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| <div class="section" id="random-access-sequence"> |
| <h1><a class="toc-backref" href="./concepts.html#id1397">Random Access Sequence</a></h1> |
| <div class="section" id="id6"> |
| <h3><a class="subsection-title" href="#description" name="description">Description</a></h3> |
| <p>A <a class="reference internal" href="./random-access-sequence.html">Random Access Sequence</a> is a <a class="reference internal" href="./bidirectional-sequence.html">Bidirectional Sequence</a> whose iterators model |
| <a class="reference internal" href="./random-access-iterator.html">Random Access Iterator</a>. A random access sequence guarantees amortized constant |
| time access to an arbitrary sequence element.</p> |
| </div> |
| <div class="section" id="id7"> |
| <h3><a class="subsection-title" href="#refinement-of" name="refinement-of">Refinement of</a></h3> |
| <p><a class="reference internal" href="./bidirectional-sequence.html">Bidirectional Sequence</a></p> |
| </div> |
| <div class="section" id="id8"> |
| <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-sequence.html">Bidirectional Sequence</a>, |
| for any <a class="reference internal" href="./random-access-sequence.html">Random Access Sequence</a> <tt class="literal"><span class="pre">s</span></tt> the following must be met:</p> |
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| <thead valign="bottom"> |
| <tr><th class="head">Expression</th> |
| <th class="head">Type</th> |
| <th class="head">Complexity</th> |
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| <tbody valign="top"> |
| <tr><td><tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a><s>::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="./end.html" class="identifier">end</a><s>::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="./at.html" class="identifier">at</a><s,n>::type</span></tt></td> |
| <td>Any type</td> |
| <td>Amortized constant time</td> |
| </tr> |
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| </table> |
| </div> |
| <div class="section" id="id9"> |
| <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3> |
| <p>Semantics of an expression is defined only where it differs from, or is not |
| defined in <a class="reference internal" href="./bidirectional-sequence.html">Bidirectional Sequence</a>.</p> |
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| <colgroup> |
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| <thead valign="bottom"> |
| <tr><th class="head">Expression</th> |
| <th class="head">Semantics</th> |
| </tr> |
| </thead> |
| <tbody valign="top"> |
| <tr><td><tt class="literal"><span class="pre"><a href="./at.html" class="identifier">at</a><s,n>::type</span></tt></td> |
| <td>The <tt class="literal"><span class="pre">n</span></tt>th element from the beginning of the sequence; see <a class="reference internal" href="./at.html">at</a>.</td> |
| </tr> |
| </tbody> |
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| <div class="section" id="id10"> |
| <h3><a class="subsection-title" href="#models" name="models">Models</a></h3> |
| <ul class="simple"> |
| <li><a class="reference internal" href="./vector.html">vector</a></li> |
| <li><a class="reference internal" href="./range-c.html">range_c</a></li> |
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| </div> |
| <div class="section" id="id11"> |
| <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3> |
| <p><a class="reference internal" href="./sequences.html">Sequences</a>, <a class="reference internal" href="./bidirectional-sequence.html">Bidirectional Sequence</a>, <a class="reference internal" href="./extensible-sequence.html">Extensible Sequence</a>, <a class="reference internal" href="./random-access-iterator.html">Random Access Iterator</a>, |
| <a class="reference internal" href="./begin.html">begin</a> / <a class="reference internal" href="./end.html">end</a>, <a class="reference internal" href="./at.html">at</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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