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| <div class="document" id="lvalue-iterator-concept"> |
| <h1 class="title">Lvalue Iterator Concept</h1> |
| |
| <!-- Copyright David Abrahams 2006. Distributed under the Boost --> |
| <!-- Software License, Version 1.0. (See accompanying --> |
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| <p>The <em>Lvalue Iterator</em> concept adds the requirement that the return |
| type of <tt class="docutils literal"><span class="pre">operator*</span></tt> type be a reference to the value type of the |
| iterator.</p> |
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| <thead valign="bottom"> |
| <tr><th class="head" colspan="3">Lvalue Iterator Requirements</th> |
| </tr> |
| <tr><th class="head">Expression</th> |
| <th class="head">Return Type</th> |
| <th class="head">Note/Assertion</th> |
| </tr> |
| </thead> |
| <tbody valign="top"> |
| <tr><td><tt class="docutils literal"><span class="pre">*a</span></tt></td> |
| <td><tt class="docutils literal"><span class="pre">T&</span></tt></td> |
| <td><tt class="docutils literal"><span class="pre">T</span></tt> is <em>cv</em> |
| <tt class="docutils literal"><span class="pre">iterator_traits<X>::value_type</span></tt> |
| where <em>cv</em> is an optional |
| cv-qualification. |
| pre: <tt class="docutils literal"><span class="pre">a</span></tt> is |
| dereferenceable. If <tt class="docutils literal"><span class="pre">a</span> |
| <span class="pre">==</span> <span class="pre">b</span></tt> then <tt class="docutils literal"><span class="pre">*a</span></tt> is |
| equivalent to <tt class="docutils literal"><span class="pre">*b</span></tt>.</td> |
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