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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> |
| <col width="28%" /> |
| <col width="44%" /> |
| <col width="28%" /> |
| </colgroup> |
| <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" /> |
| <col class="field-body" /> |
| <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" /> |
| <col class="field-body" /> |
| <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="./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> |
| Distributed under the Boost Software License, Version 1.0. (See accompanying |
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