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1 | <?xml version="1.0" encoding="utf-8" ?> |
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| 6 | <meta name="generator" content="Docutils 0.7: http://docutils.sourceforge.net/" /> | |
| 7 | <title>The MPL Reference Manual: copy_if</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="./copy.html" class="navigation-link">Prev</a> <a href="./transform.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./copy.html" class="navigation-link">Back</a> <a href="./transform.html" class="navigation-link">Along</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./transformation-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="./transformation-algorithms.html" class="navigation-link">Transformation Algorithms</a> / <a href="./copy-if.html" class="navigation-link">copy_if</a></td> | |
| 13 | </tr></table><div class="header-separator"></div> | |
| 14 | <div class="section" id="copy-if"> | |
| 15 | <h1><a class="toc-backref" href="./transformation-algorithms.html#id1487">copy_if</a></h1> | |
| 16 | <div class="section" id="id624"> | |
| 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 | , typename In = <em>unspecified</em> | |
| 23 | > | |
| 24 | struct <a href="./copy-if.html" class="identifier">copy_if</a> | |
| 25 | { | |
| 26 | typedef <em>unspecified</em> type; | |
| 27 | }; | |
| 28 | </pre> | |
| 29 | </div> | |
| 30 | <div class="section" id="id625"> | |
| 31 | <h3><a class="subsection-title" href="#description" name="description">Description</a></h3> | |
| 32 | <p>Returns a filtered copy of the original sequence containing the elements that satisfy | |
| 33 | the predicate <tt class="literal"><span class="pre">Pred</span></tt>.</p> | |
| 34 | <p>[<em>Note:</em> This wording applies to a no-inserter version(s) of the algorithm. See the | |
| 35 | <cite>Expression semantics</cite> subsection for a precise specification of the algorithm's | |
| 36 | details in all cases — <em>end note</em>]</p> | |
| 37 | </div> | |
| 38 | <div class="section" id="id626"> | |
| 39 | <h3><a class="subsection-title" href="#header" name="header">Header</a></h3> | |
| 40 | <pre class="literal-block"> | |
| 41 | #include <<a href="../../../../boost/mpl/copy_if.hpp" class="header">boost/mpl/copy_if.hpp</a>> | |
| 42 | </pre> | |
| 43 | </div> | |
| 44 | <div class="section" id="id627"> | |
| 45 | <h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3> | |
| 46 | <p><a class="reference internal" href="./reversible-algorithm.html">Reversible Algorithm</a></p> | |
| 47 | </div> | |
| 48 | <div class="section" id="id628"> | |
| 49 | <h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3> | |
| 50 | <table border="1" class="docutils table"> | |
| 51 | <colgroup> | |
| 52 | <col width="19%" /> | |
| 53 | <col width="40%" /> | |
| 54 | <col width="40%" /> | |
| 55 | </colgroup> | |
| 56 | <thead valign="bottom"> | |
| 57 | <tr><th class="head">Parameter</th> | |
| 58 | <th class="head">Requirement</th> | |
| 59 | <th class="head">Description</th> | |
| 60 | </tr> | |
| 61 | </thead> | |
| 62 | <tbody valign="top"> | |
| 63 | <tr><td><tt class="literal"><span class="pre">Sequence</span></tt></td> | |
| 64 | <td><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a></td> | |
| 65 | <td>A sequence to copy.</td> | |
| 66 | </tr> | |
| 67 | <tr><td><tt class="literal"><span class="pre">Pred</span></tt></td> | |
| 68 | <td>Unary <a class="reference internal" href="./lambda-expression.html">Lambda Expression</a></td> | |
| 69 | <td>A copying condition.</td> | |
| 70 | </tr> | |
| 71 | <tr><td><tt class="literal"><span class="pre">In</span></tt></td> | |
| 72 | <td><a class="reference internal" href="./inserter.html">Inserter</a></td> | |
| 73 | <td>An inserter.</td> | |
| 74 | </tr> | |
| 75 | </tbody> | |
| 76 | </table> | |
| 77 | </div> | |
| 78 | <div class="section" id="id629"> | |
| 79 | <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3> | |
| 80 | <p>The semantics of an expression are defined only | |
| 81 | where they differ from, or are not defined in <a class="reference internal" href="./reversible-algorithm.html">Reversible Algorithm</a>.</p> | |
| 82 | <p>For any <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a> <tt class="literal"><span class="pre">s</span></tt>, an unary <a class="reference internal" href="./lambda-expression.html">Lambda Expression</a> <tt class="literal"><span class="pre">pred</span></tt>, and | |
| 83 | an <a class="reference internal" href="./inserter.html">Inserter</a> <tt class="literal"><span class="pre">in</span></tt>:</p> | |
