hello.txt' in the current directory
|
||||
containing a phrase that is well-known in programming circles.</p>
|
||||
<p><span class="inlinemediaobject"><img src="../images/note.png"></span><span class="bold"><b>Note</b></span> that we wrap the return value of <a href="http://www.python.org/doc/current/api/veryhigh.html#l2h-55" target="_top">PyRun_String</a> in a
|
||||
(nameless) <tt class="literal">handle</tt> even though we are not interested in it. If we didn't
|
||||
do this, the the returned object would be kept alive unnecessarily. Unless
|
||||
you want to be a Dr. Frankenstein, always wrap <tt class="literal">PyObject*</tt>s in <tt class="literal">handle</tt>s.</p>
|
||||
<a name="using_the_interpreter.beyond_handles"></a><h2>
|
||||
<a name="id461639"></a>Beyond handles</h2>
|
||||
<p>
|
||||
It's nice that <tt class="literal">handle</tt> manages the reference counting details for us, but
|
||||
other than that it doesn't do much. Often we'd like to have a more useful
|
||||
class to manipulate Python objects. But we have already seen such a class
|
||||
above, and in the <a href="object.html" target="_top">previous section</a>: the aptly
|
||||
named <tt class="literal">object</tt> class and it's derivatives. We've already seen that they
|
||||
can be constructed from a <tt class="literal">handle</tt>. The following examples should further
|
||||
illustrate this fact:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">object</span><span class="identifier"> main_module</span><span class="special">((</span><span class="identifier">
|
||||
handle</span><span class="special"><>(</span><span class="identifier">borrowed</span><span class="special">(</span><a href="http://www.python.org/doc/current/api/importing.html#l2h-125" target="_top">PyImport_AddModule</a><span class="special">(</span><span class="string">"__main__"</span><span class="special">)))));</span><span class="identifier">
|
||||
|
||||
object</span><span class="identifier"> main_namespace</span><span class="special"> =</span><span class="identifier"> main_module</span><span class="special">.</span><span class="identifier">attr</span><span class="special">(</span><span class="string">"__dict__"</span><span class="special">);</span><span class="identifier">
|
||||
|
||||
handle</span><span class="special"><></span><span class="identifier"> ignored</span><span class="special">((</span><a href="http://www.python.org/doc/current/api/veryhigh.html#l2h-55" target="_top">PyRun_String</a><span class="special">(</span><span class="string">
|
||||
|
||||
"result = 5 ** 2"</span><span class="special">
|
||||
|
||||
,</span> <a href="http://www.python.org/doc/current/api/veryhigh.html#l2h-59" target="_top">Py_file_input</a><span class="special">
|
||||
,</span><span class="identifier"> main_namespace</span><span class="special">.</span><span class="identifier">ptr</span><span class="special">()</span><span class="special">
|
||||
,</span><span class="identifier"> main_namespace</span><span class="special">.</span><span class="identifier">ptr</span><span class="special">())</span><span class="special">
|
||||
));</span><span class="keyword">
|
||||
|
||||
int</span><span class="identifier"> five_squared</span><span class="special"> =</span><span class="identifier"> extract</span><span class="special"><</span><span class="keyword">int</span><span class="special">>(</span><span class="identifier">main_namespace</span><span class="special">[</span><span class="string">"result"</span><span class="special">]);</span></tt></pre>
|
||||
<p>
|
||||
Here we create a dictionary object for the <tt class="literal"><span class="underline">_main</span>_</tt> module's namespace.
|
||||
Then we assign 5 squared to the result variable and read this variable from
|
||||
the dictionary. Another way to achieve the same result is to let
|
||||
<a href="http://www.python.org/doc/current/api/veryhigh.html#l2h-55" target="_top">PyRun_String</a> return the result directly with <a href="http://www.python.org/doc/current/api/veryhigh.html#l2h-58" target="_top">Py_eval_input</a>:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">object</span><span class="identifier"> result</span><span class="special">((</span><span class="identifier">handle</span><span class="special"><>(</span>
|
||||
<a href="http://www.python.org/doc/current/api/veryhigh.html#l2h-55" target="_top">PyRun_String</a><span class="special">(</span><span class="string">"5 ** 2"</span><span class="special">
|
||||
,</span> <a href="http://www.python.org/doc/current/api/veryhigh.html#l2h-58" target="_top">Py_eval_input</a><span class="special">
|
||||
,</span><span class="identifier"> main_namespace</span><span class="special">.</span><span class="identifier">ptr</span><span class="special">()</span><span class="special">
|
||||
,</span><span class="identifier"> main_namespace</span><span class="special">.</span><span class="identifier">ptr</span><span class="special">()))</span><span class="special">
|
||||
));</span><span class="keyword">
|
||||
|
||||
int</span><span class="identifier"> five_squared</span><span class="special"> =</span><span class="identifier"> extract</span><span class="special"><</span><span class="keyword">int</span><span class="special">>(</span><span class="identifier">result</span><span class="special">);</span></tt></pre>
|
||||
<p><span class="inlinemediaobject"><img src="../images/note.png"></span><span class="bold"><b>Note</b></span> that <tt class="literal">object</tt>'s member function to return the wrapped
|
||||
<tt class="literal">PyObject*</tt> is called <tt class="literal">ptr</tt> instead of <tt class="literal">get</tt>. This makes sense if you
|
||||
take into account the different functions that <tt class="literal">object</tt> and <tt class="literal">handle</tt>
|
||||
perform.</p>
|
||||
<a name="using_the_interpreter.exception_handling"></a><h2>
|
||||
<a name="id462209"></a>Exception handling</h2>
|
||||
<p>
|
||||
If an exception occurs in the execution of some Python code, the <a href="http://www.python.org/doc/current/api/veryhigh.html#l2h-55" target="_top">PyRun_String</a>
|
||||
function returns a null pointer. Constructing a <tt class="literal">handle</tt> out of this null
|
||||
pointer throws <a href="../../../../v2/errors.html#error_already_set-spec" target="_top">error_already_set</a>,
|
||||
so basically, the Python exception is automatically translated into a
|
||||
C++ exception when using <tt class="literal">handle</tt>:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="keyword">try</span><span class="special">
|
||||
{</span><span class="identifier">
|
||||
object</span><span class="identifier"> result</span><span class="special">((</span><span class="identifier">handle</span><span class="special"><>(</span><a href="http://www.python.org/doc/current/api/veryhigh.html#l2h-55" target="_top">PyRun_String</a><span class="special">(</span><span class="string">
|
||||
"5/0"</span><span class="special">
|
||||
,</span> <a href="http://www.python.org/doc/current/api/veryhigh.html#l2h-58" target="_top">Py_eval_input</a><span class="special">
|
||||
,</span><span class="identifier"> main_namespace</span><span class="special">.</span><span class="identifier">ptr</span><span class="special">()</span><span class="special">
|
||||
,</span><span class="identifier"> main_namespace</span><span class="special">.</span><span class="identifier">ptr</span><span class="special">()))</span><span class="special">
|
||||
));</span><span class="comment">
|
||||
|
||||
// execution will never get here:
|
||||
</span><span class="keyword"> int</span><span class="identifier"> five_divided_by_zero</span><span class="special"> =</span><span class="identifier"> extract</span><span class="special"><</span><span class="keyword">int</span><span class="special">>(</span><span class="identifier">result</span><span class="special">);</span><span class="special">
|
||||
}</span><span class="keyword">
|
||||
catch</span><span class="special">(</span><span class="identifier">error_already_set</span><span class="special">)</span><span class="special">
|
||||
{</span><span class="comment">
|
||||
// handle the exception in some way
|
||||
</span><span class="special">}</span></tt></pre>
|
||||
<p>
|
||||
The <tt class="literal">error_already_set</tt> exception class doesn't carry any information in itself.
|
||||
To find out more about the Python exception that occurred, you need to use the
|
||||
<a href="http://www.python.org/doc/api/exceptionHandling.html" target="_top">exception handling functions</a>
|
||||
of the Python/C API in your catch-statement. This can be as simple as calling
|
||||
<a href="http://www.python.org/doc/api/exceptionHandling.html#l2h-70" target="_top">PyErr_Print()</a> to
|
||||
print the exception's traceback to the console, or comparing the type of the
|
||||
exception with those of the <a href="http://www.python.org/doc/api/standardExceptions.html%20standard" target="_top">exceptions</a>:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="keyword">catch</span><span class="special">(</span><span class="identifier">error_already_set</span><span class="special">)</span><span class="special">
|
||||
{</span><span class="keyword">
|
||||
if</span><span class="special"> (</span><span class="identifier">PyErr_ExceptionMatches</span><span class="special">(</span><span class="identifier">PyExc_ZeroDivisionError</span><span class="special">))</span><span class="special">
|
||||
{</span><span class="comment">
|
||||
// handle ZeroDivisionError specially
|
||||
</span><span class="special"> }</span><span class="keyword">
|
||||
else</span><span class="special">
|
||||
{</span><span class="comment">
|
||||
// print all other errors to stderr
|
||||
</span><span class="identifier"> PyErr_Print</span><span class="special">();</span><span class="special">
|
||||
}</span><span class="special">
|
||||
}</span></tt></pre>
|
||||
<p>
|
||||
(To retrieve even more information from the exception you can use some of the other
|
||||
exception handling functions listed <a href="http://www.python.org/doc/api/exceptionHandling.html" target="_top">here</a>.)</p>
|
||||
<p>
|
||||
If you'd rather not have <tt class="literal">handle</tt> throw a C++ exception when it is constructed, you
|
||||
can use the <a href="../../../../v2/handle.html#allow_null-spec" target="_top">allow_null</a> function in the same
|
||||
way you'd use borrowed:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">handle</span><span class="special"><></span><span class="identifier"> result</span><span class="special">((</span><span class="identifier">allow_null</span><span class="special">(</span><a href="http://www.python.org/doc/current/api/veryhigh.html#l2h-55" target="_top">PyRun_String</a><span class="special">(</span><span class="string">
|
||||
"5/0"</span><span class="special">
|
||||
,</span> <a href="http://www.python.org/doc/current/api/veryhigh.html#l2h-58" target="_top">Py_eval_input</a><span class="special">
|
||||
,</span><span class="identifier"> main_namespace</span><span class="special">.</span><span class="identifier">ptr</span><span class="special">()</span><span class="special">
|
||||
,</span><span class="identifier"> main_namespace</span><span class="special">.</span><span class="identifier">ptr</span><span class="special">()))));</span><span class="keyword">
|
||||
|
||||
if</span><span class="special"> (!</span><span class="identifier">result</span><span class="special">)</span><span class="comment">
|
||||
// Python exception occurred
|
||||
</span><span class="keyword">else</span><span class="comment">
|
||||
// everything went okay, it's safe to use the result
|
||||
</span></tt></pre>
|
||||
</div>
|
||||
</div>
|
||||
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
|
||||
<td align="left"></td>
|
||||
<td align="right"><small>Copyright © 2002-2004 Joel de Guzman, David Abrahams</small></td>
|
||||
</tr></table>
|
||||
<hr>
|
||||
<div class="spirit-nav">
|
||||
<a accesskey="p" href="object.html"><img src="../images/prev.png" alt="Prev"></a><a accesskey="u" href="../index.html"><img src="../images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="iterators.html"><img src="../images/next.png" alt="Next"></a>
|
||||
</div>
|
||||
</body>
|
||||
</html>
|
||||
54
doc/tutorial/doc/html/python/exception.html
Normal file
@@ -0,0 +1,54 @@
|
||||
<html>
|
||||
<head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
|
||||
<title> Exception Translation</title>
|
||||
<link rel="stylesheet" href="../boostbook.css" type="text/css">
|
||||
<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
|
||||
<link rel="start" href="../index.html" title="Chapter 1. python 1.0">
|
||||
<link rel="up" href="../index.html" title="Chapter 1. python 1.0">
|
||||
<link rel="prev" href="iterators.html" title="Iterators">
|
||||
<link rel="next" href="techniques.html" title=" General Techniques">
|
||||
</head>
|
||||
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
|
||||
<table cellpadding="2" width="100%">
|
||||
<td valign="top"><img alt="boost.png (6897 bytes)" width="277" height="86" src="../../../../../../../boost.png"></td>
|
||||
<td align="center"><a href="../../../../../../../index.htm">Home</a></td>
|
||||
<td align="center"><a href="../../../../../../libraries.htm">Libraries</a></td>
|
||||
<td align="center"><a href="../../../../../../../people/people.htm">People</a></td>
|
||||
<td align="center"><a href="../../../../../../../more/faq.htm">FAQ</a></td>
|
||||
<td align="center"><a href="../../../../../../../more/index.htm">More</a></td>
|
||||
</table>
|
||||
<hr>
|
||||
<div class="spirit-nav">
|
||||
<a accesskey="p" href="iterators.html"><img src="../images/prev.png" alt="Prev"></a><a accesskey="u" href="../index.html"><img src="../images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="techniques.html"><img src="../images/next.png" alt="Next"></a>
|
||||
</div>
|
||||
<div class="section" lang="en">
|
||||
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
|
||||
<a name="python.exception"></a> Exception Translation</h2></div></div></div>
|
||||
<p>
|
||||
All C++ exceptions must be caught at the boundary with Python code. This
|
||||
boundary is the point where C++ meets Python. Boost.Python provides a
|
||||
default exception handler that translates selected standard exceptions,
|
||||
then gives up:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">raise</span><span class="identifier"> RuntimeError</span><span class="special">,</span><span class="char"> 'unidentifiable C++ Exception'</span></tt></pre>
|
||||
<p>
|
||||
Users may provide custom translation. Here's an example:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="keyword">struct</span><span class="identifier"> PodBayDoorException</span><span class="special">;</span><span class="keyword">
|
||||
void</span><span class="identifier"> translator</span><span class="special">(</span><span class="identifier">PodBayDoorException</span><span class="keyword"> const</span><span class="special">&</span><span class="identifier"> x</span><span class="special">)</span><span class="special"> {</span><span class="identifier">
|
||||
PyErr_SetString</span><span class="special">(</span><span class="identifier">PyExc_UserWarning</span><span class="special">,</span><span class="string"> "I'm sorry Dave..."</span><span class="special">);</span><span class="special">
|
||||
}</span><span class="identifier">
|
||||
BOOST_PYTHON_MODULE</span><span class="special">(</span><span class="identifier">kubrick</span><span class="special">)</span><span class="special"> {</span><span class="identifier">
|
||||
register_exception_translator</span><span class="special"><</span><span class="identifier">
|
||||
PodBayDoorException</span><span class="special">>(</span><span class="identifier">translator</span><span class="special">);</span><span class="special">
|
||||
...</span></tt></pre>
|
||||
</div>
|
||||
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
|
||||
<td align="left"></td>
|
||||
<td align="right"><small>Copyright © 2002-2004 Joel de Guzman, David Abrahams</small></td>
|
||||
</tr></table>
|
||||
<hr>
|
||||
<div class="spirit-nav">
|
||||
<a accesskey="p" href="iterators.html"><img src="../images/prev.png" alt="Prev"></a><a accesskey="u" href="../index.html"><img src="../images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="techniques.html"><img src="../images/next.png" alt="Next"></a>
|
||||
</div>
|
||||
</body>
|
||||
</html>
|
||||
475
doc/tutorial/doc/html/python/exposing.html
Normal file
@@ -0,0 +1,475 @@
|
||||
<html>
|
||||
<head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
|
||||
<title> Exposing Classes</title>
|
||||
<link rel="stylesheet" href="../boostbook.css" type="text/css">
|
||||
<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
|
||||
<link rel="start" href="../index.html" title="Chapter 1. python 1.0">
|
||||
<link rel="up" href="../index.html" title="Chapter 1. python 1.0">
|
||||
<link rel="prev" href="hello.html" title=" Building Hello World">
|
||||
<link rel="next" href="functions.html" title="Functions">
|
||||
</head>
|
||||
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
|
||||
<table cellpadding="2" width="100%">
|
||||
<td valign="top"><img alt="boost.png (6897 bytes)" width="277" height="86" src="../../../../../../../boost.png"></td>
|
||||
<td align="center"><a href="../../../../../../../index.htm">Home</a></td>
|
||||
<td align="center"><a href="../../../../../../libraries.htm">Libraries</a></td>
|
||||
<td align="center"><a href="../../../../../../../people/people.htm">People</a></td>
|
||||
<td align="center"><a href="../../../../../../../more/faq.htm">FAQ</a></td>
|
||||
<td align="center"><a href="../../../../../../../more/index.htm">More</a></td>
|
||||
</table>
|
||||
<hr>
|
||||
<div class="spirit-nav">
|
||||
<a accesskey="p" href="hello.html"><img src="../images/prev.png" alt="Prev"></a><a accesskey="u" href="../index.html"><img src="../images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="functions.html"><img src="../images/next.png" alt="Next"></a>
|
||||
</div>
|
||||
<div class="section" lang="en">
|
||||
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
|
||||
<a name="python.exposing"></a> Exposing Classes</h2></div></div></div>
|
||||
<div class="toc"><dl>
|
||||
<dt><span class="section"><a href="exposing.html#python.constructors">Constructors</a></span></dt>
|
||||
<dt><span class="section"><a href="exposing.html#python.class_data_members">Class Data Members</a></span></dt>
|
||||
<dt><span class="section"><a href="exposing.html#python.class_properties">Class Properties</a></span></dt>
|
||||
<dt><span class="section"><a href="exposing.html#python.inheritance">Inheritance</a></span></dt>
|
||||
<dt><span class="section"><a href="exposing.html#python.class_virtual_functions">Class Virtual Functions</a></span></dt>
|
||||
<dt><span class="section"><a href="exposing.html#python.virtual_functions_with_default_implementations">Virtual Functions with Default Implementations</a></span></dt>
|
||||
<dt><span class="section"><a href="exposing.html#python.class_operators_special_functions">Class Operators/Special Functions</a></span></dt>
|
||||
</dl></div>
|
||||
<p>
|
||||
Now let's expose a C++ class to Python.</p>
|
||||
<p>
|
||||
Consider a C++ class/struct that we want to expose to Python:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="keyword">struct</span><span class="identifier"> World</span><span class="special">
|
||||
{</span><span class="keyword">
|
||||
void</span><span class="identifier"> set</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="identifier"> msg</span><span class="special">)</span><span class="special"> {</span><span class="keyword"> this</span><span class="special">-></span><span class="identifier">msg</span><span class="special"> =</span><span class="identifier"> msg</span><span class="special">;</span><span class="special"> }</span><span class="identifier">
|
||||
std</span><span class="special">::</span><span class="identifier">string</span><span class="identifier"> greet</span><span class="special">()</span><span class="special"> {</span><span class="keyword"> return</span><span class="identifier"> msg</span><span class="special">;</span><span class="special"> }</span><span class="identifier">
|
||||
std</span><span class="special">::</span><span class="identifier">string</span><span class="identifier"> msg</span><span class="special">;</span><span class="special">
|
||||
};</span></tt></pre>
|
||||
<p>
|
||||
We can expose this to Python by writing a corresponding Boost.Python
|
||||
C++ Wrapper:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="preprocessor">#include</span><span class="special"> <</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">python</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span><span class="keyword">
|
||||
using</span><span class="keyword"> namespace</span><span class="identifier"> boost</span><span class="special">::</span><span class="identifier">python</span><span class="special">;</span><span class="identifier">
|
||||
|
||||
BOOST_PYTHON_MODULE</span><span class="special">(</span><span class="identifier">hello</span><span class="special">)</span><span class="special">
|
||||
{</span><span class="identifier">
|
||||
class_</span><span class="special"><</span><span class="identifier">World</span><span class="special">>(</span><span class="string">"World"</span><span class="special">)</span><span class="special">
|
||||
.</span><span class="identifier">def</span><span class="special">(</span><span class="string">"greet"</span><span class="special">,</span><span class="special"> &</span><span class="identifier">World</span><span class="special">::</span><span class="identifier">greet</span><span class="special">)</span><span class="special">
|
||||
.</span><span class="identifier">def</span><span class="special">(</span><span class="string">"set"</span><span class="special">,</span><span class="special"> &</span><span class="identifier">World</span><span class="special">::</span><span class="identifier">set</span><span class="special">)</span><span class="special">
|
||||
;</span><span class="special">
|
||||
}</span></tt></pre>
|
||||
<p>
|
||||
Here, we wrote a C++ class wrapper that exposes the member functions
|
||||
<tt class="literal">greet</tt> and <tt class="literal">set</tt>. Now, after building our module as a shared library, we
|
||||
may use our class <tt class="literal">World</tt> in Python. Here's a sample Python session:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="special">>>></span><span class="identifier"> import</span><span class="identifier"> hello</span><span class="special">
|
||||
>>></span><span class="identifier"> planet</span><span class="special"> =</span><span class="identifier"> hello</span><span class="special">.</span><span class="identifier">World</span><span class="special">()</span><span class="special">
|
||||
>>></span><span class="identifier"> planet</span><span class="special">.</span><span class="identifier">set</span><span class="special">(</span><span class="char">'howdy'</span><span class="special">)</span><span class="special">
|
||||
>>></span><span class="identifier"> planet</span><span class="special">.</span><span class="identifier">greet</span><span class="special">()</span><span class="char">
|
||||
'howdy'</span></tt></pre>
|
||||
<div class="section" lang="en">
|
||||
<div class="titlepage"><div><div><h3 class="title">
|
||||
<a name="python.constructors"></a>Constructors</h3></div></div></div>
|
||||
<p>
|
||||
Our previous example didn't have any explicit constructors.
|
||||
Since <tt class="literal">World</tt> is declared as a plain struct, it has an implicit default
|
||||
constructor. Boost.Python exposes the default constructor by default,
|
||||
which is why we were able to write</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="special">>>></span><span class="identifier"> planet</span><span class="special"> =</span><span class="identifier"> hello</span><span class="special">.</span><span class="identifier">World</span><span class="special">()</span></tt></pre>
|
||||
<p>
|
||||
We may wish to wrap a class with a non-default constructor. Let us
|
||||
build on our previous example:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="keyword">struct</span><span class="identifier"> World</span><span class="special">
|
||||
{</span><span class="identifier">
|
||||
World</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="identifier"> msg</span><span class="special">):</span><span class="identifier"> msg</span><span class="special">(</span><span class="identifier">msg</span><span class="special">)</span><span class="special"> {}</span><span class="comment"> // added constructor
|
||||
</span><span class="keyword"> void</span><span class="identifier"> set</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="identifier"> msg</span><span class="special">)</span><span class="special"> {</span><span class="keyword"> this</span><span class="special">-></span><span class="identifier">msg</span><span class="special"> =</span><span class="identifier"> msg</span><span class="special">;</span><span class="special"> }</span><span class="identifier">
|
||||
std</span><span class="special">::</span><span class="identifier">string</span><span class="identifier"> greet</span><span class="special">()</span><span class="special"> {</span><span class="keyword"> return</span><span class="identifier"> msg</span><span class="special">;</span><span class="special"> }</span><span class="identifier">
|
||||
std</span><span class="special">::</span><span class="identifier">string</span><span class="identifier"> msg</span><span class="special">;</span><span class="special">
|
||||
};</span></tt></pre>
|
||||
<p>
|
||||
This time <tt class="literal">World</tt> has no default constructor; our previous
|
||||
wrapping code would fail to compile when the library tried to expose
|
||||
it. We have to tell <tt class="literal">class_<World></tt> about the constructor we want to
|
||||
expose instead.</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="preprocessor">#include</span><span class="special"> <</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">python</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span><span class="keyword">
|
||||
using</span><span class="keyword"> namespace</span><span class="identifier"> boost</span><span class="special">::</span><span class="identifier">python</span><span class="special">;</span><span class="identifier">
|
||||
|
||||
BOOST_PYTHON_MODULE</span><span class="special">(</span><span class="identifier">hello</span><span class="special">)</span><span class="special">
|
||||
{</span><span class="identifier">
|
||||
class_</span><span class="special"><</span><span class="identifier">World</span><span class="special">>(</span><span class="string">"World"</span><span class="special">,</span><span class="identifier"> init</span><span class="special"><</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">>())</span><span class="special">
|
||||
.</span><span class="identifier">def</span><span class="special">(</span><span class="string">"greet"</span><span class="special">,</span><span class="special"> &</span><span class="identifier">World</span><span class="special">::</span><span class="identifier">greet</span><span class="special">)</span><span class="special">
|
||||
.</span><span class="identifier">def</span><span class="special">(</span><span class="string">"set"</span><span class="special">,</span><span class="special"> &</span><span class="identifier">World</span><span class="special">::</span><span class="identifier">set</span><span class="special">)</span><span class="special">
|
||||
;</span><span class="special">
|
||||
}</span></tt></pre>
|
||||
<p><tt class="literal">init<std::string>()</tt> exposes the constructor taking in a
|
||||
<tt class="literal">std::string</tt> (in Python, constructors are spelled
|
||||
"<tt class="literal">"<span class="underline">_init</span>_"</tt>").</p>
|
||||
<p>
|
||||
We can expose additional constructors by passing more <tt class="literal">init<...></tt>s to
|
||||
the <tt class="literal">def()</tt> member function. Say for example we have another World
|
||||
constructor taking in two doubles:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">class_</span><span class="special"><</span><span class="identifier">World</span><span class="special">>(</span><span class="string">"World"</span><span class="special">,</span><span class="identifier"> init</span><span class="special"><</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">>())</span><span class="special">
|
||||
.</span><span class="identifier">def</span><span class="special">(</span><span class="identifier">init</span><span class="special"><</span><span class="keyword">double</span><span class="special">,</span><span class="keyword"> double</span><span class="special">>())</span><span class="special">
|
||||
.</span><span class="identifier">def</span><span class="special">(</span><span class="string">"greet"</span><span class="special">,</span><span class="special"> &</span><span class="identifier">World</span><span class="special">::</span><span class="identifier">greet</span><span class="special">)</span><span class="special">
|
||||
.</span><span class="identifier">def</span><span class="special">(</span><span class="string">"set"</span><span class="special">,</span><span class="special"> &</span><span class="identifier">World</span><span class="special">::</span><span class="identifier">set</span><span class="special">)</span><span class="special">
|
||||
;</span></tt></pre>
|
||||
<p>
|
||||
On the other hand, if we do not wish to expose any constructors at
|
||||
all, we may use <tt class="literal">no_init</tt> instead:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">class_</span><span class="special"><</span><span class="identifier">Abstract</span><span class="special">>(</span><span class="string">"Abstract"</span><span class="special">,</span><span class="identifier"> no_init</span><span class="special">)</span></tt></pre>
|
||||
<p>
|
||||
This actually adds an <tt class="literal"><span class="underline">_init</span>_</tt> method which always raises a
|
||||
Python RuntimeError exception.</p>
|
||||
</div>
|
||||
<div class="section" lang="en">
|
||||
<div class="titlepage"><div><div><h3 class="title">
|
||||
<a name="python.class_data_members"></a>Class Data Members</h3></div></div></div>
|
||||
<p>
|
||||
Data members may also be exposed to Python so that they can be
|
||||
accessed as attributes of the corresponding Python class. Each data
|
||||
member that we wish to be exposed may be regarded as <span class="bold"><b>read-only</b></span> or
|
||||
<span class="bold"><b>read-write</b></span>. Consider this class <tt class="literal">Var</tt>:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="keyword">struct</span><span class="identifier"> Var</span><span class="special">
|
||||
{</span><span class="identifier">
|
||||
Var</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="identifier"> name</span><span class="special">)</span><span class="special"> :</span><span class="identifier"> name</span><span class="special">(</span><span class="identifier">name</span><span class="special">),</span><span class="identifier"> value</span><span class="special">()</span><span class="special"> {}</span><span class="identifier">
|
||||
std</span><span class="special">::</span><span class="identifier">string</span><span class="keyword"> const</span><span class="identifier"> name</span><span class="special">;</span><span class="keyword">
|
||||
float</span><span class="identifier"> value</span><span class="special">;</span><span class="special">
|
||||
};</span></tt></pre>
|
||||
<p>
|
||||
Our C++ <tt class="literal">Var</tt> class and its data members can be exposed to Python:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">class_</span><span class="special"><</span><span class="identifier">Var</span><span class="special">>(</span><span class="string">"Var"</span><span class="special">,</span><span class="identifier"> init</span><span class="special"><</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">>())</span><span class="special">
|
||||
.</span><span class="identifier">def_readonly</span><span class="special">(</span><span class="string">"name"</span><span class="special">,</span><span class="special"> &</span><span class="identifier">Var</span><span class="special">::</span><span class="identifier">name</span><span class="special">)</span><span class="special">
|
||||
.</span><span class="identifier">def_readwrite</span><span class="special">(</span><span class="string">"value"</span><span class="special">,</span><span class="special"> &</span><span class="identifier">Var</span><span class="special">::</span><span class="identifier">value</span><span class="special">);</span></tt></pre>
|
||||
<p>
|
||||
Then, in Python, assuming we have placed our Var class inside the namespace
|
||||
hello as we did before:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="special">>>></span><span class="identifier"> x</span><span class="special"> =</span><span class="identifier"> hello</span><span class="special">.</span><span class="identifier">Var</span><span class="special">(</span><span class="char">'pi'</span><span class="special">)</span><span class="special">
|
||||
>>></span><span class="identifier"> x</span><span class="special">.</span><span class="identifier">value</span><span class="special"> =</span><span class="number"> 3.14</span><span class="special">
|
||||
>>></span><span class="identifier"> print</span><span class="identifier"> x</span><span class="special">.</span><span class="identifier">name</span><span class="special">,</span><span class="char"> 'is around'</span><span class="special">,</span><span class="identifier"> x</span><span class="special">.</span><span class="identifier">value</span><span class="identifier">
|
||||
pi</span><span class="identifier"> is</span><span class="identifier"> around</span><span class="number"> 3.14</span></tt></pre>
|
||||
<p>
|
||||
Note that <tt class="literal">name</tt> is exposed as <span class="bold"><b>read-only</b></span> while <tt class="literal">value</tt> is exposed
|
||||
as <span class="bold"><b>read-write</b></span>.</p>
|
||||
<pre class="programlisting"><tt class="literal"> >>> x.name = 'e' # can't change name
|
||||
Traceback (most recent call last):
|
||||
File "<stdin>", line 1, in ?
|
||||
AttributeError: can't set attribute
|
||||
</tt></pre>
|
||||
</div>
|
||||
<div class="section" lang="en">
|
||||
<div class="titlepage"><div><div><h3 class="title">
|
||||
<a name="python.class_properties"></a>Class Properties</h3></div></div></div>
|
||||
<p>
|
||||
In C++, classes with public data members are usually frowned
|
||||
upon. Well designed classes that take advantage of encapsulation hide
|
||||
the class' data members. The only way to access the class' data is
|
||||
through access (getter/setter) functions. Access functions expose class
|
||||
properties. Here's an example:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="keyword">struct</span><span class="identifier"> Num</span><span class="special">
|
||||
{</span><span class="identifier">
|
||||
Num</span><span class="special">();</span><span class="keyword">
|
||||
float</span><span class="identifier"> get</span><span class="special">()</span><span class="keyword"> const</span><span class="special">;</span><span class="keyword">
|
||||
void</span><span class="identifier"> set</span><span class="special">(</span><span class="keyword">float</span><span class="identifier"> value</span><span class="special">);</span><span class="special">
|
||||
...</span><span class="special">
|
||||
};</span></tt></pre>
|
||||
<p>
|
||||
However, in Python attribute access is fine; it doesn't neccessarily break
|
||||
encapsulation to let users handle attributes directly, because the
|
||||
attributes can just be a different syntax for a method call. Wrapping our
|
||||
<tt class="literal">Num</tt> class using Boost.Python:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">class_</span><span class="special"><</span><span class="identifier">Num</span><span class="special">>(</span><span class="string">"Num"</span><span class="special">)</span><span class="special">
|
||||
.</span><span class="identifier">add_property</span><span class="special">(</span><span class="string">"rovalue"</span><span class="special">,</span><span class="special"> &</span><span class="identifier">Num</span><span class="special">::</span><span class="identifier">get</span><span class="special">)</span><span class="special">
|
||||
.</span><span class="identifier">add_property</span><span class="special">(</span><span class="string">"value"</span><span class="special">,</span><span class="special"> &</span><span class="identifier">Num</span><span class="special">::</span><span class="identifier">get</span><span class="special">,</span><span class="special"> &</span><span class="identifier">Num</span><span class="special">::</span><span class="identifier">set</span><span class="special">);</span></tt></pre>
|
||||
<p>
|
||||
And at last, in Python:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="special">>>></span><span class="identifier"> x</span><span class="special"> =</span><span class="identifier"> Num</span><span class="special">()</span><span class="special">
|
||||
>>></span><span class="identifier"> x</span><span class="special">.</span><span class="identifier">value</span><span class="special"> =</span><span class="number"> 3.14</span><span class="special">
|
||||
>>></span><span class="identifier"> x</span><span class="special">.</span><span class="identifier">value</span><span class="special">,</span><span class="identifier"> x</span><span class="special">.</span><span class="identifier">rovalue</span><span class="special">
|
||||
(</span><span class="number">3.14</span><span class="special">,</span><span class="number"> 3.14</span><span class="special">)</span><span class="special">
|
||||
>>></span><span class="identifier"> x</span><span class="special">.</span><span class="identifier">rovalue</span><span class="special"> =</span><span class="number"> 2.17</span> #<span class="identifier"> error</span><span class="special">!</span></tt></pre>
|
||||
<p>
|
||||
Take note that the class property <tt class="literal">rovalue</tt> is exposed as <span class="bold"><b>read-only</b></span>
|
||||
since the <tt class="literal">rovalue</tt> setter member function is not passed in:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="special">.</span><span class="identifier">add_property</span><span class="special">(</span><span class="string">"rovalue"</span><span class="special">,</span><span class="special"> &</span><span class="identifier">Num</span><span class="special">::</span><span class="identifier">get</span><span class="special">)</span></tt></pre>
|
||||
</div>
|
||||
<div class="section" lang="en">
|
||||
<div class="titlepage"><div><div><h3 class="title">
|
||||
<a name="python.inheritance"></a>Inheritance</h3></div></div></div>
|
||||
<p>
|
||||
In the previous examples, we dealt with classes that are not polymorphic.
|
||||
This is not often the case. Much of the time, we will be wrapping
|
||||
polymorphic classes and class hierarchies related by inheritance. We will
|
||||
often have to write Boost.Python wrappers for classes that are derived from
|
||||
abstract base classes.</p>
|
||||
<p>
|
||||
Consider this trivial inheritance structure:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="keyword">struct</span><span class="identifier"> Base</span><span class="special"> {</span><span class="keyword"> virtual</span><span class="special"> ~</span><span class="identifier">Base</span><span class="special">();</span><span class="special"> };</span><span class="keyword">
|
||||
struct</span><span class="identifier"> Derived</span><span class="special"> :</span><span class="identifier"> Base</span><span class="special"> {};</span></tt></pre>
|
||||
<p>
|
||||
And a set of C++ functions operating on <tt class="literal">Base</tt> and <tt class="literal">Derived</tt> object
|
||||
instances:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="keyword">void</span><span class="identifier"> b</span><span class="special">(</span><span class="identifier">Base</span><span class="special">*);</span><span class="keyword">
|
||||
void</span><span class="identifier"> d</span><span class="special">(</span><span class="identifier">Derived</span><span class="special">*);</span><span class="identifier">
|
||||
Base</span><span class="special">*</span><span class="identifier"> factory</span><span class="special">()</span><span class="special"> {</span><span class="keyword"> return</span><span class="keyword"> new</span><span class="identifier"> Derived</span><span class="special">;</span><span class="special"> }</span></tt></pre>
|
||||
<p>
|
||||
We've seen how we can wrap the base class <tt class="literal">Base</tt>:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">class_</span><span class="special"><</span><span class="identifier">Base</span><span class="special">>(</span><span class="string">"Base"</span><span class="special">)</span><span class="comment">
|
||||
/*...*/</span><span class="special">
|
||||
;</span></tt></pre>
|
||||
<p>
|
||||
Now we can inform Boost.Python of the inheritance relationship between
|
||||
<tt class="literal">Derived</tt> and its base class <tt class="literal">Base</tt>. Thus:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">class_</span><span class="special"><</span><span class="identifier">Derived</span><span class="special">,</span><span class="identifier"> bases</span><span class="special"><</span><span class="identifier">Base</span><span class="special">></span><span class="special"> >(</span><span class="string">"Derived"</span><span class="special">)</span><span class="comment">
|
||||
/*...*/</span><span class="special">
|
||||
;</span></tt></pre>
|
||||
<p>
|
||||
Doing so, we get some things for free:</p>
|
||||
<div class="orderedlist"><ol type="1">
|
||||
<li>
|
||||
Derived automatically inherits all of Base's Python methods
|
||||
(wrapped C++ member functions)
|
||||
</li>
|
||||
<li>
|
||||
<span class="bold"><b>If</b></span> Base is polymorphic, <tt class="literal">Derived</tt> objects which have been passed to
|
||||
Python via a pointer or reference to <tt class="literal">Base</tt> can be passed where a pointer
|
||||
or reference to <tt class="literal">Derived</tt> is expected.
