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| <title>Readable Iterator Concept</title> |
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| <div class="document" id="readable-iterator-concept"> |
| <h1 class="title">Readable 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>Readable Iterator</em> concept |
| for value type <tt class="docutils literal"><span class="pre">T</span></tt> 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. <tt class="docutils literal"><span class="pre">U</span></tt> is the type of any specified member of |
| type <tt class="docutils literal"><span class="pre">T</span></tt>.</p> |
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| <colgroup> |
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| <thead valign="bottom"> |
| <tr><th class="head" colspan="3">Readable Iterator Requirements (in addition to Assignable and Copy Constructible)</th> |
| </tr> |
| <tr><th class="head">Expression</th> |
| <th class="head">Return Type</th> |
| <th class="head">Note/Precondition</th> |
| </tr> |
| </thead> |
| <tbody valign="top"> |
| <tr><td><tt class="docutils literal"><span class="pre">iterator_traits<X>::value_type</span></tt></td> |
| <td><tt class="docutils literal"><span class="pre">T</span></tt></td> |
| <td>Any non-reference, |
| non-cv-qualified type</td> |
| </tr> |
| <tr><td><tt class="docutils literal"><span class="pre">*a</span></tt></td> |
| <td>Convertible to <tt class="docutils literal"><span class="pre">T</span></tt></td> |
| <td><dl class="first last docutils"> |
| <dt>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></dt> |
| <dd>is equivalent to <tt class="docutils literal"><span class="pre">*b</span></tt>.</dd> |
| </dl> |
| </td> |
| </tr> |
| <tr><td><tt class="docutils literal"><span class="pre">a->m</span></tt></td> |
| <td><tt class="docutils literal"><span class="pre">U&</span></tt></td> |
| <td>pre: <tt class="docutils literal"><span class="pre">pre:</span> <span class="pre">(*a).m</span></tt> is well-defined. Equivalent to <tt class="docutils literal"><span class="pre">(*a).m</span></tt>.</td> |
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