1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>Casts</title> 5<link rel="stylesheet" href="../../../../../../../doc/src/boostbook.css" type="text/css"> 6<meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> 7<link rel="home" href="../../../index.html" title="Chapter 1. Phoenix 3.2.0"> 8<link rel="up" href="../object.html" title="Object"> 9<link rel="prev" href="delete.html" title="Delete"> 10<link rel="next" href="../scope.html" title="Scope"> 11</head> 12<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 13<table cellpadding="2" width="100%"><tr> 14<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../../boost.png"></td> 15<td align="center"><a href="../../../../../../../index.html">Home</a></td> 16<td align="center"><a href="../../../../../../../libs/libraries.htm">Libraries</a></td> 17<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> 18<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> 19<td align="center"><a href="../../../../../../../more/index.htm">More</a></td> 20</tr></table> 21<hr> 22<div class="spirit-nav"> 23<a accesskey="p" href="delete.html"><img src="../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../object.html"><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="../scope.html"><img src="../../../../../../../doc/src/images/next.png" alt="Next"></a> 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> 66</tr></table> 67<hr> 68<div class="spirit-nav"> 69<a accesskey="p" href="delete.html"><img src="../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../object.html"><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="../scope.html"><img src="../../../../../../../doc/src/images/next.png" alt="Next"></a> 70</div> 71</body> 72</html> 73
