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| <h1 class="title">Forward Traversal Concept</h1> |
| |
| <!-- Copyright David Abrahams 2006. Distributed under the Boost --> |
| <!-- Software License, Version 1.0. (See accompanying --> |
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| <p>A class or built-in type <tt class="docutils literal"><span class="pre">X</span></tt> models the <em>Forward Traversal</em> |
| concept if, in addition to <tt class="docutils literal"><span class="pre">X</span></tt> meeting the requirements of Default |
| Constructible and Single Pass Iterator, the following expressions are |
| valid and respect the stated semantics.</p> |
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| <col width="38%" /> |
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| <thead valign="bottom"> |
| <tr><th class="head" colspan="3">Forward Traversal Iterator Requirements (in addition to Default Constructible and Single Pass Iterator)</th> |
| </tr> |
| <tr><th class="head">Expression</th> |
| <th class="head">Return Type</th> |
| <th class="head">Assertion/Note</th> |
| </tr> |
| </thead> |
| <tbody valign="top"> |
| <tr><td><tt class="docutils literal"><span class="pre">X</span> <span class="pre">u;</span></tt></td> |
| <td><tt class="docutils literal"><span class="pre">X&</span></tt></td> |
| <td>note: <tt class="docutils literal"><span class="pre">u</span></tt> may have a |
| singular value.</td> |
| </tr> |
| <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><tt class="docutils literal"><span class="pre">r</span> <span class="pre">==</span> <span class="pre">s</span></tt> and <tt class="docutils literal"><span class="pre">r</span></tt> is |
| dereferenceable implies |
| <tt class="docutils literal"><span class="pre">++r</span> <span class="pre">==</span> <span class="pre">++s.</span></tt></td> |
| </tr> |
| <tr><td><tt class="docutils literal"><span class="pre">iterator_traits<X>::difference_type</span></tt></td> |
| <td>A signed integral type representing |
| the distance between iterators</td> |
| <td> </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">forward_traversal_tag</span></tt></td> |
| <td> </td> |
| </tr> |
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