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7<title>The MPL Reference Manual: Extensible Associative 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="./associative-sequence.html" class="navigation-link">Prev</a>&nbsp;<a href="./integral-sequence-wrapper.html" class="navigation-link">Next</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group"><a href="./associative-sequence.html" class="navigation-link">Back</a>&nbsp;<a href="./integral-sequence-wrapper.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="./extensible-associative.html" class="navigation-link">Extensible Associative Sequence</a></td>
13</tr></table><div class="header-separator"></div>
14<div class="section" id="extensible-associative">
15<h1><a class="toc-backref" href="./concepts.html#id331" name="extensible-associative">Extensible Associative Sequence</a></h1>
16<div class="section" id="concepts-extensible-description">
17<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
18<p>An <a class="reference" href="./extensible-associative.html">Extensible Associative Sequence</a> is an <a class="reference" href="./associative-sequence.html">Associative Sequence</a> that supports
19insertion and removal of elements. In contrast to <a class="reference" href="./extensible-sequence.html">Extensible Sequence</a>,
20<a class="reference" href="./extensible-associative.html">Extensible Associative Sequence</a> does not provide a mechanism for
21inserting an element at a specific position.</p>
22</div>
23<div class="section" id="concepts-extensible-expression-requirements">
24<h3><a class="subsection-title" href="#expression-requirements" name="expression-requirements">Expression requirements</a></h3>
25<p>In the following table and subsequent specifications, <tt class="literal"><span class="pre">s</span></tt> is an <a class="reference" href="./associative-sequence.html">Associative Sequence</a>,
26<tt class="literal"><span class="pre">pos</span></tt> is an iterator into <tt class="literal"><span class="pre">s</span></tt>, and <tt class="literal"><span class="pre">x</span></tt> and <tt class="literal"><span class="pre">k</span></tt> are arbitrary types.</p>
27<p>In addition to the <a class="reference" href="./associative-sequence.html">Associative Sequence</a> requirements, the following must be met:</p>
28<table border="1" class="table">
29<colgroup>
30<col width="32%" />
31<col width="40%" />
32<col width="28%" />
33</colgroup>
34<thead valign="bottom">
35<tr><th>Expression</th>
36<th>Type</th>
37<th>Complexity</th>
38</tr>
39</thead>
40<tbody valign="top">
41<tr><td><tt class="literal"><span class="pre"><a href="./insert.html" class="identifier">insert</a>&lt;s,x&gt;::type</span></tt></td>
42<td><a class="reference" href="./extensible-associative.html">Extensible Associative Sequence</a></td>
43<td>Amortized constant time</td>
44</tr>
45<tr><td><tt class="literal"><span class="pre"><a href="./insert.html" class="identifier">insert</a>&lt;s,pos,x&gt;::type</span></tt></td>
46<td><a class="reference" href="./extensible-associative.html">Extensible Associative Sequence</a></td>
47<td>Amortized constant time</td>
48</tr>
49<tr><td><tt class="literal"><span class="pre"><a href="./erase-key.html" class="identifier">erase_key</a>&lt;s,k&gt;::type</span></tt></td>
50<td><a class="reference" href="./extensible-associative.html">Extensible Associative Sequence</a></td>
51<td>Amortized constant time</td>
52</tr>
53<tr><td><tt class="literal"><span class="pre"><a href="./erase.html" class="identifier">erase</a>&lt;s,pos&gt;::type</span></tt></td>
54<td><a class="reference" href="./extensible-associative.html">Extensible Associative Sequence</a></td>
55<td>Amortized constant time</td>
56</tr>
57<tr><td><tt class="literal"><span class="pre"><a href="./clear.html" class="identifier">clear</a>&lt;s&gt;::type</span></tt></td>
58<td><a class="reference" href="./extensible-associative.html">Extensible Associative Sequence</a></td>
59<td>Amortized constant time</td>
60</tr>
61</tbody>
62</table>
63</div>
64<div class="section" id="concepts-extensible-expression-semantics">
65<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
66<p>The semantics of an expression are defined only
67where they differ from, or are not defined in <a class="reference" href="./associative-sequence.html">Associative Sequence</a>.</p>
68<table border="1" class="table">
69<colgroup>
70<col width="32%" />
71<col width="68%" />
72</colgroup>
73<thead valign="bottom">
74<tr><th>Expression</th>
75<th>Semantics</th>
76</tr>
77</thead>
78<tbody valign="top">
