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<h1 class="title">Swappable Iterator Concept</h1>
<!-- Copyright David Abrahams 2006. Distributed under the Boost -->
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<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>
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<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>
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<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>
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<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>
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