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6 | <meta name="generator" content="Docutils 0.7: http://docutils.sourceforge.net/" /> | |
7 | <title>The MPL Reference Manual: filter_view</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="./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 | ||
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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> |