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230 lines
8.2 KiB
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<!-- Copyright David Abrahams 2006. Distributed under the Boost -->
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<!-- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) -->
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<html>
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<meta name="generator" content=
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"HTML Tidy for Cygwin (vers 1st April 2002), see www.w3.org">
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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<link rel="stylesheet" type="text/css" href="../boost.css">
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<title>Boost.Python - <boost/python/data_members.hpp></title>
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</head>
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<body>
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<table border="0" cellpadding="7" cellspacing="0" width="100%" summary=
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"header">
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<tr>
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<td valign="top" width="300">
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<h3><a href="../../../../index.htm"><img height="86" width="277"
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alt="C++ Boost" src="../../../../boost.png" border="0"></a></h3>
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</td>
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<td valign="top">
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<h1 align="center"><a href="../index.html">Boost.Python</a></h1>
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<h2 align="center">Header
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<boost/python/data_members.hpp></h2>
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</td>
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</tr>
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</table>
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<hr>
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<h2>Contents</h2>
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<dl class="page-index">
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<dt><a href="#introduction">Introduction</a></dt>
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<dt><a href="#functions">Functions</a></dt>
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<dd>
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<dl class="page-index">
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<dt><a href="#make_getter-spec">make_getter</a></dt>
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<dt><a href="#make_setter-spec">make_setter</a></dt>
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</dl>
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</dd>
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<dt><a href="#examples">Example</a></dt>
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</dl>
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<hr>
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<h2><a name="introduction"></a>Introduction</h2>
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<p><code><a href="#make_getter-spec">make_getter</a>()</code> and
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<code><a href="#make_setter-spec">make_setter</a>()</code> are the
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functions used internally by <code>class_<>::<a href=
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"class.html#class_-spec-modifiers">def_readonly</a></code> and
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<code>class_<>::<a href=
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"class.html#class_-spec-modifiers">def_readwrite</a></code> to produce
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Python callable objects which wrap C++ data members.</p>
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<h2><a name="functions"></a>Functions</h2>
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<pre>
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<a name="make_getter-spec">template <class C, class D></a>
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<a href="object.html#object-spec">object</a> make_getter(D C::*pm);
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template <class C, class D, class Policies>
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<a href=
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"object.html#object-spec">object</a> make_getter(D C::*pm, Policies const& policies);
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</pre>
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<dl class="function-semantics">
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<dt><b>Requires:</b> <code>Policies</code> is a model of <a href=
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"CallPolicies.html">CallPolicies</a>.</dt>
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<dt><b>Effects:</b> Creates a Python callable object which accepts a
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single argument that can be converted <code>from_python</code> to
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<code>C*</code>, and returns the corresponding member <code>D</code>
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member of the <code>C</code> object, converted <code>to_python</code>.
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If <code>policies</code> is supplied, it will be applied to the
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function as described <a href="CallPolicies.html">here</a>. Otherwise,
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the library attempts to determine whether <code>D</code> is a
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user-defined class type, and if so uses <code><a href=
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"return_internal_reference.html#return_internal_reference-spec">return_internal_reference</a><></code></dt>
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<dt>for <code>Policies</code>. Note that this test may inappropriately
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choose <code>return_internal_reference<></code> in some cases
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when <code>D</code> is a smart pointer type. This is a known
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defect.</dt>
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<dt><b>Returns:</b> An instance of <a href=
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"object.html#object-spec">object</a> which holds the new Python
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callable object.</dt>
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</dl>
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<pre>
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template <class D>
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<a href="object.html#object-spec">object</a> make_getter(D const& d);
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template <class D, class Policies>
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<a href=
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"object.html#object-spec">object</a> make_getter(D const& d, Policies const& policies);
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template <class D>
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<a href="object.html#object-spec">object</a> make_getter(D const* p);
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template <class D, class Policies>
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<a href=
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"object.html#object-spec">object</a> make_getter(D const* p, Policies const& policies);
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</pre>
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<dl class="function-semantics">
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<dt><b>Requires:</b> <code>Policies</code> is a model of <a href=
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"CallPolicies.html">CallPolicies</a>.</dt>
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<dt><b>Effects:</b> Creates a Python callable object which accepts no
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arguments and returns <code>d</code> or <code>*p</code>, converted
