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| <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="comment">// In header: <<a class="link" href="../any/reference.html#header.boost.any_hpp" title="Header <boost/any.hpp>">boost/any.hpp</a>> |
| |
| </span> |
| <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T<span class="special">></span> <span class="identifier">T</span> <span class="identifier">any_cast</span><span class="special">(</span><a class="link" href="any.html" title="Class any">any</a> <span class="special">&</span> operand<span class="special">)</span><span class="special">;</span> |
| <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T<span class="special">></span> <span class="identifier">T</span> <span class="identifier">any_cast</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="any.html" title="Class any">any</a> <span class="special">&</span> operand<span class="special">)</span><span class="special">;</span> |
| <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> ValueType<span class="special">></span> <span class="keyword">const</span> <span class="identifier">ValueType</span> <span class="special">*</span> <span class="identifier">any_cast</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="any.html" title="Class any">any</a> <span class="special">*</span> operand<span class="special">)</span><span class="special">;</span> |
| <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> ValueType<span class="special">></span> <span class="identifier">ValueType</span> <span class="special">*</span> <span class="identifier">any_cast</span><span class="special">(</span><a class="link" href="any.html" title="Class any">any</a> <span class="special">*</span> operand<span class="special">)</span><span class="special">;</span></pre></div> |
| <div class="refsect1"> |
| <a name="id1029980"></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> |
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| <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> |
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