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120 lines
3.6 KiB
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120 lines
3.6 KiB
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<meta name="generator" content="HTML Tidy, 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/pointee.hpp></title>
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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" alt=
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"C++ Boost" src="../../../../boost.png" border="0"></a></h3>
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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/pointee.hpp></h2>
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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>
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<dt><a href="#classes">Classes</a>
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<dd>
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<dl class="page-index">
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<dt><a href="#pointee-spec">Class Template<code>pointee</code></a>
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<dd>
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<dl class="page-index">
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<dt><a href="#pointee-spec-synopsis">Class Template
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<code>pointee</code> synopsis</a>
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</dl>
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</dl>
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<dt><a href="#examples">Example</a>
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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><boost/python/pointee.hpp></code> introduces a
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traits <a
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href="../../../mpl/doc/refmanual/metafunction.html">metafunction</a>
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template <code>pointee<T></code> that can be used to extract the "pointed-to" type from the type of a pointer or smart pointer.
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<h2><a name="classes"></a>Classes</h2>
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<h3><a name="pointee-spec"></a>Class Template <code>pointee<class T></code></h3>
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<p><code>pointee<T></code> is used by the <code><a
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href="class.html#class_-spec">class_</a><...></code>
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template to deduce the type being held when a pointer or smart
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pointer type is used as its <code>HeldType</code> argument.
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<h4><a name="pointee-spec-synopsis"></a>Class Template
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<code>pointee</code> synopsis</h4>
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<pre>
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namespace boost { namespace python
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{
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template <class T> struct pointee
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{
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typedef T::element_type type;
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};
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// specialization for pointers
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template <T> struct pointee<T*>
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{
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typedef T type;
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};
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}
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</pre>
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<h2><a name="examples"></a>Example</h2>
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Given a 3rd-party smart pointer type
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<code>smart_pointer<T></code>, one might partially specialize
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<code>pointee<smart_pointer<T> ></code> so that it can be
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used as the <code>HeldType</code> for a class wrapper:
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<pre>
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#include <boost/python/pointee.hpp>
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#include <boost/python/class.hpp>
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#include <third_party_lib.hpp>
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namespace boost { namespace python
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{
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template <class T> struct pointee<smart_pointer<T> >
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{
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typedef T type;
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};
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}}
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BOOST_PYTHON_MODULE(pointee_demo)
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{
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class_<third_party_class, smart_pointer<third_party_class> >("third_party_class")
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.def(...)
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...
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;
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}
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</pre>
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<p>Revised
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<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
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13 November, 2002
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<!--webbot bot="Timestamp" endspan i-checksum="39359" -->
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<p><i>© Copyright <a href="http://www.boost.org/people/dave_abrahams.htm">Dave
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Abrahams</a> 2002. </i> Distributed
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under the Boost Software License, Version 1.0. (See accompanying file
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LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)</p>
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