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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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| <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> |
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| <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> |
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