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| <div class="document" id="single-pass-iterator-concept"> |
| <h1 class="title">Single Pass Iterator Concept</h1> |
| |
| <!-- Copyright David Abrahams 2006. Distributed under the Boost --> |
| <!-- Software License, Version 1.0. (See accompanying --> |
| <!-- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) --> |
| <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> |
| </tbody> |
| </table> |
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