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- <h1 class="title">Single Pass 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>Single Pass Iterator</em>
- concept if the following expressions are valid and respect the stated
- semantics.</p>
- <table border="1" class="docutils">
- <colgroup>
- <col width="36%" />
- <col width="33%" />
- <col width="31%" />
- </colgroup>
- <thead valign="bottom">
- <tr><th class="head" colspan="3">Single Pass Iterator Requirements (in addition to Incrementable Iterator and Equality
- Comparable)</th>
- </tr>
- <tr><th class="head">Expression</th>
- <th class="head">Return Type</th>
- <th class="head">Assertion/Semantics /
- Pre-/Post-condition</th>
- </tr>
- </thead>
- <tbody valign="top">
- <tr><td><tt class="docutils literal"><span class="pre">++r</span></tt></td>
- <td><tt class="docutils literal"><span class="pre">X&</span></tt></td>
- <td>pre: <tt class="docutils literal"><span class="pre">r</span></tt> is
- dereferenceable; post:
- <tt class="docutils literal"><span class="pre">r</span></tt> is dereferenceable or
- <tt class="docutils literal"><span class="pre">r</span></tt> is past-the-end</td>
- </tr>
- <tr><td><tt class="docutils literal"><span class="pre">a</span> <span class="pre">==</span> <span class="pre">b</span></tt></td>
- <td>convertible to <tt class="docutils literal"><span class="pre">bool</span></tt></td>
- <td><tt class="docutils literal"><span class="pre">==</span></tt> is an equivalence
- relation over its domain</td>
- </tr>
- <tr><td><tt class="docutils literal"><span class="pre">a</span> <span class="pre">!=</span> <span class="pre">b</span></tt></td>
- <td>convertible to <tt class="docutils literal"><span class="pre">bool</span></tt></td>
- <td><tt class="docutils literal"><span class="pre">!(a</span> <span class="pre">==</span> <span class="pre">b)</span></tt></td>
- </tr>
- <tr><td><tt class="docutils literal"><span class="pre">iterator_traversal<X>::type</span></tt></td>
- <td>Convertible to
- <tt class="docutils literal"><span class="pre">single_pass_traversal_tag</span></tt></td>
- <td> </td>
- </tr>
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