|
||||
</li>
|
||||
</ol></div>
|
||||
<p>
|
||||
Now, we shall expose the C++ free functions <tt class="literal">b</tt> and <tt class="literal">d</tt> and <tt class="literal">factory</tt>:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">def</span><span class="special">(</span><span class="string">"b"</span><span class="special">,</span><span class="identifier"> b</span><span class="special">);</span><span class="identifier">
|
||||
def</span><span class="special">(</span><span class="string">"d"</span><span class="special">,</span><span class="identifier"> d</span><span class="special">);</span><span class="identifier">
|
||||
def</span><span class="special">(</span><span class="string">"factory"</span><span class="special">,</span><span class="identifier"> factory</span><span class="special">);</span></tt></pre>
|
||||
<p>
|
||||
Note that free function <tt class="literal">factory</tt> is being used to generate new
|
||||
instances of class <tt class="literal">Derived</tt>. In such cases, we use
|
||||
<tt class="literal">return_value_policy<manage_new_object></tt> to instruct Python to adopt
|
||||
the pointer to <tt class="literal">Base</tt> and hold the instance in a new Python <tt class="literal">Base</tt>
|
||||
object until the the Python object is destroyed. We shall see more of
|
||||
Boost.Python <a href="functions.html#python.call_policies" title="Call Policies">call policies</a> later.</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="comment">// Tell Python to take ownership of factory's result
|
||||
</span><span class="identifier">def</span><span class="special">(</span><span class="string">"factory"</span><span class="special">,</span><span class="identifier"> factory</span><span class="special">,</span><span class="identifier">
|
||||
return_value_policy</span><span class="special"><</span><span class="identifier">manage_new_object</span><span class="special">>());</span></tt></pre>
|
||||
</div>
|
||||
<div class="section" lang="en">
|
||||
<div class="titlepage"><div><div><h3 class="title">
|
||||
<a name="python.class_virtual_functions"></a>Class Virtual Functions</h3></div></div></div>
|
||||
<p>
|
||||
In this section, we shall learn how to make functions behave polymorphically
|
||||
through virtual functions. Continuing our example, let us add a virtual function
|
||||
to our <tt class="literal">Base</tt> class:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="keyword">struct</span><span class="identifier"> Base</span><span class="special">
|
||||
{</span><span class="keyword">
|
||||
virtual</span><span class="special"> ~</span><span class="identifier">Base</span><span class="special">()</span><span class="special"> {}</span><span class="keyword">
|
||||
virtual</span><span class="keyword"> int</span><span class="identifier"> f</span><span class="special">()</span><span class="special"> =</span><span class="number"> 0</span><span class="special">;</span><span class="special">
|
||||
};</span></tt></pre>
|
||||
<p>
|
||||
One of the goals of Boost.Python is to be minimally intrusive on an existing C++
|
||||
design. In principle, it should be possible to expose the interface for a 3rd
|
||||
party library without changing it. It is not ideal to add anything to our class
|
||||
<tt class="computeroutput"><span class="identifier">Base</span></tt>. Yet, when you have a virtual function that's going to be overridden in
|
||||
Python and called polymorphically <span class="bold"><b>from C++</b></span>, we'll need to add some
|
||||
scaffoldings to make things work properly. What we'll do is write a class
|
||||
wrapper that derives from <tt class="computeroutput"><span class="identifier">Base</span></tt> that will unintrusively hook into the virtual
|
||||
functions so that a Python override may be called:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="keyword">struct</span><span class="identifier"> BaseWrap</span><span class="special"> :</span><span class="identifier"> Base</span><span class="special">,</span><span class="identifier"> wrapper</span><span class="special"><</span><span class="identifier">Base</span><span class="special">></span><span class="special">
|
||||
{</span><span class="keyword">
|
||||
int</span><span class="identifier"> f</span><span class="special">()</span><span class="special">
|
||||
{</span><span class="keyword">
|
||||
return</span><span class="keyword"> this</span><span class="special">-></span><span class="identifier">get_override</span><span class="special">(</span><span class="string">"f"</span><span class="special">)();</span><span class="special">
|
||||
}</span><span class="special">
|
||||
};</span></tt></pre>
|
||||
<p>
|
||||
Notice too that in addition to inheriting from <tt class="computeroutput"><span class="identifier">Base</span></tt>, we also multiply-
|
||||
inherited <tt class="computeroutput"><span class="identifier">wrapper</span><span class="special"><</span><span class="identifier">Base</span><span class="special">></span></tt> (See <a href="../../../../v2/wrapper.html" target="_top">Wrapper</a>). The
|
||||
<tt class="computeroutput"><span class="identifier">wrapper</span></tt> template makes the job of wrapping classes that are meant to
|
||||
overridden in Python, easier.</p>
|
||||
<div class="informaltable"><table class="table">
|
||||
<colgroup><col></colgroup>
|
||||
<tbody><tr><td>
|
||||
<span class="inlinemediaobject"><img src="../images/alert.png"></span> MSVC6/7 Workaround<p></p>
|
||||
<p></p>
|
||||
|
||||
If you are using Microsoft Visual C++ 6 or 7, you have to write <tt class="computeroutput"><span class="identifier">f</span></tt> as:<p></p>
|
||||
<p></p>
|
||||
<tt class="computeroutput"><span class="keyword">return</span><span class="identifier"> call</span><span class="special"><</span><span class="keyword">int</span><span class="special">>(</span><span class="keyword">this</span><span class="special">-></span><span class="identifier">get_override</span><span class="special">(</span><span class="string">"f"</span><span class="special">).</span><span class="identifier">ptr</span><span class="special">());</span></tt>.</td></tr></tbody>
|
||||
</table></div>
|
||||
<p>
|
||||
BaseWrap's overridden virtual member function <tt class="computeroutput"><span class="identifier">f</span></tt> in effect calls the
|
||||
corresponding method of the Python object through <tt class="computeroutput"><span class="identifier">get_override</span></tt>.</p>
|
||||
<p>
|
||||
Finally, exposing <tt class="computeroutput"><span class="identifier">Base</span></tt>:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">class_</span><span class="special"><</span><span class="identifier">BaseWrap</span><span class="special">,</span><span class="identifier"> boost</span><span class="special">::</span><span class="identifier">noncopyable</span><span class="special">>(</span><span class="string">"Base"</span><span class="special">)</span><span class="special">
|
||||
.</span><span class="identifier">def</span><span class="special">(</span><span class="string">"f"</span><span class="special">,</span><span class="identifier"> pure_virtual</span><span class="special">(&</span><span class="identifier">Base</span><span class="special">::</span><span class="identifier">f</span><span class="special">))</span><span class="special">
|
||||
;</span></tt></pre>
|
||||
<p><tt class="computeroutput"><span class="identifier">pure_virtual</span></tt> signals Boost.Python that the function <tt class="computeroutput"><span class="identifier">f</span></tt> is a pure virtual
|
||||
function.</p>
|
||||
<div class="informaltable"><table class="table">
|
||||
<colgroup><col></colgroup>
|
||||
<tbody><tr><td>
|
||||
<span class="inlinemediaobject"><img src="../images/note.png"></span><span class="bold"><b>member function and methods</b></span><p></p>
|
||||
<p></p>
|
||||
Python, like
|
||||
many object oriented languages uses the term <span class="bold"><b>methods</b></span>. Methods
|
||||
correspond roughly to C++'s <span class="bold"><b>member functions</b></span>
|
||||
</td></tr></tbody>
|
||||
</table></div>
|
||||
</div>
|
||||
<div class="section" lang="en">
|
||||
<div class="titlepage"><div><div><h3 class="title">
|
||||
<a name="python.virtual_functions_with_default_implementations"></a>Virtual Functions with Default Implementations</h3></div></div></div>
|
||||
<p>
|
||||
We've seen in the previous section how classes with pure virtual functions are
|
||||
wrapped using Boost.Python's <a href="../../../../v2//wrapper.html" target="_top">class wrapper</a>
|
||||
facilities. If we wish to wrap <span class="bold"><b>non</b></span>-pure-virtual functions instead, the
|
||||
mechanism is a bit different.</p>
|
||||
<p>
|
||||
Recall that in the <a href="exposing.html#python.class_virtual_functions" title="Class Virtual Functions">previous section</a>, we
|
||||
wrapped a class with a pure virtual function that we then implemented in C++, or
|
||||
Python classes derived from it. Our base class:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="keyword">struct</span><span class="identifier"> Base</span><span class="special">
|
||||
{</span><span class="keyword">
|
||||
virtual</span><span class="keyword"> int</span><span class="identifier"> f</span><span class="special">()</span><span class="special"> =</span><span class="number"> 0</span><span class="special">;</span><span class="special">
|
||||
};</span></tt></pre>
|
||||
<p>
|
||||
had a pure virtual function <tt class="literal">f</tt>. If, however, its member function <tt class="literal">f</tt> was
|
||||
not declared as pure virtual:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="keyword">struct</span><span class="identifier"> Base</span><span class="special">
|
||||
{</span><span class="keyword">
|
||||
virtual</span><span class="special"> ~</span><span class="identifier">Base</span><span class="special">()</span><span class="special"> {}</span><span class="keyword">
|
||||
virtual</span><span class="keyword"> int</span><span class="identifier"> f</span><span class="special">()</span><span class="special"> {</span><span class="keyword"> return</span><span class="number"> 0</span><span class="special">;</span><span class="special"> }</span><span class="special">
|
||||
};</span></tt></pre>
|
||||
<p>
|
||||
We wrap it this way:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="keyword">struct</span><span class="identifier"> BaseWrap</span><span class="special"> :</span><span class="identifier"> Base</span><span class="special">,</span><span class="identifier"> wrapper</span><span class="special"><</span><span class="identifier">Base</span><span class="special">></span><span class="special">
|
||||
{</span><span class="keyword">
|
||||
int</span><span class="identifier"> f</span><span class="special">()</span><span class="special">
|
||||
{</span><span class="keyword">
|
||||
if</span><span class="special"> (</span><span class="identifier">override</span><span class="identifier"> f</span><span class="special"> =</span><span class="keyword"> this</span><span class="special">-></span><span class="identifier">get_override</span><span class="special">(</span><span class="string">"f"</span><span class="special">))</span><span class="keyword">
|
||||
return</span><span class="identifier"> f</span><span class="special">();</span><span class="comment"> // *note*
|
||||
</span><span class="keyword"> return</span><span class="identifier"> Base</span><span class="special">::</span><span class="identifier">f</span><span class="special">();</span><span class="special">
|
||||
}</span><span class="keyword">
|
||||
|
||||
int</span><span class="identifier"> default_f</span><span class="special">()</span><span class="special"> {</span><span class="keyword"> return</span><span class="keyword"> this</span><span class="special">-></span><span class="identifier">Base</span><span class="special">::</span><span class="identifier">f</span><span class="special">();</span><span class="special"> }</span><span class="special">
|
||||
};</span></tt></pre>
|
||||
<p>
|
||||
Notice how we implemented <tt class="computeroutput"><span class="identifier">BaseWrap</span><span class="special">::</span><span class="identifier">f</span></tt>. Now, we have to check if there is an
|
||||
override for <tt class="computeroutput"><span class="identifier">f</span></tt>. If none, then we call <tt class="computeroutput"><span class="identifier">Base</span><span class="special">::</span><span class="identifier">f</span><span class="special">()</span></tt>.</p>
|
||||
<div class="informaltable"><table class="table">
|
||||
<colgroup><col></colgroup>
|
||||
<tbody><tr><td>
|
||||
<span class="inlinemediaobject"><img src="../images/alert.png"></span> MSVC6/7 Workaround<p></p>
|
||||
<p></p>
|
||||
|
||||
If you are using Microsoft Visual C++ 6 or 7, you have to rewrite the line
|
||||
with the <tt class="computeroutput"><span class="special">*</span><span class="identifier">note</span><span class="special">*</span></tt> as:<p></p>
|
||||
<p></p>
|
||||
<tt class="computeroutput"><span class="keyword">return</span><span class="identifier"> call</span><span class="special"><</span><span class="keyword">char</span><span class="keyword"> const</span><span class="special">*>(</span><span class="identifier">f</span><span class="special">.</span><span class="identifier">ptr</span><span class="special">());</span></tt>.</td></tr></tbody>
|
||||
</table></div>
|
||||
<p>
|
||||
Finally, exposing:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">class_</span><span class="special"><</span><span class="identifier">BaseWrap</span><span class="special">,</span><span class="identifier"> boost</span><span class="special">::</span><span class="identifier">noncopyable</span><span class="special">>(</span><span class="string">"Base"</span><span class="special">)</span><span class="special">
|
||||
.</span><span class="identifier">def</span><span class="special">(</span><span class="string">"f"</span><span class="special">,</span><span class="special"> &</span><span class="identifier">Base</span><span class="special">::</span><span class="identifier">f</span><span class="special">,</span><span class="special"> &</span><span class="identifier">BaseWrap</span><span class="special">::</span><span class="identifier">default_f</span><span class="special">)</span><span class="special">
|
||||
;</span></tt></pre>
|
||||
<p>
|
||||
Take note that we expose both <tt class="computeroutput"><span class="special">&</span><span class="identifier">Base</span><span class="special">::</span><span class="identifier">f</span></tt> and <tt class="computeroutput"><span class="special">&</span><span class="identifier">BaseWrap</span><span class="special">::</span><span class="identifier">default_f</span></tt>.
|
||||
Boost.Python needs to keep track of 1) the dispatch function <tt class="literal">f</tt> and 2) the
|
||||
forwarding function to its default implementation <tt class="literal">default_f</tt>. There's a
|
||||
special <tt class="literal">def</tt> function for this purpose.</p>
|
||||
<p>
|
||||
In Python, the results would be as expected:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="special">>>></span><span class="identifier"> base</span><span class="special"> =</span><span class="identifier"> Base</span><span class="special">()</span><span class="special">
|
||||
>>></span><span class="keyword"> class</span><span class="identifier"> Derived</span><span class="special">(</span><span class="identifier">Base</span><span class="special">):</span><span class="special">
|
||||
...</span><span class="identifier"> def</span><span class="identifier"> f</span><span class="special">(</span><span class="identifier">self</span><span class="special">):</span><span class="special">
|
||||
...</span><span class="keyword"> return</span><span class="number"> 42</span><span class="special">
|
||||
...</span><span class="special">
|
||||
>>></span><span class="identifier"> derived</span><span class="special"> =</span><span class="identifier"> Derived</span><span class="special">()</span></tt></pre>
|
||||
<p>
|
||||
Calling <tt class="literal">base.f()</tt>:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="special">>>></span><span class="identifier"> base</span><span class="special">.</span><span class="identifier">f</span><span class="special">()</span><span class="number">
|
||||
0</span></tt></pre>
|
||||
<p>
|
||||
Calling <tt class="literal">derived.f()</tt>:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="special">>>></span><span class="identifier"> derived</span><span class="special">.</span><span class="identifier">f</span><span class="special">()</span><span class="number">
|
||||
42</span></tt></pre>
|
||||
</div>
|
||||
<div class="section" lang="en">
|
||||
<div class="titlepage"><div><div><h3 class="title">
|
||||
<a name="python.class_operators_special_functions"></a>Class Operators/Special Functions</h3></div></div></div>
|
||||
<a name="class_operators_special_functions.python_operators"></a><h2>
|
||||
<a name="id451830"></a>Python Operators</h2>
|
||||
<p>
|
||||
C is well known for the abundance of operators. C++ extends this to the
|
||||
extremes by allowing operator overloading. Boost.Python takes advantage of
|
||||
this and makes it easy to wrap C++ operator-powered classes.</p>
|
||||
<p>
|
||||
Consider a file position class <tt class="literal">FilePos</tt> and a set of operators that take
|
||||
on FilePos instances:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="keyword">class</span><span class="identifier"> FilePos</span><span class="special"> {</span><span class="comment"> /*...*/</span><span class="special"> };</span><span class="identifier">
|
||||
|
||||
FilePos</span><span class="keyword"> operator</span><span class="special">+(</span><span class="identifier">FilePos</span><span class="special">,</span><span class="keyword"> int</span><span class="special">);</span><span class="identifier">
|
||||
FilePos</span><span class="keyword"> operator</span><span class="special">+(</span><span class="keyword">int</span><span class="special">,</span><span class="identifier"> FilePos</span><span class="special">);</span><span class="keyword">
|
||||
int</span><span class="keyword"> operator</span><span class="special">-(</span><span class="identifier">FilePos</span><span class="special">,</span><span class="identifier"> FilePos</span><span class="special">);</span><span class="identifier">
|
||||
FilePos</span><span class="keyword"> operator</span><span class="special">-(</span><span class="identifier">FilePos</span><span class="special">,</span><span class="keyword"> int</span><span class="special">);</span><span class="identifier">
|
||||
FilePos</span><span class="special">&</span><span class="keyword"> operator</span><span class="special">+=(</span><span class="identifier">FilePos</span><span class="special">&,</span><span class="keyword"> int</span><span class="special">);</span><span class="identifier">
|
||||
FilePos</span><span class="special">&</span><span class="keyword"> operator</span><span class="special">-=(</span><span class="identifier">FilePos</span><span class="special">&,</span><span class="keyword"> int</span><span class="special">);</span><span class="keyword">
|
||||
bool</span><span class="keyword"> operator</span><span class="special"><(</span><span class="identifier">FilePos</span><span class="special">,</span><span class="identifier"> FilePos</span><span class="special">);</span></tt></pre>
|
||||
<p>
|
||||
The class and the various operators can be mapped to Python rather easily
|
||||
and intuitively:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">class_</span><span class="special"><</span><span class="identifier">FilePos</span><span class="special">>(</span><span class="string">"FilePos"</span><span class="special">)</span><span class="special">
|
||||
.</span><span class="identifier">def</span><span class="special">(</span><span class="identifier">self</span><span class="special"> +</span><span class="keyword"> int</span><span class="special">())</span><span class="comment"> // __add__
|
||||
</span><span class="special"> .</span><span class="identifier">def</span><span class="special">(</span><span class="keyword">int</span><span class="special">()</span><span class="special"> +</span><span class="identifier"> self</span><span class="special">)</span><span class="comment"> // __radd__
|
||||
</span><span class="special"> .</span><span class="identifier">def</span><span class="special">(</span><span class="identifier">self</span><span class="special"> -</span><span class="identifier"> self</span><span class="special">)</span><span class="comment"> // __sub__
|
||||
</span><span class="special"> .</span><span class="identifier">def</span><span class="special">(</span><span class="identifier">self</span><span class="special"> -</span><span class="keyword"> int</span><span class="special">())</span><span class="comment"> // __sub__
|
||||
</span><span class="special"> .</span><span class="identifier">def</span><span class="special">(</span><span class="identifier">self</span><span class="special"> +=</span><span class="keyword"> int</span><span class="special">())</span><span class="comment"> // __iadd__
|
||||
</span><span class="special"> .</span><span class="identifier">def</span><span class="special">(</span><span class="identifier">self</span><span class="special"> -=</span><span class="identifier"> other</span><span class="special"><</span><span class="keyword">int</span><span class="special">>())</span><span class="special">
|
||||
.</span><span class="identifier">def</span><span class="special">(</span><span class="identifier">self</span><span class="special"> <</span><span class="identifier"> self</span><span class="special">);</span><span class="comment"> // __lt__
|
||||
</span></tt></pre>
|
||||
<p>
|
||||
The code snippet above is very clear and needs almost no explanation at
|
||||
all. It is virtually the same as the operators' signatures. Just take
|
||||
note that <tt class="literal">self</tt> refers to FilePos object. Also, not every class <tt class="literal">T</tt> that
|
||||
you might need to interact with in an operator expression is (cheaply)
|
||||
default-constructible. You can use <tt class="literal">other<T>()</tt> in place of an actual
|
||||
<tt class="literal">T</tt> instance when writing "self expressions".</p>
|
||||
<a name="class_operators_special_functions.special_methods"></a><h2>
|
||||
<a name="id452516"></a>Special Methods</h2>
|
||||
<p>
|
||||
Python has a few more <span class="emphasis"><em>Special Methods</em></span>. Boost.Python supports all of the
|
||||
standard special method names supported by real Python class instances. A
|
||||
similar set of intuitive interfaces can also be used to wrap C++ functions
|
||||
that correspond to these Python <span class="emphasis"><em>special functions</em></span>. Example:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="keyword">class</span><span class="identifier"> Rational</span><span class="special">
|
||||
{</span><span class="keyword"> operator</span><span class="keyword"> double</span><span class="special">()</span><span class="keyword"> const</span><span class="special">;</span><span class="special"> };</span><span class="identifier">
|
||||
|
||||
Rational</span><span class="identifier"> pow</span><span class="special">(</span><span class="identifier">Rational</span><span class="special">,</span><span class="identifier"> Rational</span><span class="special">);</span><span class="identifier">
|
||||
Rational</span><span class="identifier"> abs</span><span class="special">(</span><span class="identifier">Rational</span><span class="special">);</span><span class="identifier">
|
||||
ostream</span><span class="special">&</span><span class="keyword"> operator</span><span class="special"><<(</span><span class="identifier">ostream</span><span class="special">&,</span><span class="identifier">Rational</span><span class="special">);</span><span class="identifier">
|
||||
|
||||
class_</span><span class="special"><</span><span class="identifier">Rational</span><span class="special">>()</span><span class="special">
|
||||
.</span><span class="identifier">def</span><span class="special">(</span><span class="identifier">float_</span><span class="special">(</span><span class="identifier">self</span><span class="special">))</span><span class="comment"> // __float__
|
||||
</span><span class="special"> .</span><span class="identifier">def</span><span class="special">(</span><span class="identifier">pow</span><span class="special">(</span><span class="identifier">self</span><span class="special">,</span><span class="identifier"> other</span><span class="special"><</span><span class="identifier">Rational</span><span class="special">>))</span><span class="comment"> // __pow__
|
||||
</span><span class="special"> .</span><span class="identifier">def</span><span class="special">(</span><span class="identifier">abs</span><span class="special">(</span><span class="identifier">self</span><span class="special">))</span><span class="comment"> // __abs__
|
||||
</span><span class="special"> .</span><span class="identifier">def</span><span class="special">(</span><span class="identifier">str</span><span class="special">(</span><span class="identifier">self</span><span class="special">))</span><span class="comment"> // __str__
|
||||
</span><span class="special"> ;</span></tt></pre>
|
||||
<p>
|
||||
Need we say more?</p>
|
||||
<div class="informaltable"><table class="table">
|
||||
<colgroup><col></colgroup>
|
||||
<tbody><tr><td>
|
||||
<span class="inlinemediaobject"><img src="../images/note.png"></span> What is the business of <tt class="literal">operator<<</tt><tt class="literal">.def(str(self))</tt>?
|
||||
Well, the method <tt class="literal">str</tt> requires the <tt class="literal">operator<<</tt> to do its work (i.e.
|
||||
<tt class="literal">operator<<</tt> is used by the method defined by def(str(self)).</td></tr></tbody>
|
||||
</table></div>
|
||||
</div>
|
||||
</div>
|
||||
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
|
||||
<td align="left"></td>
|
||||
<td align="right"><small>Copyright © 2002-2004 Joel de Guzman, David Abrahams</small></td>
|
||||
</tr></table>
|
||||
<hr>
|
||||
<div class="spirit-nav">
|
||||
<a accesskey="p" href="hello.html"><img src="../images/prev.png" alt="Prev"></a><a accesskey="u" href="../index.html"><img src="../images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="functions.html"><img src="../images/next.png" alt="Next"></a>
|
||||
</div>
|
||||
</body>
|
||||
</html>
|
||||
479
doc/tutorial/doc/html/python/functions.html
Normal file
@@ -0,0 +1,479 @@
|
||||
<html>
|
||||
<head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>Functions</title>
|
||||
<link rel="stylesheet" href="../boostbook.css" type="text/css">
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<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
|
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<link rel="start" href="../index.html" title="Chapter 1. python 1.0">
|
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<link rel="up" href="../index.html" title="Chapter 1. python 1.0">
|
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<link rel="prev" href="exposing.html" title=" Exposing Classes">
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<link rel="next" href="object.html" title=" Object Interface">
|
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</head>
|
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
|
||||
<table cellpadding="2" width="100%">
|
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<td valign="top"><img alt="boost.png (6897 bytes)" width="277" height="86" src="../../../../../../../boost.png"></td>
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<td align="center"><a href="../../../../../../../index.htm">Home</a></td>
|
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<td align="center"><a href="../../../../../../libraries.htm">Libraries</a></td>
|
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<td align="center"><a href="../../../../../../../people/people.htm">People</a></td>
|
||||
<td align="center"><a href="../../../../../../../more/faq.htm">FAQ</a></td>
|
||||
<td align="center"><a href="../../../../../../../more/index.htm">More</a></td>
|
||||
</table>
|
||||
<hr>
|
||||
<div class="spirit-nav">
|
||||
<a accesskey="p" href="exposing.html"><img src="../images/prev.png" alt="Prev"></a><a accesskey="u" href="../index.html"><img src="../images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="object.html"><img src="../images/next.png" alt="Next"></a>
|
||||
</div>
|
||||
<div class="section" lang="en">
|
||||
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
|
||||
<a name="python.functions"></a>Functions</h2></div></div></div>
|
||||
<div class="toc"><dl>
|
||||
<dt><span class="section"><a href="functions.html#python.call_policies">Call Policies</a></span></dt>
|
||||
<dt><span class="section"><a href="functions.html#python.overloading">Overloading</a></span></dt>
|
||||
<dt><span class="section"><a href="functions.html#python.default_arguments">Default Arguments</a></span></dt>
|
||||
<dt><span class="section"><a href="functions.html#python.auto_overloading">Auto-Overloading</a></span></dt>
|
||||
</dl></div>
|
||||
<p>
|
||||
In this chapter, we'll look at Boost.Python powered functions in closer
|
||||
detail. We shall see some facilities to make exposing C++ functions to
|
||||
Python safe from potential pifalls such as dangling pointers and
|
||||
references. We shall also see facilities that will make it even easier for
|
||||
us to expose C++ functions that take advantage of C++ features such as
|
||||
overloading and default arguments.</p>
|
||||
<div class="blockquote"><blockquote class="blockquote"><p><span class="emphasis"><em>Read on...</em></span></p></blockquote></div>
|
||||
<p>
|
||||
But before you do, you might want to fire up Python 2.2 or later and type
|
||||
<tt class="literal">>>> import this</tt>.</p>
|
||||
<pre class="programlisting"><tt class="literal"> >>> import this
|
||||
The Zen of Python, by Tim Peters
|
||||
Beautiful is better than ugly.
|
||||
Explicit is better than implicit.
|
||||
Simple is better than complex.
|
||||
Complex is better than complicated.
|
||||
Flat is better than nested.
|
||||
Sparse is better than dense.
|
||||
Readability counts.
|
||||
Special cases aren't special enough to break the rules.
|
||||
Although practicality beats purity.
|
||||
Errors should never pass silently.
|
||||
Unless explicitly silenced.
|
||||
In the face of ambiguity, refuse the temptation to guess.
|
||||
There should be one-- and preferably only one --obvious way to do it
|
||||
Although that way may not be obvious at first unless you're Dutch.
|
||||
Now is better than never.
|
||||
Although never is often better than <span class="bold"><b>right</b></span> now.
|
||||
If the implementation is hard to explain, it's a bad idea.
|
||||
If the implementation is easy to explain, it may be a good idea.
|
||||
Namespaces are one honking great idea -- let's do more of those!
|
||||
</tt></pre>
|
||||
<div class="section" lang="en">
|
||||
<div class="titlepage"><div><div><h3 class="title">
|
||||
<a name="python.call_policies"></a>Call Policies</h3></div></div></div>
|
||||
<p>
|
||||
In C++, we often deal with arguments and return types such as pointers
|
||||
and references. Such primitive types are rather, ummmm, low level and
|
||||
they really don't tell us much. At the very least, we don't know the
|
||||
owner of the pointer or the referenced object. No wonder languages
|
||||
such as Java and Python never deal with such low level entities. In
|
||||
C++, it's usually considered a good practice to use smart pointers
|
||||
which exactly describe ownership semantics. Still, even good C++
|
||||
interfaces use raw references and pointers sometimes, so Boost.Python
|
||||
must deal with them. To do this, it may need your help. Consider the
|
||||
following C++ function:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">X</span><span class="special">&</span><span class="identifier"> f</span><span class="special">(</span><span class="identifier">Y</span><span class="special">&</span><span class="identifier"> y</span><span class="special">,</span><span class="identifier"> Z</span><span class="special">*</span><span class="identifier"> z</span><span class="special">);</span></tt></pre>
|
||||
<p>
|
||||
How should the library wrap this function? A naive approach builds a
|
||||
Python X object around result reference. This strategy might or might
|
||||
not work out. Here's an example where it didn't</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="special">>>></span><span class="identifier"> x</span><span class="special"> =</span><span class="identifier"> f</span><span class="special">(</span><span class="identifier">y</span><span class="special">,</span><span class="identifier"> z</span><span class="special">)</span> #<span class="identifier"> x</span><span class="identifier"> refers</span><span class="identifier"> to</span><span class="identifier"> some</span><span class="identifier"> C</span><span class="special">++</span><span class="identifier"> X</span><span class="special">
|
||||
>>></span><span class="identifier"> del</span><span class="identifier"> y</span><span class="special">
|
||||
>>></span><span class="identifier"> x</span><span class="special">.</span><span class="identifier">some_method</span><span class="special">()</span> #<span class="identifier"> CRASH</span><span class="special">!</span></tt></pre>
|
||||
<p>
|
||||
What's the problem?</p>
|
||||
<p>
|
||||
Well, what if f() was implemented as shown below:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">X</span><span class="special">&</span><span class="identifier"> f</span><span class="special">(</span><span class="identifier">Y</span><span class="special">&</span><span class="identifier"> y</span><span class="special">,</span><span class="identifier"> Z</span><span class="special">*</span><span class="identifier"> z</span><span class="special">)</span><span class="special">
|
||||
{</span><span class="identifier">
|
||||
y</span><span class="special">.</span><span class="identifier">z</span><span class="special"> =</span><span class="identifier"> z</span><span class="special">;</span><span class="keyword">
|
||||
return</span><span class="identifier"> y</span><span class="special">.</span><span class="identifier">x</span><span class="special">;</span><span class="special">
|
||||
}</span></tt></pre>
|
||||
<p>
|
||||
The problem is that the lifetime of result X& is tied to the lifetime
|
||||
of y, because the f() returns a reference to a member of the y
|
||||
object. This idiom is is not uncommon and perfectly acceptable in the
|
||||
context of C++. However, Python users should not be able to crash the
|
||||
system just by using our C++ interface. In this case deleting y will
|
||||
invalidate the reference to X. We have a dangling reference.</p>
|
||||
<p>
|
||||
Here's what's happening:</p>
|
||||
<div class="orderedlist"><ol type="1">
|
||||
<li>
|
||||
<tt class="literal">f</tt> is called passing in a reference to <tt class="literal">y</tt> and a pointer to <tt class="literal">z</tt>
|
||||
</li>
|
||||
<li>
|
||||
A reference to <tt class="literal">y.x</tt> is returned
|
||||
</li>
|
||||
<li>
|
||||
<tt class="literal">y</tt> is deleted. <tt class="literal">x</tt> is a dangling reference
|
||||
</li>
|
||||
<li>
|
||||
<tt class="literal">x.some_method()</tt> is called
|
||||
</li>
|
||||
<li><span class="bold"><b>BOOM!</b></span></li>
|
||||
</ol></div>
|
||||
<p>
|
||||
We could copy result into a new object:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="special">>>></span><span class="identifier"> f</span><span class="special">(</span><span class="identifier">y</span><span class="special">,</span><span class="identifier"> z</span><span class="special">).</span><span class="identifier">set</span><span class="special">(</span><span class="number">42</span><span class="special">)</span> #<span class="identifier"> Result</span><span class="identifier"> disappears</span><span class="special">
|
||||
>>></span><span class="identifier"> y</span><span class="special">.</span><span class="identifier">x</span><span class="special">.</span><span class="identifier">get</span><span class="special">()</span> #<span class="identifier"> No</span><span class="identifier"> crash</span><span class="special">,</span><span class="identifier"> but</span><span class="identifier"> still</span><span class="identifier"> bad</span><span class="number">
|
||||
3.14</span></tt></pre>
|
||||
<p>
|
||||
This is not really our intent of our C++ interface. We've broken our
|
||||
promise that the Python interface should reflect the C++ interface as
|
||||
closely as possible.</p>
|
||||
<p>
|
||||
Our problems do not end there. Suppose Y is implemented as follows:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="keyword">struct</span><span class="identifier"> Y</span><span class="special">
|
||||
{</span><span class="identifier">
|
||||
X</span><span class="identifier"> x</span><span class="special">;</span><span class="identifier"> Z</span><span class="special">*</span><span class="identifier"> z</span><span class="special">;</span><span class="keyword">
|
||||
int</span><span class="identifier"> z_value</span><span class="special">()</span><span class="special"> {</span><span class="keyword"> return</span><span class="identifier"> z</span><span class="special">-></span><span class="identifier">value</span><span class="special">();</span><span class="special"> }</span><span class="special">
|
||||
};</span></tt></pre>
|
||||
<p>
|
||||
Notice that the data member <tt class="literal">z</tt> is held by class Y using a raw
|
||||
pointer. Now we have a potential dangling pointer problem inside Y:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="special">>>></span><span class="identifier"> x</span><span class="special"> =</span><span class="identifier"> f</span><span class="special">(</span><span class="identifier">y</span><span class="special">,</span><span class="identifier"> z</span><span class="special">)</span> #<span class="identifier"> y</span><span class="identifier"> refers</span><span class="identifier"> to</span><span class="identifier"> z</span><span class="special">
|
||||
>>></span><span class="identifier"> del</span><span class="identifier"> z</span> #<span class="identifier"> Kill</span><span class="identifier"> the</span><span class="identifier"> z</span><span class="identifier"> object</span><span class="special">
|
||||
>>></span><span class="identifier"> y</span><span class="special">.</span><span class="identifier">z_value</span><span class="special">()</span> #<span class="identifier"> CRASH</span><span class="special">!</span></tt></pre>
|
||||
<p>
|
||||
For reference, here's the implementation of <tt class="literal">f</tt> again:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">X</span><span class="special">&</span><span class="identifier"> f</span><span class="special">(</span><span class="identifier">Y</span><span class="special">&</span><span class="identifier"> y</span><span class="special">,</span><span class="identifier"> Z</span><span class="special">*</span><span class="identifier"> z</span><span class="special">)</span><span class="special">
|
||||
{</span><span class="identifier">
|
||||
y</span><span class="special">.</span><span class="identifier">z</span><span class="special"> =</span><span class="identifier"> z</span><span class="special">;</span><span class="keyword">
|
||||
return</span><span class="identifier"> y</span><span class="special">.</span><span class="identifier">x</span><span class="special">;</span><span class="special">
|
||||
}</span></tt></pre>
|
||||
<p>
|
||||
Here's what's happening:</p>
|
||||
<div class="orderedlist"><ol type="1">
|
||||
<li>
|
||||
<tt class="literal">f</tt> is called passing in a reference to <tt class="literal">y</tt> and a pointer to <tt class="literal">z</tt>
|
||||
</li>
|
||||
<li>
|
||||
A pointer to <tt class="literal">z</tt> is held by <tt class="literal">y</tt>
|
||||
</li>
|
||||
<li>
|
||||
A reference to <tt class="literal">y.x</tt> is returned
|
||||
</li>
|
||||
<li>
|
||||
<tt class="literal">z</tt> is deleted. <tt class="literal">y.z</tt> is a dangling pointer
|
||||
</li>
|
||||
<li>
|
||||
<tt class="literal">y.z_value()</tt> is called
|
||||
</li>
|
||||
<li>
|
||||
<tt class="literal">z->value()</tt> is called
|
||||
</li>
|
||||
<li><span class="bold"><b>BOOM!</b></span></li>
|
||||
</ol></div>
|
||||
<a name="call_policies.call_policies"></a><h2>
|
||||
<a name="id454162"></a>Call Policies</h2>
|
||||
<p>
|
||||
Call Policies may be used in situations such as the example detailed above.
|
||||
In our example, <tt class="literal">return_internal_reference</tt> and <tt class="literal">with_custodian_and_ward</tt>
|
||||
are our friends:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">def</span><span class="special">(</span><span class="string">"f"</span><span class="special">,</span><span class="identifier"> f</span><span class="special">,</span><span class="identifier">
|
||||
return_internal_reference</span><span class="special"><</span><span class="number">1</span><span class="special">,</span><span class="identifier">
|
||||
with_custodian_and_ward</span><span class="special"><</span><span class="number">1</span><span class="special">,</span><span class="number"> 2</span><span class="special">></span><span class="special"> >());</span></tt></pre>
|
||||
<p>
|
||||
What are the <tt class="literal">1</tt> and <tt class="literal">2</tt> parameters, you ask?</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">return_internal_reference</span><span class="special"><</span><span class="number">1</span></tt></pre>
|
||||
<p>
|
||||
Informs Boost.Python that the first argument, in our case <tt class="literal">Y& y</tt>, is the
|
||||
owner of the returned reference: <tt class="literal">X&</tt>. The "<tt class="literal">1</tt>" simply specifies the
|
||||
first argument. In short: "return an internal reference <tt class="literal">X&</tt> owned by the
|
||||
1st argument <tt class="literal">Y& y</tt>".</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">with_custodian_and_ward</span><span class="special"><</span><span class="number">1</span><span class="special">,</span><span class="number"> 2</span><span class="special">></span></tt></pre>
|
||||
<p>
|
||||
Informs Boost.Python that the lifetime of the argument indicated by ward
|
||||
(i.e. the 2nd argument: <tt class="literal">Z* z</tt>) is dependent on the lifetime of the
|
||||
argument indicated by custodian (i.e. the 1st argument: <tt class="literal">Y& y</tt>).</p>
|
||||
<p>
|
||||
It is also important to note that we have defined two policies above. Two
|
||||
or more policies can be composed by chaining. Here's the general syntax:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">policy1</span><span class="special"><</span><span class="identifier">args</span><span class="special">...,</span><span class="identifier">
|
||||
policy2</span><span class="special"><</span><span class="identifier">args</span><span class="special">...,</span><span class="identifier">
|
||||
policy3</span><span class="special"><</span><span class="identifier">args</span><span class="special">...></span><span class="special"> ></span><span class="special"> ></span></tt></pre>
|
||||
<p>
|
||||
Here is the list of predefined call policies. A complete reference detailing
|
||||
these can be found <a href="../../../../v2/reference.html#models_of_call_policies" target="_top">here</a>.</p>
|
||||
<div class="itemizedlist"><ul type="disc">
|
||||
<li>
|
||||
<span class="bold"><b>with_custodian_and_ward</b></span><p></p>
|
||||
Ties lifetimes of the arguments
|
||||
</li>
|
||||
<li>
|
||||
<span class="bold"><b>with_custodian_and_ward_postcall</b></span><p></p>
|
||||
Ties lifetimes of the arguments and results
|
||||
</li>
|
||||
<li>
|
||||
<span class="bold"><b>return_internal_reference</b></span><p></p>
|
||||
Ties lifetime of one argument to that of result
|
||||
</li>
|
||||
<li>
|
||||
<span class="bold"><b>return_value_policy<T> with T one of:</b></span><p></p>
|
||||
</li>
|
||||
<li>
|
||||
<span class="bold"><b>reference_existing_object</b></span><p></p>
|
||||
naive (dangerous) approach
|
||||
</li>
|
||||
<li>
|
||||
<span class="bold"><b>copy_const_reference</b></span><p></p>
|
||||
Boost.Python v1 approach
|
||||
</li>
|
||||
<li>
|
||||
<span class="bold"><b>copy_non_const_reference</b></span><p></p>
|
||||
</li>
|
||||
<li>
|
||||
<span class="bold"><b>manage_new_object</b></span><p></p>
|
||||
Adopt a pointer and hold the instance
|
||||
</li>
|
||||
</ul></div>
|
||||
<div class="informaltable"><table class="table">
|
||||
<colgroup><col></colgroup>
|
||||
<tbody><tr><td>
|
||||
<span class="inlinemediaobject"><img src="../images/smiley.png"></span><span class="bold"><b>Remember the Zen, Luke:</b></span><p></p>
|
||||
<p></p>
|
||||
|
||||
"Explicit is better than implicit"<p></p>
|
||||
|
||||
"In the face of ambiguity, refuse the temptation to guess"<p></p>
|
||||
</td></tr></tbody>
|
||||
</table></div>
|
||||
</div>
|
||||
<div class="section" lang="en">
|
||||
<div class="titlepage"><div><div><h3 class="title">
|
||||
<a name="python.overloading"></a>Overloading</h3></div></div></div>
|
||||
<p>
|
||||
The following illustrates a scheme for manually wrapping an overloaded
|
||||
member functions. Of course, the same technique can be applied to wrapping
|
||||
overloaded non-member functions.</p>
|
||||
<p>
|
||||
We have here our C++ class:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="keyword">struct</span><span class="identifier"> X</span><span class="special">
|
||||
{</span><span class="keyword">
|
||||
bool</span><span class="identifier"> f</span><span class="special">(</span><span class="keyword">int</span><span class="identifier"> a</span><span class="special">)</span><span class="special">
|
||||
{</span><span class="keyword">
|
||||
return</span><span class="keyword"> true</span><span class="special">;</span><span class="special">
|
||||
}</span><span class="keyword">
|
||||
|
||||
bool</span><span class="identifier"> f</span><span class="special">(</span><span class="keyword">int</span><span class="identifier"> a</span><span class="special">,</span><span class="keyword"> double</span><span class="identifier"> b</span><span class="special">)</span><span class="special">
|
||||
{</span><span class="keyword">
|
||||
return</span><span class="keyword"> true</span><span class="special">;</span><span class="special">
|
||||
}</span><span class="keyword">
|
||||
|
||||
bool</span><span class="identifier"> f</span><span class="special">(</span><span class="keyword">int</span><span class="identifier"> a</span><span class="special">,</span><span class="keyword"> double</span><span class="identifier"> b</span><span class="special">,</span><span class="keyword"> char</span><span class="identifier"> c</span><span class="special">)</span><span class="special">
|
||||
{</span><span class="keyword">
|
||||
return</span><span class="keyword"> true</span><span class="special">;</span><span class="special">
|
||||
}</span><span class="keyword">
|
||||
|
||||
int</span><span class="identifier"> f</span><span class="special">(</span><span class="keyword">int</span><span class="identifier"> a</span><span class="special">,</span><span class="keyword"> int</span><span class="identifier"> b</span><span class="special">,</span><span class="keyword"> int</span><span class="identifier"> c</span><span class="special">)</span><span class="special">
|
||||
{</span><span class="keyword">
|
||||
return</span><span class="identifier"> a</span><span class="special"> +</span><span class="identifier"> b</span><span class="special"> +</span><span class="identifier"> c</span><span class="special">;</span><span class="special">
|
||||
};</span><span class="special">
|
||||
};</span></tt></pre>
|
||||
<p>
|
||||
Class X has 4 overloaded functions. We shall start by introducing some
|
||||
member function pointer variables:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="keyword">bool</span><span class="special"> (</span><span class="identifier">X</span><span class="special">::*</span><span class="identifier">fx1</span><span class="special">)(</span><span class="keyword">int</span><span class="special">)</span><span class="special"> =</span><span class="special"> &</span><span class="identifier">X</span><span class="special">::</span><span class="identifier">f</span><span class="special">;</span><span class="keyword">
|
||||
bool</span><span class="special"> (</span><span class="identifier">X</span><span class="special">::*</span><span class="identifier">fx2</span><span class="special">)(</span><span class="keyword">int</span><span class="special">,</span><span class="keyword"> double</span><span class="special">)</span><span class="special"> =</span><span class="special"> &</span><span class="identifier">X</span><span class="special">::</span><span class="identifier">f</span><span class="special">;</span><span class="keyword">
|
||||
bool</span><span class="special"> (</span><span class="identifier">X</span><span class="special">::*</span><span class="identifier">fx3</span><span class="special">)(</span><span class="keyword">int</span><span class="special">,</span><span class="keyword"> double</span><span class="special">,</span><span class="keyword"> char</span><span class="special">)=</span><span class="special"> &</span><span class="identifier">X</span><span class="special">::</span><span class="identifier">f</span><span class="special">;</span><span class="keyword">
|
||||
int</span><span class="special"> (</span><span class="identifier">X</span><span class="special">::*</span><span class="identifier">fx4</span><span class="special">)(</span><span class="keyword">int</span><span class="special">,</span><span class="keyword"> int</span><span class="special">,</span><span class="keyword"> int</span><span class="special">)</span><span class="special"> =</span><span class="special"> &</span><span class="identifier">X</span><span class="special">::</span><span class="identifier">f</span><span class="special">;</span></tt></pre>
|
||||
<p>
|
||||
With these in hand, we can proceed to define and wrap this for Python:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="special">.</span><span class="identifier">def</span><span class="special">(</span><span class="string">"f"</span><span class="special">,</span><span class="identifier"> fx1</span><span class="special">)</span><span class="special">
|
||||
.</span><span class="identifier">def</span><span class="special">(</span><span class="string">"f"</span><span class="special">,</span><span class="identifier"> fx2</span><span class="special">)</span><span class="special">
|
||||
.</span><span class="identifier">def</span><span class="special">(</span><span class="string">"f"</span><span class="special">,</span><span class="identifier"> fx3</span><span class="special">)</span><span class="special">
|
||||
.</span><span class="identifier">def</span><span class="special">(</span><span class="string">"f"</span><span class="special">,</span><span class="identifier"> fx4</span><span class="special">)</span></tt></pre>
|
||||
</div>
|
||||
<div class="section" lang="en">
|
||||
<div class="titlepage"><div><div><h3 class="title">
|
||||
<a name="python.default_arguments"></a>Default Arguments</h3></div></div></div>
|
||||
<p>
|
||||
Boost.Python wraps (member) function pointers. Unfortunately, C++ function
|
||||
pointers carry no default argument info. Take a function <tt class="literal">f</tt> with default
|
||||
arguments:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="keyword">int</span><span class="identifier"> f</span><span class="special">(</span><span class="keyword">int</span><span class="special">,</span><span class="keyword"> double</span><span class="special"> =</span><span class="number"> 3.14</span><span class="special">,</span><span class="keyword"> char</span><span class="keyword"> const</span><span class="special">*</span><span class="special"> =</span><span class="string"> "hello"</span><span class="special">);</span></tt></pre>
|
||||
<p>
|
||||
But the type of a pointer to the function <tt class="literal">f</tt> has no information
|
||||
about its default arguments:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="keyword">int</span><span class="special">(*</span><span class="identifier">g</span><span class="special">)(</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">double</span><span class="special">,</span><span class="keyword">char</span><span class="keyword"> const</span><span class="special">*)</span><span class="special"> =</span><span class="identifier"> f</span><span class="special">;</span><span class="comment"> // defaults lost!
