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- <h1><a class="toc-backref" href="./iterators.html#id1449"><a class="subsection-title" href="#concepts" name="concepts">Concepts</a></a></h1>
- <p id="label-iterators-concepts">All iterators in MPL are classified into three iterator concepts, or
- <cite>categories</cite>, named according to the type of traversal provided. The
- categories are: <a class="reference internal" href="./forward-iterator.html">Forward Iterator</a>, <a class="reference internal" href="./bidirectional-iterator.html">Bidirectional Iterator</a>, and
- <a class="reference internal" href="./random-access-iterator.html">Random Access Iterator</a>. The concepts are hierarchical:
- <a class="reference internal" href="./random-access-iterator.html">Random Access Iterator</a> is a refinement of <a class="reference internal" href="./bidirectional-iterator.html">Bidirectional Iterator</a>,
- which, in its turn, is a refinement of <a class="reference internal" href="./forward-iterator.html">Forward Iterator</a>.</p>
- <p>Because of the inherently immutable nature of the value access, MPL
- iterators escape the problems of the traversal-only categorization
- discussed at length in <a class="citation-reference" href="#n1550" id="id383">[n1550]</a>.</p>
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- <tr><td class="label"><a class="fn-backref" href="#id383">[n1550]</a></td><td><a class="reference external" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2003/n1550.htm" target="_top">http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2003/n1550.htm</a></td></tr>
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