| 84 | <pre class="literal-block"> | |
| 85 | typedef <a href="./copy-if.html" class="identifier">copy_if</a><s,pred,in>::type r; | |
| 86 | </pre> | |
| 87 | <table class="docutils field-list" frame="void" rules="none"> | |
| 88 | <col class="field-name" /> | |
| 89 | <col class="field-body" /> | |
| 90 | <tbody valign="top"> | |
| 91 | <tr class="field"><th class="field-name">Return type:</th><td class="field-body"><p class="first">A type.</p> | |
| 92 | </td> | |
| 93 | </tr> | |
| 94 | <tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p> | |
| 95 | <pre class="last literal-block"> | |
| 96 | typedef <a href="./lambda.html" class="identifier">lambda</a><pred>::type p; | |
| 97 | typedef <a href="./lambda.html" class="identifier">lambda</a><in::operation>::type op; | |
| 98 | ||
| 99 | typedef <a href="./fold.html" class="identifier">fold</a>< | |
| 100 | s | |
| 101 | , in::state | |
| 102 | , <a href="./eval-if.html" class="identifier">eval_if</a>< | |
| 103 | <a href="./apply-wrap.html" class="identifier">apply_wrap</a><tt class="literal"><span class="pre">1</span></tt><p,<a href="./placeholders.html" class="identifier">_2</a>> | |
| 104 | , <a href="./apply-wrap.html" class="identifier">apply_wrap</a><tt class="literal"><span class="pre">2</span></tt><op,<a href="./placeholders.html" class="identifier">_1</a>,<a href="./placeholders.html" class="identifier">_2</a>> | |
| 105 | , <a href="./identity.html" class="identifier">identity</a><<a href="./placeholders.html" class="identifier">_1</a>> | |
| 106 | > | |
| 107 | >::type r; | |
| 108 | </pre> | |
| 109 | </td> | |
| 110 | </tr> | |
| 111 | </tbody> | |
| 112 | </table> | |
| 113 | </div> | |
| 114 | <div class="section" id="id630"> | |
| 115 | <h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3> | |
| 116 | <p>Linear. Exactly <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>, and at | |
| 117 | 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">in::operation</span></tt>.</p> | |
| 118 | </div> | |
| 119 | <div class="section" id="id631"> | |
| 120 | <h3><a class="subsection-title" href="#example" name="example">Example</a></h3> | |
| 121 | <pre class="literal-block"> | |
| 122 | typedef <a href="./copy-if.html" class="identifier">copy_if</a>< | |
| 123 | <a href="./range-c.html" class="identifier">range_c</a><int,0,10> | |
| 124 | , <a href="./less.html" class="identifier">less</a>< <a href="./placeholders.html" class="identifier">_1</a>, <a href="./int.html" class="identifier">int_</a><5> > | |
| 125 | , <a href="./back-inserter.html" class="identifier">back_inserter</a>< <a href="./vector.html" class="identifier">vector</a><> > | |
| 126 | >::type result; | |
| 127 | ||
| 128 | <a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( <a href="./size.html" class="identifier">size</a><result>::value, ==, 5 ); | |
| 129 | <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( <a href="./equal.html" class="identifier">equal</a><result,<a href="./range-c.html" class="identifier">range_c</a><int,0,5> > )); | |
| 130 | </pre> | |
| 131 | </div> | |
| 132 | <div class="section" id="id632"> | |
| 133 | <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3> | |
| 134 | <p><a class="reference internal" href="./transformation-algorithms.html">Transformation Algorithms</a>, <a class="reference internal" href="./reversible-algorithm.html">Reversible Algorithm</a>, <a class="reference internal" href="./reverse-copy-if.html">reverse_copy_if</a>, <a class="reference internal" href="./copy.html">copy</a>, <a class="reference internal" href="./remove-if.html">remove_if</a>, <a class="reference internal" href="./replace-if.html">replace_if</a></p> | |
| 135 | <!-- Algorithms/Transformation Algorithms//transform |30 --> | |
| 136 | </div> | |
| 137 | </div> | |
| 138 | ||
| 139 | <div class="footer-separator"></div> | |
| 140 | <table class="footer"><tr class="footer"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./copy.html" class="navigation-link">Prev</a> <a href="./transform.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./copy.html" class="navigation-link">Back</a> <a href="./transform.html" class="navigation-link">Along</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./transformation-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> | |
| 141 | <td><div class="copyright-footer"><div class="copyright">Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams</div> | |
| 142 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
| 143 | 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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