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<title>Boost.Python -
<boost/python/default_call_policies.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>
<td valign="top">
<h1 align="center"><a href="../index.html">Boost.Python</a></h1>
<h2 align="center">Header
<boost/python/default_call_policies.hpp></h2>
</table>
<hr>
<h2>Contents</h2>
<dl class="page-index">
<dt><a href="#classes">Classes</a>
<dd>
<dl class="page-index">
<dt><a href="#default_call_policies-spec">Class
<code>default_call_policies</code></a>
<dd>
<dl class="page-index">
<dt><a href="#default_call_policies-spec-synopsis">Class
<code>default_call_policies</code> synopsis</a>
<dt><a href="#default_call_policies-spec-statics">Class
<code>default_call_policies</code> static functions</a>
</dl>
<dt><a href="#default_result_converter-spec">Class
<code>default_result_converter</code></a>
<dd>
<dl class="page-index">
<dt><a href="#default_result_converter-spec-synopsis">Class
<code>default_result_converter</code> synopsis</a>
<dt><a href="#default_result_converter-spec-metafunctions">Class
<code>default_result_converter</code> metafunctions</a>
</dl>
</dl>
<dt><a href="#examples">Example</a>
</dl>
<hr>
<h2><a name="classes"></a>Classes</h2>
<h3><a name="default_call_policies-spec"></a>Class
<code>default_call_policies</code></h3>
<p><code>default_call_policies</code> is a model of <a href=
"CallPolicies.html">CallPolicies</a> with no <code>precall</code> or
<code>postcall</code> behavior and a <code>result_converter</code> which
handles by-value returns. Wrapped C++ functions and member functions use
<code>default_call_policies</code> unless otherwise specified. You may find
it convenient to derive new models of <a href=
"CallPolicies.html">CallPolicies</a> from
<code>default_call_policies</code>.
<h4><a name="default_call_policies-spec-synopsis"></a>Class
<code>default_call_policies</code> synopsis</h4>
<pre>
namespace boost { namespace python
{
struct default_call_policies
{
static bool precall(PyObject*);
static PyObject* postcall(PyObject*, PyObject* result);
typedef <a href=
"#default_result_converter-spec">default_result_converter</a> result_converter;
template <class Sig> struct extract_return_type : mpl::front<Sig>{};
};
}}
</pre>
<h4><a name="default_call_policies-spec-statics"></a>Class
<code>default_call_policies</code> static functions</h4>
<pre>
bool precall(PyObject*);
</pre>
<dl class="function-semantics">
<dt><b>Returns:</b> <code>true</code>
<dt><b>Throws:</b> nothing
</dl>
<pre>
PyObject* postcall(PyObject*, PyObject* result);
</pre>
<dl class="function-semantics">
<dt><b>Returns:</b> <code>result</code>
<dt><b>Throws:</b> nothing
</dl>
<h3><a name="default_result_converter-spec"></a>Class
<code>default_result_converter</code></h3>
<p><code>default_result_converter</code> is a model of <a href=
"ResultConverter.html#ResultConverterGenerator-concept">ResultConverterGenerator</a> which can be
used to wrap C++ functions returning non-pointer types, <code>char
const*</code>, and <code>PyObject*</code>, by-value.
<h4><a name="default_result_converter-spec-synopsis"></a>Class
<code>default_result_converter</code> synopsis</h4>
<pre>
namespace boost { namespace python
{
struct default_result_converter
{
template <class T> struct apply;
};
}}
</pre>
<h4><a name="default_result_converter-spec-metafunctions"></a>Class
<code>default_result_converter</code> metafunctions</h4>
<pre>
template <class T> struct apply
</pre>
<dl class="metafunction-semantics">
<dt><b>Requires:</b> <code>T</code> is not a reference type. If
<code>T</code> is a pointer type, <code>T</code> is <code>const
char*</code> or <code>PyObject*</code>.
<dt><b>Returns:</b> <code>typedef <a href=
"to_python_value.html#to_python_value-spec">to_python_value</a><T
const&> type;</code>
</dl>
<h2><a name="examples"></a>Example</h2>
<p>This example comes from the Boost.Python implementation itself. Because
the <a href=
"return_value_policy.html#return_value_policy-spec">return_value_policy</a>
class template does not implement <code>precall</code> or
<code>postcall</code> behavior, its default base class is
<code>default_call_policies</code>:
<pre>
template <class Handler, class Base = default_call_policies>
struct return_value_policy : Base
{
typedef Handler result_converter;
};
</pre>
<p>Revised
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
11 June, 2007
<!--webbot bot="Timestamp" endspan i-checksum="39359" -->
<p><i>© 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>
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