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10<title>The MPL Reference Manual: Bidirectional Sequence</title>
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14<table class="header"><tr class="header"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./forward-sequence.html" class="navigation-link">Prev</a>&nbsp;<a href="./random-access-sequence.html" class="navigation-link">Next</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group"><a href="./forward-sequence.html" class="navigation-link">Back</a>&nbsp;<a href="./random-access-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="./bidirectional-sequence.html" class="navigation-link">Bidirectional Sequence</a></td>
16</tr></table><div class="header-separator"></div>
17<div class="section" id="bidirectional-sequence">
18<h1><a class="toc-backref" href="./concepts.html#id325" name="bidirectional-sequence">Bidirectional Sequence</a></h1>
19<div class="section" id="bidirectional-description">
20<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
21<p>A <a class="reference" href="./bidirectional-sequence.html">Bidirectional Sequence</a> is a <a class="reference" href="./forward-sequence.html">Forward Sequence</a> whose iterators model
22<a class="reference" href="./bidirectional-iterator.html">Bidirectional Iterator</a>.</p>
23</div>
24<div class="section" id="refinement-of">
25<h3><a class="subsection-title" href="#refinement-of" name="refinement-of">Refinement of</a></h3>
26<p><a class="reference" href="./forward-sequence.html">Forward Sequence</a></p>
27</div>
28<div class="section" id="bidirectional-expression-requirements">
29<h3><a class="subsection-title" href="#expression-requirements" name="expression-requirements">Expression requirements</a></h3>
30<p>In addition to the requirements defined in <a class="reference" href="./forward-sequence.html">Forward Sequence</a>,
31for any <a class="reference" href="./bidirectional-sequence.html">Bidirectional Sequence</a> <tt class="literal"><span class="pre">s</span></tt> the following must be met:</p>
32<table border="1" class="table">
33<colgroup>
34<col width="30%" />
35<col width="39%" />
36<col width="30%" />
37</colgroup>
38<thead valign="bottom">
39<tr><th>Expression</th>
40<th>Type</th>
41<th>Complexity</th>
42</tr>
43</thead>
44<tbody valign="top">
45<tr><td><tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a>&lt;s&gt;::type</span></tt></td>
46<td><a class="reference" href="./bidirectional-iterator.html">Bidirectional Iterator</a></td>
47<td>Amortized constant time</td>
48</tr>
49<tr><td><tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a>&lt;s&gt;::type</span></tt></td>
50<td><a class="reference" href="./bidirectional-iterator.html">Bidirectional Iterator</a></td>
51<td>Amortized constant time</td>
52</tr>
53<tr><td><tt class="literal"><span class="pre"><a href="./back.html" class="identifier">back</a>&lt;s&gt;::type</span></tt></td>
54<td>Any type</td>
55<td>Amortized constant time</td>
56</tr>
57</tbody>
58</table>
59</div>
60<div class="section" id="bidirectional-expression-semantics">
61<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
62<p>The semantics of an expression are defined only
63where they differ from, or are not defined in <a class="reference" href="./forward-sequence.html">Forward Sequence</a>.</p>
64<table border="1" class="table">
65<colgroup>
66<col width="28%" />
67<col width="72%" />
68</colgroup>
69<thead valign="bottom">
70<tr><th>Expression</th>
71<th>Semantics</th>
72</tr>
73</thead>
74<tbody valign="top">
75<tr><td><tt class="literal"><span class="pre"><a href="./back.html" class="identifier">back</a>&lt;s&gt;::type</span></tt></td>
76<td>The last element in the sequence; see <a class="refentry reference" href="./back.html"><tt class="refentry literal"><span class="pre">back</span></tt></a>.</td>
77</tr>
78</tbody>
79</table>
80</div>
81<div class="section" id="bidirectional-models">
82<h3><a class="subsection-title" href="#models" name="models">Models</a></h3>
83<ul class="simple">
84<li><a class="refentry reference" href="./vector.html"><tt class="refentry literal"><span class="pre">vector</span></tt></a></li>
85<li><a class="refentry reference" href="./range-c.html"><tt class="refentry literal"><span class="pre">range_c</span></tt></a></li>
86</ul>
87</div>
88<div class="section" id="bidirectional-see-also">
89<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
90<p><a class="reference" href="./sequences.html">Sequences</a>, <a class="reference" href="./forward-sequence.html">Forward Sequence</a>, <a class="reference" href="./random-access-sequence.html">Random Access Sequence</a>, <a class="reference" href="./bidirectional-iterator.html">Bidirectional Iterator</a>, <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="./back.html"><tt class="refentry literal"><span class="pre">back</span></tt></a></p>
91<!-- modtime: November 13, 2004 00:39:57 +0000 -->
92<!-- Sequences/Concepts//Random Access Sequence |30 -->
93</div>
94</div>
95
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