|
||||
</span></tt></pre>
|
||||
<p>
|
||||
When we pass this function pointer to the <tt class="literal">def</tt> function, there is no way
|
||||
to retrieve the default arguments:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">def</span><span class="special">(</span><span class="string">"f"</span><span class="special">,</span><span class="identifier"> f</span><span class="special">);</span><span class="comment"> // defaults lost!
|
||||
</span></tt></pre>
|
||||
<p>
|
||||
Because of this, when wrapping C++ code, we had to resort to manual
|
||||
wrapping as outlined in the <a href="functions.html#python.overloading" title="Overloading">previous section</a>, or
|
||||
writing thin wrappers:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="comment">// write "thin wrappers"
|
||||
</span><span class="keyword">int</span><span class="identifier"> f1</span><span class="special">(</span><span class="keyword">int</span><span class="identifier"> x</span><span class="special">)</span><span class="special"> {</span><span class="identifier"> f</span><span class="special">(</span><span class="identifier">x</span><span class="special">);</span><span class="special"> }</span><span class="keyword">
|
||||
int</span><span class="identifier"> f2</span><span class="special">(</span><span class="keyword">int</span><span class="identifier"> x</span><span class="special">,</span><span class="keyword"> double</span><span class="identifier"> y</span><span class="special">)</span><span class="special"> {</span><span class="identifier"> f</span><span class="special">(</span><span class="identifier">x</span><span class="special">,</span><span class="identifier">y</span><span class="special">);</span><span class="special"> }</span><span class="comment">
|
||||
|
||||
/*...*/
|
||||
|
||||
// in module init
|
||||
</span><span class="identifier"> def</span><span class="special">(</span><span class="string">"f"</span><span class="special">,</span><span class="identifier"> f</span><span class="special">);</span><span class="comment"> // all arguments
|
||||
</span><span class="identifier"> def</span><span class="special">(</span><span class="string">"f"</span><span class="special">,</span><span class="identifier"> f2</span><span class="special">);</span><span class="comment"> // two arguments
|
||||
</span><span class="identifier"> def</span><span class="special">(</span><span class="string">"f"</span><span class="special">,</span><span class="identifier"> f1</span><span class="special">);</span><span class="comment"> // one argument
|
||||
</span></tt></pre>
|
||||
<p>
|
||||
When you want to wrap functions (or member functions) that either:</p>
|
||||
<div class="itemizedlist"><ul type="disc">
|
||||
<li>
|
||||
have default arguments, or
|
||||
</li>
|
||||
<li>
|
||||
are overloaded with a common sequence of initial arguments
|
||||
</li>
|
||||
</ul></div>
|
||||
<a name="default_arguments.boost_python_function_overloads"></a><h2>
|
||||
<a name="id455979"></a>BOOST_PYTHON_FUNCTION_OVERLOADS</h2>
|
||||
<p>
|
||||
Boost.Python now has a way to make it easier. For instance, given a function:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="keyword">int</span><span class="identifier"> foo</span><span class="special">(</span><span class="keyword">int</span><span class="identifier"> a</span><span class="special">,</span><span class="keyword"> char</span><span class="identifier"> b</span><span class="special"> =</span><span class="number"> 1</span><span class="special">,</span><span class="keyword"> unsigned</span><span class="identifier"> c</span><span class="special"> =</span><span class="number"> 2</span><span class="special">,</span><span class="keyword"> double</span><span class="identifier"> d</span><span class="special"> =</span><span class="number"> 3</span><span class="special">)</span><span class="special">
|
||||
{</span><span class="comment">
|
||||
/*...*/</span><span class="special">
|
||||
}</span></tt></pre>
|
||||
<p>
|
||||
The macro invocation:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">BOOST_PYTHON_FUNCTION_OVERLOADS</span><span class="special">(</span><span class="identifier">foo_overloads</span><span class="special">,</span><span class="identifier"> foo</span><span class="special">,</span><span class="number"> 1</span><span class="special">,</span><span class="number"> 4</span><span class="special">)</span></tt></pre>
|
||||
<p>
|
||||
will automatically create the thin wrappers for us. This macro will create
|
||||
a class <tt class="literal">foo_overloads</tt> that can be passed on to <tt class="literal">def(...)</tt>. The third
|
||||
and fourth macro argument are the minimum arguments and maximum arguments,
|
||||
respectively. In our <tt class="literal">foo</tt> function the minimum number of arguments is 1
|
||||
and the maximum number of arguments is 4. The <tt class="literal">def(...)</tt> function will
|
||||
automatically add all the foo variants for us:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">def</span><span class="special">(</span><span class="string">"foo"</span><span class="special">,</span><span class="identifier"> foo</span><span class="special">,</span><span class="identifier"> foo_overloads</span><span class="special">());</span></tt></pre>
|
||||
<a name="default_arguments.boost_python_member_function_overloads"></a><h2>
|
||||
<a name="id456259"></a>BOOST_PYTHON_MEMBER_FUNCTION_OVERLOADS</h2>
|
||||
<p>
|
||||
Objects here, objects there, objects here there everywhere. More frequently
|
||||
than anything else, we need to expose member functions of our classes to
|
||||
Python. Then again, we have the same inconveniences as before when default
|
||||
arguments or overloads with a common sequence of initial arguments come
|
||||
into play. Another macro is provided to make this a breeze.</p>
|
||||
<p>
|
||||
Like <tt class="literal">BOOST_PYTHON_FUNCTION_OVERLOADS</tt>,
|
||||
<tt class="literal">BOOST_PYTHON_MEMBER_FUNCTION_OVERLOADS</tt> may be used to automatically create
|
||||
the thin wrappers for wrapping member functions. Let's have an example:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="keyword">struct</span><span class="identifier"> george</span><span class="special">
|
||||
{</span><span class="keyword">
|
||||
void</span><span class="identifier">
|
||||
wack_em</span><span class="special">(</span><span class="keyword">int</span><span class="identifier"> a</span><span class="special">,</span><span class="keyword"> int</span><span class="identifier"> b</span><span class="special"> =</span><span class="number"> 0</span><span class="special">,</span><span class="keyword"> char</span><span class="identifier"> c</span><span class="special"> =</span><span class="char"> 'x'</span><span class="special">)</span><span class="special">
|
||||
{</span><span class="comment">
|
||||
/*...*/</span><span class="special">
|
||||
}</span><span class="special">
|
||||
};</span></tt></pre>
|
||||
<p>
|
||||
The macro invocation:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">BOOST_PYTHON_MEMBER_FUNCTION_OVERLOADS</span><span class="special">(</span><span class="identifier">george_overloads</span><span class="special">,</span><span class="identifier"> wack_em</span><span class="special">,</span><span class="number"> 1</span><span class="special">,</span><span class="number"> 3</span><span class="special">)</span></tt></pre>
|
||||
<p>
|
||||
will generate a set of thin wrappers for george's <tt class="literal">wack_em</tt> member function
|
||||
accepting a minimum of 1 and a maximum of 3 arguments (i.e. the third and
|
||||
fourth macro argument). The thin wrappers are all enclosed in a class named
|
||||
<tt class="literal">george_overloads</tt> that can then be used as an argument to <tt class="literal">def(...)</tt>:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="special">.</span><span class="identifier">def</span><span class="special">(</span><span class="string">"wack_em"</span><span class="special">,</span><span class="special"> &</span><span class="identifier">george</span><span class="special">::</span><span class="identifier">wack_em</span><span class="special">,</span><span class="identifier"> george_overloads</span><span class="special">());</span></tt></pre>
|
||||
<p>
|
||||
See the <a href="../../../../v2/overloads.html#BOOST_PYTHON_FUNCTION_OVERLOADS-spec" target="_top">overloads reference</a>
|
||||
for details.</p>
|
||||
<a name="default_arguments.init_and_optional"></a><h2>
|
||||
<a name="id456586"></a>init and optional</h2>
|
||||
<p>
|
||||
A similar facility is provided for class constructors, again, with
|
||||
default arguments or a sequence of overloads. Remember <tt class="literal">init<...></tt>? For example,
|
||||
given a class X with a constructor:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="keyword">struct</span><span class="identifier"> X</span><span class="special">
|
||||
{</span><span class="identifier">
|
||||
X</span><span class="special">(</span><span class="keyword">int</span><span class="identifier"> a</span><span class="special">,</span><span class="keyword"> char</span><span class="identifier"> b</span><span class="special"> =</span><span class="char"> 'D'</span><span class="special">,</span><span class="identifier"> std</span><span class="special">::</span><span class="identifier">string</span><span class="identifier"> c</span><span class="special"> =</span><span class="string"> "constructor"</span><span class="special">,</span><span class="keyword"> double</span><span class="identifier"> d</span><span class="special"> =</span><span class="number"> 0.0</span><span class="special">);</span><span class="comment">
|
||||
/*...*/</span><span class="special">
|
||||
}</span></tt></pre>
|
||||
<p>
|
||||
You can easily add this constructor to Boost.Python in one shot:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="special">.</span><span class="identifier">def</span><span class="special">(</span><span class="identifier">init</span><span class="special"><</span><span class="keyword">int</span><span class="special">,</span><span class="identifier"> optional</span><span class="special"><</span><span class="keyword">char</span><span class="special">,</span><span class="identifier"> std</span><span class="special">::</span><span class="identifier">string</span><span class="special">,</span><span class="keyword"> double</span><span class="special">></span><span class="special"> >())</span></tt></pre>
|
||||
<p>
|
||||
Notice the use of <tt class="literal">init<...></tt> and <tt class="literal">optional<...></tt> to signify the default
|
||||
(optional arguments).</p>
|
||||
</div>
|
||||
<div class="section" lang="en">
|
||||
<div class="titlepage"><div><div><h3 class="title">
|
||||
<a name="python.auto_overloading"></a>Auto-Overloading</h3></div></div></div>
|
||||
<p>
|
||||
It was mentioned in passing in the previous section that
|
||||
<tt class="literal">BOOST_PYTHON_FUNCTION_OVERLOADS</tt> and <tt class="literal">BOOST_PYTHON_MEMBER_FUNCTION_OVERLOADS</tt>
|
||||
can also be used for overloaded functions and member functions with a
|
||||
common sequence of initial arguments. Here is an example:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="keyword">void</span><span class="identifier"> foo</span><span class="special">()</span><span class="special">
|
||||
{</span><span class="comment">
|
||||
/*...*/</span><span class="special">
|
||||
}</span><span class="keyword">
|
||||
|
||||
void</span><span class="identifier"> foo</span><span class="special">(</span><span class="keyword">bool</span><span class="identifier"> a</span><span class="special">)</span><span class="special">
|
||||
{</span><span class="comment">
|
||||
/*...*/</span><span class="special">
|
||||
}</span><span class="keyword">
|
||||
|
||||
void</span><span class="identifier"> foo</span><span class="special">(</span><span class="keyword">bool</span><span class="identifier"> a</span><span class="special">,</span><span class="keyword"> int</span><span class="identifier"> b</span><span class="special">)</span><span class="special">
|
||||
{</span><span class="comment">
|
||||
/*...*/</span><span class="special">
|
||||
}</span><span class="keyword">
|
||||
|
||||
void</span><span class="identifier"> foo</span><span class="special">(</span><span class="keyword">bool</span><span class="identifier"> a</span><span class="special">,</span><span class="keyword"> int</span><span class="identifier"> b</span><span class="special">,</span><span class="keyword"> char</span><span class="identifier"> c</span><span class="special">)</span><span class="special">
|
||||
{</span><span class="comment">
|
||||
/*...*/</span><span class="special">
|
||||
}</span></tt></pre>
|
||||
<p>
|
||||
Like in the previous section, we can generate thin wrappers for these
|
||||
overloaded functions in one-shot:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">BOOST_PYTHON_FUNCTION_OVERLOADS</span><span class="special">(</span><span class="identifier">foo_overloads</span><span class="special">,</span><span class="identifier"> foo</span><span class="special">,</span><span class="number"> 0</span><span class="special">,</span><span class="number"> 3</span><span class="special">)</span></tt></pre>
|
||||
<p>
|
||||
Then...</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="special">.</span><span class="identifier">def</span><span class="special">(</span><span class="string">"foo"</span><span class="special">,</span><span class="identifier"> foo</span><span class="special">,</span><span class="identifier"> foo_overloads</span><span class="special">());</span></tt></pre>
|
||||
<p>
|
||||
Notice though that we have a situation now where we have a minimum of zero
|
||||
(0) arguments and a maximum of 3 arguments.</p>
|
||||
<a name="auto_overloading.manual_wrapping"></a><h2>
|
||||
<a name="id457233"></a>Manual Wrapping</h2>
|
||||
<p>
|
||||
It is important to emphasize however that <span class="bold"><b>the overloaded functions must
|
||||
have a common sequence of initial arguments</b></span>. Otherwise, our scheme above
|
||||
will not work. If this is not the case, we have to wrap our functions
|
||||
<a href="functions.html#python.overloading" title="Overloading">manually</a>.</p>
|
||||
<p>
|
||||
Actually, we can mix and match manual wrapping of overloaded functions and
|
||||
automatic wrapping through <tt class="literal">BOOST_PYTHON_MEMBER_FUNCTION_OVERLOADS</tt> and
|
||||
its sister, <tt class="literal">BOOST_PYTHON_FUNCTION_OVERLOADS</tt>. Following up on our example
|
||||
presented in the section <a href="functions.html#python.overloading" title="Overloading">on overloading</a>, since the
|
||||
first 4 overload functins have a common sequence of initial arguments, we
|
||||
can use <tt class="literal">BOOST_PYTHON_MEMBER_FUNCTION_OVERLOADS</tt> to automatically wrap the
|
||||
first three of the <tt class="literal">def</tt>s and manually wrap just the last. Here's
|
||||
how we'll do this:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">BOOST_PYTHON_MEMBER_FUNCTION_OVERLOADS</span><span class="special">(</span><span class="identifier">xf_overloads</span><span class="special">,</span><span class="identifier"> f</span><span class="special">,</span><span class="number"> 1</span><span class="special">,</span><span class="number"> 4</span><span class="special">)</span></tt></pre>
|
||||
<p>
|
||||
Create a member function pointers as above for both X::f overloads:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="keyword">bool</span><span class="special"> (</span><span class="identifier">X</span><span class="special">::*</span><span class="identifier">fx1</span><span class="special">)(</span><span class="keyword">int</span><span class="special">,</span><span class="keyword"> double</span><span class="special">,</span><span class="keyword"> char</span><span class="special">)</span><span class="special"> =</span><span class="special"> &</span><span class="identifier">X</span><span class="special">::</span><span class="identifier">f</span><span class="special">;</span><span class="keyword">
|
||||
int</span><span class="special"> (</span><span class="identifier">X</span><span class="special">::*</span><span class="identifier">fx2</span><span class="special">)(</span><span class="keyword">int</span><span class="special">,</span><span class="keyword"> int</span><span class="special">,</span><span class="keyword"> int</span><span class="special">)</span><span class="special"> =</span><span class="special"> &</span><span class="identifier">X</span><span class="special">::</span><span class="identifier">f</span><span class="special">;</span></tt></pre>
|
||||
<p>
|
||||
Then...</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="special">.</span><span class="identifier">def</span><span class="special">(</span><span class="string">"f"</span><span class="special">,</span><span class="identifier"> fx1</span><span class="special">,</span><span class="identifier"> xf_overloads</span><span class="special">());</span><span class="special">
|
||||
.</span><span class="identifier">def</span><span class="special">(</span><span class="string">"f"</span><span class="special">,</span><span class="identifier"> fx2</span><span class="special">)</span></tt></pre>
|
||||
</div>
|
||||
</div>
|
||||
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
|
||||
<td align="left"></td>
|
||||
<td align="right"><small>Copyright © 2002-2004 Joel de Guzman, David Abrahams</small></td>
|
||||
</tr></table>
|
||||
<hr>
|
||||
<div class="spirit-nav">
|
||||
<a accesskey="p" href="exposing.html"><img src="../images/prev.png" alt="Prev"></a><a accesskey="u" href="../index.html"><img src="../images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="object.html"><img src="../images/next.png" alt="Next"></a>
|
||||
</div>
|
||||
</body>
|
||||
</html>
|
||||
230
doc/tutorial/doc/html/python/hello.html
Normal file
@@ -0,0 +1,230 @@
|
||||
<html>
|
||||
<head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
|
||||
<title> Building Hello World</title>
|
||||
<link rel="stylesheet" href="../boostbook.css" type="text/css">
|
||||
<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
|
||||
<link rel="start" href="../index.html" title="Chapter 1. python 1.0">
|
||||
<link rel="up" href="../index.html" title="Chapter 1. python 1.0">
|
||||
<link rel="prev" href="../index.html" title="Chapter 1. python 1.0">
|
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<link rel="next" href="exposing.html" title=" Exposing Classes">
|
||||
</head>
|
||||
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
|
||||
<table cellpadding="2" width="100%">
|
||||
<td valign="top"><img alt="boost.png (6897 bytes)" width="277" height="86" src="../../../../../../../boost.png"></td>
|
||||
<td align="center"><a href="../../../../../../../index.htm">Home</a></td>
|
||||
<td align="center"><a href="../../../../../../libraries.htm">Libraries</a></td>
|
||||
<td align="center"><a href="../../../../../../../people/people.htm">People</a></td>
|
||||
<td align="center"><a href="../../../../../../../more/faq.htm">FAQ</a></td>
|
||||
<td align="center"><a href="../../../../../../../more/index.htm">More</a></td>
|
||||
</table>
|
||||
<hr>
|
||||
<div class="spirit-nav">
|
||||
<a accesskey="p" href="../index.html"><img src="../images/prev.png" alt="Prev"></a><a accesskey="u" href="../index.html"><img src="../images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="exposing.html"><img src="../images/next.png" alt="Next"></a>
|
||||
</div>
|
||||
<div class="section" lang="en">
|
||||
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
|
||||
<a name="python.hello"></a> Building Hello World</h2></div></div></div>
|
||||
<a name="hello.from_start_to_finish"></a><h2>
|
||||
<a name="id446728"></a>From Start To Finish</h2>
|
||||
<p>
|
||||
Now the first thing you'd want to do is to build the Hello World module and
|
||||
try it for yourself in Python. In this section, we shall outline the steps
|
||||
necessary to achieve that. We shall use the build tool that comes bundled
|
||||
with every boost distribution: <span class="bold"><b>bjam</b></span>.</p>
|
||||
<div class="informaltable"><table class="table">
|
||||
<colgroup><col></colgroup>
|
||||
<tbody><tr><td>
|
||||
<span class="inlinemediaobject"><img src="../images/note.png"></span><span class="bold"><b>Building without bjam</b></span><p></p>
|
||||
<p></p>
|
||||
|
||||
Besides bjam, there are of course other ways to get your module built.
|
||||
What's written here should not be taken as "the one and only way".
|
||||
There are of course other build tools apart from <tt class="literal">bjam</tt>.<p></p>
|
||||
<p></p>
|
||||
|
||||
Take note however that the preferred build tool for Boost.Python is bjam.
|
||||
There are so many ways to set up the build incorrectly. Experience shows
|
||||
that 90% of the "I can't build Boost.Python" problems come from people
|
||||
who had to use a different tool.
|
||||
</td></tr></tbody>
|
||||
</table></div>
|
||||
<p>
|
||||
We shall skip over the details. Our objective will be to simply create the
|
||||
hello world module and run it in Python. For a complete reference to
|
||||
building Boost.Python, check out: <a href="../../../../building.html" target="_top">building.html</a>.
|
||||
After this brief <span class="emphasis"><em>bjam</em></span> tutorial, we should have built two DLLs:</p>
|
||||
<div class="itemizedlist"><ul type="disc">
|
||||
<li>
|
||||
boost_python.dll
|
||||
</li>
|
||||
<li>
|
||||
hello.pyd
|
||||
</li>
|
||||
</ul></div>
|
||||
<p>
|
||||
if you are on Windows, and</p>
|
||||
<div class="itemizedlist"><ul type="disc">
|
||||
<li>
|
||||
libboost_python.so
|
||||
</li>
|
||||
<li>
|
||||
hello.so
|
||||
</li>
|
||||
</ul></div>
|
||||
<p>
|
||||
if you are on Unix.</p>
|
||||
<p>
|
||||
The tutorial example can be found in the directory:
|
||||
<tt class="literal">libs/python/example/tutorial</tt>. There, you can find:</p>
|
||||
<div class="itemizedlist"><ul type="disc">
|
||||
<li>
|
||||
hello.cpp
|
||||
</li>
|
||||
<li>
|
||||
Jamfile
|
||||
</li>
|
||||
</ul></div>
|
||||
<p>
|
||||
The <tt class="literal">hello.cpp</tt> file is our C++ hello world example. The <tt class="literal">Jamfile</tt> is a
|
||||
minimalist <span class="emphasis"><em>bjam</em></span> script that builds the DLLs for us.</p>
|
||||
<p>
|
||||
Before anything else, you should have the bjam executable in your boost
|
||||
directory or somewhere in your path such that <tt class="literal">bjam</tt> can be executed in
|
||||
the command line. Pre-built Boost.Jam executables are available for most
|
||||
platforms. The complete list of Bjam executables can be found
|
||||
<a href="http://sourceforge.net/project/showfiles.php?group_id=7586" target="_top">here</a>.</p>
|
||||
<a name="hello.let_s_jam_"></a><h2>
|
||||
<a name="id377058"></a>Let's Jam!</h2>
|
||||
<p><span class="inlinemediaobject"><img src="../images/jam.png"></span></p>
|
||||
<p>
|
||||
Here is our minimalist Jamfile:</p>
|
||||
<pre class="programlisting"><tt class="literal"> subproject libs/python/example/tutorial ;
|
||||
|
||||
SEARCH on python.jam = $(BOOST_BUILD_PATH) ;
|
||||
include python.jam ;
|
||||
|
||||
extension hello # Declare a Python extension called hello
|
||||
: hello.cpp # source
|
||||
<dll>../../build/boost_python # dependencies
|
||||
;
|
||||
</tt></pre>
|
||||
<p>
|
||||
First, we need to specify our location in the boost project hierarchy.
|
||||
It so happens that the tutorial example is located in <tt class="literal">/libs/python/example/tutorial</tt>.
|
||||
Thus:</p>
|
||||
<pre class="programlisting"><tt class="literal"> subproject libs/python/example/tutorial ;
|
||||
</tt></pre>
|
||||
<p>
|
||||
Then we will include the definitions needed by Python modules:</p>
|
||||
<pre class="programlisting"><tt class="literal"> SEARCH on python.jam = $(BOOST_BUILD_PATH) ;
|
||||
include python.jam ;
|
||||
</tt></pre>
|
||||
<p>
|
||||
Finally we declare our <tt class="literal">hello</tt> extension:</p>
|
||||
<pre class="programlisting"><tt class="literal"> extension hello # Declare a Python extension called hello
|
||||
: hello.cpp # source
|
||||
<dll>../../build/boost_python # dependencies
|
||||
;
|
||||
</tt></pre>
|
||||
<a name="hello.running_bjam"></a><h2>
|
||||
<a name="id377153"></a>Running bjam</h2>
|
||||
<p><span class="emphasis"><em>bjam</em></span> is run using your operating system's command line interpreter.</p>
|
||||
<div class="blockquote"><blockquote class="blockquote"><p>Start it up.</p></blockquote></div>
|
||||
<p>
|
||||
Make sure that the environment is set so that we can invoke the C++
|
||||
compiler. With MSVC, that would mean running the <tt class="literal">Vcvars32.bat</tt> batch
|
||||
file. For instance:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">C</span><span class="special">:\</span><span class="identifier">Program</span><span class="identifier"> Files</span><span class="special">\</span><span class="identifier">Microsoft</span><span class="identifier"> Visual</span><span class="identifier"> Studio</span><span class="special">\</span><span class="identifier">VC98</span><span class="special">\</span><span class="identifier">bin</span><span class="special">\</span><span class="identifier">Vcvars32</span><span class="special">.</span><span class="identifier">bat</span></tt></pre>
|
||||
<p>
|
||||
Some environment variables will have to be setup for proper building of our
|
||||
Python modules. Example:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">set</span><span class="identifier"> PYTHON_ROOT</span><span class="special">=</span><span class="identifier">c</span><span class="special">:/</span><span class="identifier">dev</span><span class="special">/</span><span class="identifier">tools</span><span class="special">/</span><span class="identifier">python</span><span class="identifier">
|
||||
set</span><span class="identifier"> PYTHON_VERSION</span><span class="special">=</span><span class="number">2.2</span></tt></pre>
|
||||
<p>
|
||||
The above assumes that the Python installation is in <tt class="literal">c:/dev/tools/python</tt>
|
||||
and that we are using Python version 2.2. You'll have to tweak this path
|
||||
appropriately.</p>
|
||||
<div class="informaltable"><table class="table">
|
||||
<colgroup><col></colgroup>
|
||||
<tbody><tr><td>
|
||||
<span class="inlinemediaobject"><img src="../images/tip.png"></span> Be sure not to include a third number, e.g. <span class="bold"><b>not</b></span> "2.2.1",
|
||||
even if that's the version you have.</td></tr></tbody>
|
||||
</table></div>
|
||||
<p>
|
||||
Now we are ready... Be sure to <tt class="literal">cd</tt> to <tt class="literal">libs/python/example/tutorial</tt>
|
||||
where the tutorial <tt class="literal">"hello.cpp"</tt> and the <tt class="literal">"Jamfile"</tt> is situated.</p>
|
||||
<p>
|
||||
Finally:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">bjam</span><span class="special"> -</span><span class="identifier">sTOOLS</span><span class="special">=</span><span class="identifier">msvc</span></tt></pre>
|
||||
<p>
|
||||
We are again assuming that we are using Microsoft Visual C++ version 6. If
|
||||
not, then you will have to specify the appropriate tool. See
|
||||
<a href="../../../../../../../tools/build/index.html" target="_top">Building Boost Libraries</a> for
|
||||
further details.</p>
|
||||
<p>
|
||||
It should be building now:</p>
|
||||
<pre class="programlisting"><tt class="literal"> cd C:\dev\boost\libs\python\example\tutorial
|
||||
bjam -sTOOLS=msvc
|
||||
...patience...
|
||||
...found 1703 targets...
|
||||
...updating 40 targets...
|
||||
</tt></pre>
|
||||
<p>
|
||||
And so on... Finally:</p>
|
||||
<pre class="programlisting"><tt class="literal"> vc-C++ ........\libs\python\example\tutorial\bin\hello.pyd\msvc\debug\
|
||||
runtime-link-dynamic\hello.obj
|
||||
hello.cpp
|
||||
vc-Link ........\libs\python\example\tutorial\bin\hello.pyd\msvc\debug\
|
||||
runtime-link-dynamic\hello.pyd ........\libs\python\example\tutorial\bin\
|
||||
hello.pyd\msvc\debug\runtime-link-dynamic\hello.lib
|
||||
Creating library ........\libs\python\example\tutorial\bin\hello.pyd\
|
||||
msvc\debug\runtime-link-dynamic\hello.lib and object ........\libs\python\
|
||||
example\tutorial\bin\hello.pyd\msvc\debug\runtime-link-dynamic\hello.exp
|
||||
...updated 40 targets...
|
||||
</tt></pre>
|
||||
<p>
|
||||
If all is well, you should now have:</p>
|
||||
<div class="itemizedlist"><ul type="disc">
|
||||
<li>
|
||||
boost_python.dll
|
||||
</li>
|
||||
<li>
|
||||
hello.pyd
|
||||
</li>
|
||||
</ul></div>
|
||||
<p>
|
||||
if you are on Windows, and</p>
|
||||
<div class="itemizedlist"><ul type="disc">
|
||||
<li>
|
||||
libboost_python.so
|
||||
</li>
|
||||
<li>
|
||||
hello.so
|
||||
</li>
|
||||
</ul></div>
|
||||
<p>
|
||||
if you are on Unix.</p>
|
||||
<p><tt class="literal">boost_python.dll</tt> can be found somewhere in <tt class="literal">libs\python\build\bin</tt>
|
||||
while <tt class="literal">hello.pyd</tt> can be found somewhere in
|
||||
<tt class="literal">libs\python\example\tutorial\bin</tt>. After a successful build, you can just
|
||||
link in these DLLs with the Python interpreter. In Windows for example, you
|
||||
can simply put these libraries inside the directory where the Python
|
||||
executable is.</p>
|
||||
<p>
|
||||
You may now fire up Python and run our hello module:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="special">>>></span><span class="identifier"> import</span><span class="identifier"> hello</span><span class="special">
|
||||
>>></span><span class="identifier"> print</span><span class="identifier"> hello</span><span class="special">.</span><span class="identifier">greet</span><span class="special">()</span><span class="identifier">
|
||||
hello</span><span class="special">,</span><span class="identifier"> world</span></tt></pre>
|
||||
<div class="blockquote"><blockquote class="blockquote"><p><span class="bold"><b>There you go... Have fun!</b></span></p></blockquote></div>
|
||||
</div>
|
||||
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
|
||||
<td align="left"></td>
|
||||
<td align="right"><small>Copyright © 2002-2004 Joel de Guzman, David Abrahams</small></td>
|
||||
</tr></table>
|
||||
<hr>
|
||||
<div class="spirit-nav">
|
||||
<a accesskey="p" href="../index.html"><img src="../images/prev.png" alt="Prev"></a><a accesskey="u" href="../index.html"><img src="../images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="exposing.html"><img src="../images/next.png" alt="Next"></a>
|
||||
</div>
|
||||
</body>
|
||||
</html>
|
||||
128
doc/tutorial/doc/html/python/iterators.html
Normal file
@@ -0,0 +1,128 @@
|
||||
<html>
|
||||
<head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
|
||||
<title>Iterators</title>
|
||||
<link rel="stylesheet" href="../boostbook.css" type="text/css">
|
||||
<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
|
||||
<link rel="start" href="../index.html" title="Chapter 1. python 1.0">
|
||||
<link rel="up" href="../index.html" title="Chapter 1. python 1.0">
|
||||
<link rel="prev" href="embedding.html" title="Embedding">
|
||||
<link rel="next" href="exception.html" title=" Exception Translation">
|
||||
</head>
|
||||
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
|
||||
<table cellpadding="2" width="100%">
|
||||
<td valign="top"><img alt="boost.png (6897 bytes)" width="277" height="86" src="../../../../../../../boost.png"></td>
|
||||
<td align="center"><a href="../../../../../../../index.htm">Home</a></td>
|
||||
<td align="center"><a href="../../../../../../libraries.htm">Libraries</a></td>
|
||||
<td align="center"><a href="../../../../../../../people/people.htm">People</a></td>
|
||||
<td align="center"><a href="../../../../../../../more/faq.htm">FAQ</a></td>
|
||||
<td align="center"><a href="../../../../../../../more/index.htm">More</a></td>
|
||||
</table>
|
||||
<hr>
|
||||
<div class="spirit-nav">
|
||||
<a accesskey="p" href="embedding.html"><img src="../images/prev.png" alt="Prev"></a><a accesskey="u" href="../index.html"><img src="../images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="exception.html"><img src="../images/next.png" alt="Next"></a>
|
||||
</div>
|
||||
<div class="section" lang="en">
|
||||
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
|
||||
<a name="python.iterators"></a>Iterators</h2></div></div></div>
|
||||
<p>
|
||||
In C++, and STL in particular, we see iterators everywhere. Python also has
|
||||
iterators, but these are two very different beasts.</p>
|
||||
<p><span class="bold"><b>C++ iterators:</b></span></p>
|
||||
<div class="itemizedlist"><ul type="disc">
|
||||
<li>
|
||||
C++ has 5 type categories (random-access, bidirectional, forward, input, output)
|
||||
</li>
|
||||
<li>
|
||||
There are 2 Operation categories: reposition, access
|
||||
</li>
|
||||
<li>
|
||||
A pair of iterators is needed to represent a (first/last) range.
