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| 6 | <meta name="generator" content="Docutils 0.7: http://docutils.sourceforge.net/" /> | |
| 7 | <title>The MPL Reference Manual: has_key</title> | |
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| 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="./front.html" class="navigation-link">Prev</a> <a href="./insert.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./front.html" class="navigation-link">Back</a> <a href="./insert.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="./has-key.html" class="navigation-link">has_key</a></td> | |
| 13 | </tr></table><div class="header-separator"></div> | |
| 14 | <div class="section" id="has-key"> | |
| 15 | <h1><a class="toc-backref" href="./intrinsic-metafunctions.html#id1435">has_key</a></h1> | |
| 16 | <div class="section" id="id265"> | |
| 17 | <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3> | |
| 18 | <pre class="literal-block"> | |
| 19 | template< | |
| 20 | typename Sequence | |
| 21 | , typename Key | |
| 22 | > | |
| 23 | struct <a href="./has-key.html" class="identifier">has_key</a> | |
| 24 | { | |
| 25 | typedef <em>unspecified</em> type; | |
| 26 | }; | |
| 27 | </pre> | |
| 28 | </div> | |
| 29 | <div class="section" id="id266"> | |
| 30 | <h3><a class="subsection-title" href="#description" name="description">Description</a></h3> | |
| 31 | <p>Returns a true-valued <a class="reference internal" href="./integral-constant.html">Integral Constant</a> if <tt class="literal"><span class="pre">Sequence</span></tt> contains an element | |
| 32 | with key <tt class="literal"><span class="pre">Key</span></tt>.</p> | |
| 33 | </div> | |
| 34 | <div class="section" id="id267"> | |
| 35 | <h3><a class="subsection-title" href="#header" name="header">Header</a></h3> | |
| 36 | <pre class="literal-block"> | |
| 37 | #include <<a href="../../../../boost/mpl/has_key.hpp" class="header">boost/mpl/has_key.hpp</a>> | |
| 38 | </pre> | |
| 39 | </div> | |
| 40 | <div class="section" id="id268"> | |
| 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="id269"> | |
| 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="17%" /> | |
| 49 | <col width="30%" /> | |
| 50 | <col width="53%" /> | |
| 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">Sequence</span></tt></td> | |
| 60 | <td><a class="reference internal" href="./associative-sequence.html">Associative Sequence</a></td> | |
| 61 | <td>A sequence to query.</td> | |
| 62 | </tr> | |
| 63 | <tr><td><tt class="literal"><span class="pre">Key</span></tt></td> | |
| 64 | <td>Any type</td> | |
| 65 | <td>The queried key.</td> | |
| 66 | </tr> | |
| 67 | </tbody> | |
| 68 | </table> | |
| 69 | </div> | |
| 70 | <div class="section" id="id270"> | |
| 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="./associative-sequence.html">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="./has-key.html" class="identifier">has_key</a><s,key>::type c; | |
| 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">Boolean <a class="reference internal" href="./integral-constant.html">Integral Constant</a>.</td> | |
| 81 | </tr> | |
| 82 | <tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><tt class="literal"><span class="pre">c::value</span> <span class="pre">==</span> <span class="pre">true</span></tt> if <tt class="literal"><span class="pre">key</span></tt> is in <tt class="literal"><span class="pre">s</span></tt>'s set of keys; otherwise | |
| 83 | <tt class="literal"><span class="pre">c::value</span> <span class="pre">==</span> <span class="pre">false</span></tt>.</td> | |
| 84 | </tr> | |
| 85 | </tbody> | |
| 86 | </table> | |
| 87 | </div> | |
| 88 | <div class="section" id="id271"> | |
| 89 | <h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3> | |
| 90 | <p>Amortized constant time.</p> | |
| 91 | </div> | |
| 92 | <div class="section" id="id272"> | |
| 93 | <h3><a class="subsection-title" href="#example" name="example">Example</a></h3> | |
| 94 | <pre class="literal-block"> | |
| 95 | 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; | |
| 96 | <a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( <a href="./has-key.html" class="identifier">has_key</a><m,long> )); | |
| 97 | ||
| 98 | typedef <a href="./insert.html" class="identifier">insert</a>< m, <a href="./pair.html" class="identifier">pair</a><long,unsigned long> > m1; | |
| 99 | <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( <a href="./has-key.html" class="identifier">has_key</a><m1,long> )); | |
| 100 | </pre> | |
| 101 | </div> | |
| 102 | <div class="section" id="id273"> | |
| 103 | <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3> | |
| 104 | <p><a class="reference internal" href="./associative-sequence.html">Associative Sequence</a>, <a class="reference internal" href="./count.html">count</a>, <a class="reference internal" href="./insert.html">insert</a>, <a class="reference internal" href="./erase-key.html">erase_key</a></p> | |
| 105 | <!-- Sequences/Intrinsic Metafunctions//insert --> | |
| 106 | </div> | |
| 107 | </div> | |
| 108 | ||
| 109 | <div class="footer-separator"></div> | |
| 110 | <table class="footer"><tr class="footer"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./front.html" class="navigation-link">Prev</a> <a href="./insert.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./front.html" class="navigation-link">Back</a> <a href="./insert.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> | |
| 111 | <td><div class="copyright-footer"><div class="copyright">Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams</div> | |
| 112 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
| 113 | 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> | |
| 114 | </html> |