projects / ceph.git / blame
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1 | <?xml version="1.0" encoding="utf-8" ?> |
| 2 | <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> | |
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| 4 | <head> | |
| 5 | <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> | |
| 6 | <meta name="generator" content="Docutils 0.7: http://docutils.sourceforge.net/" /> | |
| 7 | <title>The MPL Reference Manual: filter_view</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="./empty-sequence.html" class="navigation-link">Prev</a> <a href="./iterator-range.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./empty-sequence.html" class="navigation-link">Back</a> <a href="./iterator-range.html" class="navigation-link">Along</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./views.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="./views.html" class="navigation-link">Views</a> / <a href="./filter-view.html" class="navigation-link">filter_view</a></td> | |
| 13 | </tr></table><div class="header-separator"></div> | |
| 14 | <div class="section" id="filter-view"> | |
| 15 | <h1><a class="toc-backref" href="./views.html#id1418">filter_view</a></h1> | |
| 16 | <div class="section" id="id126"> | |
| 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="./filter-view.html" class="identifier">filter_view</a> | |
| 24 | { | |
| 25 | // <em>unspecified</em> | |
| 26 | // <em>...</em> | |
| 27 | }; | |
| 28 | </pre> | |
| 29 | </div> | |
| 30 | <div class="section" id="id127"> | |
| 31 | <h3><a class="subsection-title" href="#description" name="description">Description</a></h3> | |
| 32 | <p>A view into a subset of <tt class="literal"><span class="pre">Sequence</span></tt>'s elements satisfying the predicate <tt class="literal"><span class="pre">Pred</span></tt>.</p> | |
| 33 | </div> | |
| 34 | <div class="section" id="id128"> | |
| 35 | <h3><a class="subsection-title" href="#header" name="header">Header</a></h3> | |
| 36 | <pre class="literal-block"> | |
| 37 | #include <<a href="../../../../boost/mpl/filter_view.hpp" class="header">boost/mpl/filter_view.hpp</a>> | |
| 38 | </pre> | |
| 39 | </div> | |
| 40 | <div class="section" id="id129"> | |
| 41 | <h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3> | |
| 42 | <ul class="simple"> | |
| 43 | <li><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a></li> | |
| 44 | </ul> | |
| 45 | </div> | |
| 46 | <div class="section" id="parameters"> | |
| 47 | <h3>Parameters</h3> | |
| 48 | <table border="1" class="docutils table"> | |
| 49 | <colgroup> | |
| 50 | <col width="15%" /> | |
| 51 | <col width="36%" /> | |
| 52 | <col width="48%" /> | |
| 53 | </colgroup> | |
| 54 | <thead valign="bottom"> | |
| 55 | <tr><th class="head">Parameter</th> | |
| 56 | <th class="head">Requirement</th> | |
| 57 | <th class="head">Description</th> | |
| 58 | </tr> | |
| 59 | </thead> | |
| 60 | <tbody valign="top"> | |
| 61 | <tr><td><tt class="literal"><span class="pre">Sequence</span></tt></td> | |
| 62 | <td><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a></td> | |
| 63 | <td>A sequence to wrap.</td> | |
| 64 | </tr> | |
| 65 | <tr><td><tt class="literal"><span class="pre">Pred</span></tt></td> | |
| 66 | <td>Unary <a class="reference internal" href="./lambda-expression.html">Lambda Expression</a></td> | |
| 67 | <td>A filtering predicate.</td> | |
| 68 | </tr> | |
| 69 | </tbody> | |
| 70 | </table> | |
| 71 | </div> | |
| 72 | <div class="section" id="id130"> | |
| 73 | <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3> | |
| 74 | <p>Semantics of an expression is defined only where it differs from, or is not | |
| 75 | defined in <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a>.</p> | |
| 76 | <p>In the following table, <tt class="literal"><span class="pre">v</span></tt> is an instance of <tt class="literal"><span class="pre"><a href="./filter-view.html" class="identifier">filter_view</a></span></tt>, <tt class="literal"><span class="pre">s</span></tt> is an arbitrary | |