|
||||
</li>
|
||||
</ul></div>
|
||||
<p><span class="bold"><b>Python Iterators:</b></span></p>
|
||||
<div class="itemizedlist"><ul type="disc">
|
||||
<li>
|
||||
1 category (forward)
|
||||
</li>
|
||||
<li>
|
||||
1 operation category (next())
|
||||
</li>
|
||||
<li>
|
||||
Raises StopIteration exception at end
|
||||
</li>
|
||||
</ul></div>
|
||||
<p>
|
||||
The typical Python iteration protocol: <tt class="literal"><span class="bold"><b>for y in x...</b></span></tt> is as follows:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">iter</span><span class="special"> =</span><span class="identifier"> x</span><span class="special">.</span><span class="identifier">__iter__</span><span class="special">()</span> #<span class="identifier"> get</span><span class="identifier"> iterator</span><span class="keyword">
|
||||
try</span><span class="special">:</span><span class="keyword">
|
||||
while</span><span class="number"> 1</span><span class="special">:</span><span class="identifier">
|
||||
y</span><span class="special"> =</span><span class="identifier"> iter</span><span class="special">.</span><span class="identifier">next</span><span class="special">()</span> #<span class="identifier"> get</span><span class="identifier"> each</span><span class="identifier"> item</span><span class="special">
|
||||
...</span> #<span class="identifier"> process</span><span class="identifier"> y</span><span class="identifier">
|
||||
except</span><span class="identifier"> StopIteration</span><span class="special">:</span><span class="identifier"> pass</span> #<span class="identifier"> iterator</span><span class="identifier"> exhausted</span></tt></pre>
|
||||
<p>
|
||||
Boost.Python provides some mechanisms to make C++ iterators play along
|
||||
nicely as Python iterators. What we need to do is to produce
|
||||
appropriate <span class="underline">_iter</span>_ function from C++ iterators that is compatible
|
||||
with the Python iteration protocol. For example:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">object</span><span class="identifier"> get_iterator</span><span class="special"> =</span><span class="identifier"> iterator</span><span class="special"><</span><span class="identifier">vector</span><span class="special"><</span><span class="keyword">int</span><span class="special">></span><span class="special"> >();</span><span class="identifier">
|
||||
object</span><span class="identifier"> iter</span><span class="special"> =</span><span class="identifier"> get_iterator</span><span class="special">(</span><span class="identifier">v</span><span class="special">);</span><span class="identifier">
|
||||
object</span><span class="identifier"> first</span><span class="special"> =</span><span class="identifier"> iter</span><span class="special">.</span><span class="identifier">next</span><span class="special">();</span></tt></pre>
|
||||
<p>
|
||||
Or for use in class_<>:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="special">.</span><span class="identifier">def</span><span class="special">(</span><span class="string">"__iter__"</span><span class="special">,</span><span class="identifier"> iterator</span><span class="special"><</span><span class="identifier">vector</span><span class="special"><</span><span class="keyword">int</span><span class="special">></span><span class="special"> >())</span></tt></pre>
|
||||
<p><span class="bold"><b>range</b></span></p>
|
||||
<p>
|
||||
We can create a Python savvy iterator using the range function:</p>
|
||||
<div class="itemizedlist"><ul type="disc">
|
||||
<li>
|
||||
range(start, finish)
|
||||
</li>
|
||||
<li>
|
||||
range<Policies,Target>(start, finish)
|
||||
</li>
|
||||
</ul></div>
|
||||
<p>
|
||||
Here, start/finish may be one of:</p>
|
||||
<div class="itemizedlist"><ul type="disc">
|
||||
<li>
|
||||
member data pointers
|
||||
</li>
|
||||
<li>
|
||||
member function pointers
|
||||
</li>
|
||||
<li>
|
||||
adaptable function object (use Target parameter)
|
||||
</li>
|
||||
</ul></div>
|
||||
<p><span class="bold"><b>iterator</b></span></p>
|
||||
<div class="itemizedlist"><ul type="disc"><li>
|
||||
iterator<T, Policies>()
|
||||
</li></ul></div>
|
||||
<p>
|
||||
Given a container <tt class="literal">T</tt>, iterator is a shortcut that simply calls <tt class="literal">range</tt>
|
||||
with &T::begin, &T::end.</p>
|
||||
<p>
|
||||
Let's put this into action... Here's an example from some hypothetical
|
||||
bogon Particle accelerator code:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">f</span><span class="special"> =</span><span class="identifier"> Field</span><span class="special">()</span><span class="keyword">
|
||||
for</span><span class="identifier"> x</span><span class="identifier"> in</span><span class="identifier"> f</span><span class="special">.</span><span class="identifier">pions</span><span class="special">:</span><span class="identifier">
|
||||
smash</span><span class="special">(</span><span class="identifier">x</span><span class="special">)</span><span class="keyword">
|
||||
for</span><span class="identifier"> y</span><span class="identifier"> in</span><span class="identifier"> f</span><span class="special">.</span><span class="identifier">bogons</span><span class="special">:</span><span class="identifier">
|
||||
count</span><span class="special">(</span><span class="identifier">y</span><span class="special">)</span></tt></pre>
|
||||
<p>
|
||||
Now, our C++ Wrapper:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">class_</span><span class="special"><</span><span class="identifier">F</span><span class="special">>(</span><span class="string">"Field"</span><span class="special">)</span><span class="special">
|
||||
.</span><span class="identifier">property</span><span class="special">(</span><span class="string">"pions"</span><span class="special">,</span><span class="identifier"> range</span><span class="special">(&</span><span class="identifier">F</span><span class="special">::</span><span class="identifier">p_begin</span><span class="special">,</span><span class="special"> &</span><span class="identifier">F</span><span class="special">::</span><span class="identifier">p_end</span><span class="special">))</span><span class="special">
|
||||
.</span><span class="identifier">property</span><span class="special">(</span><span class="string">"bogons"</span><span class="special">,</span><span class="identifier"> range</span><span class="special">(&</span><span class="identifier">F</span><span class="special">::</span><span class="identifier">b_begin</span><span class="special">,</span><span class="special"> &</span><span class="identifier">F</span><span class="special">::</span><span class="identifier">b_end</span><span class="special">));</span></tt></pre>
|
||||
</div>
|
||||
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
|
||||
<td align="left"></td>
|
||||
<td align="right"><small>Copyright © 2002-2004 Joel de Guzman, David Abrahams</small></td>
|
||||
</tr></table>
|
||||
<hr>
|
||||
<div class="spirit-nav">
|
||||
<a accesskey="p" href="embedding.html"><img src="../images/prev.png" alt="Prev"></a><a accesskey="u" href="../index.html"><img src="../images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="exception.html"><img src="../images/next.png" alt="Next"></a>
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</div>
|
||||
</body>
|
||||
</html>
|
||||
258
doc/tutorial/doc/html/python/object.html
Normal file
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|
||||
<html>
|
||||
<head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
|
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<title> Object Interface</title>
|
||||
<link rel="stylesheet" href="../boostbook.css" type="text/css">
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<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
|
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<link rel="start" href="../index.html" title="Chapter 1. python 1.0">
|
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<link rel="up" href="../index.html" title="Chapter 1. python 1.0">
|
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<link rel="prev" href="functions.html" title="Functions">
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
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<table cellpadding="2" width="100%">
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<td valign="top"><img alt="boost.png (6897 bytes)" width="277" height="86" src="../../../../../../../boost.png"></td>
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<td align="center"><a href="../../../../../../../index.htm">Home</a></td>
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<td align="center"><a href="../../../../../../libraries.htm">Libraries</a></td>
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<td align="center"><a href="../../../../../../../people/people.htm">People</a></td>
|
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<td align="center"><a href="../../../../../../../more/faq.htm">FAQ</a></td>
|
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<td align="center"><a href="../../../../../../../more/index.htm">More</a></td>
|
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</table>
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||||
<hr>
|
||||
<div class="spirit-nav">
|
||||
<a accesskey="p" href="functions.html"><img src="../images/prev.png" alt="Prev"></a><a accesskey="u" href="../index.html"><img src="../images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="embedding.html"><img src="../images/next.png" alt="Next"></a>
|
||||
</div>
|
||||
<div class="section" lang="en">
|
||||
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
|
||||
<a name="python.object"></a> Object Interface</h2></div></div></div>
|
||||
<div class="toc"><dl>
|
||||
<dt><span class="section"><a href="object.html#python.basic_interface">Basic Interface</a></span></dt>
|
||||
<dt><span class="section"><a href="object.html#python.derived_object_types">Derived Object types</a></span></dt>
|
||||
<dt><span class="section"><a href="object.html#python.extracting_c___objects">Extracting C++ objects</a></span></dt>
|
||||
<dt><span class="section"><a href="object.html#python.enums">Enums</a></span></dt>
|
||||
</dl></div>
|
||||
<p>
|
||||
Python is dynamically typed, unlike C++ which is statically typed. Python
|
||||
variables may hold an integer, a float, list, dict, tuple, str, long etc.,
|
||||
among other things. In the viewpoint of Boost.Python and C++, these
|
||||
Pythonic variables are just instances of class <tt class="literal">object</tt>. We shall see in
|
||||
this chapter how to deal with Python objects.</p>
|
||||
<p>
|
||||
As mentioned, one of the goals of Boost.Python is to provide a
|
||||
bidirectional mapping between C++ and Python while maintaining the Python
|
||||
feel. Boost.Python C++ <tt class="literal">object</tt>s are as close as possible to Python. This
|
||||
should minimize the learning curve significantly.</p>
|
||||
<p><span class="inlinemediaobject"><img src="../images/python.png"></span></p>
|
||||
<div class="section" lang="en">
|
||||
<div class="titlepage"><div><div><h3 class="title">
|
||||
<a name="python.basic_interface"></a>Basic Interface</h3></div></div></div>
|
||||
<p>
|
||||
Class <tt class="literal">object</tt> wraps <tt class="literal">PyObject*</tt>. All the intricacies of dealing with
|
||||
<tt class="literal">PyObject</tt>s such as managing reference counting are handled by the
|
||||
<tt class="literal">object</tt> class. C++ object interoperability is seamless. Boost.Python C++
|
||||
<tt class="literal">object</tt>s can in fact be explicitly constructed from any C++ object.</p>
|
||||
<p>
|
||||
To illustrate, this Python code snippet:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">def</span><span class="identifier"> f</span><span class="special">(</span><span class="identifier">x</span><span class="special">,</span><span class="identifier"> y</span><span class="special">):</span><span class="keyword">
|
||||
if</span><span class="special"> (</span><span class="identifier">y</span><span class="special"> ==</span><span class="char"> 'foo'</span><span class="special">):</span><span class="identifier">
|
||||
x</span><span class="special">[</span><span class="number">3</span><span class="special">:</span><span class="number">7</span><span class="special">]</span><span class="special"> =</span><span class="char"> 'bar'</span><span class="keyword">
|
||||
else</span><span class="special">:</span><span class="identifier">
|
||||
x</span><span class="special">.</span><span class="identifier">items</span><span class="special"> +=</span><span class="identifier"> y</span><span class="special">(</span><span class="number">3</span><span class="special">,</span><span class="identifier"> x</span><span class="special">)</span><span class="keyword">
|
||||
return</span><span class="identifier"> x</span><span class="identifier">
|
||||
|
||||
def</span><span class="identifier"> getfunc</span><span class="special">():</span><span class="keyword">
|
||||
return</span><span class="identifier"> f</span><span class="special">;</span></tt></pre>
|
||||
<p>
|
||||
Can be rewritten in C++ using Boost.Python facilities this way:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">object</span><span class="identifier"> f</span><span class="special">(</span><span class="identifier">object</span><span class="identifier"> x</span><span class="special">,</span><span class="identifier"> object</span><span class="identifier"> y</span><span class="special">)</span><span class="special"> {</span><span class="keyword">
|
||||
if</span><span class="special"> (</span><span class="identifier">y</span><span class="special"> ==</span><span class="string"> "foo"</span><span class="special">)</span><span class="identifier">
|
||||
x</span><span class="special">.</span><span class="identifier">slice</span><span class="special">(</span><span class="number">3</span><span class="special">,</span><span class="number">7</span><span class="special">)</span><span class="special"> =</span><span class="string"> "bar"</span><span class="special">;</span><span class="keyword">
|
||||
else</span><span class="identifier">
|
||||
x</span><span class="special">.</span><span class="identifier">attr</span><span class="special">(</span><span class="string">"items"</span><span class="special">)</span><span class="special"> +=</span><span class="identifier"> y</span><span class="special">(</span><span class="number">3</span><span class="special">,</span><span class="identifier"> x</span><span class="special">);</span><span class="keyword">
|
||||
return</span><span class="identifier"> x</span><span class="special">;</span><span class="special">
|
||||
}</span><span class="identifier">
|
||||
object</span><span class="identifier"> getfunc</span><span class="special">()</span><span class="special"> {</span><span class="keyword">
|
||||
return</span><span class="identifier"> object</span><span class="special">(</span><span class="identifier">f</span><span class="special">);</span><span class="special">
|
||||
}</span></tt></pre>
|
||||
<p>
|
||||
Apart from cosmetic differences due to the fact that we are writing the
|
||||
code in C++, the look and feel should be immediately apparent to the Python
|
||||
coder.</p>
|
||||
</div>
|
||||
<div class="section" lang="en">
|
||||
<div class="titlepage"><div><div><h3 class="title">
|
||||
<a name="python.derived_object_types"></a>Derived Object types</h3></div></div></div>
|
||||
<p>
|
||||
Boost.Python comes with a set of derived <tt class="literal">object</tt> types corresponding to
|
||||
that of Python's:</p>
|
||||
<div class="itemizedlist"><ul type="disc">
|
||||
<li>
|
||||
list
|
||||
</li>
|
||||
<li>
|
||||
dict
|
||||
</li>
|
||||
<li>
|
||||
tuple
|
||||
</li>
|
||||
<li>
|
||||
str
|
||||
</li>
|
||||
<li>
|
||||
long_
|
||||
</li>
|
||||
<li>
|
||||
enum
|
||||
</li>
|
||||
</ul></div>
|
||||
<p>
|
||||
These derived <tt class="literal">object</tt> types act like real Python types. For instance:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">str</span><span class="special">(</span><span class="number">1</span><span class="special">)</span><span class="special"> ==></span><span class="string"> "1"</span></tt></pre>
|
||||
<p>
|
||||
Wherever appropriate, a particular derived <tt class="literal">object</tt> has corresponding
|
||||
Python type's methods. For instance, <tt class="literal">dict</tt> has a <tt class="literal">keys()</tt> method:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">d</span><span class="special">.</span><span class="identifier">keys</span><span class="special">()</span></tt></pre>
|
||||
<p><tt class="literal">make_tuple</tt> is provided for declaring <span class="emphasis"><em>tuple literals</em></span>. Example:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">make_tuple</span><span class="special">(</span><span class="number">123</span><span class="special">,</span><span class="char"> 'D'</span><span class="special">,</span><span class="string"> "Hello, World"</span><span class="special">,</span><span class="number"> 0.0</span><span class="special">);</span></tt></pre>
|
||||
<p>
|
||||
In C++, when Boost.Python <tt class="literal">object</tt>s are used as arguments to functions,
|
||||
subtype matching is required. For example, when a function <tt class="literal">f</tt>, as
|
||||
declared below, is wrapped, it will only accept instances of Python's
|
||||
<tt class="literal">str</tt> type and subtypes.</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="keyword">void</span><span class="identifier"> f</span><span class="special">(</span><span class="identifier">str</span><span class="identifier"> name</span><span class="special">)</span><span class="special">
|
||||
{</span><span class="identifier">
|
||||
object</span><span class="identifier"> n2</span><span class="special"> =</span><span class="identifier"> name</span><span class="special">.</span><span class="identifier">attr</span><span class="special">(</span><span class="string">"upper"</span><span class="special">)();</span><span class="comment"> // NAME = name.upper()
|
||||
</span><span class="identifier"> str</span><span class="identifier"> NAME</span><span class="special"> =</span><span class="identifier"> name</span><span class="special">.</span><span class="identifier">upper</span><span class="special">();</span><span class="comment"> // better
|
||||
</span><span class="identifier"> object</span><span class="identifier"> msg</span><span class="special"> =</span><span class="string"> "%s is bigger than %s"</span><span class="special"> %</span><span class="identifier"> make_tuple</span><span class="special">(</span><span class="identifier">NAME</span><span class="special">,</span><span class="identifier">name</span><span class="special">);</span><span class="special">
|
||||
}</span></tt></pre>
|
||||
<p>
|
||||
In finer detail:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">str</span><span class="identifier"> NAME</span><span class="special"> =</span><span class="identifier"> name</span><span class="special">.</span><span class="identifier">upper</span><span class="special">();</span></tt></pre>
|
||||
<p>
|
||||
Illustrates that we provide versions of the str type's methods as C++
|
||||
member functions.</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">object</span><span class="identifier"> msg</span><span class="special"> =</span><span class="string"> "%s is bigger than %s"</span><span class="special"> %</span><span class="identifier"> make_tuple</span><span class="special">(</span><span class="identifier">NAME</span><span class="special">,</span><span class="identifier">name</span><span class="special">);</span></tt></pre>
|
||||
<p>
|
||||
Demonstrates that you can write the C++ equivalent of <tt class="literal">"format" % x,y,z</tt>
|
||||
in Python, which is useful since there's no easy way to do that in std C++.</p>
|
||||
<p><span class="inlinemediaobject"><img src="../images/alert.png"></span><span class="bold"><b>Beware</b></span> the common pitfall of forgetting that the constructors
|
||||
of most of Python's mutable types make copies, just as in Python.</p>
|
||||
<p>
|
||||
Python:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="special">>>></span><span class="identifier"> d</span><span class="special"> =</span><span class="identifier"> dict</span><span class="special">(</span><span class="identifier">x</span><span class="special">.</span><span class="identifier">__dict__</span><span class="special">)</span> #<span class="identifier"> copies</span><span class="identifier"> x</span><span class="special">.</span><span class="identifier">__dict__</span><span class="special">
|
||||
>>></span><span class="identifier"> d</span><span class="special">[</span><span class="char">'whatever'</span><span class="special">]</span> #<span class="identifier"> modifies</span><span class="identifier"> the</span><span class="identifier"> copy</span></tt></pre>
|
||||
<p>
|
||||
C++:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">dict</span><span class="identifier"> d</span><span class="special">(</span><span class="identifier">x</span><span class="special">.</span><span class="identifier">attr</span><span class="special">(</span><span class="string">"__dict__"</span><span class="special">));</span> #<span class="identifier"> copies</span><span class="identifier"> x</span><span class="special">.</span><span class="identifier">__dict__</span><span class="identifier">
|
||||
d</span><span class="special">[</span><span class="char">'whatever'</span><span class="special">]</span><span class="special"> =</span><span class="number"> 3</span><span class="special">;</span> #<span class="identifier"> modifies</span><span class="identifier"> the</span><span class="identifier"> copy</span></tt></pre>
|
||||
<a name="derived_object_types.class__lt_t_gt__as_objects"></a><h2>
|
||||
<a name="id459043"></a>class_<T> as objects</h2>
|
||||
<p>
|
||||
Due to the dynamic nature of Boost.Python objects, any <tt class="literal">class_<T></tt> may
|
||||
also be one of these types! The following code snippet wraps the class
|
||||
(type) object.</p>
|
||||
<p>
|
||||
We can use this to create wrapped instances. Example:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">object</span><span class="identifier"> vec345</span><span class="special"> =</span><span class="special"> (</span><span class="identifier">
|
||||
class_</span><span class="special"><</span><span class="identifier">Vec2</span><span class="special">>(</span><span class="string">"Vec2"</span><span class="special">,</span><span class="identifier"> init</span><span class="special"><</span><span class="keyword">double</span><span class="special">,</span><span class="keyword"> double</span><span class="special">>())</span><span class="special">
|
||||
.</span><span class="identifier">def_readonly</span><span class="special">(</span><span class="string">"length"</span><span class="special">,</span><span class="special"> &</span><span class="identifier">Point</span><span class="special">::</span><span class="identifier">length</span><span class="special">)</span><span class="special">
|
||||
.</span><span class="identifier">def_readonly</span><span class="special">(</span><span class="string">"angle"</span><span class="special">,</span><span class="special"> &</span><span class="identifier">Point</span><span class="special">::</span><span class="identifier">angle</span><span class="special">)</span><span class="special">
|
||||
)(</span><span class="number">3.0</span><span class="special">,</span><span class="number"> 4.0</span><span class="special">);</span><span class="identifier">
|
||||
|
||||
assert</span><span class="special">(</span><span class="identifier">vec345</span><span class="special">.</span><span class="identifier">attr</span><span class="special">(</span><span class="string">"length"</span><span class="special">)</span><span class="special"> ==</span><span class="number"> 5.0</span><span class="special">);</span></tt></pre>
|
||||
</div>
|
||||
<div class="section" lang="en">
|
||||
<div class="titlepage"><div><div><h3 class="title">
|
||||
<a name="python.extracting_c___objects"></a>Extracting C++ objects</h3></div></div></div>
|
||||
<p>
|
||||
At some point, we will need to get C++ values out of object instances. This
|
||||
can be achieved with the <tt class="literal">extract<T></tt> function. Consider the following:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="keyword">double</span><span class="identifier"> x</span><span class="special"> =</span><span class="identifier"> o</span><span class="special">.</span><span class="identifier">attr</span><span class="special">(</span><span class="string">"length"</span><span class="special">);</span><span class="comment"> // compile error
|
||||
</span></tt></pre>
|
||||
<p>
|
||||
In the code above, we got a compiler error because Boost.Python
|
||||
<tt class="literal">object</tt> can't be implicitly converted to <tt class="literal">double</tt>s. Instead, what
|
||||
we wanted to do above can be achieved by writing:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="keyword">double</span><span class="identifier"> l</span><span class="special"> =</span><span class="identifier"> extract</span><span class="special"><</span><span class="keyword">double</span><span class="special">>(</span><span class="identifier">o</span><span class="special">.</span><span class="identifier">attr</span><span class="special">(</span><span class="string">"length"</span><span class="special">));</span><span class="identifier">
|
||||
Vec2</span><span class="special">&</span><span class="identifier"> v</span><span class="special"> =</span><span class="identifier"> extract</span><span class="special"><</span><span class="identifier">Vec2</span><span class="special">&>(</span><span class="identifier">o</span><span class="special">);</span><span class="identifier">
|
||||
assert</span><span class="special">(</span><span class="identifier">l</span><span class="special"> ==</span><span class="identifier"> v</span><span class="special">.</span><span class="identifier">length</span><span class="special">());</span></tt></pre>
|
||||
<p>
|
||||
The first line attempts to extract the "length" attribute of the
|
||||
Boost.Python <tt class="literal">object</tt><tt class="literal">o</tt>. The second line attempts to <span class="emphasis"><em>extract</em></span> the
|
||||
<tt class="literal">Vec2</tt> object from held by the Boost.Python <tt class="literal">object</tt><tt class="literal">o</tt>.</p>
|
||||
<p>
|
||||
Take note that we said "attempt to" above. What if the Boost.Python
|
||||
<tt class="literal">object</tt><tt class="literal">o</tt> does not really hold a <tt class="literal">Vec2</tt> type? This is certainly
|
||||
a possibility considering the dynamic nature of Python <tt class="literal">object</tt>s. To
|
||||
be on the safe side, if the C++ type can't be extracted, an
|
||||
appropriate exception is thrown. To avoid an exception, we need to
|
||||
test for extractibility:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">extract</span><span class="special"><</span><span class="identifier">Vec2</span><span class="special">&></span><span class="identifier"> x</span><span class="special">(</span><span class="identifier">o</span><span class="special">);</span><span class="keyword">
|
||||
if</span><span class="special"> (</span><span class="identifier">x</span><span class="special">.</span><span class="identifier">check</span><span class="special">())</span><span class="special"> {</span><span class="identifier">
|
||||
Vec2</span><span class="special">&</span><span class="identifier"> v</span><span class="special"> =</span><span class="identifier"> x</span><span class="special">();</span><span class="special"> ...</span></tt></pre>
|
||||
<p><span class="inlinemediaobject"><img src="../images/tip.png"></span> The astute reader might have noticed that the <tt class="literal">extract<T></tt>
|
||||
facility in fact solves the mutable copying problem:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">dict</span><span class="identifier"> d</span><span class="special"> =</span><span class="identifier"> extract</span><span class="special"><</span><span class="identifier">dict</span><span class="special">>(</span><span class="identifier">x</span><span class="special">.</span><span class="identifier">attr</span><span class="special">(</span><span class="string">"__dict__"</span><span class="special">));</span><span class="identifier">
|
||||
d</span><span class="special">[</span><span class="char">'whatever'</span><span class="special">]</span><span class="special"> =</span><span class="number"> 3</span><span class="special">;</span> #<span class="identifier"> modifies</span><span class="identifier"> x</span><span class="special">.</span><span class="identifier">__dict__</span><span class="special"> !</span></tt></pre>
|
||||
</div>
|
||||
<div class="section" lang="en">
|
||||
<div class="titlepage"><div><div><h3 class="title">
|
||||
<a name="python.enums"></a>Enums</h3></div></div></div>
|
||||
<p>
|
||||
Boost.Python has a nifty facility to capture and wrap C++ enums. While
|
||||
Python has no <tt class="literal">enum</tt> type, we'll often want to expose our C++ enums to
|
||||
Python as an <tt class="literal">int</tt>. Boost.Python's enum facility makes this easy while
|
||||
taking care of the proper conversions from Python's dynamic typing to C++'s
|
||||
strong static typing (in C++, ints cannot be implicitly converted to
|
||||
enums). To illustrate, given a C++ enum:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="keyword">enum</span><span class="identifier"> choice</span><span class="special"> {</span><span class="identifier"> red</span><span class="special">,</span><span class="identifier"> blue</span><span class="special"> };</span></tt></pre>
|
||||
<p>
|
||||
the construct:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">enum_</span><span class="special"><</span><span class="identifier">choice</span><span class="special">>(</span><span class="string">"choice"</span><span class="special">)</span><span class="special">
|
||||
.</span><span class="identifier">value</span><span class="special">(</span><span class="string">"red"</span><span class="special">,</span><span class="identifier"> red</span><span class="special">)</span><span class="special">
|
||||
.</span><span class="identifier">value</span><span class="special">(</span><span class="string">"blue"</span><span class="special">,</span><span class="identifier"> blue</span><span class="special">)</span><span class="special">
|
||||
;</span></tt></pre>
|
||||
<p>
|
||||
can be used to expose to Python. The new enum type is created in the
|
||||
current <tt class="literal">scope()</tt>, which is usually the current module. The snippet above
|
||||
creates a Python class derived from Python's <tt class="literal">int</tt> type which is
|
||||
associated with the C++ type passed as its first parameter.</p>
|
||||
<div class="informaltable"><table class="table">
|
||||
<colgroup><col></colgroup>
|
||||
<tbody><tr><td>
|
||||
<span class="inlinemediaobject"><img src="../images/note.png"></span><span class="bold"><b>what is a scope?</b></span><p></p>
|
||||
<p></p>
|
||||
The scope is a class that has an
|
||||
associated global Python object which controls the Python namespace in
|
||||
which new extension classes and wrapped functions will be defined as
|
||||
attributes. Details can be found <a href="../../../../v2/scope.html" target="_top">here</a>.</td></tr></tbody>
|
||||
</table></div>
|
||||
<p>
|
||||
You can access those values in Python as</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="special">>>></span><span class="identifier"> my_module</span><span class="special">.</span><span class="identifier">choice</span><span class="special">.</span><span class="identifier">red</span><span class="identifier">
|
||||
my_module</span><span class="special">.</span><span class="identifier">choice</span><span class="special">.</span><span class="identifier">red</span></tt></pre>
|
||||
<p>
|
||||
where my_module is the module where the enum is declared. You can also
|
||||
create a new scope around a class:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">scope</span><span class="identifier"> in_X</span><span class="special"> =</span><span class="identifier"> class_</span><span class="special"><</span><span class="identifier">X</span><span class="special">>(</span><span class="string">"X"</span><span class="special">)</span><span class="special">
|
||||
.</span><span class="identifier">def</span><span class="special">(</span><span class="special"> ...</span><span class="special"> )</span><span class="special">
|
||||
.</span><span class="identifier">def</span><span class="special">(</span><span class="special"> ...</span><span class="special"> )</span><span class="special">
|
||||
;</span><span class="comment">
|
||||
|
||||
// Expose X::nested as X.nested
|
||||
</span><span class="identifier">enum_</span><span class="special"><</span><span class="identifier">X</span><span class="special">::</span><span class="identifier">nested</span><span class="special">>(</span><span class="string">"nested"</span><span class="special">)</span><span class="special">
|
||||
.</span><span class="identifier">value</span><span class="special">(</span><span class="string">"red"</span><span class="special">,</span><span class="identifier"> red</span><span class="special">)</span><span class="special">
|
||||
.</span><span class="identifier">value</span><span class="special">(</span><span class="string">"blue"</span><span class="special">,</span><span class="identifier"> blue</span><span class="special">)</span><span class="special">
|
||||
;</span></tt></pre>
|
||||
</div>
|
||||
</div>
|
||||
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
|
||||
<td align="left"></td>
|
||||
<td align="right"><small>Copyright © 2002-2004 Joel de Guzman, David Abrahams</small></td>
|
||||
</tr></table>
|
||||
<hr>
|
||||
<div class="spirit-nav">
|
||||
<a accesskey="p" href="functions.html"><img src="../images/prev.png" alt="Prev"></a><a accesskey="u" href="../index.html"><img src="../images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="embedding.html"><img src="../images/next.png" alt="Next"></a>
|
||||
</div>
|
||||
</body>
|
||||
</html>
|
||||
361
doc/tutorial/doc/html/python/techniques.html
Normal file
@@ -0,0 +1,361 @@
|
||||
<html>
|
||||
<head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
|
||||
<title> General Techniques</title>
|
||||
<link rel="stylesheet" href="../boostbook.css" type="text/css">
|
||||
<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
|
||||
<link rel="start" href="../index.html" title="Chapter 1. python 1.0">
|
||||
<link rel="up" href="../index.html" title="Chapter 1. python 1.0">
|
||||
<link rel="prev" href="exception.html" title=" Exception Translation">
|
||||
</head>
|
||||
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
|
||||
<table cellpadding="2" width="100%">
|
||||
<td valign="top"><img alt="boost.png (6897 bytes)" width="277" height="86" src="../../../../../../../boost.png"></td>
|
||||
<td align="center"><a href="../../../../../../../index.htm">Home</a></td>
|
||||
<td align="center"><a href="../../../../../../libraries.htm">Libraries</a></td>
|
||||
<td align="center"><a href="../../../../../../../people/people.htm">People</a></td>
|
||||
<td align="center"><a href="../../../../../../../more/faq.htm">FAQ</a></td>
|
||||
<td align="center"><a href="../../../../../../../more/index.htm">More</a></td>
|
||||
</table>
|
||||
<hr>
|
||||
<div class="spirit-nav">
|
||||
<a accesskey="p" href="exception.html"><img src="../images/prev.png" alt="Prev"></a><a accesskey="u" href="../index.html"><img src="../images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a>
|
||||
</div>
|
||||
<div class="section" lang="en">
|
||||
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
|
||||
<a name="python.techniques"></a> General Techniques</h2></div></div></div>
|
||||
<div class="toc"><dl>
|
||||
<dt><span class="section"><a href="techniques.html#python.creating_packages">Creating Packages</a></span></dt>
|
||||
<dt><span class="section"><a href="techniques.html#python.extending_wrapped_objects_in_python">Extending Wrapped Objects in Python</a></span></dt>
|
||||
<dt><span class="section"><a href="techniques.html#python.reducing_compiling_time">Reducing Compiling Time</a></span></dt>
|
||||
</dl></div>
|
||||
<p>
|
||||
Here are presented some useful techniques that you can use while wrapping code with Boost.Python.</p>
|
||||
<div class="section" lang="en">
|
||||
<div class="titlepage"><div><div><h3 class="title">
|
||||
<a name="python.creating_packages"></a>Creating Packages</h3></div></div></div>
|
||||
<p>
|
||||
A Python package is a collection of modules that provide to the user a certain
|
||||
functionality. If you're not familiar on how to create packages, a good
|
||||
introduction to them is provided in the
|
||||
<a href="http://www.python.org/doc/current/tut/node8.html" target="_top">Python Tutorial</a>.</p>
|
||||
<p>
|
||||
But we are wrapping C++ code, using Boost.Python. How can we provide a nice
|
||||
package interface to our users? To better explain some concepts, let's work
|
||||
with an example.</p>
|
||||
<p>
|
||||
We have a C++ library that works with sounds: reading and writing various
|
||||
formats, applying filters to the sound data, etc. It is named (conveniently)
|
||||
<tt class="literal">sounds</tt>. Our library already has a neat C++ namespace hierarchy, like so:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">sounds</span><span class="special">::</span><span class="identifier">core</span><span class="identifier">
|
||||
sounds</span><span class="special">::</span><span class="identifier">io</span><span class="identifier">
|
||||
sounds</span><span class="special">::</span><span class="identifier">filters</span></tt></pre>
|
||||
<p>
|
||||
We would like to present this same hierarchy to the Python user, allowing him
|
||||
to write code like this:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">import</span><span class="identifier"> sounds</span><span class="special">.</span><span class="identifier">filters</span><span class="identifier">
|
||||
sounds</span><span class="special">.</span><span class="identifier">filters</span><span class="special">.</span><span class="identifier">echo</span><span class="special">(...)</span> #<span class="identifier"> echo</span><span class="identifier"> is</span><span class="identifier"> a</span><span class="identifier"> C</span><span class="special">++</span><span class="identifier"> function</span></tt></pre>
|
||||
<p>
|
||||
The first step is to write the wrapping code. We have to export each module
|
||||
separately with Boost.Python, like this:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="comment">/* file core.cpp */</span><span class="identifier">
|
||||
BOOST_PYTHON_MODULE</span><span class="special">(</span><span class="identifier">core</span><span class="special">)</span><span class="special">
|
||||
{</span><span class="comment">
|
||||
/* export everything in the sounds::core namespace */</span><span class="special">
|
||||
...</span><span class="special">
|
||||
}</span><span class="comment">
|
||||
|
||||
/* file io.cpp */</span><span class="identifier">
|
||||
BOOST_PYTHON_MODULE</span><span class="special">(</span><span class="identifier">io</span><span class="special">)</span><span class="special">
|
||||
{</span><span class="comment">
|
||||
/* export everything in the sounds::io namespace */</span><span class="special">
|
||||
...</span><span class="special">
|
||||
}</span><span class="comment">
|
||||
|
||||
/* file filters.cpp */</span><span class="identifier">
|
||||
BOOST_PYTHON_MODULE</span><span class="special">(</span><span class="identifier">filters</span><span class="special">)</span><span class="special">
|
||||
{</span><span class="comment">
|
||||
/* export everything in the sounds::filters namespace */</span><span class="special">
|
||||
...</span><span class="special">
|
||||
}</span></tt></pre>
|
||||
<p>
|
||||
Compiling these files will generate the following Python extensions:
|
||||
<tt class="literal">core.pyd</tt>, <tt class="literal">io.pyd</tt> and <tt class="literal">filters.pyd</tt>.</p>
|
||||
<div class="informaltable"><table class="table">
|
||||
<colgroup><col></colgroup>
|
||||
<tbody><tr><td>
|
||||
<span class="inlinemediaobject"><img src="../images/note.png"></span> The extension <tt class="literal">.pyd</tt> is used for python extension modules, which
|
||||
are just shared libraries. Using the default for your system, like <tt class="literal">.so</tt> for
|
||||
Unix and <tt class="literal">.dll</tt> for Windows, works just as well.</td></tr></tbody>
|
||||
</table></div>
|
||||
<p>
|
||||
Now, we create this directory structure for our Python package:</p>
|
||||
<pre class="programlisting"><tt class="literal"> sounds/
|
||||
<span class="underline">_init</span>_.py
|
||||
core.pyd
|
||||
filters.pyd
|
||||
io.pyd
|
||||
</tt></pre>
|
||||
<p>
|
||||
The file <tt class="literal"><span class="underline">_init</span>_.py</tt> is what tells Python that the directory <tt class="literal">sounds/</tt> is
|
||||
actually a Python package. It can be a empty file, but can also perform some
|
||||
magic, that will be shown later.</p>
|
||||
<p>
|
||||
Now our package is ready. All the user has to do is put <tt class="literal">sounds</tt> into his
|
||||
<a href="http://www.python.org/doc/current/tut/node8.html#SECTION008110000000000000000" target="_top">PYTHONPATH</a>
|
||||
and fire up the interpreter:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="special">>>></span><span class="identifier"> import</span><span class="identifier"> sounds</span><span class="special">.</span><span class="identifier">io</span><span class="special">
|
||||
>>></span><span class="identifier"> import</span><span class="identifier"> sounds</span><span class="special">.</span><span class="identifier">filters</span><span class="special">
|
||||
>>></span><span class="identifier"> sound</span><span class="special"> =</span><span class="identifier"> sounds</span><span class="special">.</span><span class="identifier">io</span><span class="special">.</span><span class="identifier">open</span><span class="special">(</span><span class="char">'file.mp3'</span><span class="special">)</span><span class="special">
|
||||
>>></span><span class="identifier"> new_sound</span><span class="special"> =</span><span class="identifier"> sounds</span><span class="special">.</span><span class="identifier">filters</span><span class="special">.</span><span class="identifier">echo</span><span class="special">(</span><span class="identifier">sound</span><span class="special">,</span><span class="number"> 1.0</span><span class="special">)</span></tt></pre>
|
||||
<p>
|
||||
Nice heh?</p>
|
||||
<p>
|
||||
This is the simplest way to create hierarchies of packages, but it is not very
|
||||
flexible. What if we want to add a <span class="emphasis"><em>pure</em></span> Python function to the filters
|
||||
package, for instance, one that applies 3 filters in a sound object at once?
|
||||
Sure, you can do this in C++ and export it, but why not do so in Python? You
|
||||
don't have to recompile the extension modules, plus it will be easier to write
|
||||
it.</p>
|
||||
<p>
|
||||
If we want this flexibility, we will have to complicate our package hierarchy a
|
||||
little. First, we will have to change the name of the extension modules:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="comment">/* file core.cpp */</span><span class="identifier">
|
||||
BOOST_PYTHON_MODULE</span><span class="special">(</span><span class="identifier">_core</span><span class="special">)</span><span class="special">
|
||||
{</span><span class="special">
|
||||
...</span><span class="comment">
|
||||
/* export everything in the sounds::core namespace */</span><span class="special">
|
||||
}</span></tt></pre>
|
||||
<p>
|
||||
Note that we added an underscore to the module name. The filename will have to
|
||||
be changed to <tt class="literal">_core.pyd</tt> as well, and we do the same to the other extension modules.
|
||||
Now, we change our package hierarchy like so:</p>
|
||||
<pre class="programlisting"><tt class="literal"> sounds/
|
||||
<span class="underline">_init</span>_.py
|
||||
core/
|
||||
<span class="underline">_init</span>_.py
|
||||
_core.pyd
|
||||
filters/
|
||||
<span class="underline">_init</span>_.py
|
||||
_filters.pyd
|
||||
io/
|
||||
<span class="underline">_init</span>_.py
|
||||
_io.pyd
|
||||
</tt></pre>
|
||||
<p>
|
||||
Note that we created a directory for each extension module, and added a
|
||||
<span class="underline">_init</span>_.py to each one. But if we leave it that way, the user will have to
|
||||
access the functions in the core module with this syntax:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="special">>>></span><span class="identifier"> import</span><span class="identifier"> sounds</span><span class="special">.</span><span class="identifier">core</span><span class="special">.</span><span class="identifier">_core</span><span class="special">
|
||||
>>></span><span class="identifier"> sounds</span><span class="special">.</span><span class="identifier">core</span><span class="special">.</span><span class="identifier">_core</span><span class="special">.</span><span class="identifier">foo</span><span class="special">(...)</span></tt></pre>
|
||||
<p>
|
||||
which is not what we want. But here enters the <tt class="literal"><span class="underline">_init</span>_.py</tt> magic: everything
|
||||
that is brought to the <tt class="literal"><span class="underline">_init</span>_.py</tt> namespace can be accessed directly by the
|
||||
user. So, all we have to do is bring the entire namespace from <tt class="literal">_core.pyd</tt>
|
||||
to <tt class="literal">core/<span class="underline">_init</span><span class="underline">.py]. So add this line of code to [^sounds/core/</span><span class="underline">init</span>_.py</tt>:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">from</span><span class="identifier"> _core</span><span class="identifier"> import</span><span class="special"> *</span></tt></pre>
|
||||
<p>
|
||||
We do the same for the other packages. Now the user accesses the functions and
|
||||
classes in the extension modules like before:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="special">>>></span><span class="identifier"> import</span><span class="identifier"> sounds</span><span class="special">.</span><span class="identifier">filters</span><span class="special">
|
||||
>>></span><span class="identifier"> sounds</span><span class="special">.</span><span class="identifier">filters</span><span class="special">.</span><span class="identifier">echo</span><span class="special">(...)</span></tt></pre>
|
||||
<p>
|
||||
with the additional benefit that we can easily add pure Python functions to
|
||||
any module, in a way that the user can't tell the difference between a C++
|
||||
function and a Python function. Let's add a <span class="emphasis"><em>pure</em></span> Python function,
|
||||
<tt class="literal">echo_noise</tt>, to the <tt class="literal">filters</tt> package. This function applies both the
|
||||
<tt class="literal">echo</tt> and <tt class="literal">noise</tt> filters in sequence in the given <tt class="literal">sound</tt> object. We
|
||||
create a file named <tt class="literal">sounds/filters/echo_noise.py</tt> and code our function:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">import</span><span class="identifier"> _filters</span><span class="identifier">
|
||||
def</span><span class="identifier"> echo_noise</span><span class="special">(</span><span class="identifier">sound</span><span class="special">):</span><span class="identifier">
|
||||
s</span><span class="special"> =</span><span class="identifier"> _filters</span><span class="special">.</span><span class="identifier">echo</span><span class="special">(</span><span class="identifier">sound</span><span class="special">)</span><span class="identifier">
|
||||
s</span><span class="special"> =</span><span class="identifier"> _filters</span><span class="special">.</span><span class="identifier">noise</span><span class="special">(</span><span class="identifier">sound</span><span class="special">)</span><span class="keyword">
|
||||
return</span><span class="identifier"> s</span></tt></pre>
|
||||
<p>
|
||||
Next, we add this line to <tt class="literal">sounds<span class="emphasis"><em>filters</em></span><span class="underline">_init</span>_.py</tt>:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">from</span><span class="identifier"> echo_noise</span><span class="identifier"> import</span><span class="identifier"> echo_noise</span></tt></pre>
|
||||
<p>
|
||||
And that's it. The user now accesses this function like any other function
|
||||
from the <tt class="literal">filters</tt> package:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="special">>>></span><span class="identifier"> import</span><span class="identifier"> sounds</span><span class="special">.</span><span class="identifier">filters</span><span class="special">
|
||||
>>></span><span class="identifier"> sounds</span><span class="special">.</span><span class="identifier">filters</span><span class="special">.</span><span class="identifier">echo_noise</span><span class="special">(...)</span></tt></pre>
|
||||
</div>
|
||||
<div class="section" lang="en">
|
||||
<div class="titlepage"><div><div><h3 class="title">
|
||||
<a name="python.extending_wrapped_objects_in_python"></a>Extending Wrapped Objects in Python</h3></div></div></div>
|
||||
<p>
|
||||
Thanks to Python's flexibility, you can easily add new methods to a class,
|
||||
even after it was already created:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="special">>>></span><span class="keyword"> class</span><span class="identifier"> C</span><span class="special">(</span><span class="identifier">object</span><span class="special">):</span><span class="identifier"> pass</span><span class="special">
|
||||
>>></span><span class="special">
|
||||
>>></span> #<span class="identifier"> a</span><span class="identifier"> regular</span><span class="identifier"> function</span><span class="special">
|
||||
>>></span><span class="identifier"> def</span><span class="identifier"> C_str</span><span class="special">(</span><span class="identifier">self</span><span class="special">):</span><span class="keyword"> return</span><span class="char"> 'A C instance!'</span><span class="special">
|
||||
>>></span><span class="special">
|
||||
>>></span> #<span class="identifier"> now</span><span class="identifier"> we</span><span class="identifier"> turn</span><span class="identifier"> it</span><span class="identifier"> in</span><span class="identifier"> a</span><span class="identifier"> member</span><span class="identifier"> function</span><span class="special">
|
||||
>>></span><span class="identifier"> C</span><span class="special">.</span><span class="identifier">__str__</span><span class="special"> =</span><span class="identifier"> C_str</span><span class="special">
|
||||
>>></span><span class="special">
|
||||
>>></span><span class="identifier"> c</span><span class="special"> =</span><span class="identifier"> C</span><span class="special">()</span><span class="special">
|
||||
>>></span><span class="identifier"> print</span><span class="identifier"> c</span><span class="identifier">
|
||||
A</span><span class="identifier"> C</span><span class="identifier"> instance</span><span class="special">!</span><span class="special">
|
||||
>>></span><span class="identifier"> C_str</span><span class="special">(</span><span class="identifier">c</span><span class="special">)</span><span class="identifier">
|
||||
A</span><span class="identifier"> C</span><span class="identifier"> instance</span><span class="special">!</span></tt></pre>
|
||||
<p>
|
||||
Yes, Python rox. <span class="inlinemediaobject"><img src="../images/smiley.png"></span></p>
|
||||
<p>
|
||||
We can do the same with classes that were wrapped with Boost.Python. Suppose
|
||||
we have a class <tt class="literal">point</tt> in C++:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="keyword">class</span><span class="identifier"> point</span><span class="special"> {...};</span><span class="identifier">
|
||||
|
||||
BOOST_PYTHON_MODULE</span><span class="special">(</span><span class="identifier">_geom</span><span class="special">)</span><span class="special">
|
||||
{</span><span class="identifier">
|
||||
class_</span><span class="special"><</span><span class="identifier">point</span><span class="special">>(</span><span class="string">"point"</span><span class="special">)...;</span><span class="special">
|
||||
}</span></tt></pre>
|
||||
<p>
|
||||
If we are using the technique from the previous session,
|
||||
<a href="techniques.html#python.creating_packages" title="Creating Packages">Creating Packages</a>, we can code directly
|
||||
into <tt class="literal">geom/<span class="underline">_init</span>_.py</tt>:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">from</span><span class="identifier"> _geom</span><span class="identifier"> import</span><span class="special"> *</span>
|
||||
|
||||
#<span class="identifier"> a</span><span class="identifier"> regular</span><span class="identifier"> function</span><span class="identifier">
|
||||
def</span><span class="identifier"> point_str</span><span class="special">(</span><span class="identifier">self</span><span class="special">):</span><span class="keyword">
|
||||
return</span><span class="identifier"> str</span><span class="special">((</span><span class="identifier">self</span><span class="special">.</span><span class="identifier">x</span><span class="special">,</span><span class="identifier"> self</span><span class="special">.</span><span class="identifier">y</span><span class="special">))</span>
|
||||
|
||||
#<span class="identifier"> now</span><span class="identifier"> we</span><span class="identifier"> turn</span><span class="identifier"> it</span><span class="identifier"> into</span><span class="identifier"> a</span><span class="identifier"> member</span><span class="identifier"> function</span><span class="identifier">
|
||||
point</span><span class="special">.</span><span class="identifier">__str__</span><span class="special"> =</span><span class="identifier"> point_str</span></tt></pre>
|
||||
<p><span class="bold"><b>All</b></span> point instances created from C++ will also have this member function!
