118 lines
8.5 KiB
HTML
118 lines
8.5 KiB
HTML
<?xml version="1.0" encoding="utf-8" ?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="generator" content="Docutils 0.7: http://docutils.sourceforge.net/" />
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<title>The MPL Reference Manual: erase_key</title>
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<link rel="stylesheet" href="../style.css" type="text/css" />
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</head>
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<body class="docframe refmanual">
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<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>
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<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>
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</tr></table><div class="header-separator"></div>
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<div class="section" id="erase-key">
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<h1><a class="toc-backref" href="./intrinsic-metafunctions.html#id1433">erase_key</a></h1>
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<div class="section" id="id247">
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<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
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<pre class="literal-block">
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template<
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typename AssocSeq
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, typename Key
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>
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struct <a href="./erase-key.html" class="identifier">erase_key</a>
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{
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typedef <em>unspecified</em> type;
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};
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</pre>
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</div>
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<div class="section" id="id248">
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<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
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<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>
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<tt class="literal"><span class="pre">AssocSeq</span></tt> .</p>
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</div>
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<div class="section" id="id249">
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<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
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<pre class="literal-block">
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#include <<a href="../../../../boost/mpl/erase_key.hpp" class="header">boost/mpl/erase_key.hpp</a>>
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</pre>
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</div>
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<div class="section" id="id250">
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<h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3>
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<p><a class="reference internal" href="./tag-dispatched-metafunction.html">Tag Dispatched Metafunction</a></p>
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</div>
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<div class="section" id="id251">
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<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
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<table border="1" class="docutils table">
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<colgroup>
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<col width="15%" />
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<col width="36%" />
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<col width="48%" />
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</colgroup>
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<thead valign="bottom">
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<tr><th class="head">Parameter</th>
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<th class="head">Requirement</th>
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<th class="head">Description</th>
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</tr>
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</thead>
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<tbody valign="top">
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<tr><td><tt class="literal"><span class="pre">AssocSeq</span></tt></td>
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<td><a class="reference internal" href="./extensible-associative-sequence.html">Extensible Associative Sequence</a></td>
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<td>A sequence to erase elements from.</td>
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</tr>
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<tr><td><tt class="literal"><span class="pre">Key</span></tt></td>
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<td>Any type</td>
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<td>A key for the elements to be removed.</td>
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</tr>
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</tbody>
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</table>
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</div>
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<div class="section" id="id252">
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<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
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<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>
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<pre class="literal-block">
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typedef <a href="./erase-key.html" class="identifier">erase_key</a><s,key>::type r;
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</pre>
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<table class="docutils field-list" frame="void" rules="none">
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<col class="field-name" />
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<col class="field-body" />
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<tbody valign="top">
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<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>
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</tr>
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<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
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<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>
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</tr>
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<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>
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</tr>
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</tbody>
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</table>
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</div>
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<div class="section" id="id253">
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<h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
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<p>Amortized constant time.</p>
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</div>
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<div class="section" id="id254">
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<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
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<pre class="literal-block">
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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;
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typedef <a href="./erase-key.html" class="identifier">erase_key</a><m,char>::type m1;
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<a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( <a href="./size.html" class="identifier">size</a><m1>::type::value, ==, 1 );
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<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> > ));
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<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same< <a href="./at.html" class="identifier">at</a><m1,int>::type,unsigned > ));
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</pre>
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</div>
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<div class="section" id="id255">
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<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
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<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>
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<!-- Sequences/Intrinsic Metafunctions//front -->
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<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>
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<td><div class="copyright-footer"><div class="copyright">Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams</div>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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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>
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