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new files for iterator concepts

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[SVN r22004]
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Jeremy Siek
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<?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 0.3.1: http://docutils.sourceforge.net/" />
<title>Swappable Iterator Concept</title>
<link rel="stylesheet" href="default.css" type="text/css" />
</head>
<body>
<div class="document" id="swappable-iterator-concept">
<h1 class="title">Swappable Iterator Concept</h1>
<p>A class or built-in type <tt class="literal"><span class="pre">X</span></tt> models the <em>Swappable Iterator</em> concept
if, in addition to <tt class="literal"><span class="pre">X</span></tt> being Copy Constructible, the following
expressions are valid and respect the stated semantics.</p>
<table border class="table">
<colgroup>
<col width="37%" />
<col width="19%" />
<col width="43%" />
</colgroup>
<thead valign="bottom">
<tr><th colspan="3">Swappable Iterator Requirements (in addition to Copy Constructible)</th>
</tr>
<tr><th>Expression</th>
<th>Return Type</th>
<th>Postcondition</th>
</tr>
</thead>
<tbody valign="top">
<tr><td><tt class="literal"><span class="pre">iter_swap(a,</span> <span class="pre">b)</span></tt></td>
<td><tt class="literal"><span class="pre">void</span></tt></td>
<td>the pointed to values are
exchanged</td>
</tr>
</tbody>
</table>
<dl>
<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>
<hr class="footer" />
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</div>
</body>
</html>