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86 lines
2.9 KiB
HTML
86 lines
2.9 KiB
HTML
<!-- Copyright David Abrahams 2006. Distributed under the Boost -->
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<!-- Software License, Version 1.0. (See accompanying -->
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<!-- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) -->
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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<link rel="stylesheet" type="text/css" href="../boost.css">
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<title>Boost.Python - <call.hpp></title>
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</head>
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<body link="#0000ff" vlink="#800080">
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<table border="0" cellpadding="7" cellspacing="0" width="100%" summary=
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"header">
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<tr>
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<td valign="top" width="300">
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<h3><a href="../../../../index.htm"><img height="86" width="277" alt=
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"C++ Boost" src="../../../../boost.png" border="0"></a></h3>
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</td>
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<td valign="top">
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<h1 align="center"><a href="../index.html">Boost.Python</a></h1>
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<h2 align="center">Header <call.hpp></h2>
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</td>
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</tr>
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</table>
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<hr>
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<h2>Contents</h2>
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<dl class="page-index">
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<dt><a href="#introduction">Introduction</a></dt>
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<dt><a href="#functions">Functions</a></dt>
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<dl class="page-index">
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<dt><a href="#call-spec">call</a></dt>
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</dl>
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<dt><a href="#examples">Example(s)</a></dt>
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</dl>
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<hr>
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<h2><a name="introduction"></a>Introduction</h2>
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<p>
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<code><boost/python/call.hpp></code> defines the <a
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href="#call-spec"><code>call</code></a> family of overloaded function
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templates, used to invoke Python callable objects from C++.
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<h2><a name="functions"></a>Functions</h2>
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<pre>
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<a name="call-spec">template <class R, class A1, class A2, ... class A<i>n</i>></a>
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R call(PyObject* callable, A1 const&, A2 const&, ... A<i>n</i> const&)
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</pre>
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<dl class="function-semantics">
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<dt><b>Requires:</b> <code>R</code> is a pointer type, reference
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type, or a complete type with an accessible copy constructor</dt>
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<dt><b>Effects:</b> Invokes <code>callable(a1, a2, ...a<i>n</i>)</code> in
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Python, where <code>a1</code>...<code>a<i>n</i></code> are the arguments to
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<code>call()</code>, converted to Python objects.
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<dt><b>Returns:</b> The result of the Python call, converted to the C++ type <code>R</code>.</dt>
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</dt>
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<dt><b>Rationale:</b> For a complete semantic description and
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rationale, see <a href="callbacks.html">this page</a>.
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</dt>
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</dl>
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<h2><a name="examples"></a>Example(s)</h2>
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The following C++ function applies a Python callable object to its two
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arguments and returns the result. If a Python exception is raised or
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the result can't be converted to a <code>double</code>, an exception
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is thrown.
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<pre>
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double apply2(PyObject* func, double x, double y)
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{
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return boost::python::call<double>(func, x, y);
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}
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</pre>
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<p>Revised
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<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
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9 May, 2002 <!-- Luann's birthday! -->
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<!--webbot bot="Timestamp" endspan i-checksum="39359" -->
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</p>
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<p><i>© Copyright <a href="http://www.boost.org/people/dave_abrahams.htm">Dave Abrahams</a>
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2002. </i></p>
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</body>
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</html>
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