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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
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<a name="tutorial.exception"></a><a class="link" href="exception.html" title="Exception Translation">Exception Translation</a>
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</h2></div></div></div>
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<p>
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All C++ exceptions must be caught at the boundary with Python code. This boundary
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is the point where C++ meets Python. Boost.Python provides a default exception
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handler that translates selected standard exceptions, then gives up:
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</p>
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<pre class="programlisting"><span class="keyword">raise</span> <span class="identifier">RuntimeError</span><span class="special">,</span> <span class="string">'unidentifiable C++ Exception'</span>
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</pre>
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<p>
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Users may provide custom translation. Here's an example:
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</p>
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<pre class="programlisting"><span class="identifier">struct</span> <span class="identifier">PodBayDoorException</span><span class="special">;</span>
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<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>
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<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>
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<span class="special">}</span>
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<span class="identifier">BOOST_PYTHON_MODULE</span><span class="special">(</span><span class="identifier">kubrick</span><span class="special">)</span> <span class="special">{</span>
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<span class="identifier">register_exception_translator</span><span class="special"><</span>
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<span class="identifier">PodBayDoorException</span><span class="special">>(</span><span class="identifier">translator</span><span class="special">);</span>
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<span class="special">...</span>
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</pre>
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<td align="right"><div class="copyright-footer">Copyright © 2002-2005 Joel
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de Guzman, David Abrahams<p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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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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