1<?xml version="1.0" encoding="utf-8" ?> 2<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 3<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> 4<head> 5<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 6<meta name="generator" content="Docutils 0.5: http://docutils.sourceforge.net/" /> 7<title>Swappable Iterator Concept</title> 8<link rel="stylesheet" href="../../../rst.css" type="text/css" /> 9</head> 10<body> 11<div class="document" id="swappable-iterator-concept"> 12<h1 class="title">Swappable Iterator Concept</h1> 13 14<!-- Copyright David Abrahams 2006. Distributed under the Boost --> 15<!-- Software License, Version 1.0. (See accompanying --> 16<!-- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) --> 17<p>A class or built-in type <tt class="docutils literal"><span class="pre">X</span></tt> models the <em>Swappable Iterator</em> concept 18if, in addition to <tt class="docutils literal"><span class="pre">X</span></tt> being Copy Constructible, the following 19expressions are valid and respect the stated semantics.</p> 20<table border="1" class="docutils"> 21<colgroup> 22<col width="37%" /> 23<col width="19%" /> 24<col width="43%" /> 25</colgroup> 26<thead valign="bottom"> 27<tr><th class="head" colspan="3">Swappable Iterator Requirements (in addition to Copy Constructible)</th> 28</tr> 29<tr><th class="head">Expression</th> 30<th class="head">Return Type</th> 31<th class="head">Postcondition</th> 32</tr> 33</thead> 34<tbody valign="top"> 35<tr><td><tt class="docutils literal"><span class="pre">iter_swap(a,</span> <span class="pre">b)</span></tt></td> 36<td><tt class="docutils literal"><span class="pre">void</span></tt></td> 37<td>the pointed to values are 38exchanged</td> 39</tr> 40</tbody> 41</table> 42<dl class="docutils"> 43<dt>[<em>Note:</em> An iterator that is a model of the <em>Readable</em> and <em>Writable Iterator</em> concepts</dt> 44<dd>is also a model of <em>Swappable Iterator</em>. <em>--end note</em>]</dd> 45</dl> 46</div> 47<div class="footer"> 48<hr class="footer" /> 49<a class="reference external" href="SwappableIterator.rst">View document source</a>. 50Generated 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. 51 52</div> 53</body> 54</html> 55