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| <div class="titlepage"><div><div><h4 class="title"> |
| <a name="phoenix.modules.statement.try__catch__statement"></a><a class="link" href="try__catch__statement.html" title="try_ catch_ Statement">try_ |
| catch_ Statement</a> |
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| <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> |
| </pre> |
| <p> |
| The syntax is: |
| </p> |
| <pre class="programlisting"><span class="identifier">try_</span> |
| <span class="special">[</span> |
| <span class="identifier">sequenced_statements</span> |
| <span class="special">]</span> |
| <span class="special">.</span><span class="identifier">catch_</span><span class="special"><</span><span class="identifier">exception_type</span><span class="special">>()</span> |
| <span class="special">[</span> |
| <span class="identifier">sequenced_statements</span> |
| <span class="special">]</span> |
| <span class="special">...</span> |
| <span class="special">.</span><span class="identifier">catch_all</span> |
| <span class="special">[</span> |
| <span class="identifier">sequenced_statement</span> |
| <span class="special">]</span> |
| </pre> |
| <p> |
| Note the usual underscore after try and catch, and the extra parentheses |
| required after the catch. |
| </p> |
| <p> |
| Example: The following code calls the (lazy) function <code class="computeroutput"><span class="identifier">f</span></code> |
| for each element, and prints messages about different exception types it |
| catches. |
| </p> |
| <pre class="programlisting"><span class="identifier">try_</span> |
| <span class="special">[</span> |
| <span class="identifier">f</span><span class="special">(</span><span class="identifier">arg1</span><span class="special">)</span> |
| <span class="special">]</span> |
| <span class="special">.</span><span class="identifier">catch_</span><span class="special"><</span><span class="identifier">runtime_error</span><span class="special">>()</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">"caught runtime error or derived\n"</span><span class="special">)</span> |
| <span class="special">]</span> |
| <span class="special">.</span><span class="identifier">catch_</span><span class="special"><</span><span class="identifier">exception</span><span class="special">>()</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">"caught exception or derived\n"</span><span class="special">)</span> |
| <span class="special">]</span> |
| <span class="special">.</span><span class="identifier">catch_all</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">"caught some other type of exception\n"</span><span class="special">)</span> |
| <span class="special">]</span> |
| </pre> |
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| <td align="right"><div class="copyright-footer">Copyright © 2002-2005, 2010 Joel de Guzman, Dan Marsden, Thomas Heller<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>) |
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