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| <div class="document" id="incrementable-iterator-concept"> |
| <h1 class="title">Incrementable Iterator 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>Incrementable Iterator</em> |
| concept if, in addition to <tt class="docutils literal"><span class="pre">X</span></tt> being Assignable and Copy |
| Constructible, the following expressions are valid and respect the |
| stated semantics.</p> |
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| <colgroup> |
| <col width="39%" /> |
| <col width="37%" /> |
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| </colgroup> |
| <thead valign="bottom"> |
| <tr><th class="head" colspan="3">Incrementable Iterator Requirements (in addition to Assignable, Copy Constructible)</th> |
| </tr> |
| <tr><th class="head">Expression</th> |
| <th class="head">Return Type</th> |
| <th class="head">Assertion/Semantics</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><tt class="docutils literal"><span class="pre">&r</span> <span class="pre">==</span> <span class="pre">&++r</span></tt></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><pre class="first last literal-block"> |
| { |
| X tmp = r; |
| ++r; |
| return tmp; |
| } |
| </pre> |
| </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">incrementable_traversal_tag</span></tt></td> |
| <td> </td> |
| </tr> |
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