| <html> |
| <head> |
| <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> |
| <title>switch_ Statement</title> |
| <link rel="stylesheet" href="../../../../../../../doc/src/boostbook.css" type="text/css"> |
| <meta name="generator" content="DocBook XSL Stylesheets V1.78.1"> |
| <link rel="home" href="../../../index.html" title="Chapter 1. Phoenix 3.2.0"> |
| <link rel="up" href="../statement.html" title="Statement"> |
| <link rel="prev" href="___if_else_____statement.html" title="if_else_ Statement"> |
| <link rel="next" href="while__statement.html" title="while_ Statement"> |
| </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="___if_else_____statement.html"><img src="../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../statement.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="while__statement.html"><img src="../../../../../../../doc/src/images/next.png" alt="Next"></a> |
| </div> |
| <div class="section"> |
| <div class="titlepage"><div><div><h4 class="title"> |
| <a name="phoenix.modules.statement.switch__statement"></a><a class="link" href="switch__statement.html" title="switch_ Statement">switch_ |
| Statement</a> |
| </h4></div></div></div> |
| <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">statement</span><span class="special">/</span><span class="keyword">switch</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> |
| </pre> |
| <p> |
| The syntax is: |
| </p> |
| <pre class="programlisting"><span class="identifier">switch_</span><span class="special">(</span><span class="identifier">integral_expression</span><span class="special">)</span> |
| <span class="special">[</span> |
| <span class="identifier">case_</span><span class="special"><</span><span class="identifier">integral_value</span><span class="special">>(</span><span class="identifier">sequenced_statements</span><span class="special">),</span> |
| <span class="special">...</span> |
| <span class="identifier">default_</span><span class="special"><</span><span class="identifier">integral_value</span><span class="special">>(</span><span class="identifier">sequenced_statements</span><span class="special">)</span> |
| <span class="special">]</span> |
| </pre> |
| <p> |
| A comma separated list of cases, and an optional default can be provided. |
| Note unlike a normal switch statement, cases do not fall through. |
| </p> |
| <p> |
| Example: This code prints out <code class="computeroutput"><span class="string">"one"</span></code>, |
| <code class="computeroutput"><span class="string">"two"</span></code> or <code class="computeroutput"><span class="string">"other value"</span></code> depending on the |
| element's actual value: |
| </p> |
| <pre class="programlisting"><span class="identifier">std</span><span class="special">::</span><span class="identifier">for_each</span><span class="special">(</span><span class="identifier">c</span><span class="special">.</span><span class="identifier">begin</span><span class="special">(),</span> <span class="identifier">c</span><span class="special">.</span><span class="identifier">end</span><span class="special">(),</span> |
| <span class="identifier">switch_</span><span class="special">(</span><span class="identifier">arg1</span><span class="special">)</span> |
| <span class="special">[</span> |
| <span class="identifier">case_</span><span class="special"><</span><span class="number">1</span><span class="special">>(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">val</span><span class="special">(</span><span class="string">"one"</span><span class="special">)</span> <span class="special"><<</span> <span class="char">'\n'</span><span class="special">),</span> |
| <span class="identifier">case_</span><span class="special"><</span><span class="number">2</span><span class="special">>(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">val</span><span class="special">(</span><span class="string">"two"</span><span class="special">)</span> <span class="special"><<</span> <span class="char">'\n'</span><span class="special">),</span> |
| <span class="identifier">default_</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">val</span><span class="special">(</span><span class="string">"other value"</span><span class="special">)</span> <span class="special"><<</span> <span class="char">'\n'</span><span class="special">)</span> |
| <span class="special">]</span> |
| <span class="special">);</span> |
| </pre> |
| </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 © 2002-2005, 2010, 2014, 2015 Joel de Guzman, Dan Marsden, Thomas |
| Heller, John Fletcher<p> |
| Distributed under the Boost Software License, Version 1.0. (See accompanying |
| 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>) |
| </p> |
| </div></td> |
| </tr></table> |
| <hr> |
| <div class="spirit-nav"> |
| <a accesskey="p" href="___if_else_____statement.html"><img src="../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../statement.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="while__statement.html"><img src="../../../../../../../doc/src/images/next.png" alt="Next"></a> |
| </div> |
| </body> |
| </html> |