| 77 | <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a>, <tt class="literal"><span class="pre">pred</span></tt> is an unary <a class="reference internal" href="./lambda-expression.html">Lambda Expression</a>.</p> | |
| 78 | <table border="1" class="docutils table"> | |
| 79 | <colgroup> | |
| 80 | <col width="40%" /> | |
| 81 | <col width="60%" /> | |
| 82 | </colgroup> | |
| 83 | <thead valign="bottom"> | |
| 84 | <tr><th class="head">Expression</th> | |
| 85 | <th class="head">Semantics</th> | |
| 86 | </tr> | |
| 87 | </thead> | |
| 88 | <tbody valign="top"> | |
| 89 | <tr><td><pre class="first last literal-block"> | |
| 90 | <a href="./filter-view.html" class="identifier">filter_view</a><s,pred> | |
| 91 | <a href="./filter-view.html" class="identifier">filter_view</a><s,pred>::type | |
| 92 | </pre> | |
| 93 | </td> | |
| 94 | <td>A lazy <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a> sequence of all the elements in | |
| 95 | 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>) that satisfy the predicate | |
| 96 | <tt class="literal"><span class="pre">pred</span></tt>.</td> | |
| 97 | </tr> | |
| 98 | <tr><td><tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a><v>::type</span></tt></td> | |
| 99 | <td>The size of <tt class="literal"><span class="pre">v</span></tt>; | |
| 100 | <tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a><v>::value</span> <span class="pre">==</span> <span class="pre"><a href="./count-if.html" class="identifier">count_if</a><s,pred>::value</span></tt>; | |
| 101 | linear complexity; see <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a>.</td> | |
| 102 | </tr> | |
| 103 | </tbody> | |
| 104 | </table> | |
| 105 | </div> | |
| 106 | <div class="section" id="id131"> | |
| 107 | <h3><a class="subsection-title" href="#example" name="example">Example</a></h3> | |
| 108 | <p>Find the largest floating type in a sequence.</p> | |
| 109 | <pre class="literal-block"> | |
| 110 | typedef <a href="./vector.html" class="identifier">vector</a><int,float,long,float,char[50],long double,char> types; | |
| 111 | typedef <a href="./max-element.html" class="identifier">max_element</a>< | |
| 112 | <a href="./transform-view.html" class="identifier">transform_view</a>< <a href="./filter-view.html" class="identifier">filter_view</a>< types,boost::is_float<_> >, size_of<_> > | |
| 113 | >::type iter; | |
| 114 | ||
| 115 | <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same< <a href="./deref.html" class="identifier">deref</a><iter::base>::type, long double > )); | |
| 116 | </pre> | |
| 117 | </div> | |
| 118 | <div class="section" id="id132"> | |
| 119 | <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3> | |
| 120 | <p><a class="reference internal" href="./sequences.html">Sequences</a>, <a class="reference internal" href="./views.html">Views</a>, <a class="reference internal" href="./transform-view.html">transform_view</a>, <a class="reference internal" href="./joint-view.html">joint_view</a>, <a class="reference internal" href="./zip-view.html">zip_view</a>, <a class="reference internal" href="./iterator-range.html">iterator_range</a></p> | |
| 121 | <!-- Sequences/Views//iterator_range --> | |
| 122 | </div> | |
| 123 | </div> | |
| 124 | ||
| 125 | <div class="footer-separator"></div> | |
| 126 | <table class="footer"><tr class="footer"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./empty-sequence.html" class="navigation-link">Prev</a> <a href="./iterator-range.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./empty-sequence.html" class="navigation-link">Back</a> <a href="./iterator-range.html" class="navigation-link">Along</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./views.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> | |
| 127 | <td><div class="copyright-footer"><div class="copyright">Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams</div> | |
| 128 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
| 129 | 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> | |
| 130 | </html> |