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-<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
- <meta name="generator" content="HTML Tidy, 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 - &lt;boost/python/to_python_indirect.hpp&gt;</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">Boost.Python</a></h1>
-
- <h2 align="center">Header &lt;boost/python/to_python_indirect.hpp&gt;</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="#to_python_indirect-spec">Class Template <code>to_python_indirect</code></a>
-
- <dd>
- <dl class="page-index">
-
- <dt><a href="#to_python_indirect-spec-synopsis">Class Template
- <code>to_python_indirect</code> synopsis</a>
-
- <dt><a href="#to_python_indirect-spec-observers">Class Template
- <code>to_python_indirect</code> observer functions</a>
-
- <dt><a href="#to_python_indirect-spec-statics">Class Template
- <code>to_python_indirect</code> static functions</a>
- </dl>
- </dl>
-
- <dt><a href="#examples">Example</a>
- </dl>
- <hr>
-
- <h2><a name="introduction"></a>Introduction</h2>
-
- <code>&lt;boost/python/to_python_indirect.hpp&gt;</code> supplies
- a way to construct new Python objects that hold wrapped C++ class
- instances via a pointer or smart pointer.
-
- <h2><a name="classes"></a>Classes</h2>
-
- <h3><a name="to_python_indirect-spec"></a>Class template <code>to_python_indirect</code></h3>
- <p>Class template <code>to_python_indirect</code> converts objects
-of its first argument type to python as extension class instances, using the ownership policy provided by its 2nd argument.
-
- <p>
-
-
- <table border="1" summary="to_python_indirect template parameters">
- <caption>
- <b><code>to_python_indirect</code> Requirements</b><br>
-
- In the table below, <b><code>x</code></b> denotes an object of
- type <code>T</code>, <b><code>h</code></b> denotes an
- object of type
- <code>boost::python::objects::instance_holder*</code>, and
- <b><code>p</code></b> denotes an object of type
- <code>U*</code>.
-
- </caption>
- <tr>
- <th>Parameter
-
- <th>Requirements
-
- <th>Description
-
- <tr>
- <td><code>T</code>
-
- <td>Either <code>U</code>&nbsp;<i>cv</i><code>&amp;</code>
- (where <i>cv</i> is any optional cv-qualification) or a <a
- href="Dereferenceable.html">Dereferenceable</a> type such that
- <code>*x</code> is convertible to <code>U const&amp;</code>, where
- <code>U</code> is a class type.
-
- <td>A type deferencing a C++ class exposed to Python using
- class template <code><a
- href="class.html#class_-spec">class_</a></code>.
-
- <tr>
- <td><code>MakeHolder</code>
-
- <td>h = MakeHolder::execute(p);
-
- <td>A class whose static <code>execute()</code> creates an
- <code>instance_holder</code>.
-
- </table>
-
- Instantiations of <code>to_python_indirect</code> are models of <a
- href="ResultConverter.html#ResultConverter-concept">ResultConverter</a>.
-
-
- <h4><a name="to_python_indirect-spec-synopsis"></a>Class template <code>to_python_indirect</code> synopsis</h4>
-<pre>
-namespace boost { namespace python
-{
- template &lt;class T, class MakeHolder&gt;
- struct to_python_indirect
- {
- static bool convertible();
- PyObject* operator()(T ptr_or_reference) const;
- private:
- static PyTypeObject* type();
- };
-}}
-</pre>
-
- <h4><a name="to_python_indirect-spec-observers"></a>Class template <code>to_python_indirect</code> observers</h4>
-<pre>
-PyObject* operator()(T x) const;
-</pre>
-
- <dl class="function-semantics">
-
- <dt><b>Requires:</b> <code>x</code> refers to an object (if it
- is a pointer type, it is non-null). <code>convertible() ==
- true</code>.
-
- <dt><b>Effects:</b> Creates an appropriately-typed Boost.Python
- extension class instance, uses <code>MakeHolder</code> to create
- an <code>instance_holder</code> from <code>x</code>, installs
- the <code>instance_holder</code> in the new extension class
- instance, and returns a pointer to it.
-
- </dl>
-
-
- <h4><a name="to_python_indirect-spec-statics"></a>Class template <code>to_python_indirect</code> statics</h4>
-<pre>
-bool convertible();
-</pre>
-
- <dt><b>Effects:</b> Returns <code>true</code> iff any module has
- registered a Python type corresponding to <code>U</code>.
-
- <h2><a name="examples"></a>Example</h2>
-
-This example replicates the functionality of <a
-href="reference_existing_object.html#reference_existing_object-spec">reference_existing_object</a>,
-but without some of the compile-time error checking.
-
-
-<pre>
-
-struct make_reference_holder
-{
- typedef boost::python::objects::instance_holder* result_type;
- template &lt;class T&gt;
- static result_type execute(T* p)
- {
- return new boost::python::objects::pointer_holder&lt;T*, T&gt;(p);
- }
-};
-
-struct reference_existing_object
-{
- // metafunction returning the <a href="ResultConverter.html#ResultConverter-concept">ResultConverter</a>
- template &lt;class T&gt;
- struct apply
- {
- typedef boost::python::to_python_indirect&lt;T,make_reference_holder&gt; type;
- };
-};
-</pre>
-
- <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><i>&copy; Copyright <a href="http://www.boost.org/people/dave_abrahams.htm">Dave
- Abrahams</a> 2002. </i> Distributed
- under 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)</p>
-