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26<div class="refentry"> 27<a name="boost.xpressive.op.dynamic_cast_"></a><div class="titlepage"></div> 28<div class="refnamediv"> 29<h2><span class="refentrytitle">Struct template dynamic_cast_</span></h2> 30<p>boost::xpressive::op::dynamic_cast_ — <code class="computeroutput"><a class="link" href="dynamic_cast_.html" title="Struct template dynamic_cast_">dynamic_cast_</a><></code> is a PolymorphicFunctionObject for dynamically casting a parameter to a different type. </p> 31</div> 32<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2> 33<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="../../../xpressive/reference.html#header.boost.xpressive.xpressive_fwd_hpp" title="Header <boost/xpressive/xpressive_fwd.hpp>">boost/xpressive/xpressive_fwd.hpp</a>> 34 35</span><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T<span class="special">></span> 36<span class="keyword">struct</span> <a class="link" href="dynamic_cast_.html" title="Struct template dynamic_cast_">dynamic_cast_</a> <span class="special">{</span> 37 38 <span class="comment">// <a class="link" href="dynamic_cast_.html#id-1_3_47_5_18_2_1_18_4_4-bb">public member functions</a></span> 39 <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Value<span class="special">></span> <span class="identifier">T</span> <a class="link" href="dynamic_cast_.html#id-1_3_47_5_18_2_1_18_4_4_1-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="identifier">Value</span> <span class="keyword">const</span> <span class="special">&</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span> 40<span class="special">}</span><span class="special">;</span></pre></div> 41<div class="refsect1"> 42<a name="id-1.3.47.5.19.8.4"></a><h2>Description</h2> 43<p> 44</p> 45<div class="refsect2"> 46<a name="id-1.3.47.5.19.8.4.3"></a><h3>Template Parameters</h3> 47<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"> 48<pre class="literallayout"><span class="keyword">typename</span> T</pre> 49<p>The type to which to dynamically cast the parameter. </p> 50</li></ol></div> 51</div> 52<div class="refsect2"> 53<a name="id-1.3.47.5.19.8.4.4"></a><h3> 54<a name="id-1_3_47_5_18_2_1_18_4_4-bb"></a><code class="computeroutput">dynamic_cast_</code> public member functions</h3> 55<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"> 56<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Value<span class="special">></span> <span class="identifier">T</span> <a name="id-1_3_47_5_18_2_1_18_4_4_1-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="identifier">Value</span> <span class="keyword">const</span> <span class="special">&</span> val<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre> 57<p> 58 59</p> 60<div class="variablelist"><table border="0" class="variablelist compact"> 61<colgroup> 62<col align="left" valign="top"> 63<col> 64</colgroup> 65<tbody> 66<tr> 67<td><p><span class="term">Parameters:</span></p></td> 68<td><div class="variablelist"><table border="0" class="variablelist compact"> 69<colgroup> 70<col align="left" valign="top"> 71<col> 72</colgroup> 73<tbody><tr> 74<td><p><span class="term"><code class="computeroutput">val</code></span></p></td> 75<td><p>The value to dynamically cast. </p></td> 76</tr></tbody> 77</table></div></td> 78</tr> 79<tr> 80<td><p><span class="term">Returns:</span></p></td> 81<td><p><code class="computeroutput">dynamic_cast<T>(val)</code> </p></td> 82</tr> 83</tbody> 84</table></div> 85</li></ol></div> 86</div> 87</div> 88</div> 89<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 90<td align="left"></td> 91<td align="right"><div class="copyright-footer">Copyright © 2007 Eric Niebler<p> 92 Distributed under the Boost Software License, Version 1.0. (See accompanying 93 file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>) 94 </p> 95</div></td> 96</tr></table> 97<hr> 98<div class="spirit-nav"> 99<a accesskey="p" href="construct.html"><img src="../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../../xpressive/reference.html#header.boost.xpressive.xpressive_fwd_hpp"><img src="../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="static_cast_.html"><img src="../../../../../doc/src/images/next.png" alt="Next"></a> 100</div> 101</body> 102</html> 103