|
||||
This technique has several advantages:</p>
|
||||
<div class="itemizedlist"><ul type="disc">
|
||||
<li>
|
||||
Cut down compile times to zero for these additional functions
|
||||
</li>
|
||||
<li>
|
||||
Reduce the memory footprint to virtually zero
|
||||
</li>
|
||||
<li>
|
||||
Minimize the need to recompile
|
||||
</li>
|
||||
<li>
|
||||
Rapid prototyping (you can move the code to C++ if required without changing the interface)
|
||||
</li>
|
||||
</ul></div>
|
||||
<p>
|
||||
You can even add a little syntactic sugar with the use of metaclasses. Let's
|
||||
create a special metaclass that "injects" methods in other classes.</p>
|
||||
<pre class="programlisting"><tt class="literal">
|
||||
#<span class="identifier"> The</span><span class="identifier"> one</span><span class="identifier"> Boost</span><span class="special">.</span><span class="identifier">Python</span><span class="identifier"> uses</span><span class="keyword"> for</span><span class="identifier"> all</span><span class="identifier"> wrapped</span><span class="identifier"> classes</span><span class="special">.</span>
|
||||
#<span class="identifier"> You</span><span class="identifier"> can</span><span class="identifier"> use</span><span class="identifier"> here</span><span class="identifier"> any</span><span class="keyword"> class</span><span class="identifier"> exported</span><span class="identifier"> by</span><span class="identifier"> Boost</span><span class="identifier"> instead</span><span class="identifier"> of</span><span class="string"> "point"</span><span class="identifier">
|
||||
BoostPythonMetaclass</span><span class="special"> =</span><span class="identifier"> point</span><span class="special">.</span><span class="identifier">__class__</span><span class="keyword">
|
||||
|
||||
class</span><span class="identifier"> injector</span><span class="special">(</span><span class="identifier">object</span><span class="special">):</span><span class="keyword">
|
||||
class</span><span class="identifier"> __metaclass__</span><span class="special">(</span><span class="identifier">BoostPythonMetaclass</span><span class="special">):</span><span class="identifier">
|
||||
def</span><span class="identifier"> __init__</span><span class="special">(</span><span class="identifier">self</span><span class="special">,</span><span class="identifier"> name</span><span class="special">,</span><span class="identifier"> bases</span><span class="special">,</span><span class="identifier"> dict</span><span class="special">):</span><span class="keyword">
|
||||
for</span><span class="identifier"> b</span><span class="identifier"> in</span><span class="identifier"> bases</span><span class="special">:</span><span class="keyword">
|
||||
if</span><span class="identifier"> type</span><span class="special">(</span><span class="identifier">b</span><span class="special">)</span><span class="keyword"> not</span><span class="identifier"> in</span><span class="special"> (</span><span class="identifier">self</span><span class="special">,</span><span class="identifier"> type</span><span class="special">):</span><span class="keyword">
|
||||
for</span><span class="identifier"> k</span><span class="special">,</span><span class="identifier">v</span><span class="identifier"> in</span><span class="identifier"> dict</span><span class="special">.</span><span class="identifier">items</span><span class="special">():</span><span class="identifier">
|
||||
setattr</span><span class="special">(</span><span class="identifier">b</span><span class="special">,</span><span class="identifier">k</span><span class="special">,</span><span class="identifier">v</span><span class="special">)</span><span class="keyword">
|
||||
return</span><span class="identifier"> type</span><span class="special">.</span><span class="identifier">__init__</span><span class="special">(</span><span class="identifier">self</span><span class="special">,</span><span class="identifier"> name</span><span class="special">,</span><span class="identifier"> bases</span><span class="special">,</span><span class="identifier"> dict</span><span class="special">)</span>
|
||||
|
||||
#<span class="identifier"> inject</span><span class="identifier"> some</span><span class="identifier"> methods</span><span class="identifier"> in</span><span class="identifier"> the</span><span class="identifier"> point</span><span class="identifier"> foo</span><span class="keyword">
|
||||
class</span><span class="identifier"> more_point</span><span class="special">(</span><span class="identifier">injector</span><span class="special">,</span><span class="identifier"> point</span><span class="special">):</span><span class="identifier">
|
||||
def</span><span class="identifier"> __repr__</span><span class="special">(</span><span class="identifier">self</span><span class="special">):</span><span class="keyword">
|
||||
return</span><span class="char"> 'Point(x=%s, y=%s)'</span><span class="special"> %</span><span class="special"> (</span><span class="identifier">self</span><span class="special">.</span><span class="identifier">x</span><span class="special">,</span><span class="identifier"> self</span><span class="special">.</span><span class="identifier">y</span><span class="special">)</span><span class="identifier">
|
||||
def</span><span class="identifier"> foo</span><span class="special">(</span><span class="identifier">self</span><span class="special">):</span><span class="identifier">
|
||||
print</span><span class="char"> 'foo!'</span></tt></pre>
|
||||
<p>
|
||||
Now let's see how it got:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="special">>>></span><span class="identifier"> print</span><span class="identifier"> point</span><span class="special">()</span><span class="identifier">
|
||||
Point</span><span class="special">(</span><span class="identifier">x</span><span class="special">=</span><span class="number">10</span><span class="special">,</span><span class="identifier"> y</span><span class="special">=</span><span class="number">10</span><span class="special">)</span><span class="special">
|
||||
>>></span><span class="identifier"> point</span><span class="special">().</span><span class="identifier">foo</span><span class="special">()</span><span class="identifier">
|
||||
foo</span><span class="special">!</span></tt></pre>
|
||||
<p>
|
||||
Another useful idea is to replace constructors with factory functions:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="identifier">_point</span><span class="special"> =</span><span class="identifier"> point</span><span class="identifier">
|
||||
|
||||
def</span><span class="identifier"> point</span><span class="special">(</span><span class="identifier">x</span><span class="special">=</span><span class="number">0</span><span class="special">,</span><span class="identifier"> y</span><span class="special">=</span><span class="number">0</span><span class="special">):</span><span class="keyword">
|
||||
return</span><span class="identifier"> _point</span><span class="special">(</span><span class="identifier">x</span><span class="special">,</span><span class="identifier"> y</span><span class="special">)</span></tt></pre>
|
||||
<p>
|
||||
In this simple case there is not much gained, but for constructurs with
|
||||
many overloads and/or arguments this is often a great simplification, again
|
||||
with virtually zero memory footprint and zero compile-time overhead for
|
||||
the keyword support.</p>
|
||||
</div>
|
||||
<div class="section" lang="en">
|
||||
<div class="titlepage"><div><div><h3 class="title">
|
||||
<a name="python.reducing_compiling_time"></a>Reducing Compiling Time</h3></div></div></div>
|
||||
<p>
|
||||
If you have ever exported a lot of classes, you know that it takes quite a good
|
||||
time to compile the Boost.Python wrappers. Plus the memory consumption can
|
||||
easily become too high. If this is causing you problems, you can split the
|
||||
class_ definitions in multiple files:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="comment">/* file point.cpp */</span><span class="preprocessor">
|
||||
#include</span><span class="special"> <</span><span class="identifier">point</span><span class="special">.</span><span class="identifier">h</span><span class="special">></span><span class="preprocessor">
|
||||
#include</span><span class="special"> <</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">python</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span><span class="keyword">
|
||||
|
||||
void</span><span class="identifier"> export_point</span><span class="special">()</span><span class="special">
|
||||
{</span><span class="identifier">
|
||||
class_</span><span class="special"><</span><span class="identifier">point</span><span class="special">>(</span><span class="string">"point"</span><span class="special">)...;</span><span class="special">
|
||||
}</span><span class="comment">
|
||||
|
||||
/* file triangle.cpp */</span><span class="preprocessor">
|
||||
#include</span><span class="special"> <</span><span class="identifier">triangle</span><span class="special">.</span><span class="identifier">h</span><span class="special">></span><span class="preprocessor">
|
||||
#include</span><span class="special"> <</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">python</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span><span class="keyword">
|
||||
|
||||
void</span><span class="identifier"> export_triangle</span><span class="special">()</span><span class="special">
|
||||
{</span><span class="identifier">
|
||||
class_</span><span class="special"><</span><span class="identifier">triangle</span><span class="special">>(</span><span class="string">"triangle"</span><span class="special">)...;</span><span class="special">
|
||||
}</span></tt></pre>
|
||||
<p>
|
||||
Now you create a file <tt class="literal">main.cpp</tt>, which contains the <tt class="literal">BOOST_PYTHON_MODULE</tt>
|
||||
macro, and call the various export functions inside it.</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="keyword">void</span><span class="identifier"> export_point</span><span class="special">();</span><span class="keyword">
|
||||
void</span><span class="identifier"> export_triangle</span><span class="special">();</span><span class="identifier">
|
||||
|
||||
BOOST_PYTHON_MODULE</span><span class="special">(</span><span class="identifier">_geom</span><span class="special">)</span><span class="special">
|
||||
{</span><span class="identifier">
|
||||
export_point</span><span class="special">();</span><span class="identifier">
|
||||
export_triangle</span><span class="special">();</span><span class="special">
|
||||
}</span></tt></pre>
|
||||
<p>
|
||||
Compiling and linking together all this files produces the same result as the
|
||||
usual approach:</p>
|
||||
<pre class="programlisting"><tt class="literal"><span class="preprocessor">#include</span><span class="special"> <</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">python</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span><span class="preprocessor">
|
||||
#include</span><span class="special"> <</span><span class="identifier">point</span><span class="special">.</span><span class="identifier">h</span><span class="special">></span><span class="preprocessor">
|
||||
#include</span><span class="special"> <</span><span class="identifier">triangle</span><span class="special">.</span><span class="identifier">h</span><span class="special">></span><span class="identifier">
|
||||
|
||||
BOOST_PYTHON_MODULE</span><span class="special">(</span><span class="identifier">_geom</span><span class="special">)</span><span class="special">
|
||||
{</span><span class="identifier">
|
||||
class_</span><span class="special"><</span><span class="identifier">point</span><span class="special">>(</span><span class="string">"point"</span><span class="special">)...;</span><span class="identifier">
|
||||
class_</span><span class="special"><</span><span class="identifier">triangle</span><span class="special">>(</span><span class="string">"triangle"</span><span class="special">)...;</span><span class="special">
|
||||
}</span></tt></pre>
|
||||
<p>
|
||||
but the memory is kept under control.</p>
|
||||
<p>
|
||||
This method is recommended too if you are developing the C++ library and
|
||||
exporting it to Python at the same time: changes in a class will only demand
|
||||
the compilation of a single cpp, instead of the entire wrapper code.</p>
|
||||
<div class="informaltable"><table class="table">
|
||||
<colgroup><col></colgroup>
|
||||
<tbody><tr><td>
|
||||
<span class="inlinemediaobject"><img src="../images/note.png"></span> If you're exporting your classes with <a href="../../../../../pyste/index.html" target="_top">Pyste</a>,
|
||||
take a look at the <tt class="literal">--multiple</tt> option, that generates the wrappers in
|
||||
various files as demonstrated here.</td></tr></tbody>
|
||||
</table></div>
|
||||
<div class="informaltable"><table class="table">
|
||||
<colgroup><col></colgroup>
|
||||
<tbody><tr><td>
|
||||
<span class="inlinemediaobject"><img src="../images/note.png"></span> This method is useful too if you are getting the error message
|
||||
<span class="emphasis"><em>"fatal error C1204:Compiler limit:internal structure overflow"</em></span> when compiling
|
||||
a large source file, as explained in the <a href="../../../../v2/faq.html#c1204" target="_top">FAQ</a>.</td></tr></tbody>
|
||||
</table></div>
|
||||
</div>
|
||||
</div>
|
||||
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
|
||||
<td align="left"></td>
|
||||
<td align="right"><small>Copyright © 2002-2004 Joel de Guzman, David Abrahams</small></td>
|
||||
</tr></table>
|
||||
<hr>
|
||||
<div class="spirit-nav">
|
||||
<a accesskey="p" href="exception.html"><img src="../images/prev.png" alt="Prev"></a><a accesskey="u" href="../index.html"><img src="../images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../images/home.png" alt="Home"></a>
|
||||
</div>
|
||||
</body>
|
||||
</html>
|
||||
2040
doc/tutorial/doc/tutorial.qbk
Normal file
2570
doc/tutorial/doc/tutorial.xml
Normal file
10
doc/tutorial/index.html
Normal file
@@ -0,0 +1,10 @@
|
||||
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
|
||||
<html>
|
||||
<head>
|
||||
<meta http-equiv="refresh" content="0; URL=doc/html/index.html">
|
||||
</head>
|
||||
<body>
|
||||
Automatic redirection failed, click this
|
||||
<a href="doc/html/index.html">link</a>
|
||||
</body>
|
||||
</html>
|
||||
@@ -1,61 +0,0 @@
|
||||
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.2//EN">
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
|
||||
<title>
|
||||
A Peek Under the Hood
|
||||
</title>
|
||||
<h1>
|
||||
<img src="../../../c++boost.gif" alt="c++boost.gif (8819 bytes)" align="center"
|
||||
width="277" height="86">
|
||||
</h1>
|
||||
<h1>
|
||||
A Peek Under the Hood
|
||||
</h1>
|
||||
<p>
|
||||
Declaring a <code>class_builder<T></code> causes the instantiation
|
||||
of an <code>extension_class<T></code> to which it forwards all
|
||||
member function calls and which is doing most of the real work.
|
||||
<code>extension_class<T></code> is a subclass of <code>
|
||||
PyTypeObject</code>, the <code> struct</code> which Python's 'C' API uses
|
||||
to describe a type. <a href="example1.html#world_class">An instance of the
|
||||
<code>extension_class<></code></a> becomes the Python type object
|
||||
corresponding to <code>hello::world</code>. When we <a href=
|
||||
"example1.html#add_world_class">add it to the module</a> it goes into the
|
||||
module's dictionary to be looked up under the name "world".
|
||||
<p>
|
||||
Boost.Python uses C++'s template argument deduction mechanism to determine the
|
||||
types of arguments to functions (except constructors, for which we must
|
||||
<a href="example1.html#Constructor_example">provide an argument list</a>
|
||||
because they can't be named in C++). Then, it calls the appropriate
|
||||
overloaded functions <code>PyObject*
|
||||
to_python(</code><em>S</em><code>)</code> and <em>
|
||||
S'</em><code>from_python(PyObject*,
|
||||
type<</code><em>S</em><code>>)</code> which convert between any C++
|
||||
type <em>S</em> and a <code>PyObject*</code>, the type which represents a
|
||||
reference to any Python object in its 'C' API. The <a href=
|
||||
"example1.html#world_class"><code>extension_class<T></code></a>
|
||||
template defines a whole raft of these conversions (for <code>T, T*,
|
||||
T&, std::auto_ptr<T></code>, etc.), using the same inline
|
||||
friend function technique employed by <a href="../../utility/operators.htm">the boost operators
|
||||
library</a>.
|
||||
<p>
|
||||
Because the <code>to_python</code> and <code>from_python</code> functions
|
||||
for a user-defined class are defined by <code>
|
||||
extension_class<T></code>, it is important that an instantiation of
|
||||
<code> extension_class<T></code> is visible to any code which wraps
|
||||
a C++ function with a <code>T, T*, const T&</code>, etc. parameter or
|
||||
return value. In particular, you may want to create all of the classes at
|
||||
the top of your module's init function, then <code>def</code> the member
|
||||
functions later to avoid problems with inter-class dependencies.
|
||||
<p>
|
||||
Next: <a href="building.html">Building a Module with Boost.Python</a>
|
||||
Previous: <a href="special.html">Special Method and Operator Support</a>
|
||||
Up: <a href="index.html">Top</a>
|
||||
<p>
|
||||
© Copyright David Abrahams 2000. Permission to copy, use, modify,
|
||||
sell and distribute this document is granted provided this copyright
|
||||
notice appears in all copies. This document is provided "as is" without
|
||||
express or implied warranty, and with no claim as to its suitability for
|
||||
any purpose.
|
||||
<p>
|
||||
Updated: Nov 26, 2000
|
||||
|
||||
@@ -10,10 +10,10 @@
|
||||
<tr>
|
||||
<td valign="top" width="300">
|
||||
<h3><a href="../../../../index.htm"><img height="86" width="277" alt=
|
||||
"C++ Boost" src="../../../../c++boost.gif" border="0"></a></h3>
|
||||
"C++ Boost" src="../../../../boost.png" border="0"></a></h3>
|
||||
</td>
|
||||
<td valign="top">
|
||||
<h1 align="center">Boost.Python</h1>
|
||||
<h1 align="center"><a href="../index.html">Boost.Python</a></h1>
|
||||
<h2 align="center">April 2002 Progress Report</h2>
|
||||
</td>
|
||||
</tr>
|
||||
@@ -45,7 +45,7 @@ of work got done...
|
||||
<h3><a name="arity">Arbitrary Arity Support</a></h3>
|
||||
|
||||
I began using the <a
|
||||
href="../../../preprocessor/doc/index.htm">Boost.Preprocessor</a>
|
||||
href="../../../preprocessor/doc/index.html">Boost.Preprocessor</a>
|
||||
metaprogramming library to generate support for functions and member
|
||||
functions of arbitrary arity, which was, to say the least, quite an
|
||||
adventure. The feedback cycle resulting from my foray into
|
||||
@@ -154,10 +154,10 @@ documentation).
|
||||
|
||||
<p>Revised
|
||||
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
|
||||
3 May, 2002
|
||||
13 November, 2002
|
||||
<!--webbot bot="Timestamp" endspan i-checksum="39359" -->
|
||||
</p>
|
||||
<p><i>© Copyright <a href="../../../../people/dave_abrahams.htm">Dave Abrahams</a>
|
||||
2002. All Rights Reserved.</i></p>
|
||||
2002. </i></p>
|
||||
</body>
|
||||
</html>
|
||||
|
||||
@@ -1,124 +1,152 @@
|
||||
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
|
||||
|
||||
<html>
|
||||
<head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<link rel="stylesheet" type="text/css" href="../../../boost.css">
|
||||
<title>Boost.Python - CallPolicies Concept</title>
|
||||
</head>
|
||||
<body link="#0000ff" vlink="#800080">
|
||||
<table border="0" cellpadding="7" cellspacing="0" width="100%" summary=
|
||||
<head>
|
||||
<meta name="generator" content=
|
||||
"HTML Tidy for Windows (vers 1st August 2002), see www.w3.org">
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<link rel="stylesheet" type="text/css" href=../../../../boost.css>
|
||||
|
||||
<title>Boost.Python - CallPolicies Concept</title>
|
||||
</head>
|
||||
|
||||
<body link="#0000ff" vlink="#800080">
|
||||
<table border="0" cellpadding="7" cellspacing="0" width="100%" summary=
|
||||
"header">
|
||||
<tr>
|
||||
<td valign="top" width="300">
|
||||
<h3><a href="../../../../index.htm"><img height="86" width="277" alt="C++ Boost" src="../../../../c++boost.gif" border="0"></a></h3>
|
||||
</td>
|
||||
<td valign="top">
|
||||
<h1 align="center">Boost.Python</h1>
|
||||
<h2 align="center">CallPolicies Concept</h2>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
<hr>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#introduction">Introduction</a></dt>
|
||||
<dt><a href="#composition">CallPolicies Composition</a></dt>
|
||||
<dt><a href="#concept-requirements">Concept Requirements</a></dt>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#CallPolicies-concept">CallPolicies Concept</a></dt>
|
||||
</dl>
|
||||
</dl>
|
||||
<tr>
|
||||
<td valign="top" width="300">
|
||||
<h3><a href="../../../../index.htm"><img height="86" width="277"
|
||||
alt="C++ Boost" src="../../../../boost.png" border="0"></a></h3>
|
||||
</td>
|
||||
|
||||
<h2><a name="introduction"></a>Introduction</h2>
|
||||
<td valign="top">
|
||||
<h1 align="center"><a href="../index.html">Boost.Python</a></h1>
|
||||
|
||||
<p>Models of the CallPolicies concept are used to specialize the
|
||||
behavior of Python callable objects generated by Boost.Python to
|
||||
wrapped C++ objects like function and member function
|
||||
pointers, providing three behaviors:
|
||||
<ol>
|
||||
<li> <code>precall</code> - Python argument tuple management before
|
||||
the wrapped object is invoked
|
||||
<li> <code>result_converter</code> - C++ return value handling
|
||||
<li> <code>postcall</code> - Python argument tuple and result
|
||||
management after the wrapped object is invoked
|
||||
</ol>
|
||||
<h2 align="center">CallPolicies Concept</h2>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
<hr>
|
||||
|
||||
<h2><a name="composition"></a>CallPolicies Composition</h2>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#introduction">Introduction</a></dt>
|
||||
|
||||
In order to allow the use of multiple models of CallPolicies in the
|
||||
same callable object, Boost.Python's CallPolicies class templates
|
||||
provide a chaining interface which allows them to be recursively
|
||||
composed. This interface takes the form of an optional template
|
||||
parameter, <code>Base</code> which defaults to <a
|
||||
href="default_call_policies.html#default_call_policies-spec">
|
||||
<code>default_call_policies</code></a>. By convention, the
|
||||
<code>precall</code> function of the
|
||||
<code>Base</code> is invoked <i>after</i> the <code>precall</code>
|
||||
function supplied by the outer template, and the <code>postcall</code>
|
||||
function of the <code>Base</code> is invoked <i>before</i> the
|
||||
<code>postcall</code> function of the outer template. If a
|
||||
<code>result_converter</code> is supplied by the outer template, it
|
||||
<i>replaces</i> any <code>result_converter</code> supplied by the
|
||||
<code>Base</code>. For an example, see <a
|
||||
href="return_internal_reference.html#return_internal_reference-spec">
|
||||
<code>return_internal_reference</code></a>.
|
||||
<dt><a href="#composition">CallPolicies Composition</a></dt>
|
||||
|
||||
<h2><a name="concept-requirements"></a>Concept Requirements</h2>
|
||||
<h3><a name="CallPolicies-concept"></a>CallPolicies Concept</h3>
|
||||
<dt><a href="#concept-requirements">Concept Requirements</a></dt>
|
||||
|
||||
<p>In the table below, <code><b>x</b></code> denotes an object whose
|
||||
type <code><b>P</b></code> is a model of CallPolicies,
|
||||
<code><b>a</b></code> denotes a <code>PyObject*</code> pointing to
|
||||
a Python argument tuple object, and <code><b>r</b></code> denotes a
|
||||
<code>PyObject*</code> referring to a "preliminary" result
|
||||
object.
|
||||
<dd>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#CallPolicies-concept">CallPolicies Concept</a></dt>
|
||||
</dl>
|
||||
</dd>
|
||||
</dl>
|
||||
|
||||
<table summary="CallPolicies expressions" border="1" cellpadding="5">
|
||||
<h2><a name="introduction"></a>Introduction</h2>
|
||||
|
||||
<tr>
|
||||
<td><b>Expression</b></td>
|
||||
<td><b>Type</b></td>
|
||||
<td><b>Result/Semantics</b></td>
|
||||
</tr>
|
||||
<p>Models of the CallPolicies concept are used to specialize the behavior
|
||||
of Python callable objects generated by Boost.Python to wrapped C++
|
||||
objects like function and member function pointers, providing three
|
||||
behaviors:</p>
|
||||
|
||||
<tr>
|
||||
<td valign="top"><code>x.precall(a)</code></td>
|
||||
<td>convertible to <code>bool</code>
|
||||
<td>returns <code>false</code> and <code><a
|
||||
href="http://www.python.org/doc/2.2/api/exceptionHandling.html#l2h-71">PyErr_Occurred</a>() != 0</code>
|
||||
upon failure, <code>true</code> otherwise.
|
||||
<ol>
|
||||
<li><code>precall</code> - Python argument tuple management before the
|
||||
wrapped object is invoked</li>
|
||||
|
||||
<tr>
|
||||
<td valign="top"><code>P::result_converter</code></td>
|
||||
<td>A model of <a href="ResultConverter.html#ResultConverterGenerator-concept">ResultConverterGenerator</a>.
|
||||
<td>An MPL unarymetafunction object used produce the
|
||||
"preliminary" result object.
|
||||
<li><code>result_converter</code> - C++ return value handling</li>
|
||||
|
||||
<tr>
|
||||
<td valign="top"><code>x.postcall(a, r)</code></td>
|
||||
<td>convertible to <code>PyObject*</code>
|
||||
<td>0 <code>0</code> and <code><a
|
||||
href="http://www.python.org/doc/2.2/api/exceptionHandling.html#l2h-71">PyErr_Occurred</a>() != 0</code>
|
||||
upon failure. Must "conserve references" even in the
|
||||
event of an exception. In other words, if <code>r</code> is not
|
||||
returned, its reference count must be decremented; if another
|
||||
existing object is returned, its reference count must be
|
||||
incremented.
|
||||
</table>
|
||||
<li><code>postcall</code> - Python argument tuple and result management
|
||||
after the wrapped object is invoked</li>
|
||||
</ol>
|
||||
|
||||
Models of CallPolicies are required to be <a
|
||||
href="../../../utility/CopyConstructible.html">CopyConstructible</a>.
|
||||
<h2><a name="composition"></a>CallPolicies Composition</h2>
|
||||
In order to allow the use of multiple models of CallPolicies in the same
|
||||
callable object, Boost.Python's CallPolicies class templates provide a
|
||||
chaining interface which allows them to be recursively composed. This
|
||||
interface takes the form of an optional template parameter,
|
||||
<code>Base</code> which defaults to <a href=
|
||||
"default_call_policies.html#default_call_policies-spec"><code>default_call_policies</code></a>.
|
||||
By convention, the <code>precall</code> function of the <code>Base</code>
|
||||
is invoked <i>after</i> the <code>precall</code> function supplied by the
|
||||
outer template, and the <code>postcall</code> function of the
|
||||
<code>Base</code> is invoked <i>before</i> the <code>postcall</code>
|
||||
function of the outer template. If a <code>result_converter</code> is
|
||||
supplied by the outer template, it <i>replaces</i> any
|
||||
<code>result_converter</code> supplied by the <code>Base</code>. For an
|
||||
example, see <a href=
|
||||
"return_internal_reference.html#return_internal_reference-spec"><code>return_internal_reference</code></a>.
|
||||
|
||||
|
||||
<hr>
|
||||
<p>Revised
|
||||
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
|
||||
19 May, 2002
|
||||
<h2><a name="concept-requirements"></a>Concept Requirements</h2>
|
||||
|
||||
<h3><a name="CallPolicies-concept"></a>CallPolicies Concept</h3>
|
||||
|
||||
<p>In the table below, <code><b>x</b></code> denotes an object whose type
|
||||
<code><b>P</b></code> is a model of CallPolicies, <code><b>a</b></code>
|
||||
denotes a <code>PyObject*</code> pointing to a Python argument tuple
|
||||
object, and <code><b>r</b></code> denotes a <code>PyObject*</code>
|
||||
referring to a "preliminary" result object.</p>
|
||||
|
||||
<table summary="CallPolicies expressions" border="1" cellpadding="5">
|
||||
<tr>
|
||||
<td><b>Expression</b></td>
|
||||
|
||||
<td><b>Type</b></td>
|
||||
|
||||
<td><b>Result/Semantics</b></td>
|
||||
</tr>
|
||||
|
||||
<tr>
|
||||
<td valign="top"><code>x.precall(a)</code></td>
|
||||
|
||||
<td>convertible to <code>bool</code></td>
|
||||
|
||||
<td>returns <code>false</code> and <code><a href=
|
||||
"http://www.python.org/doc/2.2/api/exceptionHandling.html#l2h-71">PyErr_Occurred</a>() != 0</code>
|
||||
upon failure, <code>true</code> otherwise.</td>
|
||||
</tr>
|
||||
|
||||
<tr>
|
||||
<td valign="top"><code>P::result_converter</code></td>
|
||||
|
||||
<td>A model of <a href=
|
||||
"ResultConverter.html#ResultConverterGenerator-concept">ResultConverterGenerator</a>.</td>
|
||||
|
||||
<td>An MPL unary <a href=
|
||||
"../../../mpl/doc/refmanual/metafunction-class.html">Metafunction
|
||||
Class</a> used produce the "preliminary" result object.</td>
|
||||
</tr>
|
||||
|
||||
<tr>
|
||||
<td valign="top"><code>x.postcall(a, r)</code></td>
|
||||
|
||||
<td>convertible to <code>PyObject*</code></td>
|
||||
|
||||
<td>0 <code>0</code> and <code><a href=
|
||||
"http://www.python.org/doc/2.2/api/exceptionHandling.html#l2h-71">PyErr_Occurred</a>() != 0</code>
|
||||
upon failure. Must "conserve references" even in the event of an
|
||||
exception. In other words, if <code>r</code> is not returned, its
|
||||
reference count must be decremented; if another existing object is
|
||||
returned, its reference count must be incremented.</td>
|
||||
</tr>
|
||||
</table>
|
||||
Models of CallPolicies are required to be <a href=
|
||||
"../../../utility/CopyConstructible.html">CopyConstructible</a>.
|
||||
<hr>
|
||||
|
||||
<p>Revised
|
||||
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
|
||||
13 November, 2002
|
||||
<!--webbot bot="Timestamp" endspan i-checksum="39359" -->
|
||||
</p>
|
||||
<p><i>© Copyright <a href="../../../../people/dave_abrahams.htm">Dave
|
||||
Abrahams</a> 2002. All Rights Reserved.</i>
|
||||
</p>
|
||||
|
||||
<p>Permission to copy, use, modify, sell
|
||||
and distribute this software is granted provided this copyright notice appears
|
||||
in all copies. This software is provided "as is" without express or implied
|
||||
warranty, and with no claim as to its suitability for any purpose.
|
||||
</body>
|
||||
<p><i>© Copyright <a href=
|
||||
"../../../../people/dave_abrahams.htm">Dave Abrahams</a> 2002.</i></p>
|
||||
|
||||
<p>Permission to copy, use, modify, sell and distribute this software is
|
||||
granted provided this copyright notice appears in all copies. This
|
||||
software is provided "as is" without express or implied warranty, and
|
||||
with no claim as to its suitability for any purpose.</p>
|
||||
</body>
|
||||
</html>
|
||||
|
||||
|
||||
@@ -1,7 +1,7 @@
|
||||
<html>
|
||||
<head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<link rel="stylesheet" type="text/css" href="../../../boost.css">
|
||||
<link rel="stylesheet" type="text/css" href=../../../../boost.css>
|
||||
<title>Boost.Python - Dereferenceable Concept</title>
|
||||
</head>
|
||||
<body link="#0000ff" vlink="#800080">
|
||||
@@ -9,10 +9,10 @@
|
||||
"header">
|
||||
<tr>
|
||||
<td valign="top" width="300">
|
||||
<h3><a href="../../../../index.htm"><img height="86" width="277" alt="C++ Boost" src="../../../../c++boost.gif" border="0"></a></h3>
|
||||
<h3><a href="../../../../index.htm"><img height="86" width="277" alt="C++ Boost" src="../../../../boost.png" border="0"></a></h3>
|
||||
</td>
|
||||
<td valign="top">
|
||||
<h1 align="center">Boost.Python</h1>
|
||||
<h1 align="center"><a href="../index.html">Boost.Python</a></h1>
|
||||
<h2 align="center">Dereferenceable Concept</h2>
|
||||
</td>
|
||||
</tr>
|
||||
@@ -28,35 +28,40 @@
|
||||
|
||||
<h2><a name="introduction"></a>Introduction</h2>
|
||||
|
||||
<p>Instances of a dereferenceable type can be used like a pointer to access an lvalue.
|
||||
<p>Instances of a Dereferenceable type can be used like a pointer to access an lvalue.
|
||||
|
||||
<h2><a name="concept-requirements"></a>Concept Requirements</h2>
|
||||
<h3><a name="Dereferenceable-concept"></a>Dereferenceable Concept</h3>
|
||||
|
||||
<p>In the table below, <code><b>x</b></code> denotes an object whose
|
||||
type is a model of Dereferenceable.
|
||||
<p>In the table below, <code><b>T</b></code> is a model of
|
||||
Dereferenceable, and <code><b>x</b></code> denotes an object of
|
||||
type <code>T</code>. In addition, all pointers are Dereferenceable.
|
||||
|
||||
<table summary="Dereferenceable expressions" border="1" cellpadding="5">
|
||||
|
||||
<tr>
|
||||
<td><b>Expression</b></td>
|
||||
<td><b>Requirements</b></td>
|
||||
<td><b>Result</b></td>
|
||||
<td><b>Operational Semantics</b></td>
|
||||
</tr>
|
||||
|
||||
<tr>
|
||||
<td valign="top"><code>*x</code></td>
|
||||
<td>An lvalue
|
||||
<td><code>get_pointer(x)</code></td>
|
||||
<td>convertible to <code><a href="pointee.html#pointee-spec">pointee</a><T>::type*</code>
|
||||
<td><code>&*x</code>, or a null pointer
|
||||
</tr>
|
||||
<tr>
|
||||
|
||||
</table>
|
||||
|
||||
<hr>
|
||||
<p>Revised
|
||||
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
|
||||
10 May, 2002
|
||||
18 December, 2003
|
||||
<!--webbot bot="Timestamp" endspan i-checksum="39359" -->
|
||||
</p>
|
||||
<p><i>© Copyright <a href="../../../../people/dave_abrahams.htm">Dave
|
||||
Abrahams</a> 2002. All Rights Reserved.</i>
|
||||
Abrahams</a> 2002-2003. </i>
|
||||
|
||||
<p>Permission to copy, use, modify, sell
|
||||
and distribute this software is granted provided this copyright notice appears
|
||||
|
||||
@@ -1,7 +1,7 @@
|
||||
<html>
|
||||
<head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<link rel="stylesheet" type="text/css" href="../../../boost.css">
|
||||
<link rel="stylesheet" type="text/css" href=../../../../boost.css>
|
||||
<title>Boost.Python - Extractor Concept</title>
|
||||
</head>
|
||||
<body link="#0000ff" vlink="#800080">
|
||||
@@ -9,10 +9,10 @@
|
||||
"header">
|
||||
<tr>
|
||||
<td valign="top" width="300">
|
||||
<h3><a href="../../../../index.htm"><img height="86" width="277" alt="C++ Boost" src="../../../../c++boost.gif" border="0"></a></h3>
|
||||
<h3><a href="../../../../index.htm"><img height="86" width="277" alt="C++ Boost" src="../../../../boost.png" border="0"></a></h3>
|
||||
</td>
|
||||
<td valign="top">
|
||||
<h1 align="center">Boost.Python</h1>
|
||||
<h1 align="center"><a href="../index.html">Boost.Python</a></h1>
|
||||
<h2 align="center">Extractor Concept</h2>
|
||||
</td>
|
||||
</tr>
|
||||
@@ -79,11 +79,11 @@ are layout-compatible with PyObject.
|
||||
<hr>
|
||||
<p>Revised
|
||||
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
|
||||
22 May, 2002
|
||||
13 November, 2002
|
||||
<!--webbot bot="Timestamp" endspan i-checksum="39359" -->
|
||||
</p>
|
||||
<p><i>© Copyright <a href="../../../../people/dave_abrahams.htm">Dave
|
||||
Abrahams</a> 2002. All Rights Reserved.</i>
|
||||
Abrahams</a> 2002. </i>
|
||||
|
||||
<p>Permission to copy, use, modify, sell
|
||||
and distribute this software is granted provided this copyright notice appears
|
||||
|
||||
@@ -1,7 +1,7 @@
|
||||
<html>
|
||||
<head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<link rel="stylesheet" type="text/css" href="../../../boost.css">
|
||||
<link rel="stylesheet" type="text/css" href=../../../../boost.css>
|
||||
<title>Boost.Python - Holder Concept</title>
|
||||
</head>
|
||||
<body link="#0000ff" vlink="#800080">
|
||||
@@ -9,10 +9,10 @@
|
||||
"header">
|
||||
<tr>
|
||||
<td valign="top" width="300">
|
||||
<h3><a href="../../../../index.htm"><img height="86" width="277" alt="C++ Boost" src="../../../../c++boost.gif" border="0"></a></h3>
|
||||
<h3><a href="../../../../index.htm"><img height="86" width="277" alt="C++ Boost" src="../../../../boost.png" border="0"></a></h3>
|
||||
</td>
|
||||
<td valign="top">
|
||||
<h1 align="center">Boost.Python</h1>
|
||||
<h1 align="center"><a href="../index.html">Boost.Python</a></h1>
|
||||
<h2 align="center">HolderGenerator Concept</h2>
|
||||
</td>
|
||||
</tr>
|
||||
@@ -57,11 +57,11 @@ type.
|
||||
<hr>
|
||||
<p>Revised
|
||||
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
|
||||
20 May, 2002
|
||||
13 November, 2002
|
||||
<!--webbot bot="Timestamp" endspan i-checksum="39359" -->
|
||||
</p>
|
||||
<p><i>© Copyright <a href="../../../../people/dave_abrahams.htm">Dave
|
||||
Abrahams</a> 2002. All Rights Reserved.</i>
|
||||
Abrahams</a> 2002. </i>
|
||||
|
||||
<p>Permission to copy, use, modify, sell
|
||||
and distribute this software is granted provided this copyright notice appears
|
||||
|
||||
@@ -10,10 +10,10 @@
|
||||
<tr>
|
||||
<td valign="top" width="300">
|
||||
<h3><a href="../../../../index.htm"><img height="86" width="277" alt=
|
||||
"C++ Boost" src="../../../../c++boost.gif" border="0"></a></h3>
|
||||
"C++ Boost" src="../../../../boost.png" border="0"></a></h3>
|
||||
</td>
|
||||
<td valign="top">
|
||||
<h1 align="center">Boost.Python</h1>
|
||||
<h1 align="center"><a href="../index.html">Boost.Python</a></h1>
|
||||
<h2 align="center">June 2002 Progress Report</h2>
|
||||
</td>
|
||||
</tr>
|
||||
@@ -217,10 +217,10 @@ you'll just have to wait till next month (hopefully the beginning).
|
||||
|
||||
<p>Revised
|
||||
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
|
||||
19 July, 2002
|
||||
13 November, 2002
|
||||
<!--webbot bot="Timestamp" endspan i-checksum="39359" -->
|
||||
</p>
|
||||
<p><i>© Copyright <a href="../../../../people/dave_abrahams.htm">Dave Abrahams</a>
|
||||
2002. All Rights Reserved.</i></p>
|
||||
2002. </i></p>
|
||||
</body>
|
||||
</html>
|
||||
|
||||
@@ -10,10 +10,10 @@
|
||||
<tr>
|
||||
<td valign="top" width="300">
|
||||
<h3><a href="../../../../index.htm"><img height="86" width="277" alt=
|
||||
"C++ Boost" src="../../../../c++boost.gif" border="0"></a></h3>
|
||||
"C++ Boost" src="../../../../boost.png" border="0"></a></h3>
|
||||
</td>
|
||||
<td valign="top">
|
||||
<h1 align="center">Boost.Python</h1>
|
||||
<h1 align="center"><a href="../index.html">Boost.Python</a></h1>
|
||||
<h2 align="center">March 2002 Progress Report</h2>
|
||||
</td>
|
||||
</tr>
|
||||
@@ -225,10 +225,10 @@ worth doing anything about it.
|
||||
|
||||
<p>Revised
|
||||
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
|
||||
1 April, 2002
|
||||
13 November, 2002
|
||||
<!--webbot bot="Timestamp" endspan i-checksum="39359" -->
|
||||
</p>
|
||||
<p><i>© Copyright <a href="../../../../people/dave_abrahams.htm">Dave Abrahams</a>
|
||||
2002. All Rights Reserved.</i></p>
|
||||
2002. </i></p>
|
||||
</body>
|
||||
</html>
|
||||
|
||||
@@ -10,10 +10,10 @@
|
||||
<tr>
|
||||
<td valign="top" width="300">
|
||||
<h3><a href="../../../../index.htm"><img height="86" width="277" alt=
|
||||
"C++ Boost" src="../../../../c++boost.gif" border="0"></a></h3>
|
||||
"C++ Boost" src="../../../../boost.png" border="0"></a></h3>
|
||||
</td>
|
||||
<td valign="top">
|
||||
<h1 align="center">Boost.Python</h1>
|
||||
<h1 align="center"><a href="../index.html">Boost.Python</a></h1>
|
||||
<h2 align="center">May 2002 Progress Report</h2>
|
||||
</td>
|
||||
</tr>
|
||||
@@ -54,7 +54,7 @@ focused on reducing the support burden. In recent weeks, responding to
|
||||
requests for support, espcially surrounding building the library, had
|
||||
begun to impede progress on development. There was a major push to
|
||||
release a stable 1.28.0 of Boost, including documentation of <a
|
||||
href="../../../../tools/build/index.html">Boost.Build</a> and specific
|
||||
href="../../../../tools/build/v1/build_system.htm">Boost.Build</a> and specific
|
||||
<a href="../building.html">instructions</a> for building Boost.Python
|
||||
v1. The documentation for Boost.Python v2 was also updated as
|
||||
described <a href="#documentation">here</a>.