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<code>to_python</code> on demand. If <code>policies</code> is supplied,
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it will be applied to the function as described <a href=
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"CallPolicies.html">here</a>. Otherwise, the library attempts to
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determine whether <code>D</code> is a user-defined class type, and if
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so uses <code><a href=
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"reference_existing_object.html#reference_existing_object-spec">reference_existing_object</a></code></dt>
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<dt>for <code>Policies</code>.</dt>
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<dt><b>Returns:</b> An instance of <a href=
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"object.html#object-spec">object</a> which holds the new Python
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callable object.</dt>
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</dl>
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<pre>
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<a name="make_setter-spec">template <class C, class D></a>
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<a href="object.html#object-spec">object</a> make_setter(D C::*pm);
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template <class C, class D, class Policies>
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<a href=
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"object.html#object-spec">object</a> make_setter(D C::*pm, Policies const& policies);
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</pre>
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<dl class="function*-semantics">
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<dt><b>Requires:</b> <code>Policies</code> is a model of <a href=
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"CallPolicies.html">CallPolicies</a>.</dt>
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<dt><b>Effects:</b> Creates a Python callable object which, when called
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from Python, expects two arguments which can be converted
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<code>from_python</code> to <code>C*</code> and
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<code>D const&</code>, respectively, and sets the
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corresponding <code>D</code> member of the <code>C</code> object. If
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<code>policies</code> is supplied, it will be applied to the function
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as described <a href="CallPolicies.html">here</a>.</dt>
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<dt><b>Returns:</b> An instance of <a href=
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"object.html#object-spec">object</a> which holds the new Python
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callable object.</dt>
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</dl>
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<pre>
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template <class D>
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<a href="object.html#object-spec">object</a> make_setter(D& d);
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template <class D, class Policies>
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<a href=
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"object.html#object-spec">object</a> make_setter(D& d, Policies const& policies);
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template <class D>
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<a href="object.html#object-spec">object</a> make_setter(D* p);
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template <class D, class Policies>
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<a href=
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"object.html#object-spec">object</a> make_setter(D* p, Policies const& policies);
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</pre>
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<dl class="function-semantics">
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<dt><b>Requires:</b> <code>Policies</code> is a model of <a href=
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"CallPolicies.html">CallPolicies</a>.</dt>
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<dt><b>Effects:</b> Creates a Python callable object which accepts one
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argument, which is converted from Python to <code>D const&</code>
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and written into <code>d</code> or <code>*p</code>, respectively. If
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<code>policies</code> is supplied, it will be applied to the function
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as described <a href="CallPolicies.html">here</a>.</dt>
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<dt><b>Returns:</b> An instance of <a href=
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"object.html#object-spec">object</a> which holds the new Python
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callable object.</dt>
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</dl>
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<h2><a name="examples"></a>Example</h2>
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<p>The code below uses make_getter and make_setter to expose a data
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member as functions:</p>
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<pre>
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#include <boost/python/data_members.hpp>
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#include <boost/python/module.hpp>
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#include <boost/python/class.hpp>
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struct X
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{
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X(int x) : y(x) {}
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int y;
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};
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using namespace boost::python;
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BOOST_PYTHON_MODULE_INIT(data_members_example)
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{
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class_<X>("X", init<int>())
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.def("get", make_getter(&X::y))
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.def("set", make_setter(&X::y))
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;
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}
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</pre>
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It can be used this way in Python:
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<pre>
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>>> from data_members_example import *
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>>> x = X(1)
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>>> x.get()
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1
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>>> x.set(2)
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>>> x.get()
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2
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</pre>
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<p>
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<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
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5 August, 2003 <!--webbot bot="Timestamp" endspan i-checksum="39359" -->
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</p>
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<p><i>© Copyright <a href=
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"../../../../people/dave_abrahams.htm">Dave Abrahams</a> 2002.</i></p>
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</body>
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</html>
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