<?xml version="1.0" encoding="utf-8" ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta name="generator" content="Docutils 0.5: http://docutils.sourceforge.net/" /> <title>Swappable Iterator Concept</title> <link rel="stylesheet" href="../../../rst.css" type="text/css" /> </head> <body> <div class="document" id="swappable-iterator-concept"> <h1 class="title">Swappable Iterator Concept</h1> <!-- Copyright David Abrahams 2006. Distributed under the Boost --> <!-- Software License, Version 1.0. (See accompanying --> <!-- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) --> <p>A class or built-in type <tt class="docutils literal"><span class="pre">X</span></tt> models the <em>Swappable Iterator</em> concept if, in addition to <tt class="docutils literal"><span class="pre">X</span></tt> being Copy Constructible, the following expressions are valid and respect the stated semantics.</p> <table border="1" class="docutils"> <colgroup> <col width="37%" /> <col width="19%" /> <col width="43%" /> </colgroup> <thead valign="bottom"> <tr><th class="head" colspan="3">Swappable Iterator Requirements (in addition to Copy Constructible)</th> </tr> <tr><th class="head">Expression</th> <th class="head">Return Type</th> <th class="head">Postcondition</th> </tr> </thead> <tbody valign="top"> <tr><td><tt class="docutils literal"><span class="pre">iter_swap(a,</span> <span class="pre">b)</span></tt></td> <td><tt class="docutils literal"><span class="pre">void</span></tt></td> <td>the pointed to values are exchanged</td> </tr> </tbody> </table> <dl class="docutils"> <dt>[<em>Note:</em> An iterator that is a model of the <em>Readable</em> and <em>Writable Iterator</em> concepts</dt> <dd>is also a model of <em>Swappable Iterator</em>. <em>--end note</em>]</dd> </dl> </div> <div class="footer"> <hr class="footer" /> <a class="reference external" href="SwappableIterator.rst">View document source</a>. Generated by <a class="reference external" href="http://docutils.sourceforge.net/">Docutils</a> from <a class="reference external" href="http://docutils.sourceforge.net/rst.html">reStructuredText</a> source. </div> </body> </html>