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- <title>The MPL Reference Manual: Random Access Iterator</title>
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- <div class="section" id="random-access-iterator">
- <h1><a class="toc-backref" href="./iterators-concepts.html#id1452">Random Access Iterator</a></h1>
- <div class="section" id="id397">
- <h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
- <p>A <a class="reference internal" href="./random-access-iterator.html">Random Access Iterator</a> is a <a class="reference internal" href="./bidirectional-iterator.html">Bidirectional Iterator</a> that provides
- constant-time guarantees on moving the iterator an arbitrary number of positions
- forward or backward and for measuring the distance to another iterator in the
- same sequence.</p>
- </div>
- <div class="section" id="id398">
- <h3><a class="subsection-title" href="#refinement-of" name="refinement-of">Refinement of</a></h3>
- <p><a class="reference internal" href="./bidirectional-iterator.html">Bidirectional Iterator</a></p>
- </div>
- <div class="section" id="id399">
- <h3><a class="subsection-title" href="#expression-requirements" name="expression-requirements">Expression requirements</a></h3>
- <p>In addition to the requirements defined in <a class="reference internal" href="./bidirectional-iterator.html">Bidirectional Iterator</a>,
- the following requirements must be met.</p>
- <table border="1" class="docutils table">
- <colgroup>
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- <col width="44%" />
- <col width="28%" />
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- <thead valign="bottom">
- <tr><th class="head">Expression</th>
- <th class="head">Type</th>
- <th class="head">Complexity</th>
- </tr>
- </thead>
- <tbody valign="top">
- <tr><td><tt class="literal"><span class="pre"><a href="./next.html" class="identifier">next</a><i>::type</span></tt></td>
- <td><a class="reference internal" href="./random-access-iterator.html">Random Access Iterator</a></td>
- <td>Amortized constant time</td>
- </tr>
- <tr><td><tt class="literal"><span class="pre"><a href="./prior.html" class="identifier">prior</a><i>::type</span></tt></td>
- <td><a class="reference internal" href="./random-access-iterator.html">Random Access Iterator</a></td>
- <td>Amortized constant time</td>
- </tr>
- <tr><td><tt class="literal"><span class="pre">i::category</span></tt></td>
- <td><a class="reference internal" href="./integral-constant.html">Integral Constant</a>, convertible
- to <tt class="literal"><span class="pre">random_access_iterator_tag</span></tt></td>
- <td>Constant time</td>
- </tr>
- <tr><td><tt class="literal"><span class="pre"><a href="./advance.html" class="identifier">advance</a><i,n>::type</span></tt></td>
- <td><a class="reference internal" href="./random-access-iterator.html">Random Access Iterator</a></td>
- <td>Amortized constant time</td>
- </tr>
- <tr><td><tt class="literal"><span class="pre"><a href="./distance.html" class="identifier">distance</a><i,j>::type</span></tt></td>
- <td><a class="reference internal" href="./integral-constant.html">Integral Constant</a></td>
- <td>Amortized constant time</td>
- </tr>
- </tbody>
- </table>
- </div>
- <div class="section" id="id400">
- <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
- <pre class="literal-block">
- typedef <a href="./advance.html" class="identifier">advance</a><i,n>::type j;
- </pre>
- <table class="docutils field-list" frame="void" rules="none">
- <col class="field-name" />
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- <tbody valign="top">
- <tr class="field"><th class="field-name">Semantics:</th><td class="field-body">See <tt class="literal"><span class="pre"><a href="./advance.html" class="identifier">advance</a></span></tt> specification</td>
- </tr>
- </tbody>
- </table>
- <!-- .......................................................................... -->
- <pre class="literal-block">
- typedef <a href="./distance.html" class="identifier">distance</a><i,j>::type n;
- </pre>
- <table class="docutils field-list" frame="void" rules="none">
- <col class="field-name" />
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- <tr class="field"><th class="field-name">Semantics:</th><td class="field-body">See <tt class="literal"><span class="pre"><a href="./distance.html" class="identifier">distance</a></span></tt> specification</td>
- </tr>
- </tbody>
- </table>
- </div>
- <div class="section" id="id401">
- <h3><a class="subsection-title" href="#invariants" name="invariants">Invariants</a></h3>
- <p>For any random access iterators <tt class="literal"><span class="pre">i</span></tt> and <tt class="literal"><span class="pre">j</span></tt> the following invariants always
- hold:</p>
- <ul class="simple">
- <li>If <tt class="literal"><span class="pre"><a href="./advance.html" class="identifier">advance</a><i,n>::type</span></tt> is well-defined, then
- <tt class="literal"><span class="pre"><a href="./advance.html" class="identifier">advance</a><</span> <span class="pre"><a href="./advance.html" class="identifier">advance</a><i,n>::type,</span> <span class="pre"><a href="./negate.html" class="identifier">negate</a><n>::type</span> <span class="pre">>::type</span></tt> is a null operation.</li>
- </ul>
- </div>
- <div class="section" id="id402">
- <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
- <p><a class="reference internal" href="./iterators.html">Iterators</a>, <a class="reference internal" href="./bidirectional-iterator.html">Bidirectional Iterator</a>, <a class="reference internal" href="./random-access-sequence.html">Random Access Sequence</a>, <a class="reference internal" href="./advance.html">advance</a>, <a class="reference internal" href="./distance.html">distance</a></p>
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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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