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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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6 | <meta name="generator" content="Docutils 0.7: http://docutils.sourceforge.net/" /> | |
7 | <title>The MPL Reference Manual: erase_key</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="./erase.html" class="navigation-link">Prev</a> <a href="./front.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./erase.html" class="navigation-link">Back</a> <a href="./front.html" class="navigation-link">Along</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./intrinsic-metafunctions.html" class="navigation-link">Up</a> <a href="../refmanual.html" class="navigation-link">Home</a></span><span class="navigation-group-separator"> | </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="./intrinsic-metafunctions.html" class="navigation-link">Intrinsic Metafunctions</a> / <a href="./erase-key.html" class="navigation-link">erase_key</a></td> | |
13 | </tr></table><div class="header-separator"></div> | |
14 | <div class="section" id="erase-key"> | |
15 | <h1><a class="toc-backref" href="./intrinsic-metafunctions.html#id1433">erase_key</a></h1> | |
16 | <div class="section" id="id247"> | |
17 | <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3> | |
18 | <pre class="literal-block"> | |
19 | template< | |
20 | typename AssocSeq | |
21 | , typename Key | |
22 | > | |
23 | struct <a href="./erase-key.html" class="identifier">erase_key</a> | |
24 | { | |
25 | typedef <em>unspecified</em> type; | |
26 | }; | |
27 | </pre> | |
28 | </div> | |
29 | <div class="section" id="id248"> | |
30 | <h3><a class="subsection-title" href="#description" name="description">Description</a></h3> | |
31 | <p>Erases elements associated with the key <tt class="literal"><span class="pre">Key</span></tt> in the <a class="reference internal" href="./extensible-associative-sequence.html">Extensible Associative Sequence</a> | |
32 | <tt class="literal"><span class="pre">AssocSeq</span></tt> .</p> | |
33 | </div> | |
34 | <div class="section" id="id249"> | |
35 | <h3><a class="subsection-title" href="#header" name="header">Header</a></h3> | |
36 | <pre class="literal-block"> | |
37 | #include <<a href="../../../../boost/mpl/erase_key.hpp" class="header">boost/mpl/erase_key.hpp</a>> | |
38 | </pre> | |
39 | </div> | |
40 | <div class="section" id="id250"> | |
41 | <h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3> | |
42 | <p><a class="reference internal" href="./tag-dispatched-metafunction.html">Tag Dispatched Metafunction</a></p> | |
43 | </div> | |
44 | <div class="section" id="id251"> | |
45 | <h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3> | |
46 | <table border="1" class="docutils table"> | |
47 | <colgroup> | |
48 | <col width="15%" /> | |
49 | <col width="36%" /> | |
50 | <col width="48%" /> | |
51 | </colgroup> | |
52 | <thead valign="bottom"> | |
53 | <tr><th class="head">Parameter</th> | |
54 | <th class="head">Requirement</th> | |
55 | <th class="head">Description</th> | |
56 | </tr> | |
57 | </thead> | |
58 | <tbody valign="top"> | |
59 | <tr><td><tt class="literal"><span class="pre">AssocSeq</span></tt></td> | |
60 | <td><a class="reference internal" href="./extensible-associative-sequence.html">Extensible Associative Sequence</a></td> | |
61 | <td>A sequence to erase elements from.</td> | |
62 | </tr> | |
63 | <tr><td><tt class="literal"><span class="pre">Key</span></tt></td> | |
64 | <td>Any type</td> | |
65 | <td>A key for the elements to be removed.</td> | |
66 | </tr> | |
67 | </tbody> | |
68 | </table> | |
69 | </div> | |
70 | <div class="section" id="id252"> | |
71 | <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3> | |
72 | <p>For any <a class="reference internal" href="./extensible-associative-sequence.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> | |
73 | <pre class="literal-block"> | |
74 | typedef <a href="./erase-key.html" class="identifier">erase_key</a><s,key>::type r; | |
75 | </pre> | |
76 | <table class="docutils field-list" frame="void" rules="none"> | |
77 | <col class="field-name" /> | |
78 | <col class="field-body" /> | |
79 | <tbody valign="top"> | |
80 | <tr class="field"><th class="field-name">Return type:</th><td class="field-body"><a class="reference internal" href="./extensible-associative-sequence.html">Extensible Associative Sequence</a>.</td> | |
81 | </tr> | |
82 | <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 internal" href="./terminology.html#concept-identical">concept-identical</a> and equivalent to <tt class="literal"><span class="pre">s</span></tt> except that | |
83 | <tt class="literal"><span class="pre"><a href="./has-key.html" class="identifier">has_key</a><r,k>::value</span> <span class="pre">==</span> <span class="pre">false</span></tt>.</td> | |
84 | </tr> | |
85 | <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><r>::value</span> <span class="pre">==</span> <span class="pre"><a href="./size.html" class="identifier">size</a><s>::value</span> <span class="pre">-</span> <span class="pre">1</span></tt>.</td> | |
86 | </tr> | |
87 | </tbody> | |
88 | </table> | |
89 | </div> | |
90 | <div class="section" id="id253"> | |
91 | <h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3> | |
92 | <p>Amortized constant time.</p> | |
93 | </div> | |
94 | <div class="section" id="id254"> | |
95 | <h3><a class="subsection-title" href="#example" name="example">Example</a></h3> | |
96 | <pre class="literal-block"> | |
97 | typedef <a href="./map.html" class="identifier">map</a>< <a href="./pair.html" class="identifier">pair</a><int,unsigned>, <a href="./pair.html" class="identifier">pair</a><char,long> > m; | |
98 | typedef <a href="./erase-key.html" class="identifier">erase_key</a><m,char>::type m1; | |
99 | ||
100 | <a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( <a href="./size.html" class="identifier">size</a><m1>::type::value, ==, 1 ); | |
101 | <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same< <a href="./at.html" class="identifier">at</a><m1,char>::type,<a href="./void.html" class="identifier">void_</a> > )); | |
102 | <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same< <a href="./at.html" class="identifier">at</a><m1,int>::type,unsigned > )); | |
103 | </pre> | |
104 | </div> | |
105 | <div class="section" id="id255"> | |
106 | <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3> | |
107 | <p><a class="reference internal" href="./extensible-associative-sequence.html">Extensible Associative Sequence</a>, <a class="reference internal" href="./erase.html">erase</a>, <a class="reference internal" href="./has-key.html">has_key</a>, <a class="reference internal" href="./insert.html">insert</a></p> | |
108 | <!-- Sequences/Intrinsic Metafunctions//front --> | |
109 | </div> | |
110 | </div> | |
111 | ||
112 | <div class="footer-separator"></div> | |
113 | <table class="footer"><tr class="footer"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./erase.html" class="navigation-link">Prev</a> <a href="./front.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./erase.html" class="navigation-link">Back</a> <a href="./front.html" class="navigation-link">Along</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./intrinsic-metafunctions.html" class="navigation-link">Up</a> <a href="../refmanual.html" class="navigation-link">Home</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./refmanual_toc.html" class="navigation-link">Full TOC</a></span></td> | |
114 | <td><div class="copyright-footer"><div class="copyright">Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams</div> | |
115 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
116 | file LICENSE_1_0.txt or copy at <a class="reference external" href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)</div></td></tr></table></body> | |
117 | </html> |