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192 lines
6.5 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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<!-- Software License, Version 1.0. (See accompanying -->
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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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<head>
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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/def.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 <boost/python/def.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="#def-spec">def</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="#def-spec">def</a>()</code> is the function which can
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be used to expose C++ functions and callable objects as Python functions
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in the current <code><a href="scope.html">scope</a></code>.</p>
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<h2><a name="functions"></a>Functions</h2>
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<a name="def-spec"></a>def
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<pre>
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template <class F>
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void def(char const* name, F f);
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template <class Fn, class A1>
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void def(char const* name, Fn fn, A1 const&);
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template <class Fn, class A1, class A2>
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void def(char const* name, Fn fn, A1 const&, A2 const&);
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template <class Fn, class A1, class A2, class A3>
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void def(char const* name, Fn fn, A1 const&, A2 const&, A3 const&);
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</pre>
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<dl class="function-semantics">
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<dt><b>Requires:</b> <code>name</code> is an <a href=
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"definitions.html#ntbs">ntbs</a> which conforms to Python's <a href=
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"http://www.python.org/doc/current/ref/identifiers.html">identifier
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naming rules</a>.</dt>
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<dd>
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<ul>
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<li>If <code>Fn</code> is [derived from] <code><a href=
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"object.html#object-spec">object</a></code>, it will be added to
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the current scope as a single overload. To be useful,
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<code>fn</code> should be <a href=
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"http://www.python.org/doc/current/lib/built-in-funcs.html#l2h-6">callable</a>.</li>
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<li>
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If <code>a1</code> is the result of an <a href=
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"overloads.html#overload-dispatch-expression"><em>overload-dispatch-expression</em></a>,
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only the second form is allowed and fn must be a pointer to
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function or pointer to member function whose <a href=
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"definitions.html#arity">arity</a> is the same as A1's <a href=
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"overloads.html#overload-dispatch-expression"><em>maximum
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arity</em></a>.
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<dl>
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<dt><b>Effects:</b> For each prefix <em>P</em> of
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<code>Fn</code>'s sequence of argument types, beginning with
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the one whose length is <code>A1</code>'s <a href=
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"overloads.html#overload-dispatch-expression"><em>minimum
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arity</em></a>, adds a
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<code><em>name</em>(</code>...<code>)</code> function overload
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to the <a href="scope.html">current scope</a>. Each overload
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generated invokes <code>a1</code>'s call-expression with
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<em>P</em>, using a copy of <code>a1</code>'s <a href=
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"CallPolicies.html">call policies</a>. If the longest valid
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prefix of <code>A1</code> contains <em>N</em> types and
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<code>a1</code> holds <em>M</em> keywords, an initial sequence
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of the keywords are used for all but the first
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<em>N</em> - <em>M</em> arguments of each
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overload.<br>
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</dt>
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</dl>
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</li>
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<li>Otherwise, fn must be a non-null function or member function
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pointer, and a single function overload built around fn is added to
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the <a href="scope.html">current scope</a>. If any of
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<code>a1</code>-<code>a3</code> are supplied, they may be selected
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in any order from the table below.</li>
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</ul>
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<table border="1" summary="def() optional arguments">
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<tr>
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<th>Memnonic Name</th>
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<th>Requirements/Type properties</th>
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<th>Effects</th>
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</tr>
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<tr>
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<td>docstring</td>
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<td>Any <a href="definitions.html#ntbs">ntbs</a>.</td>
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<td>Value will be bound to the <code>__doc__</code> attribute of
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the resulting method overload.</td>
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</tr>
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<tr>
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<td>policies</td>
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<td>A model of <a href="CallPolicies.html">CallPolicies</a></td>
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<td>A copy will be used as the call policies of the resulting
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method overload.</td>
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</tr>
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<tr>
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<td>keywords</td>
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<td>The result of a <a href=
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"args.html#keyword-expression"><em>keyword-expression</em></a>
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specifying no more arguments than the <a href=
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"definitions.html#arity">arity</a> of <code>fn</code>.</td>
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<td>A copy will be used as the call policies of the resulting
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method overload.</td>
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</tr>
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</table>
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</dd>
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</dl>
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<h2><a name="examples"></a>Example</h2>
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<pre>
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#include <boost/python/def.hpp>
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#include <boost/python/module.hpp>
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#include <boost/python/args.hpp>
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using namespace boost::python;
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char const* foo(int x, int y) { return "foo"; }
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BOOST_PYTHON_MODULE(def_test)
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{
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def("foo", foo, args("x", "y"), "foo's docstring");
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}
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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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7 March, 2003
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<!--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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