|
||||
@@ -70,7 +70,7 @@ described <a href="#documentation">here</a>.
|
||||
Martin Casado which uncovered the key mechanism required to allow
|
||||
shared libraries to use functions from the Python executable. The
|
||||
current solution used in Boost.Build relies on a <a
|
||||
href="../../../../tools/build/gen_aix_import_file.py">Python
|
||||
href="../../../../tools/build/v1/gen_aix_import_file.py">Python
|
||||
Script</a> as part of the build process. This is not a problem for
|
||||
Boost.Python, as Python will be available. However, the commands
|
||||
issued by the script are so simple that a 100%-pure-Boost.Jam
|
||||
@@ -84,8 +84,7 @@ described <a href="#documentation">here</a>.
|
||||
|
||||
Support for exposing C++ operators and functions as the corresponding
|
||||
Python special methods was added. Thinking that the Boost.Python
|
||||
<a href="../special.html#numeric">v1 interface</a> was a little too
|
||||
esoteric (especially the use of
|
||||
v1 interface was a little too esoteric (especially the use of
|
||||
<code>left_operand<...>/right_operand<...></code> for
|
||||
asymmetric operands), I introduced a simple form of <a
|
||||
href="http://osl.iu.edu/~tveldhui/papers/Expression-Templates/exprtmpl.html">expression
|
||||
@@ -155,7 +154,7 @@ This forced the exposure of the <a
|
||||
href="http://www.python.org/2.2/descrintro.html#property"><code>property</code></a>
|
||||
interface used internally to implement the data member exposure
|
||||
facility described in <a
|
||||
href="Mar2002#data_members">March</a>. Properties are an
|
||||
href="Mar2002.html#data_members">March</a>. Properties are an
|
||||
incredibly useful idiom, so it's good to be able to provide them
|
||||
at little new development cost.
|
||||
|
||||
@@ -212,7 +211,7 @@ Major updates were made to the following pages:
|
||||
|
||||
<blockquote>
|
||||
<dl>
|
||||
<dt><a href="call.html">call.html</a><dd> <dt><a href="updated">updated</a><dd>
|
||||
<dt><a href="call.html">call.html</a><dd> <dt>updated<dd>
|
||||
<dt><a href="class.html">class.html</a><dd>
|
||||
<dt><a href="reference.html">reference.html</a><dd>
|
||||
</dl>
|
||||
@@ -300,10 +299,10 @@ to these issues will probably have to be formalized before long.
|
||||
|
||||
<p>Revised
|
||||
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
|
||||
11 June, 2002
|
||||
13 November, 2002
|
||||
<!--webbot bot="Timestamp" endspan i-checksum="39359" -->
|
||||
</p>
|
||||
<p><i>© Copyright <a href="../../../../people/dave_abrahams.htm">Dave Abrahams</a>
|
||||
2002. All Rights Reserved.</i></p>
|
||||
2002. </i></p>
|
||||
</body>
|
||||
</html>
|
||||
|
||||
150
doc/v2/ObjectWrapper.html
Normal file
@@ -0,0 +1,150 @@
|
||||
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
|
||||
|
||||
<html>
|
||||
<head>
|
||||
<meta name="generator" content=
|
||||
"HTML Tidy for Windows (vers 1st August 2002), see www.w3.org">
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<link rel="stylesheet" type="text/css" href="../boost.css">
|
||||
|
||||
<title>Boost.Python - ObjectWrapper Concept</title>
|
||||
</head>
|
||||
|
||||
<body link="#0000ff" vlink="#800080">
|
||||
<table border="0" cellpadding="7" cellspacing="0" width="100%" summary=
|
||||
"header">
|
||||
<tr>
|
||||
<td valign="top" width="300">
|
||||
<h3><a href="../../../../index.htm"><img height="86" width="277"
|
||||
alt="C++ Boost" src="../../../../boost.png" border="0"></a></h3>
|
||||
</td>
|
||||
|
||||
<td valign="top">
|
||||
<h1 align="center"><a href="../index.html">Boost.Python</a></h1>
|
||||
|
||||
<h2 align="center">ObjectWrapper and TypeWrapper Concepts</h2>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
<hr>
|
||||
|
||||
<dl class="page-index">
|
||||
<dt><a href="#introduction">Introduction</a></dt>
|
||||
|
||||
<dt><a href="#concept-requirements">Concept Requirements</a></dt>
|
||||
|
||||
<dd>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#ObjectWrapper-concept">ObjectWrapper Concept</a></dt>
|
||||
|
||||
<dt><a href="#TypeWrapper-concept">TypeWrapper Concept</a></dt>
|
||||
</dl>
|
||||
</dd>
|
||||
|
||||
<dt><a href="#caveat">Caveat</a></dt>
|
||||
</dl>
|
||||
|
||||
<h2><a name="introduction"></a>Introduction</h2>
|
||||
|
||||
<p>This page defines two concepts used to describe classes which manage a
|
||||
Python objects, and which are intended to support usage with a
|
||||
Python-like syntax.</p>
|
||||
|
||||
<h2><a name="concept-requirements"></a>Concept Requirements</h2>
|
||||
|
||||
<h3><a name="ObjectWrapper-concept"></a>ObjectWrapper Concept</h3>
|
||||
Models of the ObjectWrapper concept have <a href=
|
||||
"object.html#object-spec">object</a> as a publicly-accessible base class,
|
||||
and are used to supply special construction behavior and/or additional
|
||||
convenient functionality through (often templated) member functions.
|
||||
Except when the return type <code>R</code> is itself an <a href=
|
||||
"#TypeWrapper-concept">TypeWrapper</a>, a member function invocation of
|
||||
the form
|
||||
<pre>
|
||||
x.<i>some_function</i>(<i>a<small>1</small>, a<small>2</small>,...a<small>n</small></i>)
|
||||
</pre>
|
||||
always has semantics equivalent to:
|
||||
<pre>
|
||||
<a href=
|
||||
"extract.html#extract-spec">extract</a><R>(x.attr("<i>some_function</i>")(<a
|
||||
href=
|
||||
"object.html#object-spec-ctors">object</a>(<i>a<small>1</small></i>), <a
|
||||
href=
|
||||
"object.html#object-spec-ctors">object</a>(<i>a<small>2</small></i>),...<a
|
||||
href="object.html#object-spec-ctors">object</a>(<i>a<small>n</small></i>)))()
|
||||
</pre>
|
||||
When the <code>R</code> is an <a href=
|
||||
"#TypeWrapper-concept">TypeWrapper</a>, the result type may be
|
||||
constructed by taking direct posession of:
|
||||
<pre>
|
||||
x.attr("<i>some_function</i>")(<a href=
|
||||
"object.html#object-spec-ctors">object</a>(<i>a<small>1</small></i>), <a
|
||||
href=
|
||||
"object.html#object-spec-ctors">object</a>(<i>a<small>2</small></i>),...<a
|
||||
href=
|
||||
"object.html#object-spec-ctors">object</a>(<i>a<small>n</small></i>)).ptr()
|
||||
</pre>
|
||||
[see <a href="#caveat">caveat</a> below]
|
||||
|
||||
<h3><a name="TypeWrapper-concept"></a>TypeWrapper Concept</h3>
|
||||
TypeWrapper is a refinement of ObjectWrapper which is associated with a
|
||||
particular Python type <code>X</code>. For a given TypeWrapper
|
||||
<code>T</code>, a valid constructor expression
|
||||
<pre>
|
||||
T(<i>a<small>1</small>, a<small>2</small>,...a<small>n</small></i>)
|
||||
</pre>
|
||||
builds a new <code>T</code> object managing the result of invoking
|
||||
<code>X</code> with arguments corresponding to
|
||||
<pre>
|
||||
<a href=
|
||||
"object.html#object-spec-ctors">object</a>(<i>a<small>1</small></i>), <a
|
||||
href=
|
||||
"object.html#object-spec-ctors">object</a>(<i>a<small>2</small></i>),...<a
|
||||
href=
|
||||
"object.html#object-spec-ctors">object</a>(<i>a<small>n</small></i>)
|
||||
</pre>
|
||||
|
||||
When used as arguments to wrapped C++ functions, or as the template
|
||||
parameter to <code><a
|
||||
href="extract.html#extract-spec">extract</a><></code>, only
|
||||
instances of the associated Python type will be considered a match.
|
||||
|
||||
<h3><a name="caveat">Caveat</a></h3>
|
||||
The upshot of the special member function invocation rules when the
|
||||
return type is a TypeWrapper is that it is possible for the returned
|
||||
object to manage a Python object of an inappropriate type. This is not
|
||||
usually a serious problem; the worst-case result is that errors will be
|
||||
detected at runtime a little later than they might otherwise be. For an
|
||||
example of how this can occur, note that the <code><a href=
|
||||
"dict.html#dict-spec">dict</a></code> member function <code>items</code>
|
||||
returns an object of type <code><a href=
|
||||
"list.html#list-spec">list</a></code>. Now suppose the user defines this
|
||||
<code>dict</code> subclass in Python:
|
||||
<pre>
|
||||
>>> class mydict(dict):
|
||||
... def items(self):
|
||||
... return tuple(dict.items(self)) # return a tuple
|
||||
</pre>
|
||||
Since an instance of <code>mydict</code> is also an instance of
|
||||
<code>dict</code>, when used as an argument to a wrapped C++ function,
|
||||
<code><a href="dict.html#dict-spec">boost::python::dict</a></code> can
|
||||
accept objects of Python type <code>mydict</code>. Invoking
|
||||
<code>items()</code> on this object can result in an instance of <code><a
|
||||
href="list.html#list-spec">boost::python::list</a></code> which actually
|
||||
holds a Python tuple. Subsequent attempts to use list methods (e.g.
|
||||
<code>append</code>, or any other mutating operation) on this object will
|
||||
raise the same exception that would occur if you tried to do it from
|
||||
Python.
|
||||
<hr>
|
||||
|
||||
<p>Revised
|
||||
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
|
||||
13 November, 2002
|
||||
<!--webbot bot="Timestamp" endspan i-checksum="39359" -->
|
||||
</p>
|
||||
|
||||
<p><i>© Copyright <a href=
|
||||
"../../../../people/dave_abrahams.htm">Dave Abrahams</a> 2002.</i></p>
|
||||
</body>
|
||||
</html>
|
||||
|
||||
@@ -1,7 +1,7 @@
|
||||
<html>
|
||||
<head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<link rel="stylesheet" type="text/css" href="../../../boost.css">
|
||||
<link rel="stylesheet" type="text/css" href=../../../../boost.css>
|
||||
<title>Boost.Python - ResultConverter Concept</title>
|
||||
</head>
|
||||
<body link="#0000ff" vlink="#800080">
|
||||
@@ -9,10 +9,10 @@
|
||||
"header">
|
||||
<tr>
|
||||
<td valign="top" width="300">
|
||||
<h3><a href="../../../../index.htm"><img height="86" width="277" alt="C++ Boost" src="../../../../c++boost.gif" border="0"></a></h3>
|
||||
<h3><a href="../../../../index.htm"><img height="86" width="277" alt="C++ Boost" src="../../../../boost.png" border="0"></a></h3>
|
||||
</td>
|
||||
<td valign="top">
|
||||
<h1 align="center">Boost.Python</h1>
|
||||
<h1 align="center"><a href="../index.html">Boost.Python</a></h1>
|
||||
<h2 align="center">ResultConverter Concept</h2>
|
||||
</td>
|
||||
</tr>
|
||||
@@ -100,7 +100,7 @@ C++ function return type.
|
||||
<!--webbot bot="Timestamp" endspan i-checksum="39359" -->
|
||||
</p>
|
||||
<p><i>© Copyright <a href="../../../../people/dave_abrahams.htm">Dave
|
||||
Abrahams</a> 2002. All Rights Reserved.</i>
|
||||
Abrahams</a> 2002. </i>
|
||||
|
||||
<p>Permission to copy, use, modify, sell
|
||||
and distribute this software is granted provided this copyright notice appears
|
||||
|
||||
@@ -1,32 +1,132 @@
|
||||
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
|
||||
|
||||
<html>
|
||||
<head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<link rel="stylesheet" type="text/css" href="../boost.css">
|
||||
<title>Boost.Python - Acknowledgments</title>
|
||||
</head>
|
||||
<body link="#0000ff" vlink="#800080">
|
||||
<table border="0" cellpadding="7" cellspacing="0" width="100%" summary=
|
||||
<head>
|
||||
<meta name="generator" content=
|
||||
"HTML Tidy for Windows (vers 1st August 2002), see www.w3.org">
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<link rel="stylesheet" type="text/css" href="../boost.css">
|
||||
|
||||
<title>Boost.Python - Acknowledgments</title>
|
||||
</head>
|
||||
|
||||
<body link="#0000ff" vlink="#800080">
|
||||
<table border="0" cellpadding="7" cellspacing="0" width="100%" summary=
|
||||
"header">
|
||||
<tr>
|
||||
<td valign="top" width="300">
|
||||
<h3><a href="../../../../index.htm"><img height="86" width="277" alt=
|
||||
"C++ Boost" src="../../../../c++boost.gif" border="0"></a></h3>
|
||||
</td>
|
||||
<td valign="top">
|
||||
<h1 align="center">Boost.Python</h1>
|
||||
<h2 align="center">Acknowledgments</h2>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
<hr>
|
||||
{{text}}
|
||||
<hr>
|
||||
<p>Revised
|
||||
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
|
||||
05 November, 2002
|
||||
<!--webbot bot="Timestamp" endspan i-checksum="39359" -->
|
||||
</p>
|
||||
<p><i>© Copyright <a href="../../../../people/dave_abrahams.htm">Dave Abrahams</a>
|
||||
2002. All Rights Reserved.</i></p>
|
||||
</body>
|
||||
<tr>
|
||||
<td valign="top" width="300">
|
||||
<h3><a href="../../../../index.htm"><img height="86" width="277"
|
||||
alt="C++ Boost" src="../../../../boost.png" border="0"></a></h3>
|
||||
</td>
|
||||
|
||||
<td valign="top">
|
||||
<h1 align="center"><a href="../index.html">Boost.Python</a></h1>
|
||||
|
||||
<h2 align="center">Acknowledgments</h2>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
<hr>
|
||||
|
||||
<p><a href="../../../../people/dave_abrahams.htm">Dave Abrahams</a> is
|
||||
the architect, designer, and implementor of <b>Boost.Python</b>.</p>
|
||||
|
||||
<p><a href="mailto:brett.calcott@paradise.net.nz">Brett Calcott</a>
|
||||
contributed and maintains the Visual Studio project files and
|
||||
documentation.</p>
|
||||
|
||||
<p><a href="mailto:Gottfried.Ganssauge-at-haufe.de">Gottfried
|
||||
Ganßauge</a> supplied support for opaque pointer conversions,
|
||||
complete with documentation and a regression test (and I didn't
|
||||
even have to ask him for those)!
|
||||
|
||||
<p>Joel de Guzman implemented the <a href="overloads.html">default
|
||||
argument support</a> and wrote the excellent <a href=
|
||||
"../tutorial/index.html">tutorial documentation</a>.</p>
|
||||
|
||||
<p><a href="../../../../people/ralf_w_grosse_kunstleve.htm">Ralf W.
|
||||
Grosse-Kunstleve</a> implemented the <a href="pickle.html">pickle
|
||||
support</a>, and has enthusiastically supported the library since its
|
||||
birth, contributing to design decisions and providing invaluable
|
||||
real-world insight into user requirements. Ralf has written some <a href=
|
||||
"faq.html#question2">extensions</a> for converting C++ containers that I
|
||||
hope will be incorporated into the library soon. He also implemented the
|
||||
cross-module support in the first version of Boost.Python. More
|
||||
importantly, Ralf makes sure nobody forgets the near-perfect synergy of
|
||||
C++ and Python for solving the problems of large-scale software
|
||||
construction.</p>
|
||||
|
||||
<p><a href="../../../../people/aleksey_gurtovoy.htm">Aleksey Gurtovoy</a>
|
||||
wrote an incredible C++ <a href="http://www.mywikinet.com/mpl">Template
|
||||
Metaprogramming Library</a> which allows Boost.Python to perform much of
|
||||
its compile-time magic. In addition, Aleksey very generously contributed
|
||||
his time and deep knowledge of the quirks of various buggy compilers to
|
||||
help us get around problems at crucial moments.</p>
|
||||
|
||||
<p><a href="../../../../people/paul_mensonides.htm">Paul Mensonides</a>,
|
||||
building on the work <a href="../../../../people/vesa_karvonen.htm">Vesa
|
||||
Karvonen</a>, wrote a similarly amazing <a href=
|
||||
"../../../preprocessor/doc/index.html">Preprocessor Metaprogramming
|
||||
Library</a>, and generously contributed the time and expertise to get it
|
||||
working in the Boost.Python library, rewriting much of Boost.Python to
|
||||
use the new preproccessor metaprogramming constructs and helping us to
|
||||
work around buggy and slow C++ preprocessors.</p>
|
||||
|
||||
<p><a href="mailto:nicodemus-at-globalite.com.br">Bruno da Silva de
|
||||
Oliveira</a> contributed the ingenious <a
|
||||
href="../../pyste/index.html">Pyste</a> ("Pie-Steh")
|
||||
code generator.
|
||||
|
||||
<p><a href="mailto:nickm@sitius.com">Nikolay Mladenov</a> contributed
|
||||
<code>staticmethod</code> support.</p>
|
||||
|
||||
<p>Martin Casado solved some sticky problems which allow us to build the
|
||||
Boost.Python shared library for AIX's crazy dynamic linking model.</p>
|
||||
|
||||
<p><a href="mailto:achim@procoders.net">Achim Domma</a> contributed some
|
||||
of the <a href="reference.html#object_wrappers">Object Wrappers</a> and
|
||||
HTML templates for this documentation. Dave Hawkes contributed
|
||||
inspiration for the use of the <code><a href=
|
||||
"scope.html#scope-spec">scope</a></code> class to simplify module
|
||||
definition syntax. Pearu Pearson wrote some of the test cases that are in
|
||||
the current test suite.</p>
|
||||
|
||||
<p>The development of this version of Boost.Python was funded in part by
|
||||
the <a href="http://www.llnl.gov/">Lawrence Livermore National
|
||||
Laboratories</a> and by the <a href="http://cci.lbl.gov/">Computational
|
||||
Crystallography Initiative</a> at Lawrence Berkeley National
|
||||
Laboratories.</p>
|
||||
|
||||
<p><a href="http://kogs-www.informatik.uni-hamburg.de/~koethe/">Ullrich
|
||||
Koethe</a> had independently developed a similar system. When he
|
||||
discovered Boost.Python v1, he generously contributed countless hours of
|
||||
coding and much insight into improving it. He is responsible for an early
|
||||
version of the support for function overloading and wrote the support for
|
||||
reflecting C++ inheritance relationships. He has helped to improve
|
||||
error-reporting from both Python and C++ (we hope to do as well in v2
|
||||
again soon), and has designed the original support for exposing numeric
|
||||
operators, including a way to avoid explicit coercion by means of
|
||||
overloading.</p>
|
||||
|
||||
<p>The members of the boost mailing list and the Python community
|
||||
supplied invaluable early feedback. In particular, Ron Clarke, Mark
|
||||
Evans, Anton Gluck, Chuck Ingold, Prabhu Ramachandran, and Barry Scott
|
||||
took the brave step of trying to use Boost.Python while it was still in
|
||||
early stages of development.</p>
|
||||
|
||||
<p>The first version of Boost.Python would not have been possible without
|
||||
the support of Dragon Systems, which supported its development and
|
||||
release as a Boost library.</p>
|
||||
<hr>
|
||||
|
||||
<p>Revised
|
||||
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
|
||||
26 November, 2002
|
||||
<!--webbot bot="Timestamp" endspan i-checksum="39359" -->
|
||||
</p>
|
||||
|
||||
<p><i>© Copyright <a href=
|
||||
"../../../../people/dave_abrahams.htm">Dave Abrahams</a> 2002.</i></p>
|
||||
</body>
|
||||
</html>
|
||||
|
||||
|
||||
196
doc/v2/args.html
Normal file
@@ -0,0 +1,196 @@
|
||||
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
|
||||
|
||||
<html>
|
||||
<head>
|
||||
<meta name="generator" content=
|
||||
"HTML Tidy for Cygwin (vers 1st April 2002), see www.w3.org">
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<link rel="stylesheet" type="text/css" href="../boost.css">
|
||||
|
||||
<title>Boost.Python - <boost/python/args.hpp></title>
|
||||
</head>
|
||||
|
||||
<body>
|
||||
<table border="0" cellpadding="7" cellspacing="0" width="100%" summary=
|
||||
"header">
|
||||
<tr>
|
||||
<td valign="top" width="300">
|
||||
<h3><a href="../../../../index.htm"><img height="86" width="277"
|
||||
alt="C++ Boost" src="../../../../boost.png" border="0"></a></h3>
|
||||
</td>
|
||||
|
||||
<td valign="top">
|
||||
<h1 align="center"><a href="../index.html">Boost.Python</a></h1>
|
||||
|
||||
<h2 align="center">Header <boost/python/args.hpp></h2>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
<hr>
|
||||
|
||||
<h2>Contents</h2>
|
||||
|
||||
<dl class="page-index">
|
||||
<dt><a href="#introduction">Introduction</a></dt>
|
||||
|
||||
<dt><a href="#keyword-expression"><i>keyword-expressions</i></a></dt>
|
||||
|
||||
<dt><a href="#classes">Classes</a></dt>
|
||||
|
||||
<dd>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#arg-spec">class <code>arg</code></a></dt>
|
||||
|
||||
<dd>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#arg-synopsis">class <code>arg</code>
|
||||
synopsis</a></dt>
|
||||
|
||||
<dt><a href="#arg-ctor">class <code>arg</code>
|
||||
constructor</a></dt>
|
||||
|
||||
<dt><a href="#arg-operator">class <code>arg</code> template
|
||||
<code>operator =</code></a></dt>
|
||||
</dl>
|
||||
</dd>
|
||||
</dl>
|
||||
</dd>
|
||||
|
||||
<dt><a href="#keyword-expression-operators"><i>Keyword-expression</i>
|
||||
operator <code>,</code></a></dt>
|
||||
|
||||
<dt><a href="#functions">Functions (deprecated)</a></dt>
|
||||
|
||||
<dd>
|
||||
<dl class="page-index">
|
||||
<dt><code><a href=
|
||||
"#args-spec">args</a>(</code>...<code>)</code></dt>
|
||||
</dl>
|
||||
</dd>
|
||||
|
||||
<dt><a href="#examples">Example(s)</a></dt>
|
||||
</dl>
|
||||
<hr>
|
||||
|
||||
<h2><a name="introduction"></a>Introduction</h2>
|
||||
|
||||
<p>Supplies a family of overloaded functions for specifying argument
|
||||
keywords for wrapped C++ functions.</p>
|
||||
|
||||
<h2><a name="keyword-expression"></a><i>keyword-expressions</i></h2>
|
||||
|
||||
<p>A <b>keyword-expression</b> results in an object which holds a
|
||||
sequence of <a href="definitions.html#ntbs">ntbs</a>es, and whose type
|
||||
encodes the number of keywords specified. The <b>keyword-expression</b>
|
||||
may contain default values for some or all of the keywords it holds</p>
|
||||
|
||||
<h2><a name="classes"></a>Classes</h2>
|
||||
|
||||
<h3><a name="arg-spec"></a><code>class arg;</code></h3>
|
||||
|
||||
<p>The objects of class arg are keyword-expressions holding one keyword (
|
||||
size one )</p>
|
||||
|
||||
<h4><a name="arg-synopsis"></a>Class <code>arg</code> synopsis</h4>
|
||||
<pre>
|
||||
namespace boost { namespace python
|
||||
{
|
||||
struct arg
|
||||
{
|
||||
template <class T>
|
||||
arg &perator = (T const &value);
|
||||
explicit arg (char const *name){elements[0].name = name;}
|
||||
};
|
||||
|
||||
}}
|
||||
</pre>
|
||||
|
||||
<h4><a name="arg-ctor"></a>Class <code>arg</code> constructor</h4>
|
||||
<pre>
|
||||
arg(char const* name);
|
||||
</pre>
|
||||
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Requires:</b> The argument must be a <a href=
|
||||
"definitions.html#ntbs">ntbs</a>.</dt>
|
||||
|
||||
<dt><b>Effects:</b> Constructs an <code>arg</code> object holding a
|
||||
keyword with name <code>name</code>.</dt>
|
||||
</dl>
|
||||
|
||||
<h4><a name="arg-operator"></a>Class <code>arg</code> operator =</h4>
|
||||
<pre>
|
||||
template <class T> arg &operator = (T const &value);
|
||||
</pre>
|
||||
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Requires:</b> The argument must convertible to python.</dt>
|
||||
|
||||
<dt><b>Effects:</b> Assigns default value for the keyword.</dt>
|
||||
|
||||
<dt><b>Returns:</b> Reference to <code>this</code>.</dt>
|
||||
</dl>
|
||||
|
||||
<h2><a name="keyword-expression-operators"><i>Keyword-expression</i>
|
||||
operator <code>,</code></a></h2>
|
||||
<pre>
|
||||
<i>keyword-expression</i> operator , (<i>keyword-expression</i>, const arg &kw) const
|
||||
<i>keyword-expression</i> operator , (<i>keyword-expression</i>, const char *name) const;
|
||||
</pre>
|
||||
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Requires:</b> The argument <code>name</code> must be a <a href=
|
||||
"definitions.html#ntbs">ntbs</a>.</dt>
|
||||
|
||||
<dt><b>Effects:</b> Extends the <i>keyword-expression</i> argument with
|
||||
one more keyword.</dt>
|
||||
|
||||
<dt><b>Returns:</b> The extended <i>keyword-expression</i>.</dt>
|
||||
</dl>
|
||||
|
||||
<h2><font color="#7F7F7F"><a name="functions"></a>Functions
|
||||
(deprecated)</font></h2>
|
||||
|
||||
<h3><a name="args-spec"></a><code><font color=
|
||||
"#7F7F7F">args</font>(</code>...<code>)</code></h3>
|
||||
<pre>
|
||||
<font color="#7F7F7F"> <i>unspecified1</i> args(char const*);
|
||||
<i>unspecified2</i> args(char const*, char const*);
|
||||
.
|
||||
.
|
||||
.
|
||||
<i>unspecifiedN</i> args(char const*, char const*, ... char const*);
|
||||
</font>
|
||||
</pre>
|
||||
|
||||
<dl class="function-semantics">
|
||||
<dt><font color="#7F7F7F"><b>Requires:</b> Every argument must be a <a
|
||||
href="definitions.html#ntbs">ntbs</a>.</font></dt>
|
||||
|
||||
<dt><font color="#7F7F7F"><b>Returns:</b> an object representing a <a
|
||||
href="#keyword-expression"><i>keyword-expression</i></a> encapsulating
|
||||
the arguments passed.</font></dt>
|
||||
</dl>
|
||||
|
||||
<h2><a name="examples"></a>Example</h2>
|
||||
<pre>
|
||||
#include <boost/python/def.hpp>
|
||||
using namespace boost::python;
|
||||
|
||||
int f(double x, double y, double z=0.0, double w=1.0);
|
||||
|
||||
BOOST_PYTHON_MODULE(xxx)
|
||||
{
|
||||
def("f", f
|
||||
, ( arg("x"), "y", arg("z")=0.0, arg("w")=1.0 )
|
||||
);
|
||||
}
|
||||
</pre>
|
||||
|
||||
<p>Revised 01 August, 2003</p>
|
||||
|
||||
<p><i>© Copyright <a href=
|
||||
"../../../../people/dave_abrahams.htm">Dave Abrahams</a> 2002-2003.</i></p>
|
||||
</body>
|
||||
</html>
|
||||
|
||||
@@ -10,10 +10,10 @@
|
||||
<tr>
|
||||
<td valign="top" width="300">
|
||||
<h3><a href="../../../../index.htm"><img height="86" width="277" alt=
|
||||
"C++ Boost" src="../../../../c++boost.gif" border="0"></a></h3>
|
||||
"C++ Boost" src="../../../../boost.png" border="0"></a></h3>
|
||||
</td>
|
||||
<td valign="top">
|
||||
<h1 align="center">Boost.Python</h1>
|
||||
<h1 align="center"><a href="../index.html">Boost.Python</a></h1>
|
||||
<h2 align="center">Bibliography</h2>
|
||||
</td>
|
||||
</tr>
|
||||
@@ -23,10 +23,10 @@
|
||||
<hr>
|
||||
<p>Revised
|
||||
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
|
||||
05 November, 2002
|
||||
13 November, 2002
|
||||
<!--webbot bot="Timestamp" endspan i-checksum="39359" -->
|
||||
</p>
|
||||
<p><i>© Copyright <a href="../../../../people/dave_abrahams.htm">Dave Abrahams</a>
|
||||
2002. All Rights Reserved.</i></p>
|
||||
2002. </i></p>
|
||||
</body>
|
||||
</html>
|
||||
|
||||
@@ -10,10 +10,10 @@
|
||||
<tr>
|
||||
<td valign="top" width="300">
|
||||
<h3><a href="../../../../index.htm"><img height="86" width="277" alt=
|
||||
"C++ Boost" src="../../../../c++boost.gif" border="0"></a></h3>
|
||||
"C++ Boost" src="../../../../boost.png" border="0"></a></h3>
|
||||
</td>
|
||||
<td valign="top">
|
||||
<h1 align="center">Boost.Python</h1>
|
||||
<h1 align="center"><a href="../index.html">Boost.Python</a></h1>
|
||||
<h2 align="center">Header <call.hpp></h2>
|
||||
</td>
|
||||
</tr>
|
||||
@@ -77,6 +77,6 @@ double apply2(PyObject* func, double x, double y)
|
||||
<!--webbot bot="Timestamp" endspan i-checksum="39359" -->
|
||||
</p>
|
||||
<p><i>© Copyright <a href="../../../../people/dave_abrahams.htm">Dave Abrahams</a>
|
||||
2002. All Rights Reserved.</i></p>
|
||||
2002. </i></p>
|
||||
</body>
|
||||
</html>
|
||||
|
||||
@@ -1,74 +1,89 @@
|
||||
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
|
||||
|
||||
<html>
|
||||
<head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<link rel="stylesheet" type="text/css" href="../boost.css">
|
||||
<title>Boost.Python - <call_method.hpp></title>
|
||||
</head>
|
||||
<body link="#0000ff" vlink="#800080">
|
||||
<table border="0" cellpadding="7" cellspacing="0" width="100%" summary=
|
||||
<head>
|
||||
<meta name="generator" content=
|
||||
"HTML Tidy for Windows (vers 1st August 2002), see www.w3.org">
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<link rel="stylesheet" type="text/css" href="../boost.css">
|
||||
|
||||
<title>Boost.Python - <call_method.hpp></title>
|
||||
</head>
|
||||
|
||||
<body link="#0000ff" vlink="#800080">
|
||||
<table border="0" cellpadding="7" cellspacing="0" width="100%" summary=
|
||||
"header">
|
||||
<tr>
|
||||
<td valign="top" width="300">
|
||||
<h3><a href="../../../../index.htm"><img height="86" width="277" alt=
|
||||
"C++ Boost" src="../../../../c++boost.gif" border="0"></a></h3>
|
||||
</td>
|
||||
<td valign="top">
|
||||
<h1 align="center">Boost.Python</h1>
|
||||
<h2 align="center">Header <call_method.hpp></h2>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
<hr>
|
||||
<h2>Contents</h2>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#introduction">Introduction</a></dt>
|
||||
<dt><a href="#functions">Functions</a></dt>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#call_method-spec">call_method</a></dt>
|
||||
</dl>
|
||||
<tr>
|
||||
<td valign="top" width="300">
|
||||
<h3><a href="../../../../index.htm"><img height="86" width="277"
|
||||
alt="C++ Boost" src="../../../../boost.png" border="0"></a></h3>
|
||||
</td>
|
||||
|
||||
<dt><a href="#examples">Example(s)</a></dt>
|
||||
<td valign="top">
|
||||
<h1 align="center"><a href="../index.html">Boost.Python</a></h1>
|
||||
|
||||
</dl>
|
||||
<hr>
|
||||
<h2><a name="introduction"></a>Introduction</h2>
|
||||
<p>
|
||||
<code><boost/python/call_method.hpp></code> defines the <a
|
||||
href="#call_method-spec"><code>call_method</code></a> family of overloaded function
|
||||
templates, used to invoke callable attributes of Python objects from C++.
|
||||
<h2 align="center">Header <call_method.hpp></h2>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
<hr>
|
||||
|
||||
<h2><a name="functions"></a>Functions</h2>
|
||||
<h2>Contents</h2>
|
||||
|
||||
<dl class="page-index">
|
||||
<dt><a href="#introduction">Introduction</a></dt>
|
||||
|
||||
<dt><a href="#functions">Functions</a></dt>
|
||||
|
||||
<dd>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#call_method-spec">call_method</a></dt>
|
||||
</dl>
|
||||
</dd>
|
||||
|
||||
<dt><a href="#examples">Example(s)</a></dt>
|
||||
</dl>
|
||||
<hr>
|
||||
|
||||
<h2><a name="introduction"></a>Introduction</h2>
|
||||
|
||||
<p><code><boost/python/call_method.hpp></code> defines the <a href=
|
||||
"#call_method-spec"><code>call_method</code></a> family of overloaded
|
||||
function templates, used to invoke callable attributes of Python objects
|
||||
from C++.</p>
|
||||
|
||||
<h2><a name="functions"></a>Functions</h2>
|
||||
<pre>
|
||||
<a name="call_method-spec">template <class R, class A1, class A2, ... class A<i>n</i>></a>
|
||||
<a name=
|
||||
"call_method-spec">template <class R, class A1, class A2, ... class A<i>n</i>></a>
|
||||
R call_method(PyObject* self, char const* method, A1 const&, A2 const&, ... A<i>n</i> const&)
|
||||
</pre>
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Requires:</b> <code>R</code> is a pointer type, reference
|
||||
type, or a complete type with an accessible copy constructor</dt>
|
||||
|
||||
<dt><b>Effects:</b> Invokes <code>self.<i>method</i>(a1, a2, ...a<i>n</i>)</code> in
|
||||
Python, where <code>a1</code>...<code>a<i>n</i></code> are the arguments to
|
||||
<code>call_method()</code>, converted to Python objects. For a
|
||||
complete semantic description, see <a href="callbacks.html">this
|
||||
page</a>.
