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10<title>The MPL Reference Manual: Random Access Sequence</title>
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13<body class="docframe refmanual">
14<table class="header"><tr class="header"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./bidirectional-sequence.html" class="navigation-link">Prev</a>&nbsp;<a href="./extensible-sequence.html" class="navigation-link">Next</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group"><a href="./bidirectional-sequence.html" class="navigation-link">Back</a>&nbsp;<a href="./extensible-sequence.html" class="navigation-link">Along</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group"><a href="./concepts.html" class="navigation-link">Up</a>&nbsp;<a href="../refmanual.html" class="navigation-link">Home</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group"><a href="./refmanual_toc.html" class="navigation-link">Full TOC</a></span></td>
15<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>
16</tr></table><div class="header-separator"></div>
17<div class="section" id="random-access-sequence">
18<h1><a class="toc-backref" href="./concepts.html#id326" name="random-access-sequence">Random Access Sequence</a></h1>
19<div class="section" id="random-description">
20<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
21<p>A <a class="reference" href="./random-access-sequence.html">Random Access Sequence</a> is a <a class="reference" href="./bidirectional-sequence.html">Bidirectional Sequence</a> whose iterators model
22<a class="reference" href="./random-access-iterator.html">Random Access Iterator</a>. A random access sequence guarantees amortized constant
23time access to an arbitrary sequence element.</p>
24</div>
25<div class="section" id="random-refinement-of">
26<h3><a class="subsection-title" href="#refinement-of" name="refinement-of">Refinement of</a></h3>
27<p><a class="reference" href="./bidirectional-sequence.html">Bidirectional Sequence</a></p>
28</div>
29<div class="section" id="random-expression-requirements">
30<h3><a class="subsection-title" href="#expression-requirements" name="expression-requirements">Expression requirements</a></h3>
31<p>In addition to the requirements defined in <a class="reference" href="./bidirectional-sequence.html">Bidirectional Sequence</a>,
32for any <a class="reference" href="./random-access-sequence.html">Random Access Sequence</a> <tt class="literal"><span class="pre">s</span></tt> the following must be met:</p>
33<table border="1" class="table">
34<colgroup>
35<col width="30%" />
36<col width="39%" />
37<col width="30%" />
38</colgroup>
39<thead valign="bottom">
40<tr><th>Expression</th>
41<th>Type</th>
42<th>Complexity</th>
43</tr>
44</thead>
45<tbody valign="top">
46<tr><td><tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a>&lt;s&gt;::type</span></tt></td>
47<td><a class="reference" href="./random-access-iterator.html">Random Access Iterator</a></td>
48<td>Amortized constant time</td>
49</tr>
50<tr><td><tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a>&lt;s&gt;::type</span></tt></td>
51<td><a class="reference" href="./random-access-iterator.html">Random Access Iterator</a></td>
52<td>Amortized constant time</td>
53</tr>
54<tr><td><tt class="literal"><span class="pre"><a href="./at.html" class="identifier">at</a>&lt;s,n&gt;::type</span></tt></td>
55<td>Any type</td>
56<td>Amortized constant time</td>
57</tr>
58</tbody>
59</table>
60</div>
61<div class="section" id="random-expression-semantics">
62<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
63<p>Semantics of an expression is defined only where it differs from, or is not
64defined in <a class="reference" href="./bidirectional-sequence.html">Bidirectional Sequence</a>.</p>
65<table border="1" class="table">
66<colgroup>
67<col width="28%" />
68<col width="72%" />
69</colgroup>
70<thead valign="bottom">
71<tr><th>Expression</th>
72<th>Semantics</th>
73</tr>
74</thead>
75<tbody valign="top">
76<tr><td><tt class="literal"><span class="pre"><a href="./at.html" class="identifier">at</a>&lt;s,n&gt;::type</span></tt></td>
77<td>The <tt class="literal"><span class="pre">n</span></tt>th element from the beginning of the sequence; see <a class="refentry reference" href="./at.html"><tt class="refentry literal"><span class="pre">at</span></tt></a>.</td>
78</tr>
79</tbody>
80</table>
81</div>
82<div class="section" id="random-models">
83<h3><a class="subsection-title" href="#models" name="models">Models</a></h3>
84<ul class="simple">
85<li><a class="refentry reference" href="./vector.html"><tt class="refentry literal"><span class="pre">vector</span></tt></a></li>
86<li><a class="refentry reference" href="./range-c.html"><tt class="refentry literal"><span class="pre">range_c</span></tt></a></li>
87</ul>
88</div>
89<div class="section" id="random-see-also">
90<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
91<p><a class="reference" href="./sequences.html">Sequences</a>, <a class="reference" href="./bidirectional-sequence.html">Bidirectional Sequence</a>, <a class="reference" href="./extensible-sequence.html">Extensible Sequence</a>, <a class="reference" href="./random-access-iterator.html">Random Access Iterator</a>,
92<a class="refentry reference" href="./begin.html"><tt class="refentry literal"><span class="pre">begin</span></tt></a> / <a class="refentry reference" href="./end.html"><tt class="refentry literal"><span class="pre">end</span></tt></a>, <a class="refentry reference" href="./at.html"><tt class="refentry literal"><span class="pre">at</span></tt></a></p>
93<!-- modtime: November 13, 2004 00:40:54 +0000 -->
94<!-- Sequences/Concepts//Extensible Sequence |40 -->
95</div>
96</div>
97
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