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1<?xml version="1.0" encoding="utf-8" ?>
2<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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5<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
6<meta name="generator" content="Docutils 0.3.6: http://docutils.sourceforge.net/" />
7<title>The MPL Reference Manual: Front Extensible Sequence</title>
8<link rel="stylesheet" href="../style.css" type="text/css" />
9</head>
10<body class="docframe refmanual">
11<table class="header"><tr class="header"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./extensible-sequence.html" class="navigation-link">Prev</a>&nbsp;<a href="./back-extensible-sequence.html" class="navigation-link">Next</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group"><a href="./extensible-sequence.html" class="navigation-link">Back</a>&nbsp;<a href="./back-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="./front-extensible-sequence.html" class="navigation-link">Front Extensible Sequence</a></td>
13</tr></table><div class="header-separator"></div>
14<div class="section" id="front-extensible-sequence">
15<h1><a class="toc-backref" href="./concepts.html#id328" name="front-extensible-sequence">Front Extensible Sequence</a></h1>
16<div class="section" id="front-description">
17<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
18<p>A <a class="reference" href="./front-extensible-sequence.html">Front Extensible Sequence</a> is an <a class="reference" href="./extensible-sequence.html">Extensible Sequence</a> that supports amortized constant
19time insertion and removal operations at the beginning.</p>
20</div>
21<div class="section" id="front-refinement-of">
22<h3><a class="subsection-title" href="#refinement-of" name="refinement-of">Refinement of</a></h3>
23<p><a class="reference" href="./extensible-sequence.html">Extensible Sequence</a></p>
24</div>
25<div class="section" id="front-expression-requirements">
26<h3><a class="subsection-title" href="#expression-requirements" name="expression-requirements">Expression requirements</a></h3>
27<p>In addition to the requirements defined in <a class="reference" href="./extensible-sequence.html">Extensible Sequence</a>,
28for any <a class="reference" href="./back-extensible-sequence.html">Back Extensible Sequence</a> <tt class="literal"><span class="pre">s</span></tt> the following must be met:</p>
29<table border="1" class="table">
30<colgroup>
31<col width="35%" />
32<col width="35%" />
33<col width="30%" />
34</colgroup>
35<thead valign="bottom">
36<tr><th>Expression</th>
37<th>Type</th>
38<th>Complexity</th>
39</tr>
40</thead>
41<tbody valign="top">
42<tr><td><tt class="literal"><span class="pre"><a href="./push-front.html" class="identifier">push_front</a>&lt;s,x&gt;::type</span></tt></td>
43<td><a class="reference" href="./front-extensible-sequence.html">Front Extensible Sequence</a></td>
44<td>Amortized constant time</td>
45</tr>
46<tr><td><tt class="literal"><span class="pre"><a href="./pop-front.html" class="identifier">pop_front</a>&lt;s&gt;::type</span></tt></td>
47<td><a class="reference" href="./front-extensible-sequence.html">Front Extensible Sequence</a></td>
48<td>Amortized constant time</td>
49</tr>
50<tr><td><tt class="literal"><span class="pre"><a href="./front.html" class="identifier">front</a>&lt;s&gt;::type</span></tt></td>
51<td>Any type</td>
52<td>Amortized constant time</td>
53</tr>
54</tbody>
55</table>
56</div>
57<div class="section" id="front-expression-semantics">
58<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
59<p>The semantics of an expression are defined only
60where they differ from, or are not defined in <a class="reference" href="./extensible-sequence.html">Extensible Sequence</a>.</p>
61<table border="1" class="table">
62<colgroup>
63<col width="34%" />
64<col width="66%" />
65</colgroup>
66<thead valign="bottom">
67<tr><th>Expression</th>
68<th>Semantics</th>
69</tr>
70</thead>
71<tbody valign="top">
72<tr><td><tt class="literal"><span class="pre"><a href="./push-front.html" class="identifier">push_front</a>&lt;s,x&gt;::type</span></tt></td>
73<td>Equivalent to <tt class="literal"><span class="pre"><a href="./insert.html" class="identifier">insert</a>&lt;s,<a href="./begin.html" class="identifier">begin</a>&lt;s&gt;::type,x&gt;::type</span></tt>;
74see <a class="refentry reference" href="./push-front.html"><tt class="refentry literal"><span class="pre">push_front</span></tt></a>.</td>
75</tr>
76<tr><td><tt class="literal"><span class="pre"><a href="./pop-front.html" class="identifier">pop_front</a>&lt;v&gt;::type</span></tt></td>
77<td>Equivalent to <tt class="literal"><span class="pre"><a href="./erase.html" class="identifier">erase</a>&lt;s,<a href="./begin.html" class="identifier">begin</a>&lt;s&gt;::type&gt;::type</span></tt>;
78see <a class="refentry reference" href="./pop-front.html"><tt class="refentry literal"><span class="pre">pop_front</span></tt></a>.</td>
79</tr>
80<tr><td><tt class="literal"><span class="pre"><a href="./front.html" class="identifier">front</a>&lt;s&gt;::type</span></tt></td>
81<td>The first element in the sequence; see <a class="refentry reference" href="./front.html"><tt class="refentry literal"><span class="pre">front</span></tt></a>.</td>
82</tr>
83</tbody>
84</table>
85</div>
86<div class="section" id="front-models">
87<h3><a class="subsection-title" href="#models" name="models">Models</a></h3>
88<ul class="simple">
89<li><a class="refentry reference" href="./vector.html"><tt class="refentry literal"><span class="pre">vector</span></tt></a></li>
90<li><a class="refentry reference" href="./list.html"><tt class="refentry literal"><span class="pre">list</span></tt></a></li>
91</ul>
92</div>
93<div class="section" id="front-see-also">
94<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
95<p><a class="reference" href="./sequences.html">Sequences</a>, <a class="reference" href="./extensible-sequence.html">Extensible Sequence</a>, <a class="reference" href="./back-extensible-sequence.html">Back Extensible Sequence</a>, <a class="refentry reference" href="./push-front.html"><tt class="refentry literal"><span class="pre">push_front</span></tt></a>, <a class="refentry reference" href="./pop-front.html"><tt class="refentry literal"><span class="pre">pop_front</span></tt></a>, <a class="refentry reference" href="./front.html"><tt class="refentry literal"><span class="pre">front</span></tt></a></p>
96<!-- modtime: November 10, 2004 04:40:54 +0000 -->
97<!-- Sequences/Concepts//Back Extensible Sequence |60 -->
98</div>
99</div>
100
101<div class="footer-separator"></div>
102<table class="footer"><tr class="footer"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./extensible-sequence.html" class="navigation-link">Prev</a>&nbsp;<a href="./back-extensible-sequence.html" class="navigation-link">Next</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group"><a href="./extensible-sequence.html" class="navigation-link">Back</a>&nbsp;<a href="./back-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>
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104</html>
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