45 lines
4.9 KiB
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45 lines
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<title>The MPL Reference Manual: Concepts</title>
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<table class="header"><tr class="header"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./iterators.html" class="navigation-link">Prev</a> <a href="./forward-iterator.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group">Back <a href="./iterator-metafunctions.html" class="navigation-link">Along</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./iterators.html" class="navigation-link">Up</a> <a href="../refmanual.html" class="navigation-link">Home</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./refmanual_toc.html" class="navigation-link">Full TOC</a></span></td>
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<div class="section" id="id382">
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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>
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<p id="label-iterators-concepts">All iterators in MPL are classified into three iterator concepts, or
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<cite>categories</cite>, named according to the type of traversal provided. The
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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
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<a class="reference internal" href="./random-access-iterator.html">Random Access Iterator</a>. The concepts are hierarchical:
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<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>,
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which, in its turn, is a refinement of <a class="reference internal" href="./forward-iterator.html">Forward Iterator</a>.</p>
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<p>Because of the inherently immutable nature of the value access, MPL
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iterators escape the problems of the traversal-only categorization
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discussed at length in <a class="citation-reference" href="#n1550" id="id383">[n1550]</a>.</p>
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<table class="docutils citation" frame="void" id="n1550" rules="none">
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<colgroup><col class="label" /><col /></colgroup>
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<tbody valign="top">
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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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</table>
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<!-- Iterators/Concepts//Forward Iterator |10 -->
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<ul class="toc simple" id="outline">
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<li><a class="reference internal" href="./forward-iterator.html" id="id1450">Forward Iterator</a></li>
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<li><a class="reference internal" href="./bidirectional-iterator.html" id="id1451">Bidirectional Iterator</a></li>
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<li><a class="reference internal" href="./random-access-iterator.html" id="id1452">Random Access Iterator</a></li>
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<td><div class="copyright-footer"><div class="copyright">Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams</div>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at <a class="reference external" href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)</div></td></tr></table></body>
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