/Src/Dependencies/Boost/libs/phoenix/doc/html/phoenix/modules/statement/try__catch__statement.html
HTML | 89 lines | 89 code | 0 blank | 0 comment | 0 complexity | ab82af5974effa1958bf94110e41b5bb MD5 | raw file
1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> 4<title>try_ catch_ Statement</title> 5<link rel="stylesheet" href="../../../../../../../doc/src/boostbook.css" type="text/css"> 6<meta name="generator" content="DocBook XSL Stylesheets V1.76.1"> 7<link rel="home" href="../../../index.html" title="Chapter 1. Phoenix 3.0"> 8<link rel="up" href="../statement.html" title="Statement"> 9<link rel="prev" href="for_statement.html" title="for_ Statement"> 10<link rel="next" href="throw_.html" title="throw_"> 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="for_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="throw_.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.statement.try__catch__statement"></a><a class="link" href="try__catch__statement.html" title="try_ catch_ Statement">try_ 28 catch_ Statement</a> 29</h4></div></div></div> 30<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="identifier">try_catch</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 31</pre> 32<p> 33 The syntax is: 34 </p> 35<pre class="programlisting"><span class="identifier">try_</span> 36<span class="special">[</span> 37 <span class="identifier">sequenced_statements</span> 38<span class="special">]</span> 39<span class="special">.</span><span class="identifier">catch_</span><span class="special"><</span><span class="identifier">exception_type</span><span class="special">>()</span> 40<span class="special">[</span> 41 <span class="identifier">sequenced_statements</span> 42<span class="special">]</span> 43<span class="special">...</span> 44<span class="special">.</span><span class="identifier">catch_all</span> 45<span class="special">[</span> 46 <span class="identifier">sequenced_statement</span> 47<span class="special">]</span> 48</pre> 49<p> 50 Note the usual underscore after try and catch, and the extra parentheses 51 required after the catch. 52 </p> 53<p> 54 Example: The following code calls the (lazy) function <code class="computeroutput"><span class="identifier">f</span></code> 55 for each element, and prints messages about different exception types it 56 catches. 57 </p> 58<pre class="programlisting"><span class="identifier">try_</span> 59<span class="special">[</span> 60 <span class="identifier">f</span><span class="special">(</span><span class="identifier">arg1</span><span class="special">)</span> 61<span class="special">]</span> 62<span class="special">.</span><span class="identifier">catch_</span><span class="special"><</span><span class="identifier">runtime_error</span><span class="special">>()</span> 63<span class="special">[</span> 64 <span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">val</span><span class="special">(</span><span class="string">"caught runtime error or derived\n"</span><span class="special">)</span> 65<span class="special">]</span> 66<span class="special">.</span><span class="identifier">catch_</span><span class="special"><</span><span class="identifier">exception</span><span class="special">>()</span> 67<span class="special">[</span> 68 <span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">val</span><span class="special">(</span><span class="string">"caught exception or derived\n"</span><span class="special">)</span> 69<span class="special">]</span> 70<span class="special">.</span><span class="identifier">catch_all</span> 71<span class="special">[</span> 72 <span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">val</span><span class="special">(</span><span class="string">"caught some other type of exception\n"</span><span class="special">)</span> 73<span class="special">]</span> 74</pre> 75</div> 76<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 77<td align="left"></td> 78<td align="right"><div class="copyright-footer">Copyright © 2002-2005, 2010 Joel de Guzman, Dan Marsden, Thomas Heller<p> 79 Distributed under the Boost Software License, Version 1.0. (See accompanying 80 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>) 81 </p> 82</div></td> 83</tr></table> 84<hr> 85<div class="spirit-nav"> 86<a accesskey="p" href="for_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="throw_.html"><img src="../../../../../../../doc/src/images/next.png" alt="Next"></a> 87</div> 88</body> 89</html>