boost-react-native-bundle

<!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 - <boost/python/default_call_policies.hpp></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 <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  11 June, 2007  <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>