<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>Concept EqualityComparable</title> <link rel="stylesheet" href="boostbook.css" type="text/css"> <meta name="generator" content="DocBook XSL Stylesheets V1.75.2"> <link rel="home" href="index.html" title="The Boost C++ Libraries BoostBook Documentation Subset"> <link rel="up" href="id313989-bb.html#concepts.reference" title="Concept reference"> <link rel="prev" href="CopyConstructible.html" title="Concept CopyConstructible"> <link rel="next" href="LessThanComparable.html" title="Concept LessThanComparable"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <table cellpadding="2" width="100%"><tr> <td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../boost.png"></td> <td align="center"><a href="../../index.html">Home</a></td> <td align="center"><a href="../../libs/libraries.htm">Libraries</a></td> <td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> <td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> <td align="center"><a href="../../more/index.htm">More</a></td> </tr></table> <hr> <div class="spirit-nav"> <a accesskey="p" href="CopyConstructible.html"><img src="../../doc/html/images/prev.png" alt="Prev"></a><a accesskey="u" href="id313989-bb.html#concepts.reference"><img src="../../doc/html/images/up.png" alt="Up"></a><a accesskey="h" href="index.html"><img src="../../doc/html/images/home.png" alt="Home"></a><a accesskey="n" href="LessThanComparable.html"><img src="../../doc/html/images/next.png" alt="Next"></a> </div> <div class="refentry" title="Concept EqualityComparable"> <a name="EqualityComparable"></a><div class="titlepage"></div> <div class="refnamediv"> <h2><span class="refentrytitle">Concept EqualityComparable</span></h2> <p>EqualityComparable</p> </div> <div class="refsect1" title="Description"> <a name="id731417"></a><h2>Description</h2> <p>Equality Comparable types must have <code class="computeroutput">==</code> and <code class="computeroutput">!=</code> operators.</p> </div> <div class="refsect1" title="Notation"> <a name="id731435"></a><h2>Notation</h2> <div class="variablelist"><dl> <dt><span class="term">X</span></dt> <dd>A type playing the role of comparable-type in the <a class="link" href="EqualityComparable.html" title="Concept EqualityComparable">EqualityComparable</a> concept.</dd> <dt> <span class="term"><code class="varname">x</code>, </span><span class="term"><code class="varname">y</code></span> </dt> <dd>Objects of type X</dd> </dl></div> </div> <div class="refsect1" title="Valid expressions"> <a name="id731466"></a><h2>Valid expressions</h2> <div class="informaltable"><table class="table"> <colgroup> <col> <col> <col> </colgroup> <thead><tr> <th>Name</th> <th>Expression</th> <th>Type</th> </tr></thead> <tbody> <tr> <td><p>Equality test</p></td> <td><p>x == y</p></td> <td><p>Convertible to <span class="type">bool</span></p></td> </tr> <tr> <td><p>Inequality test</p></td> <td><p>x != y</p></td> <td><p>Convertible to <span class="type">bool</span></p></td> </tr> </tbody> </table></div> </div> <div class="refsect1" title="Models"> <a name="id731512"></a><h2>Models</h2> <div class="itemizedlist"><ul class="itemizedlist" type="disc"> <li class="listitem"><span class="simplelist"><span class="type">int</span></span></li> <li class="listitem"><span class="simplelist"><span class="type">std::vector<int></span></span></li> </ul></div> </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 © 2001, 2002 Indiana University<br>Copyright © 2000, 2001 University of Notre Dame du Lac<br>Copyright © 2000 Jeremy Siek, Lie-Quan Lee, Andrew Lumsdaine<br>Copyright © 1996-1999 Silicon Graphics Computer Systems, Inc.<br>Copyright © 1994 Hewlett-Packard Company<p>Distributed under the Boost Software License, Version 1.0. (See accompanying file <code class="filename">LICENSE_1_0.txt</code> 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> <p>This product includes software developed at the University of Notre Dame and the Pervasive Technology Labs at Indiana University. For technical information contact Andrew Lumsdaine at the Pervasive Technology Labs at Indiana University. For administrative and license questions contact the Advanced Research and Technology Institute at 351 West 10th Street. Indianapolis, Indiana 46202, phone 317-278-4100, fax 317-274-5902.</p> <p>Some concepts based on versions from the MTL draft manual and Boost Graph and Property Map documentation, the SGI Standard Template Library documentation and the Hewlett-Packard STL, under the following license: </p> <div class="blockquote"><blockquote class="blockquote"><p>Permission to use, copy, modify, distribute and sell this software and its documentation for any purpose is hereby granted without fee, provided that the above copyright notice appears in all copies and that both that copyright notice and this permission notice appear in supporting documentation. Silicon Graphics makes no representations about the suitability of this software for any purpose. 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