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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>Boost.Python - <boost/python/manage_new_object.hpp></title>
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<h3><a href="../../../../index.htm"><img height="86" width="277"
alt="C++ Boost" src="../../../../boost.png" border="0"></a></h3>
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<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=
"../../../../people/dave_abrahams.htm">Dave Abrahams</a> 2002.</i></p>
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