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10<title>The MPL Reference Manual: erase_key</title>
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14<table class="header"><tr class="header"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./erase.html" class="navigation-link">Prev</a>&nbsp;<a href="./front.html" class="navigation-link">Next</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group"><a href="./erase.html" class="navigation-link">Back</a>&nbsp;<a href="./front.html" class="navigation-link">Along</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group"><a href="./intrinsic-metafunctions.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="./intrinsic-metafunctions.html" class="navigation-link">Intrinsic Metafunctions</a> / <a href="./erase-key.html" class="navigation-link">erase_key</a></td>
16</tr></table><div class="header-separator"></div>
17<div class="section" id="erase-key">
18<h1><a class="toc-backref" href="./intrinsic-metafunctions.html#id361" name="erase-key">erase_key</a></h1>
19<div class="section" id="intrinsic-erase-synopsis">
20<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
21<pre class="literal-block">
22template&lt;
23      typename AssocSeq
24    , typename Key
25    &gt;
26struct <a href="./erase-key.html" class="identifier">erase_key</a>
27{
28    typedef <em>unspecified</em> type;
29};
30</pre>
31</div>
32<div class="section" id="intrinsic-erase-description">
33<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
34<p>Erases elements associated with the key <tt class="literal"><span class="pre">Key</span></tt> in the <a class="reference" href="./extensible-associative.html">Extensible Associative Sequence</a> 
35<tt class="literal"><span class="pre">AssocSeq</span></tt> .</p>
36</div>
37<div class="section" id="intrinsic-erase-header">
38<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
39<pre class="literal-block">
40#include &lt;<a href="../../../../boost/mpl/erase_key.hpp" class="header">boost/mpl/erase_key.hpp</a>&gt;
41</pre>
42</div>
43<div class="section" id="intrinsic-erase-model-of">
44<h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3>
45<p><a class="reference" href="./tag-dispatched.html">Tag Dispatched Metafunction</a></p>
46</div>
47<div class="section" id="intrinsic-erase-parameters">
48<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
49<table border="1" class="table">
50<colgroup>
51<col width="15%" />
52<col width="36%" />
53<col width="48%" />
54</colgroup>
55<thead valign="bottom">
56<tr><th>Parameter</th>
57<th>Requirement</th>
58<th>Description</th>
59</tr>
60</thead>
61<tbody valign="top">
62<tr><td><tt class="literal"><span class="pre">AssocSeq</span></tt></td>
63<td><a class="reference" href="./extensible-associative.html">Extensible Associative Sequence</a></td>
64<td>A sequence to erase elements from.</td>
65</tr>
66<tr><td><tt class="literal"><span class="pre">Key</span></tt></td>
67<td>Any type</td>
68<td>A key for the elements to be removed.</td>
69</tr>
70</tbody>
71</table>
72</div>
73<div class="section" id="intrinsic-erase-expression-semantics">
74<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
75<p>For any <a class="reference" href="./extensible-associative.html">Extensible Associative Sequence</a> <tt class="literal"><span class="pre">s</span></tt>, and arbitrary type <tt class="literal"><span class="pre">key</span></tt>:</p>
76<pre class="literal-block">
77typedef <a href="./erase-key.html" class="identifier">erase_key</a>&lt;s,key&gt;::type r;
78</pre>
79<table class="field-list" frame="void" rules="none">
80<col class="field-name" />
81<col class="field-body" />
82<tbody valign="top">
83<tr class="field"><th class="field-name">Return type:</th><td class="field-body"><a class="reference" href="./extensible-associative.html">Extensible Associative Sequence</a>.</td>
84</tr>
85<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><tt class="literal"><span class="pre">r</span></tt> is <a class="reference" href="./terminology.html#concept-identical">concept-identical</a> and equivalent to <tt class="literal"><span class="pre">s</span></tt> except that
86<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>.</td>
87</tr>
88<tr class="field"><th class="field-name">Postcondition:</th><td class="field-body"><tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a>&lt;r&gt;::value</span> <span class="pre">==</span> <span class="pre"><a href="./size.html" class="identifier">size</a>&lt;s&gt;::value</span> <span class="pre">-</span> <span class="pre">1</span></tt>.</td>
89</tr>
90</tbody>
91</table>
92</div>
93<div class="section" id="intrinsic-erase-complexity">
94<h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
95<p>Amortized constant time.</p>
96</div>
97<div class="section" id="intrinsic-erase-example">
98<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
99<pre class="literal-block">
100typedef <a href="./map.html" class="identifier">map</a>&lt; <a href="./pair.html" class="identifier">pair</a>&lt;int,unsigned&gt;, <a href="./pair.html" class="identifier">pair</a>&lt;char,long&gt; &gt; m;
101typedef <a href="./erase-key.html" class="identifier">erase_key</a>&lt;m,char&gt;::type m1;
102
103<a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( <a href="./size.html" class="identifier">size</a>&lt;m1&gt;::type::value, ==, 1 );
104<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same&lt; <a href="./at.html" class="identifier">at</a>&lt;m1,char&gt;::type,<a href="./void.html" class="identifier">void_</a> &gt; ));
105<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same&lt; <a href="./at.html" class="identifier">at</a>&lt;m1,int&gt;::type,unsigned > ));
106</pre>
107</div>
108<div class="section" id="intrinsic-erase-see-also">
109<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
110<p><a class="reference" href="./extensible-associative.html">Extensible Associative Sequence</a>, <a class="refentry reference" href="./erase.html"><tt class="refentry literal"><span class="pre">erase</span></tt></a>, <a class="refentry reference" href="./has-key.html"><tt class="refentry literal"><span class="pre">has_key</span></tt></a>, <a class="refentry reference" href="./insert.html"><tt class="refentry literal"><span class="pre">insert</span></tt></a></p>
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