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<div class="titlepage"><div><div><h3 class="title">
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<a name="concepts.objectwrapper.objectwrapper_concept_requiremen"></a><a class="link" href="objectwrapper_concept_requiremen.html" title="ObjectWrapper Concept Requirements">ObjectWrapper
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Concept Requirements</a>
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<p>
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Models of the ObjectWrapper concept have <a class="link" href="../../object_wrappers/boost_python_object_hpp/class_object.html" title="Class object">object</a>
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as a publicly-accessible base class, and are used to supply special construction
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behavior and/or additional convenient functionality through (often templated)
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member functions. Except when the return type R is itself an <a class="link" href="typewrapper_concept_requirements.html" title="TypeWrapper Concept Requirements">TypeWrapper</a>,
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a member function invocation of the form
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</p>
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<pre class="programlisting"><span class="identifier">x</span><span class="special">.</span><span class="identifier">some_function</span><span class="special">(</span><span class="identifier">a1</span><span class="special">,</span> <span class="identifier">a2</span><span class="special">,...</span><span class="identifier">an</span><span class="special">)</span></pre>
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<p>
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always has semantics equivalent to:
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</p>
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<pre class="programlisting"><span class="identifier">extract</span><span class="special"><</span><span class="identifier">R</span><span class="special">>(</span><span class="identifier">x</span><span class="special">.</span><span class="identifier">attr</span><span class="special">(</span><span class="string">"some_function"</span><span class="special">)(</span><span class="identifier">object</span><span class="special">(</span><span class="identifier">a1</span><span class="special">),</span> <span class="identifier">object</span><span class="special">(</span><span class="identifier">a2</span><span class="special">),...</span><span class="identifier">object</span><span class="special">(</span><span class="identifier">an</span><span class="special">)))()</span></pre>
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(see <a class="link" href="caveat.html" title="Caveat">caveat</a> below).
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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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