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<div class="titlepage"><div><div><h3 class="title">
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<a name="concepts.extractor.concept_requirements"></a><a class="link" href="concept_requirements.html" title="Concept Requirements">Concept Requirements</a>
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</h3></div></div></div>
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<p>
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In the table below, <code class="computeroutput"><span class="identifier">X</span></code> denotes
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a model of <code class="computeroutput"><span class="identifier">Extractor</span></code> and
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<code class="computeroutput"><span class="identifier">a</span></code> denotes an instance of
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a Python object type.
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<div class="informaltable"><table class="table">
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<thead><tr>
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<th>
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<p>
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Expression
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</p>
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</th>
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<th>
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<p>
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Type
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</p>
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</th>
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<th>
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<p>
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Semantics
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<tbody>
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<tr>
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<code class="computeroutput"><span class="identifier">X</span><span class="special">::</span><span class="identifier">execute</span><span class="special">(</span><span class="identifier">a</span><span class="special">)</span></code>
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</p>
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</td>
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<td>
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<p>
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non-void
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</p>
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</td>
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<td>
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<p>
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Returns the C++ object being extracted. The execute function
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must not be overloaded.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="special">&</span><span class="identifier">a</span><span class="special">.</span><span class="identifier">ob_type</span></code>
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</p>
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</td>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">PyTypeObject</span><span class="special">**</span></code>
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</p>
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</td>
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<td>
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<p>
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Points to the <code class="computeroutput"><span class="identifier">ob_type</span></code>
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field of an object which is layout-compatible with <code class="computeroutput"><span class="identifier">PyObject</span></code>
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<td align="right"><div class="copyright-footer">Copyright © 2002-2005, 2015 David Abrahams, Stefan Seefeld<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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