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| <title>The MPL Reference Manual: erase_key</title> |
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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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| <div class="section" id="erase-key"> |
| <h1><a class="toc-backref" href="./intrinsic-metafunctions.html#id1433">erase_key</a></h1> |
| <div class="section" id="id247"> |
| <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3> |
| <pre class="literal-block"> |
| template< |
| typename AssocSeq |
| , typename Key |
| > |
| struct <a href="./erase-key.html" class="identifier">erase_key</a> |
| { |
| typedef <em>unspecified</em> type; |
| }; |
| </pre> |
| </div> |
| <div class="section" id="id248"> |
| <h3><a class="subsection-title" href="#description" name="description">Description</a></h3> |
| <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> |
| <tt class="literal"><span class="pre">AssocSeq</span></tt> .</p> |
| </div> |
| <div class="section" id="id249"> |
| <h3><a class="subsection-title" href="#header" name="header">Header</a></h3> |
| <pre class="literal-block"> |
| #include <<a href="../../../../boost/mpl/erase_key.hpp" class="header">boost/mpl/erase_key.hpp</a>> |
| </pre> |
| </div> |
| <div class="section" id="id250"> |
| <h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3> |
| <p><a class="reference internal" href="./tag-dispatched-metafunction.html">Tag Dispatched Metafunction</a></p> |
| </div> |
| <div class="section" id="id251"> |
| <h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3> |
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| <col width="36%" /> |
| <col width="48%" /> |
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| <tr><th class="head">Parameter</th> |
| <th class="head">Requirement</th> |
| <th class="head">Description</th> |
| </tr> |
| </thead> |
| <tbody valign="top"> |
| <tr><td><tt class="literal"><span class="pre">AssocSeq</span></tt></td> |
| <td><a class="reference internal" href="./extensible-associative-sequence.html">Extensible Associative Sequence</a></td> |
| <td>A sequence to erase elements from.</td> |
| </tr> |
| <tr><td><tt class="literal"><span class="pre">Key</span></tt></td> |
| <td>Any type</td> |
| <td>A key for the elements to be removed.</td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <div class="section" id="id252"> |
| <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3> |
| <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> |
| <pre class="literal-block"> |
| typedef <a href="./erase-key.html" class="identifier">erase_key</a><s,key>::type r; |
| </pre> |
| <table class="docutils field-list" frame="void" rules="none"> |
| <col class="field-name" /> |
| <col class="field-body" /> |
| <tbody valign="top"> |
| <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> |
| </tr> |
| <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 |
| <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> |
| </tr> |
| <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> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <div class="section" id="id253"> |
| <h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3> |
| <p>Amortized constant time.</p> |
| </div> |
| <div class="section" id="id254"> |
| <h3><a class="subsection-title" href="#example" name="example">Example</a></h3> |
| <pre class="literal-block"> |
| 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; |
| typedef <a href="./erase-key.html" class="identifier">erase_key</a><m,char>::type m1; |
| |
| <a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( <a href="./size.html" class="identifier">size</a><m1>::type::value, ==, 1 ); |
| <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> > )); |
| <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same< <a href="./at.html" class="identifier">at</a><m1,int>::type,unsigned > )); |
| </pre> |
| </div> |
| <div class="section" id="id255"> |
| <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3> |
| <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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