<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>Function any_cast</title> <link rel="stylesheet" href="../boostbook.css" type="text/css"> <meta name="generator" content="DocBook XSL Stylesheets V1.75.2"> <link rel="home" href="../index.html" title="The Boost C++ Libraries BoostBook Documentation Subset"> <link rel="up" href="../any/reference.html#header.boost.any_hpp" title="Header <boost/any.hpp>"> <link rel="prev" href="any.html" title="Class any"> <link rel="next" href="../any/s04.html" title="Acknowledgements"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <table cellpadding="2" width="100%"><tr> <td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../boost.png"></td> <td align="center"><a href="../../../index.html">Home</a></td> <td align="center"><a href="../../../libs/libraries.htm">Libraries</a></td> <td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> <td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> <td align="center"><a href="../../../more/index.htm">More</a></td> </tr></table> <hr> <div class="spirit-nav"> <a accesskey="p" href="any.html"><img src="../../../doc/html/images/prev.png" alt="Prev"></a><a accesskey="u" href="../any/reference.html#header.boost.any_hpp"><img src="../../../doc/html/images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../../../doc/html/images/home.png" alt="Home"></a><a accesskey="n" href="../any/s04.html"><img src="../../../doc/html/images/next.png" alt="Next"></a> </div> <div class="refentry" title="Function any_cast"> <a name="boost.any_cast"></a><div class="titlepage"></div> <div class="refnamediv"> <h2><span class="refentrytitle">Function any_cast</span></h2> <p>boost::any_cast — Custom keyword cast for extracting a value of a given type from an <code class="computeroutput"><a class="link" href="any.html" title="Class any">any</a></code>.</p> </div> <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2> <div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="emphasis"><em>// In header: <<a class="link" href="../any/reference.html#header.boost.any_hpp" title="Header <boost/any.hpp>">boost/any.hpp</a>> </em></span> <span class="bold"><strong>template</strong></span><<span class="bold"><strong>typename</strong></span> T> <span class="type">T</span> any_cast(<a class="link" href="any.html" title="Class any">any</a> & operand); <span class="bold"><strong>template</strong></span><<span class="bold"><strong>typename</strong></span> T> <span class="type">T</span> any_cast(<span class="bold"><strong>const</strong></span> <a class="link" href="any.html" title="Class any">any</a> & operand); <span class="bold"><strong>template</strong></span><<span class="bold"><strong>typename</strong></span> ValueType> <span class="type"><span class="bold"><strong>const</strong></span> ValueType *</span> any_cast(<span class="bold"><strong>const</strong></span> <a class="link" href="any.html" title="Class any">any</a> * operand); <span class="bold"><strong>template</strong></span><<span class="bold"><strong>typename</strong></span> ValueType> <span class="type">ValueType *</span> any_cast(<a class="link" href="any.html" title="Class any">any</a> * operand);</pre></div> <div class="refsect1" title="Description"> <a name="id724794"></a><h2>Description</h2> <div class="variablelist"><table border="0"> <col align="left" valign="top"> <tbody> <tr> <td><p><span class="term">Returns:</span></p></td> <td> If passed a pointer, it returns a similarly qualified pointer to the value content if successful, otherwise null is returned. If T is ValueType, it returns a copy of the held value, otherwise, if T is a reference to (possibly const qualified) ValueType, it returns a reference to the held value.</td> </tr> <tr> <td><p><span class="term">Throws:</span></p></td> <td>Overloads taking an <code class="computeroutput"><a class="link" href="any.html" title="Class any">any</a></code> pointer do not throw; overloads taking an <code class="computeroutput"><a class="link" href="any.html" title="Class any">any</a></code> value or reference throws <code class="computeroutput"><a class="link" href="bad_any_cast.html" title="Class bad_any_cast">bad_any_cast</a></code> if unsuccessful.</td> </tr> </tbody> </table></div> </div> </div> <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> <td align="left"></td> <td align="right"><div class="copyright-footer">Copyright © 2001 Kevlin Henney<p>Distributed under the Boost Software License, Version 1.0. (See accompanying file <code class="filename">LICENSE_1_0.txt</code> or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>) </p> </div></td> </tr></table> <hr> <div class="spirit-nav"> <a accesskey="p" href="any.html"><img src="../../../doc/html/images/prev.png" alt="Prev"></a><a accesskey="u" href="../any/reference.html#header.boost.any_hpp"><img src="../../../doc/html/images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../../../doc/html/images/home.png" alt="Home"></a><a accesskey="n" href="../any/s04.html"><img src="../../../doc/html/images/next.png" alt="Next"></a> </div> </body> </html>