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Requires:</b> <code>R</code> is a pointer type, reference type,
|
||||
or a complete type with an accessible copy constructor</dt>
|
||||
|
||||
<dt><b>Returns:</b> The result of the Python call, converted to the
|
||||
C++ type <code>R</code>.</dt>
|
||||
<dt><b>Effects:</b> Invokes
|
||||
<code>self.<i>method</i>(a1, a2, ...a<i>n</i>)</code> in
|
||||
Python, where <code>a1</code>...<code>a<i>n</i></code> are the
|
||||
arguments to <code>call_method()</code>, converted to Python objects.
|
||||
For a complete semantic description, see <a href="callbacks.html">this
|
||||
page</a>.</dt>
|
||||
|
||||
</dt>
|
||||
<dt><b>Rationale:</b> <code>call_method</code> is critical to
|
||||
implementing C++ virtual functions which are overridable in Python,
|
||||
as shown by the example below.
|
||||
</dt>
|
||||
</dl>
|
||||
<dt><b>Returns:</b> The result of the Python call, converted to the C++
|
||||
type <code>R</code>.</dt>
|
||||
|
||||
<h2><a name="examples"></a>Example(s)</h2>
|
||||
<dt><b>Rationale:</b> <code>call_method</code> is critical to
|
||||
implementing C++ virtual functions which are overridable in Python, as
|
||||
shown by the example below.</dt>
|
||||
</dl>
|
||||
|
||||
The following C++ illustrates the use of <code>call_method</code> in
|
||||
wrapping a class with a virtual function that can be overridden in
|
||||
Python:
|
||||
<h2><a name="examples"></a>Example(s)</h2>
|
||||
The following C++ illustrates the use of <code>call_method</code> in
|
||||
wrapping a class with a virtual function that can be overridden in
|
||||
Python:
|
||||
|
||||
<h3>C++ Module Definition</h3>
|
||||
<h3>C++ Module Definition</h3>
|
||||
<pre>
|
||||
#include <boost/python/module.hpp>
|
||||
#include <boost/python/class.hpp>
|
||||
@@ -79,13 +94,13 @@ Python:
|
||||
class Base
|
||||
{
|
||||
public:
|
||||
virtual char const* class_name() const { return "Base"; }
|
||||
virtual char const* class_name() const { return "Base"; }
|
||||
virtual ~Base();
|
||||
};
|
||||
|
||||
bool is_base(Base* b)
|
||||
{
|
||||
return !std::strcmp(b->class_name(), "Base");
|
||||
return !std::strcmp(b->class_name(), "Base");
|
||||
}
|
||||
|
||||
// Wrapper code begins here
|
||||
@@ -97,26 +112,25 @@ class Base_callback : public Base
|
||||
public:
|
||||
Base_callback(PyObject* self) : m_self(self) {}
|
||||
|
||||
char const* class_name() const { return <b>call_method</b>(m_self, "class_name"); }
|
||||
char const* class_name() const { return <b>call_method</b><char const*>(m_self, "class_name"); }
|
||||
char const* Base_name() const { return Base::class_name(); }
|
||||
private:
|
||||
PyObject* m_self;
|
||||
PyObject* const m_self;
|
||||
};
|
||||
|
||||
using namespace boost::python;
|
||||
BOOST_PYTHON_MODULE_INIT(my_module)
|
||||
BOOST_PYTHON_MODULE(my_module)
|
||||
{
|
||||
module("my_module")
|
||||
.def("is_base", is_base)
|
||||
.add(
|
||||
class_<Base,Base_callback, noncopyable>("Base")
|
||||
.def("class_name", Base_callback::Base_name);
|
||||
)
|
||||
;
|
||||
def("is_base", is_base);
|
||||
|
||||
class_<Base,Base_callback, noncopyable>("Base")
|
||||
.def("class_name", &Base_callback::Base_name)
|
||||
;
|
||||
|
||||
}
|
||||
</pre>
|
||||
|
||||
<h3>Python Code</h3>
|
||||
<h3>Python Code</h3>
|
||||
<pre>
|
||||
>>> from my_module import *
|
||||
>>> class Derived(Base):
|
||||
@@ -130,12 +144,15 @@ BOOST_PYTHON_MODULE_INIT(my_module)
|
||||
>>> is_base(Derived())
|
||||
0
|
||||
</pre>
|
||||
<p>Revised
|
||||
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
|
||||
10 May, 2002
|
||||
|
||||
<p>Revised
|
||||
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
|
||||
13 November, 2002
|
||||
<!--webbot bot="Timestamp" endspan i-checksum="39359" -->
|
||||
</p>
|
||||
<p><i>© Copyright <a href="../../../../people/dave_abrahams.htm">Dave Abrahams</a>
|
||||
2002. All Rights Reserved.</i></p>
|
||||
</body>
|
||||
</p>
|
||||
|
||||
<p><i>© Copyright <a href=
|
||||
"../../../../people/dave_abrahams.htm">Dave Abrahams</a> 2002.</i></p>
|
||||
</body>
|
||||
</html>
|
||||
|
||||
|
||||
@@ -1,62 +1,85 @@
|
||||
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
|
||||
|
||||
<html>
|
||||
<head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<link rel="stylesheet" type="text/css" href="../boost.css">
|
||||
<title>Boost.Python - Calling Python Functions and Methods</title>
|
||||
</head>
|
||||
<body link="#0000ff" vlink="#800080">
|
||||
<table border="0" cellpadding="7" cellspacing="0" width="100%" summary=
|
||||
<head>
|
||||
<meta name="generator" content=
|
||||
"HTML Tidy for Windows (vers 1st August 2002), see www.w3.org">
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<link rel="stylesheet" type="text/css" href="../boost.css">
|
||||
|
||||
<title>Boost.Python - Calling Python Functions and Methods</title>
|
||||
</head>
|
||||
|
||||
<body link="#0000ff" vlink="#800080">
|
||||
<table border="0" cellpadding="7" cellspacing="0" width="100%" summary=
|
||||
"header">
|
||||
<tr>
|
||||
<td valign="top" width="300">
|
||||
<h3><a href="../../../../index.htm"><img height="86" width="277" alt=
|
||||
"C++ Boost" src="../../../../c++boost.gif" border="0"></a></h3>
|
||||
</td>
|
||||
<td valign="top">
|
||||
<h1 align="center">Boost.Python</h1>
|
||||
<h2 align="center">Calling Python Functions and Methods</h2>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
<hr>
|
||||
<h2>Contents</h2>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#introduction">Introduction</a></dt>
|
||||
<dt><a href="#argument_handling">Argument Handling</a></dt>
|
||||
<dt><a href="#result_handling">Result Handling</a></dt>
|
||||
<dt><a href="#result_handling">Rationale</a></dt>
|
||||
</dl>
|
||||
<hr>
|
||||
<tr>
|
||||
<td valign="top" width="300">
|
||||
<h3><a href="../../../../index.htm"><img height="86" width="277"
|
||||
alt="C++ Boost" src="../../../../boost.png" border="0"></a></h3>
|
||||
</td>
|
||||
|
||||
<h2><a name="introduction">Introduction</a></h2>
|
||||
<p>
|
||||
Boost.Python provides two families of function templates,
|
||||
<code><a href="call.html#call-spec">call</a></code> and <code><a
|
||||
href="call_method.html#call_method-spec">call_method</a></code>, for
|
||||
invoking Python functions and methods respectively. The interface for
|
||||
calling a Python function object (or any Python callable object) looks
|
||||
like:
|
||||
<td valign="top">
|
||||
<h1 align="center"><a href="../index.html">Boost.Python</a></h1>
|
||||
|
||||
<h2 align="center">Calling Python Functions and Methods</h2>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
<hr>
|
||||
|
||||
<h2>Contents</h2>
|
||||
|
||||
<dl class="page-index">
|
||||
<dt><a href="#introduction">Introduction</a></dt>
|
||||
|
||||
<dt><a href="#argument_handling">Argument Handling</a></dt>
|
||||
|
||||
<dt><a href="#result_handling">Result Handling</a></dt>
|
||||
|
||||
<dt><a href="#result_handling">Rationale</a></dt>
|
||||
</dl>
|
||||
<hr>
|
||||
|
||||
<h2><a name="introduction">Introduction</a></h2>
|
||||
The simplest way to call a Python function from C++, given an <code><a
|
||||
href="object.html#object-spec">object</a></code> instance <code>f</code>
|
||||
holding the function, is simply to invoke its function call operator.
|
||||
<pre>
|
||||
f("tea", 4, 2) // In Python: f('tea', 4, 2)
|
||||
</pre>
|
||||
And of course, a method of an <code><a href=
|
||||
"object.html#object-spec">object</a></code> instance <code>x</code> can
|
||||
be invoked by using the function-call operator of the corresponding
|
||||
attribute:
|
||||
<pre>
|
||||
x.attr("tea")(4, 2); // In Python: x.tea(4, 2)
|
||||
</pre>
|
||||
|
||||
<p>If you don't have an <code>object</code> instance, Boost.Python
|
||||
provides two families of function templates, <code><a href=
|
||||
"call.html#call-spec">call</a></code> and <code><a href=
|
||||
"call_method.html#call_method-spec">call_method</a></code>, for invoking
|
||||
Python functions and methods respectively on <code>PyObject*</code>s. The
|
||||
interface for calling a Python function object (or any Python callable
|
||||
object) looks like:</p>
|
||||
<pre>
|
||||
call<ResultType>(callable_object, a1, a2... a<i>N</i>);
|
||||
</pre>
|
||||
|
||||
Calling a method of a Python object is similarly easy:
|
||||
|
||||
Calling a method of a Python object is similarly easy:
|
||||
<pre>
|
||||
call_method<ResultType>(self_object, "<i>method-name</i>", a1, a2... a<i>N</i>);
|
||||
call_method<ResultType>(self_object, "<i>method-name</i>", a1, a2... a<i>N</i>);
|
||||
</pre>
|
||||
This comparitively low-level interface is the one you'll use when
|
||||
implementing C++ virtual functions that can be overridden in Python.
|
||||
|
||||
<h2><a name="argument_handling">Argument Handling</a></h2>
|
||||
|
||||
<h2><a name="argument_handling">Argument Handling</a></h2>
|
||||
<p>
|
||||
|
||||
Arguments are converted to Python according to their type. By default,
|
||||
the arguments <code>a1</code>...<code>a<i>N</i></code> are copied into
|
||||
new Python objects, but this behavior can be overridden by the use of
|
||||
<code><a href="ptr.html#ptr-spec">ptr()</a></code> and <a
|
||||
href="../../../bind/ref.html#reference_wrapper">ref()</a>:
|
||||
|
||||
<p>Arguments are converted to Python according to their type. By default,
|
||||
the arguments <code>a1</code>...<code>a<i>N</i></code> are copied into
|
||||
new Python objects, but this behavior can be overridden by the use of
|
||||
<code><a href="ptr.html#ptr-spec">ptr()</a></code> and <a href=
|
||||
"../../../bind/ref.html#reference_wrapper">ref()</a>:</p>
|
||||
<pre>
|
||||
class X : boost::noncopyable
|
||||
{
|
||||
@@ -69,178 +92,160 @@ void apply(PyObject* callable, X& x)
|
||||
boost::python::call<void>(callable, boost::ref(x));
|
||||
}
|
||||
</pre>
|
||||
|
||||
In the table below, <code><b>x</b></code> denotes the actual argument
|
||||
object and <code><b>cv</b></code> denotes an optional
|
||||
<i>cv-qualification</i>: "<code>const</code>",
|
||||
"<code>volatile</code>", or "<code>const
|
||||
volatile</code>".
|
||||
In the table below, <code><b>x</b></code> denotes the actual argument
|
||||
object and <code><b>cv</b></code> denotes an optional
|
||||
<i>cv-qualification</i>: "<code>const</code>", "<code>volatile</code>",
|
||||
or "<code>const volatile</code>".
|
||||
|
||||
<table border="1" summary="class_ template parameters">
|
||||
<tr>
|
||||
<th>Argument Type
|
||||
<th>Argument Type</th>
|
||||
|
||||
<th>Behavior
|
||||
<th>Behavior</th>
|
||||
</tr>
|
||||
|
||||
<tr>
|
||||
<td><code>T cv&</code><br>
|
||||
<code>T cv</code>
|
||||
<code>T cv</code></td>
|
||||
|
||||
<td>The Python argument is created by the same means used
|
||||
for the return value of a wrapped C++ function returning
|
||||
<code>T</code>. When
|
||||
<code>T</code> is a class type, that normally means
|
||||
<code>*x</code> is copy-constructed into the new Python
|
||||
object.
|
||||
<td>The Python argument is created by the same means used for the
|
||||
return value of a wrapped C++ function returning <code>T</code>. When
|
||||
<code>T</code> is a class type, that normally means <code>*x</code>
|
||||
is copy-constructed into the new Python object.</td>
|
||||
</tr>
|
||||
|
||||
<tr>
|
||||
<td><code>T*</code>
|
||||
<td><code>T*</code></td>
|
||||
|
||||
<td>If <code>x == 0</code>, the Python argument will
|
||||
be <code><a
|
||||
href="http://www.python.org/doc/current/lib/bltin-null-object.html">None</a></code>. Otherwise,
|
||||
the Python argument is created by the same means used for the
|
||||
return value of a wrapped C++ function returning
|
||||
<code>T</code>. When
|
||||
<code>T</code> is a class type, that normally means
|
||||
<code>*x</code> is copy-constructed into the new Python
|
||||
object.
|
||||
<td>If <code>x == 0</code>, the Python argument will be
|
||||
<code><a href=
|
||||
"http://www.python.org/doc/current/lib/bltin-null-object.html">None</a></code>.
|
||||
Otherwise, the Python argument is created by the same means used for
|
||||
the return value of a wrapped C++ function returning <code>T</code>.
|
||||
When <code>T</code> is a class type, that normally means
|
||||
<code>*x</code> is copy-constructed into the new Python object.</td>
|
||||
</tr>
|
||||
|
||||
<tr>
|
||||
<td><code><a
|
||||
href="../../../bind/ref.html#reference_wrapper">boost::reference_wrapper</a><T> </code>
|
||||
<td><code><a href=
|
||||
"../../../bind/ref.html#reference_wrapper">boost::reference_wrapper</a><T></code></td>
|
||||
|
||||
<td>The Python argument contains a pointer to, rather than a
|
||||
copy of, <code>x.get()</code>. Note: failure to ensure that no
|
||||
Python code holds a reference to the resulting object beyond
|
||||
the lifetime of <code>*x.get()</code> <b>may result in a
|
||||
crash!</b>
|
||||
<td>The Python argument contains a pointer to, rather than a copy of,
|
||||
<code>x.get()</code>. Note: failure to ensure that no Python code
|
||||
holds a reference to the resulting object beyond the lifetime of
|
||||
<code>*x.get()</code> <b>may result in a crash!</b></td>
|
||||
</tr>
|
||||
|
||||
<tr>
|
||||
<td><code><a
|
||||
href="ptr.html#pointer_wrapper-spec">pointer_wrapper</a><T></code>
|
||||
|
||||
<td>If <code>x.get() == 0</code>, the Python
|
||||
argument will be <code><a
|
||||
href="http://www.python.org/doc/current/lib/bltin-null-object.html">None</a></code>.
|
||||
Otherwise, the Python argument contains a pointer to, rather
|
||||
than a copy of, <code>*x.get()</code>. Note: failure to ensure
|
||||
that no Python code holds a reference to the resulting object
|
||||
beyond the lifetime of <code>*x.get()</code> <b>may result in
|
||||
a crash!</b>
|
||||
<td><code><a href=
|
||||
"ptr.html#pointer_wrapper-spec">pointer_wrapper</a><T></code></td>
|
||||
|
||||
<td>If <code>x.get() == 0</code>, the Python argument will
|
||||
be <code><a href=
|
||||
"http://www.python.org/doc/current/lib/bltin-null-object.html">None</a></code>.
|
||||
Otherwise, the Python argument contains a pointer to, rather than a
|
||||
copy of, <code>*x.get()</code>. Note: failure to ensure that no
|
||||
Python code holds a reference to the resulting object beyond the
|
||||
lifetime of <code>*x.get()</code> <b>may result in a crash!</b></td>
|
||||
</tr>
|
||||
</table>
|
||||
|
||||
<h2><a name="result_handling">Result Handling</a></h2>
|
||||
<h2><a name="result_handling">Result Handling</a></h2>
|
||||
In general, <code>call<ResultType>()</code> and
|
||||
<code>call_method<ResultType>()</code> return
|
||||
<code>ResultType</code> by exploiting all lvalue and rvalue
|
||||
<code>from_python</code> converters registered for ResultType and
|
||||
returning a copy of the result. However, when <code>ResultType</code> is
|
||||
a pointer or reference type, Boost.Python searches only for lvalue
|
||||
converters. To prevent dangling pointers and references, an exception
|
||||
will be thrown if the Python result object has only a single reference
|
||||
count.
|
||||
|
||||
In general, <code>call<ResultType>()</code> and
|
||||
<code>call_method<ResultType>()</code> return
|
||||
<code>ResultType</code> by exploiting all lvalue and rvalue
|
||||
<code>from_python</code> converters registered for ResultType and
|
||||
returning a copy of the result. However, when
|
||||
<code>ResultType</code> is a pointer or reference type, Boost.Python
|
||||
searches only for lvalue converters. To prevent dangling pointers and
|
||||
references, an exception will be thrown if the Python result object
|
||||
has only a single reference count.
|
||||
<h2><a name="rationale">Rationale</a></h2>
|
||||
In general, to get Python arguments corresponding to
|
||||
<code>a1</code>...<code>a<i>N</i></code>, a new Python object must be
|
||||
created for each one; should the C++ object be copied into that Python
|
||||
object, or should the Python object simply hold a reference/pointer to
|
||||
the C++ object? In general, the latter approach is unsafe, since the
|
||||
called function may store a reference to the Python object somewhere. If
|
||||
the Python object is used after the C++ object is destroyed, we'll crash
|
||||
Python.
|
||||
|
||||
<h2><a name="rationale">Rationale</a></h2>
|
||||
<p>In keeping with the philosophy that users on the Python side shouldn't
|
||||
have to worry about crashing the interpreter, the default behavior is to
|
||||
copy the C++ object, and to allow a non-copying behavior only if the user
|
||||
writes <code><a href="../../../bind/ref.html">boost::ref</a>(a1)</code>
|
||||
instead of a1 directly. At least this way, the user doesn't get dangerous
|
||||
behavior "by accident". It's also worth noting that the non-copying
|
||||
("by-reference") behavior is in general only available for class types,
|
||||
and will fail at runtime with a Python exception if used otherwise[<a
|
||||
href="#1">1</a>].</p>
|
||||
|
||||
In general, to get Python arguments corresponding to
|
||||
<code>a1</code>...<code>a<i>N</i></code>, a new Python object must be
|
||||
created for each one; should the C++ object be copied into that Python
|
||||
object, or should the Python object simply hold a reference/pointer to
|
||||
the C++ object? In general, the latter approach is unsafe, since the
|
||||
called function may store a reference to the Python object
|
||||
somewhere. If the Python object is used after the C++ object is
|
||||
destroyed, we'll crash Python.
|
||||
<p>However, pointer types present a problem: one approach is to refuse to
|
||||
compile if any aN has pointer type: after all, a user can always pass
|
||||
<code>*aN</code> to pass "by-value" or <code>ref(*aN)</code> to indicate
|
||||
a pass-by-reference behavior. However, this creates a problem for the
|
||||
expected null pointer to <code>None</code> conversion: it's illegal to
|
||||
dereference a null pointer value.</p>
|
||||
|
||||
<p>In keeping with the philosophy that users on the Python side
|
||||
shouldn't have to worry about crashing the interpreter, the default
|
||||
behavior is to copy the C++ object, and to allow a non-copying
|
||||
behavior only if the user writes <code><a
|
||||
href="../../../bind/ref.html">boost::ref</a>(a1)</code> instead of a1
|
||||
directly. At least this way, the user doesn't get dangerous behavior
|
||||
"by accident". It's also worth noting that the non-copying
|
||||
("by-reference") behavior is in general only available for
|
||||
class types, and will fail at runtime with a Python exception if used
|
||||
otherwise[<a href="#1">1</a>].
|
||||
<p>The compromise I've settled on is this:</p>
|
||||
|
||||
<p>
|
||||
However, pointer types present a problem: one approach is to refuse
|
||||
to compile if any aN has pointer type: after all, a user can always pass
|
||||
<code>*aN</code> to pass "by-value" or <code>ref(*aN)</code>
|
||||
to indicate a pass-by-reference behavior. However, this creates a
|
||||
problem for the expected null pointer to
|
||||
<code>None</code> conversion: it's illegal to dereference a null
|
||||
pointer value.
|
||||
<ol>
|
||||
<li>The default behavior is pass-by-value. If you pass a non-null
|
||||
pointer, the pointee is copied into a new Python object; otherwise the
|
||||
corresponding Python argument will be None.</li>
|
||||
|
||||
<p>
|
||||
<li>if you want by-reference behavior, use <code>ptr(aN)</code> if
|
||||
<code>aN</code> is a pointer and <code>ref(aN)</code> otherwise. If a
|
||||
null pointer is passed to <code>ptr(aN)</code>, the corresponding
|
||||
Python argument will be <code>None</code>.</li>
|
||||
</ol>
|
||||
|
||||
The compromise I've settled on is this:
|
||||
<p>As for results, we have a similar problem: if <code>ResultType</code>
|
||||
is allowed to be a pointer or reference type, the lifetime of the object
|
||||
it refers to is probably being managed by a Python object. When that
|
||||
Python object is destroyed, our pointer dangles. The problem is
|
||||
particularly bad when the <code>ResultType</code> is char const* - the
|
||||
corresponding Python String object is typically uniquely-referenced,
|
||||
meaning that the pointer dangles as soon as <code>call<char
|
||||
const*>(...)</code> returns.</p>
|
||||
|
||||
<ol>
|
||||
<li>The default behavior is pass-by-value. If you pass a non-null
|
||||
pointer, the pointee is copied into a new Python object; otherwise
|
||||
the corresponding Python argument will be None.
|
||||
<p>The old Boost.Python v1 deals with this issue by refusing to compile
|
||||
any uses of <code>call<char const*>()</code>, but this goes both
|
||||
too far and not far enough. It goes too far because there are cases where
|
||||
the owning Python string object survives beyond the call (just for
|
||||
instance, when it's the name of a Python class), and it goes not far
|
||||
enough because we might just as well have the same problem with a
|
||||
returned pointer or reference of any other type.</p>
|
||||
|
||||
<li>if you want by-reference behavior, use <code>ptr(aN)</code> if
|
||||
<code>aN</code> is a pointer and <code>ref(aN)</code> otherwise. If
|
||||
a null pointer is passed to <code>ptr(aN)</code>, the corresponding
|
||||
Python argument will be <code>None</code>.
|
||||
</ol>
|
||||
<p>In Boost.Python v2 this is dealt with by:</p>
|
||||
|
||||
<p>
|
||||
As for results, we have a similar problem: if <code>ResultType</code>
|
||||
is allowed to be a pointer or reference type, the lifetime of the
|
||||
object it refers to is probably being managed by a Python object. When
|
||||
that Python object is destroyed, our pointer dangles. The problem is
|
||||
particularly bad when the <code>ResultType</code> is char const* - the
|
||||
corresponding Python String object is typically uniquely-referenced,
|
||||
meaning that the pointer dangles as soon as <code>call<char
|
||||
const*>(...)</code> returns.
|
||||
<ol>
|
||||
<li>lifting the compile-time restriction on const char* callback
|
||||
returns</li>
|
||||
|
||||
<p>
|
||||
The old Boost.Python v1 deals with this issue by refusing to compile
|
||||
any uses of <code>call<char const*>()</code>, but this goes both
|
||||
too far and not far enough. It goes too far because there are cases
|
||||
where the owning Python string object survives beyond the call (just
|
||||
for instance, when it's the name of a Python class), and it goes not
|
||||
far enough because we might just as well have the same problem with a
|
||||
returned pointer or reference of any other type.
|
||||
<li>detecting the case when the reference count on the result Python
|
||||
object is 1 and throwing an exception inside of
|
||||
<code>call<U>(...)</code> when <code>U</code> is a pointer or
|
||||
reference type.</li>
|
||||
</ol>
|
||||
This should be acceptably safe because users have to explicitly specify a
|
||||
pointer/reference for <code>U</code> in <code>call<U></code>, and
|
||||
they will be protected against dangles at runtime, at least long enough
|
||||
to get out of the <code>call<U>(...)</code> invocation.
|
||||
<hr>
|
||||
<a name="1">[1]</a> It would be possible to make it fail at compile-time
|
||||
for non-class types such as int and char, but I'm not sure it's a good
|
||||
idea to impose this restriction yet.
|
||||
|
||||
<p>
|
||||
|
||||
In Boost.Python v2 this is dealt with by:
|
||||
|
||||
<ol>
|
||||
<li> lifting the compile-time restriction on const
|
||||
char* callback returns
|
||||
|
||||
|
||||
<li> detecting the case when the reference count on the result
|
||||
Python object is 1 and throwing an exception inside of
|
||||
<code>call<U>(...)</code> when <code>U</code> is a pointer
|
||||
or reference type.
|
||||
</ol>
|
||||
|
||||
This should be acceptably safe because users have to explicitly
|
||||
specify a pointer/reference for <code>U</code> in
|
||||
<code>call<U></code>, and they will be protected against dangles
|
||||
at runtime, at least long enough to get out of the
|
||||
<code>call<U>(...)</code> invocation.
|
||||
|
||||
<hr>
|
||||
|
||||
<a name="1">[1]</a> It would be possible to make it fail at compile-time for non-class
|
||||
types such as int and char, but I'm not sure it's a good idea to impose
|
||||
this restriction yet.
|
||||
|
||||
<p>Revised
|
||||
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
|
||||
17 April, 2002
|
||||
<p>Revised
|
||||
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
|
||||
13 November, 2002
|
||||
<!--webbot bot="Timestamp" endspan i-checksum="39359" -->
|
||||
</p>
|
||||
<p><i>© Copyright <a href="../../../../people/dave_abrahams.htm">Dave Abrahams</a>
|
||||
2002. All Rights Reserved.</i></p>
|
||||
</body>
|
||||
</p>
|
||||
|
||||
<p><i>© Copyright <a href=
|
||||
"../../../../people/dave_abrahams.htm">Dave Abrahams</a> 2002.</i></p>
|
||||
</body>
|
||||
</html>
|
||||
|
||||
|
||||
@@ -1,91 +1,152 @@
|
||||
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
|
||||
|
||||
<html>
|
||||
<head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<link rel="stylesheet" type="text/css" href="../boost.css">
|
||||
<title>Boost.Python - Configuration</title>
|
||||
</head>
|
||||
<body link="#0000ff" vlink="#800080">
|
||||
<table border="0" cellpadding="7" cellspacing="0" width="100%" summary=
|
||||
<head>
|
||||
<meta name="generator" content=
|
||||
"HTML Tidy for Windows (vers 1st August 2002), see www.w3.org">
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<link rel="stylesheet" type="text/css" href="../boost.css">
|
||||
|
||||
<title>Boost.Python - Configuration</title>
|
||||
</head>
|
||||
|
||||
<body link="#0000ff" vlink="#800080">
|
||||
<table border="0" cellpadding="7" cellspacing="0" width="100%" summary=
|
||||
"header">
|
||||
<tr>
|
||||
<td valign="top" width="300">
|
||||
<h3><a href="../../../../index.htm"><img height="86" width="277" alt=
|
||||
"C++ Boost" src="../../../../c++boost.gif" border="0"></a></h3>
|
||||
</td>
|
||||
<td valign="top">
|
||||
<h1 align="center">Boost.Python</h1>
|
||||
<h2 align="center">Configuration</h2>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
<hr>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#introduction">Introduction</a></dt>
|
||||
<dt><a href="#app-defined">Application Defined Macros</a></dt>
|
||||
<dt><a href="#lib-defined-public">Public Library Defined Macros</a></dt>
|
||||
<dt><a href="#lib-defined-impl">Library Defined Implementation Macros</a></dt>
|
||||
</dl>
|
||||
<h2><a name="introduction"></a>Introduction</h2>
|
||||
<p>Boost.Python uses several configuration macros in <a href="http://www.boost.org/libs/config/config.htm"><boost/config.hpp></a>,
|
||||
as well as configuration macros meant to be supplied by the application. These
|
||||
macros are documented here.</p>
|
||||
<h2><a name="app-defined"></a>Application Defined Macros</h2>
|
||||
<p>These are the macros that may be defined by an application using Boost.Python.</p>
|
||||
<table summary="application defined macros" cellspacing="10" width="100%">
|
||||
<tr>
|
||||
<td><b>Macro</b></td>
|
||||
<td><b>Meaning</b></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>{{macro}}</td>
|
||||
<td>{{meaning}}</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>{{macro}}</td>
|
||||
<td>{{meaning}}</td>
|
||||
</tr>
|
||||
</table>
|
||||
<h2><a name="lib-defined-public"></a>Public Library Defined Macros</h2>
|
||||
<p>These macros are defined by Boost.Python but are expected to be used by application
|
||||
code.</p>
|
||||
<table summary="public library defined macros" cellspacing="10" width="100%">
|
||||
<tr>
|
||||
<td><b>Macro</b></td>
|
||||
<td><b>Meaning</b></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>{{macro}}</td>
|
||||
<td>{{meaning}}</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>{{macro}}</td>
|
||||
<td>{{meaning}}</td>
|
||||
</tr>
|
||||
</table>
|
||||
<h2><a name="lib-defined-impl"></a>Library Defined Implementation Macros</h2>
|
||||
<p>These macros are defined by Boost.Python and are implementation details of interest
|
||||
only to implementers.</p>
|
||||
<table summary="library defined implementation macros" cellspacing="10" width="100%">
|
||||
<tr>
|
||||
<td><b>Macro</b></td>
|
||||
<td><b>Meaning</b></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>{{macro}}</td>
|
||||
<td>{{meaning}}</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>{{macro}}</td>
|
||||
<td>{{meaning}}</td>
|
||||
</tr>
|
||||
</table>
|
||||
<hr>
|
||||
<p>Revised
|
||||
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
|
||||
05 November, 2002
|
||||
<!--webbot bot="Timestamp" endspan i-checksum="39359" -->
|
||||
</p>
|
||||
<p><i>© Copyright <a href="../../../../people/dave_abrahams.htm">Dave Abrahams</a>
|
||||
2002. All Rights Reserved.</i></p>
|
||||
</body>
|
||||
<tr>
|
||||
<td valign="top" width="300">
|
||||
<h3><a href="../../../../index.htm"><img height="86" width="277"
|
||||
alt="C++ Boost" src="../../../../boost.png" border="0"></a></h3>
|
||||
</td>
|
||||
|
||||
<td valign="top">
|
||||
<h1 align="center"><a href="../index.html">Boost.Python</a></h1>
|
||||
|
||||
<h2 align="center">Configuration</h2>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
<hr>
|
||||
|
||||
<dl class="page-index">
|
||||
<dt><a href="#introduction">Introduction</a></dt>
|
||||
|
||||
<dt><a href="#app-defined">Application Defined Macros</a></dt>
|
||||
|
||||
<dt><a href="#lib-defined-impl">Library Defined Implementation
|
||||
Macros</a></dt>
|
||||
</dl>
|
||||
|
||||
<h2><a name="introduction"></a>Introduction</h2>
|
||||
|
||||
<p><b>Boost.Python</b> uses several configuration macros in <a href=
|
||||
"http://www.boost.org/libs/config/config.htm"><boost/config.hpp></a>,
|
||||
as well as configuration macros meant to be supplied by the application.
|
||||
These macros are documented here.</p>
|
||||
|
||||
<h2><a name="app-defined"></a>Application Defined Macros</h2>
|
||||
|
||||
<p>These are the macros that may be defined by an application using
|
||||
<b>Boost.Python</b>. Note that if you extend a strict interpretation of
|
||||
the C++ standard to cover dynamic libraries, using different values of
|
||||
these macros when compiling different libraries (including extension
|
||||
modules and the <b>Boost.Python</b> library itself) is a violation of the
|
||||
<a href="definitions.html#ODR">ODR</a>. However, we know of no C++
|
||||
implementations on which this particular violation is detectable or
|
||||
causes any problems.</p>
|
||||
|
||||
<table summary="application defined macros" width="100%" cellpadding=
|
||||
"10">
|
||||
<tr>
|
||||
<th align="left"><b>Macro</b></th>
|
||||
|
||||
<th><b>Default</b></th>
|
||||
|
||||
<th align="left"><b>Meaning</b></th>
|
||||
</tr>
|
||||
|
||||
<tr>
|
||||
<td valign="top"><code>BOOST_PYTHON_MAX_ARITY</code></td>
|
||||
|
||||
<td valign="top" align="center">15</td>
|
||||
|
||||
<td valign="top">The maximum <a href=
|
||||
"definitions.html#arity">arity</a> of any function, member function,
|
||||
or constructor to be wrapped, invocation of a <b>Boost.Python</b>
|
||||
function wich is specified as taking arguments
|
||||
<code>x1, x2,</code>...<code>X</code><i>n</i>. This includes, in
|
||||
particular, callback mechanisms such as <code><a href=
|
||||
"object.html#object-spec">object</a>::operator()(</code>...<code>)</code>
|
||||
or <code><a href=
|
||||
"call_method.html#call_method-spec">call_method</a><R>(</code>...
|
||||
<code>)</code>.</td>
|
||||
</tr>
|
||||
|
||||
<tr>
|
||||
<td valign="top"><code>BOOST_PYTHON_MAX_BASES</code></td>
|
||||
|
||||
<td valign="top" align="center">10</td>
|
||||
|
||||
<td valign="top">The maximum number of template arguments to the
|
||||
<code><a href=
|
||||
"class.html#bases-spec">bases</a><</code>...<code>></code>
|
||||
class template, which is used to specify the bases of a wrapped C++
|
||||
class..</td>
|
||||
</tr>
|
||||
|
||||
<tr>
|
||||
<td valign="top"><code>BOOST_PYTHON_STATIC_MODULE</code></td>
|
||||
|
||||
<td valign="top" align="center"><i>not defined</i></td>
|
||||
|
||||
<td valign="top">If defined, prevents your module initialization
|
||||
function from being treated as an exported symbol on platforms which
|
||||
support that distinction in-code</td>
|
||||
</tr>
|
||||
</table>
|
||||
|
||||
<h2><a name="lib-defined-impl"></a>Library Defined Implementation
|
||||
Macros</h2>
|
||||
|
||||
<p>These macros are defined by <b>Boost.Python</b> and are implementation
|
||||
details of interest only to implementors and those porting to new
|
||||
platforms.</p>
|
||||
|
||||
<table summary="library defined implementation macros" width="100%"
|
||||
cellpadding="10">
|
||||
<tr>
|
||||
<th align="left"><b>Macro</b></th>
|
||||
|
||||
<th><b>Default</b></th>
|
||||
|
||||
<th align="left"><b>Meaning</b></th>
|
||||
</tr>
|
||||
|
||||
<tr>
|
||||
<td valign="top"><code>BOOST_PYTHON_TYPE_ID_NAME</code></td>
|
||||
|
||||
<td valign="top" align="center"><i>not defined</i></td>
|
||||
|
||||
<td valign="top">If defined, this indicates that the type_info
|
||||
comparison across shared library boundaries does not work on this
|
||||
platform. In other words, if shared-lib-1 passes
|
||||
<code>typeid(T)</code> to a function in shared-lib-2 which compares
|
||||
it to <code>typeid(T)</code>, that comparison may return
|
||||
<code>false</code>. If this macro is #defined, Boost.Python uses and
|
||||
compares <code>typeid(T).name()</code> instead of using and comparing
|
||||
the <code>std::type_info</code> objects directly.</td>
|
||||
</tr>
|
||||
</table>
|
||||
<hr>
|
||||
|
||||
<p>Revised
|
||||
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
|
||||
7 January, 2003
|
||||
<!--webbot bot="Timestamp" endspan i-checksum="39359" -->
|
||||
</p>
|
||||
|
||||
<p><i>© Copyright <a href=
|
||||
"../../../../people/dave_abrahams.htm">Dave Abrahams</a> 2002.</i></p>
|
||||
</body>
|
||||
</html>
|
||||
|
||||
|
||||
@@ -1,46 +1,58 @@
|
||||
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
|
||||
<meta name="generator" content="HTML Tidy, see www.w3.org">
|
||||
|
||||
<html>
|
||||
<head>
|
||||
<meta name="generator" content=
|
||||
"HTML Tidy for Windows (vers 1st August 2002), see www.w3.org">
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<link rel="stylesheet" type="text/css" href="../boost.css">
|
||||
|
||||
<title>Boost.Python - <boost/python/copy_const_reference.hpp></title>
|
||||
<title>Boost.Python -
|
||||
<boost/python/copy_const_reference.hpp></title>
|
||||
</head>
|
||||
|
||||
<body>
|
||||
<table border="0" cellpadding="7" cellspacing="0" width="100%" summary=
|
||||
"header">
|
||||
<tr>
|
||||
<td valign="top" width="300">
|
||||
<h3><a href="../../../../index.htm"><img height="86" width="277" alt=
|
||||
"C++ Boost" src="../../../../c++boost.gif" border="0"></a></h3>
|
||||
<h3><a href="../../../../index.htm"><img height="86" width="277"
|
||||
alt="C++ Boost" src="../../../../boost.png" border="0"></a></h3>
|
||||
</td>
|
||||
|
||||
<td valign="top">
|
||||
<h1 align="center">Boost.Python</h1>
|
||||
<h1 align="center"><a href="../index.html">Boost.Python</a></h1>
|
||||
|
||||
<h2 align="center">Header
|
||||
<boost/python/copy_const_reference.hpp></h2>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
<hr>
|
||||
|
||||
<h2>Contents</h2>
|
||||
|
||||
<dl class="page-index">
|
||||
<dt><a href="#classes">Classes</a>
|
||||
<dt><a href="#classes">Classes</a></dt>
|
||||
|
||||
<dd>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#copy_const_reference-spec">Class
|
||||
<code>copy_const_reference</code></a>
|
||||
<code>copy_const_reference</code></a></dt>
|
||||
|
||||
<dd>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#copy_const_reference-spec-synopsis">Class
|
||||
<code>copy_const_reference</code> synopsis</a>
|
||||
<code>copy_const_reference</code> synopsis</a></dt>
|
||||
|
||||
<dt><a href="#copy_const_reference-spec-metafunctions">Class
|
||||
<code>copy_const_reference</code> metafunctions</a>
|
||||
<code>copy_const_reference</code> metafunctions</a></dt>
|
||||
</dl>
|
||||
</dd>
|
||||
</dl>
|
||||
</dd>
|
||||
|
||||
<dt><a href="#examples">Example</a>
|
||||
<dt><a href="#examples">Example</a></dt>
|
||||
</dl>
|
||||
<hr>
|
||||
|
||||
@@ -50,9 +62,10 @@
|
||||
<code>copy_const_reference</code></h3>
|
||||
|
||||
<p><code>copy_const_reference</code> is a model of <a href=
|
||||
"ResultConverter.html#ResultConverterGenerator-concept">ResultConverterGenerator</a> which can be
|
||||
used to wrap C++ functions returning a reference-to-const type such that
|
||||
the referenced value is copied into a new Python object.
|
||||
"ResultConverter.html#ResultConverterGenerator-concept">ResultConverterGenerator</a>
|
||||
which can be used to wrap C++ functions returning a reference-to-const
|
||||
type such that the referenced value is copied into a new Python
|
||||
object.</p>
|
||||
|
||||
<h4><a name="copy_const_reference-spec-synopsis"></a>Class
|
||||
<code>copy_const_reference</code> synopsis</h4>
|
||||
@@ -73,17 +86,17 @@ template <class T> struct apply
|
||||
</pre>
|
||||
|
||||
<dl class="metafunction-semantics">
|
||||
<dt><b>Requires:</b> <code>T</code> is <code>U const&</code> for some
|
||||
<code>U</code>.
|
||||
<dt><b>Requires:</b> <code>T</code> is <code>U const&</code> for
|
||||
some <code>U</code>.</dt>
|
||||
|
||||
<dt><b>Returns:</b> <code>typedef <a href=
|
||||
"to_python_value.html#to_python_value-spec">to_python_value</a><T>
|
||||
type;</code>
|
||||
type;</code></dt>
|
||||
</dl>
|
||||
|
||||
<h2><a name="examples"></a>Example</h2>
|
||||
|
||||
<h3>C++ Module Definition</h3>
|
||||
<h3>C++ Module Definition</h3>
|
||||
<pre>
|
||||
#include <boost/python/module.hpp>
|
||||
#include <boost/python/class.hpp>
|
||||
@@ -102,22 +115,18 @@ struct Foo {
|
||||
|
||||
// Wrapper code
|
||||
using namespace boost::python;
|
||||
BOOST_PYTHON_MODULE_INIT(my_module)
|
||||
BOOST_PYTHON_MODULE(my_module)
|
||||
{
|
||||
module m("my_module")
|
||||
.add(
|
||||
class_<Bar>()
|
||||
)
|
||||
.add(
|
||||
class_<Foo>()
|
||||
.def_init(args<int>())
|
||||
.def("get_bar", &Foo::get_bar
|
||||
, return_value_policy<copy_const_reference>())
|
||||
)
|
||||
class_<Bar>("Bar");
|
||||
|
||||
class_<Foo>("Foo", init<int>())
|
||||
.def("get_bar", &Foo::get_bar
|
||||
, return_value_policy<copy_const_reference>())
|
||||
;
|
||||
}
|
||||
</pre>
|
||||
<h3>Python Code</h3>
|
||||
|
||||
<h3>Python Code</h3>
|
||||
<pre>
|
||||
>>> from my_module import *
|
||||
>>> f = Foo(3) # create a Foo object
|
||||
@@ -126,10 +135,12 @@ BOOST_PYTHON_MODULE_INIT(my_module)
|
||||
|
||||
<p>Revised
|
||||
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
|
||||
15 February, 2002
|
||||
<!--webbot bot="Timestamp" endspan i-checksum="39359" -->
|
||||
13 November, 2002
|
||||
<!--webbot bot="Timestamp" endspan i-checksum="39359" -->
|
||||
</p>
|
||||
|
||||
|
||||
<p><i>© Copyright <a href="../../../../people/dave_abrahams.htm">Dave
|
||||
Abrahams</a> 2002. All Rights Reserved.</i>
|
||||
<p><i>© Copyright <a href=
|
||||
"../../../../people/dave_abrahams.htm">Dave Abrahams</a> 2002.</i></p>
|
||||
</body>
|
||||
</html>
|
||||
|
||||
|
||||
@@ -1,47 +1,59 @@
|
||||
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
|
||||
<meta name="generator" content="HTML Tidy, see www.w3.org">
|
||||
|
||||
<html>
|
||||
<head>
|
||||
<meta name="generator" content=
|
||||
"HTML Tidy for Windows (vers 1st August 2002), see www.w3.org">
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<link rel="stylesheet" type="text/css" href="../boost.css">
|
||||
|
||||
<title>Boost.Python -
|
||||
<boost/python/copy_non_const_reference.hpp></title>
|
||||
</head>
|
||||
|
||||
<body>
|
||||
<table border="0" cellpadding="7" cellspacing="0" width="100%" summary=
|
||||
"header">
|
||||
<tr>
|
||||
<td valign="top" width="300">
|
||||
<h3><a href="../../../../index.htm"><img height="86" width="277" alt=
|
||||
"C++ Boost" src="../../../../c++boost.gif" border="0"></a></h3>
|
||||
<h3><a href="../../../../index.htm"><img height="86" width="277"
|
||||
alt="C++ Boost" src="../../../../boost.png" border="0"></a></h3>
|
||||
</td>
|
||||
|
||||
<td valign="top">
|
||||
<h1 align="center">Boost.Python</h1>
|
||||
<h1 align="center"><a href="../index.html">Boost.Python</a></h1>
|
||||
|
||||
<h2 align="center">Header
|
||||
<boost/python/copy_non_const_reference.hpp></h2>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
<hr>
|
||||
|
||||
<h2>Contents</h2>
|
||||
|
||||
<dl class="page-index">
|
||||
<dt><a href="#classes">Classes</a>
|
||||
<dt><a href="#classes">Classes</a></dt>
|
||||
|
||||
<dd>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#copy_non_const_reference-spec">Class
|
||||
<code>copy_non_const_reference</code></a>
|
||||
<code>copy_non_const_reference</code></a></dt>
|
||||
|
||||
<dd>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#copy_non_const_reference-spec-synopsis">Class
|
||||
<code>copy_non_const_reference</code> synopsis</a>
|
||||
<code>copy_non_const_reference</code> synopsis</a></dt>
|
||||
|
||||
<dt><a href="#copy_non_const_reference-spec-metafunctions">Class
|
||||
<code>copy_non_const_reference</code> metafunctions</a>
|
||||
<dt><a href=
|
||||
"#copy_non_const_reference-spec-metafunctions">Class
|
||||
<code>copy_non_const_reference</code> metafunctions</a></dt>
|
||||
</dl>
|
||||
</dd>
|
||||
</dl>
|
||||
</dd>
|
||||
|
||||
<dt><a href="#examples">Example</a>
|
||||
<dt><a href="#examples">Example</a></dt>
|
||||
</dl>
|
||||
<hr>
|
||||
|
||||
@@ -51,9 +63,10 @@
|
||||
<code>copy_non_const_reference</code></h3>
|
||||
|
||||
<p><code>copy_non_const_reference</code> is a model of <a href=
|
||||
"ResultConverter.html#ResultConverterGenerator-concept">ResultConverterGenerator</a> which can be
|
||||
used to wrap C++ functions returning a reference-to-non-const type such
|
||||
that the referenced value is copied into a new Python object.
|
||||
"ResultConverter.html#ResultConverterGenerator-concept">ResultConverterGenerator</a>
|
||||
which can be used to wrap C++ functions returning a
|
||||
reference-to-non-const type such that the referenced value is copied into
|
||||
a new Python object.</p>
|
||||
|
||||
<h4><a name="copy_non_const_reference-spec-synopsis"></a>Class
|
||||
<code>copy_non_const_reference</code> synopsis</h4>
|
||||
@@ -75,16 +88,16 @@ template <class T> struct apply
|
||||
|
||||
<dl class="metafunction-semantics">
|
||||
<dt><b>Requires:</b> <code>T</code> is <code>U&</code> for some
|
||||
non-const <code>U</code>.
