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7<title>The MPL Reference Manual: Random Access Sequence</title>
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11<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>
12<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>
13</tr></table><div class="header-separator"></div>
14<div class="section" id="random-access-sequence">
15<h1><a class="toc-backref" href="./concepts.html#id326" name="random-access-sequence">Random Access Sequence</a></h1>
16<div class="section" id="random-description">
17<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
18<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
19<a class="reference" href="./random-access-iterator.html">Random Access Iterator</a>. A random access sequence guarantees amortized constant
20time access to an arbitrary sequence element.</p>
21</div>
22<div class="section" id="random-refinement-of">
23<h3><a class="subsection-title" href="#refinement-of" name="refinement-of">Refinement of</a></h3>
24<p><a class="reference" href="./bidirectional-sequence.html">Bidirectional Sequence</a></p>
25</div>
26<div class="section" id="random-expression-requirements">
27<h3><a class="subsection-title" href="#expression-requirements" name="expression-requirements">Expression requirements</a></h3>
28<p>In addition to the requirements defined in <a class="reference" href="./bidirectional-sequence.html">Bidirectional Sequence</a>,
29for 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>
30<table border="1" class="table">
31<colgroup>
32<col width="30%" />
33<col width="39%" />
34<col width="30%" />
35</colgroup>
36<thead valign="bottom">
37<tr><th>Expression</th>
38<th>Type</th>
39<th>Complexity</th>
40</tr>
41</thead>
42<tbody valign="top">
43<tr><td><tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a>&lt;s&gt;::type</span></tt></td>
44<td><a class="reference" href="./random-access-iterator.html">Random Access Iterator</a></td>
45<td>Amortized constant time</td>
46</tr>
47<tr><td><tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a>&lt;s&gt;::type</span></tt></td>
48<td><a class="reference" href="./random-access-iterator.html">Random Access Iterator</a></td>
49<td>Amortized constant time</td>
50</tr>
51<tr><td><tt class="literal"><span class="pre"><a href="./at.html" class="identifier">at</a>&lt;s,n&gt;::type</span></tt></td>
52<td>Any type</td>
53<td>Amortized constant time</td>
54</tr>
55</tbody>
56</table>
57</div>
58<div class="section" id="random-expression-semantics">
59<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
60<p>Semantics of an expression is defined only where it differs from, or is not
61defined in <a class="reference" href="./bidirectional-sequence.html">Bidirectional Sequence</a>.</p>
62<table border="1" class="table">
63<colgroup>
64<col width="28%" />
65<col width="72%" />
66</colgroup>
67<thead valign="bottom">
68<tr><th>Expression</th>
69<th>Semantics</th>
70</tr>
71</thead>
72<tbody valign="top">
73<tr><td><tt class="literal"><span class="pre"><a href="./at.html" class="identifier">at</a>&lt;s,n&gt;::type</span></tt></td>
74<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>
75</tr>
76</tbody>
77</table>
78</div>
79<div class="section" id="random-models">
80<h3><a class="subsection-title" href="#models" name="models">Models</a></h3>
81<ul class="simple">
82<li><a class="refentry reference" href="./vector.html"><tt class="refentry literal"><span class="pre">vector</span></tt></a></li>
83<li><a class="refentry reference" href="./range-c.html"><tt class="refentry literal"><span class="pre">range_c</span></tt></a></li>
84</ul>
85</div>
86<div class="section" id="random-see-also">
87<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
88<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>,
89<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>
90<!-- modtime: November 13, 2004 00:40:54 +0000 -->
91<!-- Sequences/Concepts//Extensible Sequence |40 -->
92</div>
93</div>
94
95<div class="footer-separator"></div>
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