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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>
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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>
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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>
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