79<tr><td><tt class="literal"><span class="pre"><a href="./insert.html" class="identifier">insert</a>&lt;s,x&gt;::type</span></tt></td>
80<td><p class="first">Inserts <tt class="literal"><span class="pre">x</span></tt> into <tt class="literal"><span class="pre">s</span></tt>; the resulting sequence <tt class="literal"><span class="pre">r</span></tt> is
81equivalent to <tt class="literal"><span class="pre">s</span></tt> except that</p>
82<pre class="literal-block">
83<a href="./at.html" class="identifier">at</a>&lt; r, <a href="./key-type.html" class="identifier">key_type</a>&lt;s,x&gt;::type &gt;::type
84</pre>
85<p class="last">is identical to <tt class="literal"><span class="pre"><a href="./value-type.html" class="identifier">value_type</a>&lt;s,x&gt;::type</span></tt>; see <a class="refentry reference" href="./insert.html"><tt class="refentry literal"><span class="pre">insert</span></tt></a>.</p>
86</td>
87</tr>
88<tr><td><tt class="literal"><span class="pre"><a href="./insert.html" class="identifier">insert</a>&lt;s,pos,x&gt;::type</span></tt></td>
89<td>Equivalent to <tt class="literal"><span class="pre"><a href="./insert.html" class="identifier">insert</a>&lt;s,x&gt;::type</span></tt>; <tt class="literal"><span class="pre">pos</span></tt> is ignored;
90see <a class="refentry reference" href="./insert.html"><tt class="refentry literal"><span class="pre">insert</span></tt></a>.</td>
91</tr>
92<tr><td><tt class="literal"><span class="pre"><a href="./erase-key.html" class="identifier">erase_key</a>&lt;s,k&gt;::type</span></tt></td>
93<td>Erases elements in <tt class="literal"><span class="pre">s</span></tt> associated with the key <tt class="literal"><span class="pre">k</span></tt>;
94the resulting sequence <tt class="literal"><span class="pre">r</span></tt> is equivalent to <tt class="literal"><span class="pre">s</span></tt> except
95that <tt class="literal"><span class="pre"><a href="./has-key.html" class="identifier">has_key</a>&lt;r,k&gt;::value</span> <span class="pre">==</span> <span class="pre">false</span></tt>; see <a class="refentry reference" href="./erase-key.html"><tt class="refentry literal"><span class="pre">erase_key</span></tt></a>.</td>
96</tr>
97<tr><td><tt class="literal"><span class="pre"><a href="./erase.html" class="identifier">erase</a>&lt;s,pos&gt;::type</span></tt></td>
98<td>Erases the element at a specific position; equivalent to
99<tt class="literal"><span class="pre"><a href="./erase-key.html" class="identifier">erase_key</a>&lt;s,</span> <span class="pre"><a href="./deref.html" class="identifier">deref</a>&lt;pos&gt;::type</span> <span class="pre">&gt;::type</span></tt>; see <a class="refentry reference" href="./erase.html"><tt class="refentry literal"><span class="pre">erase</span></tt></a>.</td>
100</tr>
101<tr><td><tt class="literal"><span class="pre"><a href="./clear.html" class="identifier">clear</a>&lt;s&gt;::type</span></tt></td>
102<td>An empty sequence concept-identical to <tt class="literal"><span class="pre">s</span></tt>; see
103<a class="refentry reference" href="./clear.html"><tt class="refentry literal"><span class="pre">clear</span></tt></a>.</td>
104</tr>
105</tbody>
106</table>
107<!-- Invariants
108- - - - - - - - - -
109
110For any extensible associative sequence ``s`` the following invariants always hold:  -->
111</div>
112<div class="section" id="concepts-extensible-models">
113<h3><a class="subsection-title" href="#models" name="models">Models</a></h3>
114<ul class="simple">
115<li><a class="refentry reference" href="./set.html"><tt class="refentry literal"><span class="pre">set</span></tt></a></li>
116<li><a class="refentry reference" href="./map.html"><tt class="refentry literal"><span class="pre">map</span></tt></a></li>
117</ul>
118<!-- * |multiset| -->
119</div>
120<div class="section" id="concepts-extensible-see-also">
121<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
122<p><a class="reference" href="./sequences.html">Sequences</a>, <a class="reference" href="./associative-sequence.html">Associative Sequence</a>, <a class="refentry reference" href="./insert.html"><tt class="refentry literal"><span class="pre">insert</span></tt></a>, <a class="refentry reference" href="./erase.html"><tt class="refentry literal"><span class="pre">erase</span></tt></a>, <a class="refentry reference" href="./clear.html"><tt class="refentry literal"><span class="pre">clear</span></tt></a></p>
123<!-- modtime: November 13, 2004 00:49:10 +0000 -->
124<!-- Sequences/Concepts//Integral Sequence Wrapper |90 -->
125</div>
126</div>
127
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