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<td class="header-group page-location"><a href="../refmanual.html" class="navigation-link">Front Page</a> / <a href="./sequences.html" class="navigation-link">Sequences</a> / <a href="./concepts.html" class="navigation-link">Concepts</a> / <a href="./random-access-sequence.html" class="navigation-link">Random Access Sequence</a></td>
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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>
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<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>
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<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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<tr><th class="head">Expression</th>
<th class="head">Type</th>
<th class="head">Complexity</th>
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<tr><td><tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a>&lt;s&gt;::type</span></tt></td>
<td><a class="reference internal" href="./random-access-iterator.html">Random Access Iterator</a></td>
<td>Amortized constant time</td>
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<tr><td><tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a>&lt;s&gt;::type</span></tt></td>
<td><a class="reference internal" href="./random-access-iterator.html">Random Access Iterator</a></td>
<td>Amortized constant time</td>
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<tr><td><tt class="literal"><span class="pre"><a href="./at.html" class="identifier">at</a>&lt;s,n&gt;::type</span></tt></td>
<td>Any type</td>
<td>Amortized constant time</td>
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<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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<tr><td><tt class="literal"><span class="pre"><a href="./at.html" class="identifier">at</a>&lt;s,n&gt;::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>
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<div class="section" id="id10">
<h3><a class="subsection-title" href="#models" name="models">Models</a></h3>
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<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 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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