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Library/boost/libs/python/doc/html/reference/concepts/extractor.html
135 строк
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PatoFlamejanteTV
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19 дек 2024, 19:11
19 дек 2024, 19:11
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<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Extractor</title> <link rel="stylesheet" href="../../boostbook.css" type="text/css"> <meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> <link rel="home" href="../index.html" title="Boost.Python Reference Manual"> <link rel="up" href="../concepts.html" title="Chapter 1. Concepts"> <link rel="prev" href="dereferenceable.html" title="Dereferenceable"> <link rel="next" href="holdergenerator.html" title="HolderGenerator"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <table cellpadding="2" width="100%"><tr><td valign="top"><img alt="" width="" height="" src="../../images/boost.png"></td></tr></table> <hr> <div class="spirit-nav"> <a accesskey="p" href="dereferenceable.html"><img src="../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../concepts.html"><img src="../../images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="holdergenerator.html"><img src="../../images/next.png" alt="Next"></a> </div> <div class="section"> <div class="titlepage"><div><div><h2 class="title" style="clear: both"> <a name="concepts.extractor"></a><a class="link" href="extractor.html" title="Extractor">Extractor</a> </h2></div></div></div> <div class="toc"><dl class="toc"> <dt><span class="section"><a href="extractor.html#concepts.extractor.introduction">Introduction</a></span></dt> <dt><span class="section"><a href="extractor.html#concepts.extractor.concept_requirements">Concept Requirements</a></span></dt> <dt><span class="section"><a href="extractor.html#concepts.extractor.notes">Notes</a></span></dt> </dl></div> <div class="section"> <div class="titlepage"><div><div><h3 class="title"> <a name="concepts.extractor.introduction"></a><a class="link" href="extractor.html#concepts.extractor.introduction" title="Introduction">Introduction</a> </h3></div></div></div> <p> An Extractor is a class which Boost.Python can use to extract C++ objects from Python objects, and is typically used by facilities that define <code class="computeroutput"><span class="identifier">from_python</span></code> conversions for "traditional" Python extension types. </p> </div> <div class="section"> <div class="titlepage"><div><div><h3 class="title"> <a name="concepts.extractor.concept_requirements"></a><a class="link" href="extractor.html#concepts.extractor.concept_requirements" title="Concept Requirements">Concept Requirements</a> </h3></div></div></div> <p> In the table below, <code class="computeroutput"><span class="identifier">X</span></code> denotes a model of <code class="computeroutput"><span class="identifier">Extractor</span></code> and <code class="computeroutput"><span class="identifier">a</span></code> denotes an instance of a Python object type. </p> <div class="informaltable"><table class="table"> <colgroup> <col> <col> <col> </colgroup> <thead><tr> <th> <p> Expression </p> </th> <th> <p> Type </p> </th> <th> <p> Semantics </p> </th> </tr></thead> <tbody> <tr> <td> <p> <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> </p> </td> <td> <p> non-void </p> </td> <td> <p> Returns the C++ object being extracted. The execute function must not be overloaded. </p> </td> </tr> <tr> <td> <p> <code class="computeroutput"><span class="special">&</span><span class="identifier">a</span><span class="special">.</span><span class="identifier">ob_type</span></code> </p> </td> <td> <p> <code class="computeroutput"><span class="identifier">PyTypeObject</span><span class="special">**</span></code> </p> </td> <td> <p> Points to the <code class="computeroutput"><span class="identifier">ob_type</span></code> field of an object which is layout-compatible with <code class="computeroutput"><span class="identifier">PyObject</span></code> </p> </td> </tr> </tbody> </table></div> </div> <div class="section"> <div class="titlepage"><div><div><h3 class="title"> <a name="concepts.extractor.notes"></a><a class="link" href="extractor.html#concepts.extractor.notes" title="Notes">Notes</a> </h3></div></div></div> <p> Informally, an Extractor's execute member must be a non-overloaded static function whose single argument is a Python object type. Acceptable Python object types include those publicly (and unambiguously) derived from PyObject, and POD types which are layout-compatible with PyObject. </p> </div> </div> <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> <td align="left"></td> <td align="right"><div class="copyright-footer">Copyright © 2002-2005, 2015 David Abrahams, Stefan Seefeld<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> </p> </div></td> </tr></table> <hr> <div class="spirit-nav"> <a accesskey="p" href="dereferenceable.html"><img src="../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../concepts.html"><img src="../../images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../../images/home.png" alt="Home"></a><a accesskey="n" href="holdergenerator.html"><img src="../../images/next.png" alt="Next"></a> </div> </body> </html>