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| 23 | <a accesskey="p" href="try__catch__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="../object.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.throw_"></a><a class="link" href="throw_.html" title="throw_">throw_</a> | |
| 28 | </h4></div></div></div> | |
| 29 | <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> | |
| 30 | </pre> | |
| 31 | <p> | |
| 32 | As a natural companion to the try/catch support, the statement module provides | |
| 33 | lazy throwing and re-throwing of exceptions. | |
| 34 | </p> | |
| 35 | <p> | |
| 36 | The syntax to throw an exception is: | |
| 37 | </p> | |
| 38 | <pre class="programlisting"><span class="identifier">throw_</span><span class="special">(</span><span class="identifier">exception_expression</span><span class="special">)</span> | |
| 39 | </pre> | |
| 40 | <p> | |
| 41 | The syntax to re-throw an exception is: | |
| 42 | </p> | |
| 43 | <pre class="programlisting"><span class="identifier">throw_</span><span class="special">()</span> | |
| 44 | </pre> | |
| 45 | <p> | |
| 46 | Example: This code extends the try/catch example, re-throwing exceptions | |
| 47 | derived from runtime_error or exception, and translating other exception | |
| 48 | types to runtime_errors. | |
| 49 | </p> | |
| 50 | <pre class="programlisting"><span class="identifier">try_</span> | |
| 51 | <span class="special">[</span> | |
| 52 | <span class="identifier">f</span><span class="special">(</span><span class="identifier">arg1</span><span class="special">)</span> | |
| 53 | <span class="special">]</span> | |
| 54 | <span class="special">.</span><span class="identifier">catch_</span><span class="special"><</span><span class="identifier">runtime_error</span><span class="special">>()</span> | |
| 55 | <span class="special">[</span> | |
| 56 | <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> | |
| 57 | <span class="identifier">throw_</span><span class="special">()</span> | |
| 58 | <span class="special">]</span> | |
| 59 | <span class="special">.</span><span class="identifier">catch_</span><span class="special"><</span><span class="identifier">exception</span><span class="special">>()</span> | |
| 60 | <span class="special">[</span> | |
| 61 | <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> | |
| 62 | <span class="identifier">throw_</span><span class="special">()</span> | |
| 63 | <span class="special">]</span> | |
| 64 | <span class="special">.</span><span class="identifier">catch_all</span> | |
| 65 | <span class="special">[</span> | |
| 66 | <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> | |
| 67 | <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> | |
| 68 | <span class="special">]</span> | |
| 69 | </pre> | |
| 70 | </div> | |
| 71 | <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> | |
| 72 | <td align="left"></td> | |
| 73 | <td align="right"><div class="copyright-footer">Copyright © 2002-2005, 2010, 2014, 2015 Joel de Guzman, Dan Marsden, Thomas | |
| 74 | Heller, John Fletcher<p> | |
| 75 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
| 76 | 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>) | |
| 77 | </p> | |
| 78 | </div></td> | |
| 79 | </tr></table> | |
| 80 | <hr> | |
| 81 | <div class="spirit-nav"> | |
| 82 | <a accesskey="p" href="try__catch__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="../object.html"><img src="../../../../../../../doc/src/images/next.png" alt="Next"></a> | |
| 83 | </div> | |
| 84 | </body> | |
| 85 | </html> |