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| <a name="python.exception"></a> Exception Translation</h2></div></div></div> |
| <p> |
| All C++ exceptions must be caught at the boundary with Python code. This boundary |
| is the point where C++ meets Python. Boost.Python provides a default exception |
| handler that translates selected standard exceptions, then gives up: |
| </p> |
| <pre class="programlisting"><span class="keyword">raise</span> <span class="identifier">RuntimeError</span><span class="special">,</span> <span class="string">'unidentifiable C++ Exception'</span> |
| </pre> |
| <p> |
| Users may provide custom translation. Here's an example: |
| </p> |
| <pre class="programlisting"><span class="identifier">struct</span> <span class="identifier">PodBayDoorException</span><span class="special">;</span> |
| <span class="identifier">void</span> <span class="identifier">translator</span><span class="special">(</span><span class="identifier">PodBayDoorException</span> <span class="identifier">const</span><span class="special">&</span> <span class="identifier">x</span><span class="special">)</span> <span class="special">{</span> |
| <span class="identifier">PyErr_SetString</span><span class="special">(</span><span class="identifier">PyExc_UserWarning</span><span class="special">,</span> <span class="string">"I'm sorry Dave..."</span><span class="special">);</span> |
| <span class="special">}</span> |
| <span class="identifier">BOOST_PYTHON_MODULE</span><span class="special">(</span><span class="identifier">kubrick</span><span class="special">)</span> <span class="special">{</span> |
| <span class="identifier">register_exception_translator</span><span class="special"><</span> |
| <span class="identifier">PodBayDoorException</span><span class="special">>(</span><span class="identifier">translator</span><span class="special">);</span> |
| <span class="special">...</span> |
| </pre> |
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| <td align="right"><div class="copyright-footer">Copyright © 2002-2005 Joel |
| de Guzman, David Abrahams<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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