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| <div class="titlepage"><div><div><h4 class="title"> |
| <a name="phoenix.modules.statement.throw_"></a><a class="link" href="throw_.html" title="throw_">throw_</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">throw</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> |
| </pre> |
| <p> |
| As a natural companion to the try/catch support, the statement module provides |
| lazy throwing and re-throwing of exceptions. |
| </p> |
| <p> |
| The syntax to throw an exception is: |
| </p> |
| <pre class="programlisting"><span class="identifier">throw_</span><span class="special">(</span><span class="identifier">exception_expression</span><span class="special">)</span> |
| </pre> |
| <p> |
| The syntax to re-throw an exception is: |
| </p> |
| <pre class="programlisting"><span class="identifier">throw_</span><span class="special">()</span> |
| </pre> |
| <p> |
| Example: This code extends the try/catch example, re-throwing exceptions |
| derived from runtime_error or exception, and translating other exception |
| types to runtime_errors. |
| </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="identifier">throw_</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="identifier">throw_</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="identifier">throw_</span><span class="special">(</span><span class="identifier">runtime_error</span><span class="special">(</span><span class="string">"translated exception"</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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