|
||||
non-const <code>U</code>.</dt>
|
||||
|
||||
<dt><b>Returns:</b> <code>typedef <a href=
|
||||
"to_python_value.html#to_python_value-spec">to_python_value</a><T>
|
||||
type;</code>
|
||||
type;</code></dt>
|
||||
</dl>
|
||||
|
||||
<h2><a name="examples"></a>Example</h2>
|
||||
|
||||
<p>C++ code:
|
||||
<p>C++ code:</p>
|
||||
<pre>
|
||||
#include <boost/python/module.hpp>
|
||||
#include <boost/python/class.hpp>
|
||||
@@ -103,18 +116,14 @@ struct Foo {
|
||||
|
||||
// Wrapper code
|
||||
using namespace boost::python;
|
||||
BOOST_PYTHON_MODULE_INIT(my_module)
|
||||
BOOST_PYTHON_MODULE(my_module)
|
||||
{
|
||||
module("my_module")
|
||||
.add(
|
||||
class_<Bar>()
|
||||
)
|
||||
.add(
|
||||
class_<Foo>()
|
||||
.def_init(args<int>())
|
||||
.def("get_bar", &Foo::get_bar
|
||||
, return_value_policy<copy_non_const_reference>())
|
||||
);
|
||||
class_<Bar>("Bar");
|
||||
|
||||
class_<Foo>("Foo", init<int>())
|
||||
.def("get_bar", &Foo::get_bar
|
||||
, return_value_policy<copy_non_const_reference>())
|
||||
;
|
||||
}
|
||||
</pre>
|
||||
Python Code:
|
||||
@@ -126,10 +135,12 @@ BOOST_PYTHON_MODULE_INIT(my_module)
|
||||
|
||||
<p>Revised
|
||||
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
|
||||
05 November, 2001
|
||||
<!--webbot bot="Timestamp" endspan i-checksum="39359" -->
|
||||
13 November, 2002
|
||||
<!--webbot bot="Timestamp" endspan i-checksum="39359" -->
|
||||
</p>
|
||||
|
||||
|
||||
<p><i>© Copyright <a href="../../../../people/dave_abrahams.htm">Dave
|
||||
Abrahams</a> 2002. All Rights Reserved.</i>
|
||||
<p><i>© Copyright <a href=
|
||||
"../../../../people/dave_abrahams.htm">Dave Abrahams</a> 2002.</i></p>
|
||||
</body>
|
||||
</html>
|
||||
|
||||
|
||||
@@ -1,109 +1,187 @@
|
||||
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
|
||||
<meta name="generator" content="HTML Tidy, see www.w3.org">
|
||||
|
||||
<html>
|
||||
<head>
|
||||
<meta name="generator" content=
|
||||
"HTML Tidy for Cygwin (vers 1st April 2002), see www.w3.org">
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<link rel="stylesheet" type="text/css" href="../boost.css">
|
||||
|
||||
<title>Boost.Python - <boost/python/data_members.hpp></title>
|
||||
</head>
|
||||
|
||||
<body>
|
||||
<table border="0" cellpadding="7" cellspacing="0" width="100%" summary=
|
||||
"header">
|
||||
<tr>
|
||||
<td valign="top" width="300">
|
||||
<h3><a href="../../../../index.htm"><img height="86" width="277" alt=
|
||||
"C++ Boost" src="../../../../c++boost.gif" border="0"></a></h3>
|
||||
<h3><a href="../../../../index.htm"><img height="86" width="277"
|
||||
alt="C++ Boost" src="../../../../boost.png" border="0"></a></h3>
|
||||
</td>
|
||||
|
||||
<td valign="top">
|
||||
<h1 align="center">Boost.Python</h1>
|
||||
<h1 align="center"><a href="../index.html">Boost.Python</a></h1>
|
||||
|
||||
<h2 align="center">Header <boost/python/data_members.hpp></h2>
|
||||
<h2 align="center">Header
|
||||
<boost/python/data_members.hpp></h2>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
<hr>
|
||||
|
||||
<h2>Contents</h2>
|
||||
|
||||
<dl class="page-index">
|
||||
<dt><a href="#introduction">Introduction</a>
|
||||
<dt><a href="#introduction">Introduction</a></dt>
|
||||
|
||||
<dt><a href="#functions">Functions</a>
|
||||
<dt><a href="#functions">Functions</a></dt>
|
||||
|
||||
<dd>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#make_getter-spec">make_getter</a>
|
||||
<dt><a href="#make_getter-spec">make_getter</a></dt>
|
||||
|
||||
<dt><a href="#make_setter-spec">make_setter</a>
|
||||
<dt><a href="#make_setter-spec">make_setter</a></dt>
|
||||
</dl>
|
||||
</dd>
|
||||
|
||||
<dt><a href="#examples">Example</a>
|
||||
<dt><a href="#examples">Example</a></dt>
|
||||
</dl>
|
||||
<hr>
|
||||
|
||||
<h2><a name="introduction"></a>Introduction</h2>
|
||||
|
||||
<p><code><a href="#make_getter-spec">make_getter</a>()</code> and
|
||||
<code><a href="#make_setter-spec">make_setter</a>()</code> are
|
||||
the functions used internally by <code>class_<>::<a href=
|
||||
<code><a href="#make_setter-spec">make_setter</a>()</code> are the
|
||||
functions used internally by <code>class_<>::<a href=
|
||||
"class.html#class_-spec-modifiers">def_readonly</a></code> and
|
||||
<code>class_<>::<a href=
|
||||
"class.html#class_-spec-modifiers">def_readwrite</a></code> to
|
||||
produce Python callable objects which wrap C++ data members.
|
||||
"class.html#class_-spec-modifiers">def_readwrite</a></code> to produce
|
||||
Python callable objects which wrap C++ data members.</p>
|
||||
|
||||
<h2><a name="functions"></a>Functions</h2>
|
||||
|
||||
<pre>
|
||||
<a name="make_getter-spec">template <class C, class D></a>
|
||||
objects::function* make_getter(D C::*pm);
|
||||
<a href="object.html#object-spec">object</a> make_getter(D C::*pm);
|
||||
|
||||
template <class C, class D, class Policies>
|
||||
objects::function* make_getter(D C::*pm, Policies const& policies);
|
||||
<a href=
|
||||
"object.html#object-spec">object</a> make_getter(D C::*pm, Policies const& policies);
|
||||
</pre>
|
||||
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Requires:</b> <code>Policies</code> is a model of <a
|
||||
href="CallPolicies.html">CallPolicies</a>.
|
||||
<dt><b>Requires:</b> <code>Policies</code> is a model of <a href=
|
||||
"CallPolicies.html">CallPolicies</a>.</dt>
|
||||
|
||||
<dt><b>Effects:</b> Creates a Python callable object which
|
||||
accepts a single argument that can be converted
|
||||
<code>from_python</code> to <code>C*</code>, and returns the
|
||||
corresponding member <code>D</code> member of the <code>C</code>
|
||||
object, converted <code>to_python</code>. If
|
||||
<code>policies</code> is supplied, it will be applied to the
|
||||
function as described <a href=
|
||||
"CallPolicies.html">here</a>.
|
||||
<dt><b>Effects:</b> Creates a Python callable object which accepts a
|
||||
single argument that can be converted <code>from_python</code> to
|
||||
<code>C*</code>, and returns the corresponding member <code>D</code>
|
||||
member of the <code>C</code> object, converted <code>to_python</code>.
|
||||
If <code>policies</code> is supplied, it will be applied to the
|
||||
function as described <a href="CallPolicies.html">here</a>. Otherwise,
|
||||
the library attempts to determine whether <code>D</code> is a
|
||||
user-defined class type, and if so uses <code><a href=
|
||||
"return_internal_reference.html#return_internal_reference-spec">return_internal_reference</a><></code></dt>
|
||||
|
||||
<dt><b>Returns:</b> A pointer convertible to <code>PyObject*</code> which
|
||||
refers to the new Python callable object.
|
||||
<dt>for <code>Policies</code>. Note that this test may inappropriately
|
||||
choose <code>return_internal_reference<></code> in some cases
|
||||
when <code>D</code> is a smart pointer type. This is a known
|
||||
defect.</dt>
|
||||
|
||||
<dt><b>Returns:</b> An instance of <a href=
|
||||
"object.html#object-spec">object</a> which holds the new Python
|
||||
callable object.</dt>
|
||||
</dl>
|
||||
<pre>
|
||||
template <class D>
|
||||
<a href="object.html#object-spec">object</a> make_getter(D const& d);
|
||||
template <class D, class Policies>
|
||||
<a href=
|
||||
"object.html#object-spec">object</a> make_getter(D const& d, Policies const& policies);
|
||||
|
||||
template <class D>
|
||||
<a href="object.html#object-spec">object</a> make_getter(D const* p);
|
||||
template <class D, class Policies>
|
||||
<a href=
|
||||
"object.html#object-spec">object</a> make_getter(D const* p, Policies const& policies);
|
||||
</pre>
|
||||
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Requires:</b> <code>Policies</code> is a model of <a href=
|
||||
"CallPolicies.html">CallPolicies</a>.</dt>
|
||||
|
||||
<dt><b>Effects:</b> Creates a Python callable object which accepts no
|
||||
arguments and returns <code>d</code> or <code>*p</code>, converted
|
||||
<code>to_python</code> on demand. If <code>policies</code> is supplied,
|
||||
it will be applied to the function as described <a href=
|
||||
"CallPolicies.html">here</a>. Otherwise, the library attempts to
|
||||
determine whether <code>D</code> is a user-defined class type, and if
|
||||
so uses <code><a href=
|
||||
"reference_existing_object.html#reference_existing_object-spec">reference_existing_object</a></code></dt>
|
||||
|
||||
<dt>for <code>Policies</code>.</dt>
|
||||
|
||||
<dt><b>Returns:</b> An instance of <a href=
|
||||
"object.html#object-spec">object</a> which holds the new Python
|
||||
callable object.</dt>
|
||||
</dl>
|
||||
<pre>
|
||||
<a name="make_setter-spec">template <class C, class D></a>
|
||||
objects::function* make_setter(D C::*pm);
|
||||
<a href="object.html#object-spec">object</a> make_setter(D C::*pm);
|
||||
|
||||
template <class C, class D, class Policies>
|
||||
objects::function* make_setter(D C::*pm, Policies const& policies);
|
||||
<a href=
|
||||
"object.html#object-spec">object</a> make_setter(D C::*pm, Policies const& policies);
|
||||
</pre>
|
||||
|
||||
<dl class="function*-semantics">
|
||||
<dt><b>Requires:</b> <code>Policies</code> is a model of <a
|
||||
href="CallPolicies.html">CallPolicies</a>.
|
||||
<dt><b>Requires:</b> <code>Policies</code> is a model of <a href=
|
||||
"CallPolicies.html">CallPolicies</a>.</dt>
|
||||
|
||||
<dt><b>Effects:</b> Creates a Python callable object which, when
|
||||
called from Python, expects two arguments which can be converted
|
||||
<dt><b>Effects:</b> Creates a Python callable object which, when called
|
||||
from Python, expects two arguments which can be converted
|
||||
<code>from_python</code> to <code>C*</code> and
|
||||
<code>D const&</code>, respectively, and sets the
|
||||
corresponding <code>D</code> member of the <code>C</code>
|
||||
object. If <code>policies</code> is supplied, it will be applied
|
||||
to the function as described <a
|
||||
href="CallPolicies.html">here</a>.
|
||||
corresponding <code>D</code> member of the <code>C</code> object. If
|
||||
<code>policies</code> is supplied, it will be applied to the function
|
||||
as described <a href="CallPolicies.html">here</a>.</dt>
|
||||
|
||||
<dt><b>Returns:</b> A pointer convertible to
|
||||
<code>PyObject*</code> which refers to the new Python callable
|
||||
object.
|
||||
<dt><b>Returns:</b> An instance of <a href=
|
||||
"object.html#object-spec">object</a> which holds the new Python
|
||||
callable object.</dt>
|
||||
</dl>
|
||||
<pre>
|
||||
template <class D>
|
||||
<a href="object.html#object-spec">object</a> make_setter(D& d);
|
||||
template <class D, class Policies>
|
||||
<a href=
|
||||
"object.html#object-spec">object</a> make_setter(D& d, Policies const& policies);
|
||||
|
||||
template <class D>
|
||||
<a href="object.html#object-spec">object</a> make_setter(D* p);
|
||||
template <class D, class Policies>
|
||||
<a href=
|
||||
"object.html#object-spec">object</a> make_setter(D* p, Policies const& policies);
|
||||
</pre>
|
||||
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Requires:</b> <code>Policies</code> is a model of <a href=
|
||||
"CallPolicies.html">CallPolicies</a>.</dt>
|
||||
|
||||
<dt><b>Effects:</b> Creates a Python callable object which accepts one
|
||||
argument, which is converted from Python to <code>D const&</code>
|
||||
and written into <code>d</code> or <code>*p</code>, respectively. If
|
||||
<code>policies</code> is supplied, it will be applied to the function
|
||||
as described <a href="CallPolicies.html">here</a>.</dt>
|
||||
|
||||
<dt><b>Returns:</b> An instance of <a href=
|
||||
"object.html#object-spec">object</a> which holds the new Python
|
||||
callable object.</dt>
|
||||
</dl>
|
||||
|
||||
<h2><a name="examples"></a>Example</h2>
|
||||
|
||||
<p>The code below uses make_getter and make_setter to expose a
|
||||
data member as functions:
|
||||
|
||||
<p>The code below uses make_getter and make_setter to expose a data
|
||||
member as functions:</p>
|
||||
<pre>
|
||||
#include <boost/python/data_members.hpp>
|
||||
#include <boost/python/module.hpp>
|
||||
@@ -119,14 +197,10 @@ using namespace boost::python;
|
||||
|
||||
BOOST_PYTHON_MODULE_INIT(data_members_example)
|
||||
{
|
||||
module("data_members_example")
|
||||
.add(
|
||||
class_<X>("X")
|
||||
.def_init(args<int>())
|
||||
.def("get", make_getter(&X::y))
|
||||
.def("set", make_setter(&X::y))
|
||||
)
|
||||
;
|
||||
class_<X>("X", init<int>())
|
||||
.def("get", make_getter(&X::y))
|
||||
.def("set", make_setter(&X::y))
|
||||
;
|
||||
}
|
||||
</pre>
|
||||
It can be used this way in Python:
|
||||
@@ -142,9 +216,11 @@ BOOST_PYTHON_MODULE_INIT(data_members_example)
|
||||
|
||||
<p>
|
||||
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
|
||||
8 May 2002 <!--webbot bot="Timestamp" endspan i-checksum="39359" -->
|
||||
5 August, 2003 <!--webbot bot="Timestamp" endspan i-checksum="39359" -->
|
||||
</p>
|
||||
|
||||
|
||||
<p><i>© Copyright <a href="../../../../people/dave_abrahams.htm">Dave
|
||||
Abrahams</a> 2002. All Rights Reserved.</i>
|
||||
<p><i>© Copyright <a href=
|
||||
"../../../../people/dave_abrahams.htm">Dave Abrahams</a> 2002.</i></p>
|
||||
</body>
|
||||
</html>
|
||||
|
||||
|
||||
188
doc/v2/def.html
Normal file
@@ -0,0 +1,188 @@
|
||||
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
|
||||
|
||||
<html>
|
||||
<head>
|
||||
<meta name="generator" content=
|
||||
"HTML Tidy for Cygwin (vers 1st April 2002), see www.w3.org">
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<link rel="stylesheet" type="text/css" href="../boost.css">
|
||||
|
||||
<title>Boost.Python - <boost/python/def.hpp></title>
|
||||
</head>
|
||||
|
||||
<body>
|
||||
<table border="0" cellpadding="7" cellspacing="0" width="100%" summary=
|
||||
"header">
|
||||
<tr>
|
||||
<td valign="top" width="300">
|
||||
<h3><a href="../../../../index.htm"><img height="86" width="277"
|
||||
alt="C++ Boost" src="../../../../boost.png" border="0"></a></h3>
|
||||
</td>
|
||||
|
||||
<td valign="top">
|
||||
<h1 align="center"><a href="../index.html">Boost.Python</a></h1>
|
||||
|
||||
<h2 align="center">Header <boost/python/def.hpp></h2>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
<hr>
|
||||
|
||||
<h2>Contents</h2>
|
||||
|
||||
<dl class="page-index">
|
||||
<dt><a href="#introduction">Introduction</a></dt>
|
||||
|
||||
<dt><a href="#functions">Functions</a></dt>
|
||||
|
||||
<dd>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#def-spec">def</a></dt>
|
||||
</dl>
|
||||
</dd>
|
||||
|
||||
<dt><a href="#examples">Example</a></dt>
|
||||
</dl>
|
||||
<hr>
|
||||
|
||||
<h2><a name="introduction"></a>Introduction</h2>
|
||||
|
||||
<p><code><a href="#def-spec">def</a>()</code> is the function which can
|
||||
be used to expose C++ functions and callable objects as Python functions
|
||||
in the current <code><a href="scope.html">scope</a></code>.</p>
|
||||
|
||||
<h2><a name="functions"></a>Functions</h2>
|
||||
<a name="def-spec"></a>def
|
||||
<pre>
|
||||
template <class F>
|
||||
void def(char const* name, F f);
|
||||
|
||||
template <class Fn, class A1>
|
||||
void def(char const* name, Fn fn, A1 const&);
|
||||
|
||||
template <class Fn, class A1, class A2>
|
||||
void def(char const* name, Fn fn, A1 const&, A2 const&);
|
||||
|
||||
template <class Fn, class A1, class A2, class A3>
|
||||
void def(char const* name, Fn fn, A1 const&, A2 const&, A3 const&);
|
||||
</pre>
|
||||
|
||||
<dl class="function-semantics">
|
||||
<dt><b>Requires:</b> <code>name</code> is an <a href=
|
||||
"definitions.html#ntbs">ntbs</a> which conforms to Python's <a href=
|
||||
"http://www.python.org/doc/current/ref/identifiers.html">identifier
|
||||
naming rules</a>.</dt>
|
||||
|
||||
<dd>
|
||||
<ul>
|
||||
<li>If <code>Fn</code> is [derived from] <code><a href=
|
||||
"object.html#object-spec">object</a></code>, it will be added to
|
||||
the current scope as a single overload. To be useful,
|
||||
<code>fn</code> should be <a href=
|
||||
"http://www.python.org/doc/current/lib/built-in-funcs.html#l2h-6">callable</a>.</li>
|
||||
|
||||
<li>
|
||||
If <code>a1</code> is the result of an <a href=
|
||||
"overloads.html#overload-dispatch-expression"><em>overload-dispatch-expression</em></a>,
|
||||
only the second form is allowed and fn must be a pointer to
|
||||
function or pointer to member function whose <a href=
|
||||
"definitions.html#arity">arity</a> is the same as A1's <a href=
|
||||
"overloads.html#overload-dispatch-expression"><em>maximum
|
||||
arity</em></a>.
|
||||
|
||||
<dl>
|
||||
<dt><b>Effects:</b> For each prefix <em>P</em> of
|
||||
<code>Fn</code>'s sequence of argument types, beginning with
|
||||
the one whose length is <code>A1</code>'s <a href=
|
||||
"overloads.html#overload-dispatch-expression"><em>minimum
|
||||
arity</em></a>, adds a
|
||||
<code><em>name</em>(</code>...<code>)</code> function overload
|
||||
to the <a href="scope.html">current scope</a>. Each overload
|
||||
generated invokes <code>a1</code>'s call-expression with
|
||||
<em>P</em>, using a copy of <code>a1</code>'s <a href=
|
||||
"CallPolicies.html">call policies</a>. If the longest valid
|
||||
prefix of <code>A1</code> contains <em>N</em> types and
|
||||
<code>a1</code> holds <em>M</em> keywords, an initial sequence
|
||||
of the keywords are used for all but the first
|
||||
<em>N</em> - <em>M</em> arguments of each
|
||||
overload.<br>
|
||||
</dt>
|
||||
</dl>
|
||||
</li>
|
||||
|
||||
<li>Otherwise, fn must be a non-null function or member function
|
||||
pointer, and a single function overload built around fn is added to
|
||||
the <a href="scope.html">current scope</a>. If any of
|
||||
<code>a1</code>-<code>a3</code> are supplied, they may be selected
|
||||
in any order from the table below.</li>
|
||||
</ul>
|
||||
|
||||
<table border="1" summary="def() optional arguments">
|
||||
<tr>
|
||||
<th>Memnonic Name</th>
|
||||
|
||||
<th>Requirements/Type properties</th>
|
||||
|
||||
<th>Effects</th>
|
||||
</tr>
|
||||
|
||||
<tr>
|
||||
<td>docstring</td>
|
||||
|
||||
<td>Any <a href="definitions.html#ntbs">ntbs</a>.</td>
|
||||
|
||||
<td>Value will be bound to the <code>__doc__</code> attribute of
|
||||
the resulting method overload.</td>
|
||||
</tr>
|
||||
|
||||
<tr>
|
||||
<td>policies</td>
|
||||
|
||||
<td>A model of <a href="CallPolicies.html">CallPolicies</a></td>
|
||||
|
||||
<td>A copy will be used as the call policies of the resulting
|
||||
method overload.</td>
|
||||
</tr>
|
||||
|
||||
<tr>
|
||||
<td>keywords</td>
|
||||
|
||||
<td>The result of a <a href=
|
||||
"args.html#keyword-expression"><em>keyword-expression</em></a>
|
||||
specifying no more arguments than the <a href=
|
||||
"definitions.html#arity">arity</a> of <code>fn</code>.</td>
|
||||
|
||||
<td>A copy will be used as the call policies of the resulting
|
||||
method overload.</td>
|
||||
</tr>
|
||||
</table>
|
||||
</dd>
|
||||
</dl>
|
||||
|
||||
<h2><a name="examples"></a>Example</h2>
|
||||
<pre>
|
||||
#include <boost/python/def.hpp>
|
||||
#include <boost/python/module.hpp>
|
||||
#include <boost/python/args.hpp>
|
||||
|
||||
using namespace boost::python;
|
||||
|
||||
char const* foo(int x, int y) { return "foo"; }
|
||||
|
||||
BOOST_PYTHON_MODULE(def_test)
|
||||
{
|
||||
def("foo", foo, args("x", "y"), "foo's docstring");
|
||||
}
|
||||
</pre>
|
||||
|
||||
<p>
|
||||
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
|
||||
7 March, 2003
|
||||
<!--webbot bot="Timestamp" endspan i-checksum="39359" -->
|
||||
</p>
|
||||
|
||||
<p><i>© Copyright <a href=
|
||||
"../../../../people/dave_abrahams.htm">Dave Abrahams</a> 2002.</i></p>
|
||||
</body>
|
||||
</html>
|
||||
|
||||
135
doc/v2/def_visitor.html
Normal file
@@ -0,0 +1,135 @@
|
||||
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
|
||||
<meta name="generator" content="Microsoft FrontPage 5.0">
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<link rel="stylesheet" type="text/css" href="../boost.css">
|
||||
|
||||
<title>Boost.Python - <boost/python/def_visitor.hpp></title>
|
||||
|
||||
<table border="0" cellpadding="7" cellspacing="0" width="100%" summary=
|
||||
"header">
|
||||
<tr>
|
||||
<td valign="top" width="300">
|
||||
<h3><a href="../../../../index.htm"><img height="86" width="277" alt=
|
||||
"C++ Boost" src="../../../../boost.png" border="0"></a></h3>
|
||||
|
||||
<td valign="top">
|
||||
<h1 align="center"><a href="../index.html"><font size="7">Boost.Python</font></a></h1>
|
||||
|
||||
<h2 align="center">Header <boost/python/def_visitor.hpp></h2>
|
||||
</table>
|
||||
<hr>
|
||||
|
||||
<h2>Contents</h2>
|
||||
|
||||
|
||||
<dl class="page-index">
|
||||
<dt><a href="#introduction">Introduction</a>
|
||||
<dt><a href="#classes">Classes</a>
|
||||
<dd>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#def_visitor-spec">Class <code>def_visitor</code></a>
|
||||
<dd> <a href="#def_visitor-synopsis">Class <code>def_visitor</code>
|
||||
synopsis</a></dd>
|
||||
<dd> <a href="#def_visitor-requirements">Class <code>def_visitor</code>
|
||||
requirements</a></dd>
|
||||
</dl>
|
||||
<dt><a href="#examples">Example</a>
|
||||
</dl>
|
||||
<hr>
|
||||
|
||||
<h2><a name="introduction"></a>Introduction</h2>
|
||||
|
||||
|
||||
<p><code><boost/python/def_visitor.hpp></code> provides a generic visitation
|
||||
interface through which the <a href="class.html">class_</a> <b>def</b> member
|
||||
functionality can be extended non-intrusively to avoid cluttering the <a href="class.html">class_</a>
|
||||
interface. It declares the <code>def_visitor<T> </code>class template,
|
||||
which is parameterized on the derived type <tt>DerivedVisitor</tt>, which provides
|
||||
the actual <b>def</b> functionality through its <b>visit</b> member functions.
|
||||
<h2><a name="classes"></a>Classes</h2>
|
||||
|
||||
<h3><a name="def_visitor-spec"></a>Class template <code>def_visitor<DerivedVisitor></code></h3>
|
||||
|
||||
|
||||
<p>The class def_visitor is a base class paramaterized by its derived class. The
|
||||
def_visitor class is a protocol class. Its derived class, DerivedVisitor, is
|
||||
expected to have a member function visit. The def_visitor class is never instantiated
|
||||
directly. Instead, an instance of its subclass, DerivedVisitor, is passed
|
||||
on as an argument to the <a href="class.html">class_</a> def member function.
|
||||
<h4>
|
||||
<a name="def_visitor-synopsis" id="def_visitor-synopsis"></a>Class <code>def_visitor </code>synopsis</h4>
|
||||
<pre>namespace boost { namespace python {
|
||||
|
||||
template <class DerivedVisitor>
|
||||
class def_visitor {};
|
||||
}</pre>
|
||||
<h3><a name="def_visitor-requirements"></a><code>def_visitor </code>requirements</h3>
|
||||
|
||||
|
||||
<p>The <span class="pre">client supplied class </span><span class="pre"></span><tt class="literal"><span class="pre">DerivedVisitor</span></tt>
|
||||
template parameter is expected to:
|
||||
<ul>
|
||||
<li>be privately derived from def_visitor</li>
|
||||
<li>grant friend access to class def_visitor_access</li>
|
||||
<li>define either or both visit member functions listed in the table below:</li>
|
||||
</ul>
|
||||
|
||||
|
||||
<table border class="table">
|
||||
<tr>
|
||||
<td width="181" nowrap><b>Expression</b></td>
|
||||
<td width="85"><b>Return Type</b></td>
|
||||
<td width="330"><b>Requirements</b></td>
|
||||
<td width="259"><b>Effects</b></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td nowrap>visitor.visit(cls)</td>
|
||||
<td>void</td>
|
||||
<td>cls is an instance of a <a href="class.html">class_</a> being wrapped
|
||||
to Python. visitor is a def_visitor derived class.</td>
|
||||
<td>A call to cls.def(visitor) forwards to this member function.</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td nowrap>visitor.visit(cls, name, options)</td>
|
||||
<td>void</td>
|
||||
<td>cls is a class_ instance, name is a C string. visitor is a def_visitor
|
||||
derived class. options is a context specific optional argument.</td>
|
||||
<td>A call to cls.def(name, visitor) or cls.def(name, visitor, options) forwards
|
||||
to this member function. </td>
|
||||
</tr>
|
||||
</table>
|
||||
|
||||
<h2><a name="examples"></a>Example</h2>
|
||||
|
||||
|
||||
<pre>class X {/*...*/};<br>
|
||||
class my_def_visitor : boost::python::def_visitor<my_def_visitor>
|
||||
{
|
||||
friend class def_visitor_access;
|
||||
|
||||
template <class classT>
|
||||
void visit(classT& c) const
|
||||
{
|
||||
c
|
||||
.def("foo", &my_def_visitor::foo)
|
||||
.def("bar", &my_def_visitor::bar)
|
||||
;
|
||||
}
|
||||
|
||||
static void foo(X& self);
|
||||
static void bar(X& self);
|
||||
};
|
||||
|
||||
BOOST_PYTHON_MODULE(my_ext)
|
||||
{
|
||||
class_<X>("X")
|
||||
.def(my_def_visitor())
|
||||
;
|
||||
}
|
||||
</pre>
|
||||
<p>Revised
|
||||
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->27 August, 2003<!--webbot bot="Timestamp" endspan i-checksum="34484" -->
|
||||
</p>
|
||||
|
||||
|
||||
<p><i>© Copyright Joel de Guzman 2003. </i>
|
||||
@@ -11,10 +11,10 @@
|
||||
<tr>
|
||||
<td valign="top" width="300">
|
||||
<h3><a href="../../../../index.htm"><img height="86" width="277" alt=
|
||||
"C++ Boost" src="../../../../c++boost.gif" border="0"></a></h3>
|
||||
"C++ Boost" src="../../../../boost.png" border="0"></a></h3>
|
||||
|
||||
<td valign="top">
|
||||
<h1 align="center">Boost.Python</h1>
|
||||
<h1 align="center"><a href="../index.html">Boost.Python</a></h1>
|
||||
|
||||
<h2 align="center">Header
|
||||
<boost/python/default_call_policies.hpp></h2>
|
||||
@@ -161,10 +161,10 @@ struct return_value_policy : Base
|
||||
|
||||
<p>Revised
|
||||
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
|
||||
05 November, 2001
|
||||
<!--webbot bot="Timestamp" endspan i-checksum="39359" -->
|
||||
13 November, 2002
|
||||
<!--webbot bot="Timestamp" endspan i-checksum="39359" -->
|
||||
|
||||
|
||||
<p><i>© Copyright <a href="../../../../people/dave_abrahams.htm">Dave
|
||||
Abrahams</a> 2002. All Rights Reserved.</i>
|
||||
Abrahams</a> 2002. </i>
|
||||
|
||||
|
||||
@@ -1,35 +1,99 @@
|
||||
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
|
||||
|
||||
<html>
|
||||
<head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<link rel="stylesheet" type="text/css" href="../boost.css">
|
||||
<title>Boost.Python - Definitions</title>
|
||||
</head>
|
||||
<body link="#0000ff" vlink="#800080">
|
||||
<table border="0" cellpadding="7" cellspacing="0" width="100%" summary=
|
||||
<head>
|
||||
<meta name="generator" content=
|
||||
"HTML Tidy for Windows (vers 1st August 2002), see www.w3.org">
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<link rel="stylesheet" type="text/css" href="../boost.css">
|
||||
|
||||
<title>Boost.Python - Definitions</title>
|
||||
</head>
|
||||
|
||||
<body link="#0000ff" vlink="#800080">
|
||||
<table border="0" cellpadding="7" cellspacing="0" width="100%" summary=
|
||||
"header">
|
||||
<tr>
|
||||
<td valign="top" width="300">
|
||||
<h3><a href="../../../../index.htm"><img height="86" width="277" alt=
|
||||
"C++ Boost" src="../../../../c++boost.gif" border="0"></a></h3>
|
||||
</td>
|
||||
<td valign="top">
|
||||
<h1 align="center">Boost.Python</h1>
|
||||
<h2 align="center">Definitions</h2>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
<hr>
|
||||
<dl class="definitions">
|
||||
<dt><b>{{term}}:</b> {{definition}}</dt>
|
||||
<dt><b>{{term}}:</b> {{definition}}</dt>
|
||||
</dl>
|
||||
<hr>
|
||||
<p>Revised
|
||||
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
|
||||
05 November, 2002
|
||||
<tr>
|
||||
<td valign="top" width="300">
|
||||
<h3><a href="../../../../index.htm"><img height="86" width="277"
|
||||
alt="C++ Boost" src="../../../../boost.png" border="0"></a></h3>
|
||||
</td>
|
||||
|
||||
<td valign="top">
|
||||
<h1 align="center"><a href="../index.html">Boost.Python</a></h1>
|
||||
|
||||
<h2 align="center">Definitions</h2>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
<hr>
|
||||
|
||||
<dl class="definitions">
|
||||
<dt><b><a name="arity">arity</a>:</b> The number of arguments accepted
|
||||
by a function or member function. Unless otherwise specified, the
|
||||
hidden "<code>this</code>" argument to member functions is not counted
|
||||
when specifying arity</dt>
|
||||
|
||||
<dd><br>
|
||||
</dd>
|
||||
|
||||
<dt><b><a name="ntbs">ntbs</a>:</b> Null-Terminated Byte String, or
|
||||
`C'-string. C++ string literals are <strong>ntbs</strong>es. An
|
||||
<strong>ntbs</strong> must never be null.</dt>
|
||||
|
||||
<dd><br>
|
||||
</dd>
|
||||
|
||||
<dt><b><a name="raise">raise</a>:</b> Exceptions in Python are
|
||||
"raised", not "thrown", as they are in C++. When this documentation
|
||||
says that some Python exception is "raised" in the context of C++ code,
|
||||
it means that the corresponding Python exception is set via the <a
|
||||
href=
|
||||
"http://www.python.org/doc/current/api/exceptionHandling.html">Python/'C'
|
||||
API</a>, and <code><a href=
|
||||
"errors.html#throw_error_already_set-spec">throw_error_already_set</a>()</code>
|
||||
is called.</dt>
|
||||
|
||||
<dd><br>
|
||||
</dd>
|
||||
|
||||
<dt><b><a name="POD">POD</a>:</b> A technical term from the C++
|
||||
standard. Short for "Plain Ol'Data": A POD-struct is an aggregate class
|
||||
that has no non-static data members of type pointer to member,
|
||||
non-POD-struct, non-POD-union (or array of such types) or reference,
|
||||
and has no user-defined copy assign- ment operator and no user-defined
|
||||
destructor. Similarly, a POD-union is an aggregate union that has no
|
||||
non-static data members of type pointer to member, non-POD-struct,
|
||||
non-POD-union (or array of such types) or reference, and has no
|
||||
user-defined copy assignment operator and no user-defined destructor. A
|
||||
POD class is a class that is either a POD-struct or a POD-union. An
|
||||
aggregate is an array or a class (clause 9) with no user-declared
|
||||
constructors (12.1), no private or protected non-static data members
|
||||
(clause 11), no base classes (clause 10), and no virtual functions
|
||||
(10.3).</dt>
|
||||
|
||||
<dd><br>
|
||||
</dd>
|
||||
|
||||
<dt><b><a name="ODR">ODR</a>:</b> The "One Definition
|
||||
Rule", which says that any entity in a C++ program must have the same definition in all translation units (object files) which make up a program.
|
||||
</dt>
|
||||
|
||||
<dd><br>
|
||||
</dd>
|
||||
|
||||
|
||||
</dl>
|
||||
<hr>
|
||||
|
||||
<p>Revised
|
||||
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
|
||||
13 November, 2002
|
||||
<!--webbot bot="Timestamp" endspan i-checksum="39359" -->
|
||||
</p>
|
||||
<p><i>© Copyright <a href="../../../../people/dave_abrahams.htm">Dave Abrahams</a>
|
||||
2002. All Rights Reserved.</i></p>
|
||||
</body>
|
||||
</p>
|
||||
|
||||
<p><i>© Copyright <a href=
|
||||
"../../../../people/dave_abrahams.htm">Dave Abrahams</a> 2002.</i></p>
|
||||
</body>
|
||||
</html>
|
||||
|
||||
|
||||
149
doc/v2/dict.html
Normal file
@@ -0,0 +1,149 @@
|
||||
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
|
||||
|
||||
<html>
|
||||
<head>
|
||||
<meta name="generator" content=
|
||||
"HTML Tidy for Windows (vers 1st August 2002), see www.w3.org">
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<link rel="stylesheet" type="text/css" href="../boost.css">
|
||||
|
||||
<title>Boost.Python - <boost/python/dict.hpp></title>
|
||||
</head>
|
||||
|
||||
<body>
|
||||
<table border="0" cellpadding="7" cellspacing="0" width="100%" summary=
|
||||
"header">
|
||||
<tr>
|
||||
<td valign="top" width="300">
|
||||
<h3><a href="../../../../index.htm"><img height="86" width="277"
|
||||
alt="C++ Boost" src="../../../../boost.png" border="0"></a></h3>
|
||||
</td>
|
||||
|
||||
<td valign="top">
|
||||
<h1 align="center"><a href="../index.html">Boost.Python</a></h1>
|
||||
|
||||
<h2 align="center">Header <boost/python/dict.hpp></h2>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
<hr>
|
||||
|
||||
<h2>Contents</h2>
|
||||
|
||||
<dl class="page-index">
|
||||
<dt><a href="#introduction">Introduction</a></dt>
|
||||
|
||||
<dt><a href="#classes">Classes</a></dt>
|
||||
|
||||
<dd>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#dict-spec">Class <code>dict</code></a></dt>
|
||||
|
||||
<dd>
|
||||
<dl class="page-index">
|
||||
<dt><a href="#dict-spec-synopsis">Class <code>dict</code>
|
||||
synopsis</a></dt>
|
||||
</dl>
|
||||
</dd>
|
||||
</dl>
|
||||
</dd>
|
||||
|
||||
<dt><a href="#examples">Example(s)</a></dt>
|
||||
</dl>
|
||||
<hr>
|
||||
|
||||
<h2><a name="introduction"></a>Introduction</h2>
|
||||
|
||||
<p>Exposes a <a href=
|
||||
"ObjectWrapper.html#TypeWrapper-concept">TypeWrapper</a> for the Python
|
||||
<a href=
|
||||
"http://www.python.org/dev/doc/devel/lib/typesmapping.html">dict</a>
|
||||
type.</p>
|
||||
|
||||
<h2><a name="classes"></a>Classes</h2>
|
||||
|
||||
<h3><a name="dict-spec"></a>Class <code>dict</code></h3>
|
||||
|
||||
<p>Exposes the <a href=
|
||||
"http://www.python.org/dev/doc/devel/lib/typesmapping.html">mapping
|
||||
protocol</a> of Python's built-in <code>dict</code> type. The semantics
|
||||
of the constructors and member functions defined below can be fully
|
||||
understood by reading the <a href=
|
||||
"ObjectWrapper.html#TypeWrapper-concept">TypeWrapper</a> concept
|
||||
definition. Since <code>dict</code> is publicly derived from <code><a
|
||||
href="object.html#object-spec">object</a></code>, the public object
|
||||
interface applies to <code>dict</code> instances as well.</p>
|
||||
|
||||
<h4><a name="dict-spec-synopsis"></a>Class <code>dict</code>
|
||||
synopsis</h4>
|
||||
<pre>
|
||||
namespace boost { namespace python
|
||||
{
|
||||
class dict : public object
|
||||
{
|
||||
dict();
|
||||
|
||||
template< class T >
|
||||
dict(T const & data);
|
||||
|
||||
// modifiers
|
||||
void clear();
|
||||
dict copy();
|
||||
|
||||
template <class T1, class T2>
|
||||
tuple popitem();
|
||||
|
||||
template <class T>
|
||||
object setdefault(T const &k);
|
||||
|
||||
template <class T1, class T2>
|
||||
object setdefault(T1 const & k, T2 const & d);
|
||||
|
||||
void update(object_cref E);
|
||||
|
||||
template< class T >
|
||||
void update(T const & E);
|
||||
|
||||
// observers
|
||||
list values() const;
|
||||
|
||||
object get(object_cref k) const;
|
||||
|
||||
template<class T>
|
||||
object get(T const & k) const;
|
||||
|
||||
object get(object_cref k, object_cref d) const;
|
||||
object get(T1 const & k, T2 const & d) const;
|
||||
|
||||
bool has_key(object_cref k) const;
|
||||
|
||||
template< class T >
|
||||
bool has_key(T const & k) const;
|
||||
|
||||
list items() const;
|
||||
object iteritems() const;
|
||||
object iterkeys() const;
|
||||
object itervalues() const;
|
||||
list keys() const;
|
||||
};
|
||||
}}
|
||||
</pre>
|
||||
|
||||
<h2><a name="examples"></a>Example</h2>
|
||||
<pre>
|
||||
using namespace boost::python;
|
||||
dict swap_object_dict(object target, dict d)
|
||||
{
|
||||
dict result = extract<dict>(target.attr("__dict__"));
|
||||
target.attr("__dict__") = d;
|
||||
return result;
|
||||
}
|
||||
</pre>
|
||||
|
||||
<p>Revised 30 September, 2002</p>
|
||||
|
||||
<p><i>© Copyright <a href=
|
||||
"../../../../people/dave_abrahams.htm">Dave Abrahams</a> 2002.</i></p>
|
||||
</body>
|
||||
</html>
|
||||
|
||||