<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <!-- Copyright David Abrahams 2006. 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) --> <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/manage_new_object.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/manage_new_object.hpp></h2> </td> </tr> </table> <hr> <h2>Contents</h2> <dl class="page-index"> <dt><a href="#classes">Classes</a></dt> <dd> <dl class="page-index"> <dt><a href="#manage_new_object-spec">Class <code>manage_new_object</code></a></dt> <dd> <dl class="page-index"> <dt><a href="#manage_new_object-spec-synopsis">Class <code>manage_new_object</code> synopsis</a></dt> <dt><a href="#manage_new_object-spec-metafunctions">Class <code>manage_new_object</code> metafunctions</a></dt> </dl> </dd> </dl> </dd> <dt><a href="#examples">Example</a></dt> </dl> <hr> <h2><a name="classes"></a>Classes</h2> <h3><a name="manage_new_object-spec"></a>Class <code>manage_new_object</code></h3> <p><code>manage_new_object</code> is a model of <a href= "ResultConverter.html#ResultConverterGenerator-concept">ResultConverterGenerator</a> which can be used to wrap C++ functions which return a pointer to an object allocated with a <i>new-expression</i>, and expect the caller to take responsibility for deleting that object.</p> <h4><a name="manage_new_object-spec-synopsis"></a>Class <code>manage_new_object</code> synopsis</h4> <pre> namespace boost { namespace python { struct manage_new_object { template <class T> struct apply; }; }} </pre> <h4><a name="manage_new_object-spec-metafunctions"></a>Class <code>manage_new_object</code> metafunctions</h4> <pre> template <class T> struct apply </pre> <dl class="metafunction-semantics"> <dt><b>Requires:</b> <code>T</code> is <code>U*</code> for some <code>U</code>.</dt> <dt><b>Returns:</b> <code>typedef <a href= "to_python_indirect.html#to_python_indirect-spec">to_python_indirect</a><T> type;</code></dt> </dl> <h2><a name="examples"></a>Example</h2> <p>In C++:</p> <pre> #include <boost/python/module.hpp> #include <boost/python/class.hpp> #include <boost/python/manage_new_object.hpp> #include <boost/python/return_value_policy.hpp> struct Foo { Foo(int x) : x(x){} int get_x() { return x; } int x; }; Foo* make_foo(int x) { return new Foo(x); } // Wrapper code using namespace boost::python; BOOST_PYTHON_MODULE(my_module) { def("make_foo", make_foo, return_value_policy<manage_new_object>()) class_<Foo>("Foo") .def("get_x", &Foo::get_x) ; } </pre> In Python: <pre> >>> from my_module import * >>> f = make_foo(3) # create a Foo object >>> f.get_x() 3 </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> <p><i>© Copyright <a href= "http://www.boost.org/people/dave_abrahams.htm">Dave Abrahams</a> 2002.</i></p> </body> </html>