<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <link rel="stylesheet" type="text/css" href=../../../../boost.css> <title>Boost.Python - Holder Concept</title> </head> <body link="#0000ff" vlink="#800080"> <table border="0" cellpadding="7" cellspacing="0" width="100%" summary= "header"> <tr> <td valign="top" width="300"> <h3><a href="../../../../index.htm"><img height="86" width="277" alt="C++ Boost" src="../../../../c++boost.gif" border="0"></a></h3> </td> <td valign="top"> <h1 align="center"><a href="../index.html">Boost.Python</a></h1> <h2 align="center">HolderGenerator Concept</h2> </td> </tr> </table> <hr> <dl class="page-index"> <dt><a href="#introduction">Introduction</a></dt> <dt><a href="#concept-requirements">Concept Requirements</a></dt> <dl class="page-index"> <dt><a href="#HolderGenerator-concept">HolderGenerator Concept</a></dt> </dl> </dl> <h2><a name="introduction"></a>Introduction</h2> <p>A HolderGenerator is a unary metafunction class which returns types suitable for holding instances of its argument in a wrapped C++ class instance. <h2><a name="concept-requirements"></a>Concept Requirements</h2> <h3><a name="HolderGenerator-concept"></a>HolderGenerator Concept</h3> <p>In the table below, <code><b>G</b></code> denotes an type which models HolderGenerator, and <code><b>X</b></code> denotes a class type. <table summary="Holder expressions" border="1" cellpadding="5"> <tr> <td><b>Expression</b></td> <td><b>Requirements</b></td> </tr> <tr> <td valign="top"><code>G::apply<X>::type</code></td> <td>A concrete subclass of <a href="instance_holder.html#instance_holder-spec">instance_holder</a> which can hold objects of type <code>X</code>. </tr> </table> <hr> <p>Revised <!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan --> 13 November, 2002 <!--webbot bot="Timestamp" endspan i-checksum="39359" --> </p> <p><i>© Copyright <a href="../../../../people/dave_abrahams.htm">Dave Abrahams</a> 2002. All Rights Reserved.</i> <p>Permission to copy, use, modify, sell and distribute this software is granted provided this copyright notice appears in all copies. This software is provided "as is" without express or implied warranty, and with no claim as to its suitability for any purpose. </body> </html>