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| 6 | <meta name="generator" content="Docutils 0.7: http://docutils.sourceforge.net/" /> | |
| 7 | <title>The MPL Reference Manual: find_if</title> | |
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| 10 | <body class="docframe refmanual"> | |
| 11 | <table class="header"><tr class="header"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./find.html" class="navigation-link">Prev</a> <a href="./contains.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./find.html" class="navigation-link">Back</a> <a href="./contains.html" class="navigation-link">Along</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./querying-algorithms.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="./algorithms.html" class="navigation-link">Algorithms</a> / <a href="./querying-algorithms.html" class="navigation-link">Querying Algorithms</a> / <a href="./find-if.html" class="navigation-link">find_if</a></td> | |
| 13 | </tr></table><div class="header-separator"></div> | |
| 14 | <div class="section" id="find-if"> | |
| 15 | <h1><a class="toc-backref" href="./querying-algorithms.html#id1476">find_if</a></h1> | |
| 16 | <div class="section" id="id543"> | |
| 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 Pred | |
| 22 | > | |
| 23 | struct <a href="./find-if.html" class="identifier">find_if</a> | |
| 24 | { | |
| 25 | typedef <em>unspecified</em> type; | |
| 26 | }; | |
| 27 | </pre> | |
| 28 | </div> | |
| 29 | <div class="section" id="id544"> | |
| 30 | <h3><a class="subsection-title" href="#description" name="description">Description</a></h3> | |
| 31 | <p>Returns an iterator to the first element in <tt class="literal"><span class="pre">Sequence</span></tt> that satisfies | |
| 32 | the predicate <tt class="literal"><span class="pre">Pred</span></tt>.</p> | |
| 33 | </div> | |
| 34 | <div class="section" id="id545"> | |
| 35 | <h3><a class="subsection-title" href="#header" name="header">Header</a></h3> | |
| 36 | <pre class="literal-block"> | |
| 37 | #include <<a href="../../../../boost/mpl/find_if.hpp" class="header">boost/mpl/find_if.hpp</a>> | |
| 38 | </pre> | |
| 39 | </div> | |
| 40 | <div class="section" id="id546"> | |
| 41 | <h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3> | |
| 42 | <table border="1" class="docutils table"> | |
| 43 | <colgroup> | |
| 44 | <col width="19%" /> | |
| 45 | <col width="38%" /> | |
| 46 | <col width="43%" /> | |
| 47 | </colgroup> | |
| 48 | <thead valign="bottom"> | |
| 49 | <tr><th class="head">Parameter</th> | |
| 50 | <th class="head">Requirement</th> | |
| 51 | <th class="head">Description</th> | |
| 52 | </tr> | |
| 53 | </thead> | |
| 54 | <tbody valign="top"> | |
| 55 | <tr><td><tt class="literal"><span class="pre">Sequence</span></tt></td> | |
| 56 | <td><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a></td> | |
| 57 | <td>A sequence to search in.</td> | |
| 58 | </tr> | |
| 59 | <tr><td><tt class="literal"><span class="pre">Pred</span></tt></td> | |
| 60 | <td>Unary <a class="reference internal" href="./lambda-expression.html">Lambda Expression</a></td> | |
| 61 | <td>A search condition.</td> | |
| 62 | </tr> | |
| 63 | </tbody> | |
| 64 | </table> | |
| 65 | </div> | |
| 66 | <div class="section" id="id547"> | |
| 67 | <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3> | |
| 68 | <p>For any <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a> <tt class="literal"><span class="pre">s</span></tt> and unary <a class="reference internal" href="./lambda-expression.html">Lambda Expression</a> <tt class="literal"><span class="pre">pred</span></tt>:</p> | |
| 69 | <pre class="literal-block"> | |
| 70 | typedef <a href="./find-if.html" class="identifier">find_if</a><s,pred>::type i; | |
| 71 | </pre> | |
| 72 | <table class="docutils field-list" frame="void" rules="none"> | |
| 73 | <col class="field-name" /> | |
| 74 | <col class="field-body" /> | |
| 75 | <tbody valign="top"> | |
| 76 | <tr class="field"><th class="field-name">Return type:</th><td class="field-body"><p class="first"><a class="reference internal" href="./forward-iterator.html">Forward Iterator</a>.</p> | |
| 77 | </td> | |
| 78 | </tr> | |
| 79 | <tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first"><tt class="literal"><span class="pre">i</span></tt> is the first iterator in the range [<tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a><s>::type</span></tt>, <tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a><s>::type</span></tt>) such that</p> | |
| 80 | <pre class="literal-block"> | |
| 81 | <a href="./apply.html" class="identifier">apply</a>< pred,<a href="./deref.html" class="identifier">deref</a><i>::type >::type::value == true | |
| 82 | </pre> | |
| 83 | <p class="last">If no such iterator exists, <tt class="literal"><span class="pre">i</span></tt> is identical to <tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a><s>::type</span></tt>.</p> | |
| 84 | </td> | |
| 85 | </tr> | |
| 86 | </tbody> | |
| 87 | </table> | |
| 88 | </div> | |
| 89 | <div class="section" id="id548"> | |
| 90 | <h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3> | |
| 91 | <p>Linear. At most <tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a><s>::value</span></tt> applications of <tt class="literal"><span class="pre">pred</span></tt>.</p> | |
| 92 | </div> | |
| 93 | <div class="section" id="id549"> | |
| 94 | <h3><a class="subsection-title" href="#example" name="example">Example</a></h3> | |
| 95 | <pre class="literal-block"> | |
| 96 | typedef <a href="./vector.html" class="identifier">vector</a><char,int,unsigned,long,unsigned long> types; | |
| 97 | typedef <a href="./find-if.html" class="identifier">find_if</a><types, is_same<<a href="./placeholders.html" class="identifier">_1</a>,unsigned> >::type iter; | |
| 98 | ||
| 99 | <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same< <a href="./deref.html" class="identifier">deref</a><iter>::type, unsigned > )); | |
| 100 | <a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( iter::pos::value, ==, 2 ); | |
| 101 | </pre> | |
| 102 | </div> | |
| 103 | <div class="section" id="id550"> | |
| 104 | <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3> | |
| 105 | <p><a class="reference internal" href="./querying-algorithms.html">Querying Algorithms</a>, <a class="reference internal" href="./find.html">find</a>, <a class="reference internal" href="./count-if.html">count_if</a>, <a class="reference internal" href="./lower-bound.html">lower_bound</a></p> | |
| 106 | <!-- Algorithms/Querying Algorithms//contains |30 --> | |
| 107 | </div> | |
| 108 | </div> | |
| 109 | ||
| 110 | <div class="footer-separator"></div> | |
| 111 | <table class="footer"><tr class="footer"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./find.html" class="navigation-link">Prev</a> <a href="./contains.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./find.html" class="navigation-link">Back</a> <a href="./contains.html" class="navigation-link">Along</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./querying-algorithms.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> | |
| 112 | <td><div class="copyright-footer"><div class="copyright">Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams</div> | |
| 113 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
| 114 | 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> | |
| 115 | </html> |