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| 24 | </div> | |
| 25 | <div class="section"> | |
| 26 | <div class="titlepage"><div><div><h4 class="title"> | |
| 27 | <a name="phoenix.modules.object.casts"></a><a class="link" href="casts.html" title="Casts">Casts</a> | |
| 28 | </h4></div></div></div> | |
| 29 | <p> | |
| 30 | <span class="bold"><strong><span class="emphasis"><em>Lazy casts...</em></span></strong></span> | |
| 31 | </p> | |
| 32 | <pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">phoenix</span><span class="special">/</span><span class="identifier">object</span><span class="special">/</span><span class="keyword">static_cast</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> | |
| 33 | <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">phoenix</span><span class="special">/</span><span class="identifier">object</span><span class="special">/</span><span class="keyword">dynamic_cast</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> | |
| 34 | <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">phoenix</span><span class="special">/</span><span class="identifier">object</span><span class="special">/</span><span class="keyword">const_cast</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> | |
| 35 | <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">phoenix</span><span class="special">/</span><span class="identifier">object</span><span class="special">/</span><span class="keyword">reinterpret_cast</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> | |
| 36 | </pre> | |
| 37 | <p> | |
| 38 | The set of lazy C++ cast template functions provide a way of lazily casting | |
| 39 | an object of a certain type to another type. The syntax resembles the well | |
| 40 | known C++ casts. Take note however that the lazy versions have a trailing | |
| 41 | underscore. | |
| 42 | </p> | |
| 43 | <pre class="programlisting"><span class="identifier">static_cast_</span><span class="special"><</span><span class="identifier">T</span><span class="special">>(</span><span class="identifier">lambda_expression</span><span class="special">)</span> | |
| 44 | <span class="identifier">dynamic_cast_</span><span class="special"><</span><span class="identifier">T</span><span class="special">>(</span><span class="identifier">lambda_expression</span><span class="special">)</span> | |
| 45 | <span class="identifier">const_cast_</span><span class="special"><</span><span class="identifier">T</span><span class="special">>(</span><span class="identifier">lambda_expression</span><span class="special">)</span> | |
| 46 | <span class="identifier">reinterpret_cast_</span><span class="special"><</span><span class="identifier">T</span><span class="special">>(</span><span class="identifier">lambda_expression</span><span class="special">)</span> | |
| 47 | </pre> | |
| 48 | <p> | |
| 49 | Example: | |
| 50 | </p> | |
| 51 | <pre class="programlisting"><span class="identifier">static_cast_</span><span class="special"><</span><span class="identifier">Base</span><span class="special">*>(&</span><span class="identifier">arg1</span><span class="special">)</span> | |
| 52 | </pre> | |
| 53 | <p> | |
| 54 | Static-casts the address of <code class="computeroutput"><span class="identifier">arg1</span></code> | |
| 55 | to a <code class="computeroutput"><span class="identifier">Base</span><span class="special">*</span></code>. | |
| 56 | </p> | |
| 57 | </div> | |
| 58 | <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> | |
| 59 | <td align="left"></td> | |
| 60 | <td align="right"><div class="copyright-footer">Copyright © 2002-2005, 2010, 2014, 2015 Joel de Guzman, Dan Marsden, Thomas | |
| 61 | Heller, John Fletcher<p> | |
| 62 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
| 63 | 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>) | |
| 64 | </p> | |
| 65 | </div></td> | |
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