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<title>The MPL Reference Manual: filter_view</title>
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<body class="docframe refmanual">
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<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>
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<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>
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</tr></table><div class="header-separator"></div>
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<div class="section" id="filter-view">
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<h1><a class="toc-backref" href="./views.html#id1418">filter_view</a></h1>
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<div class="section" id="id126">
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<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
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<pre class="literal-block">
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template<
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typename Sequence
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, typename Pred
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>
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struct <a href="./filter-view.html" class="identifier">filter_view</a>
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{
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// <em>unspecified</em>
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// <em>...</em>
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};
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</pre>
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</div>
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<div class="section" id="id127">
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<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
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<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>
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</div>
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<div class="section" id="id128">
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<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
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<pre class="literal-block">
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#include <<a href="../../../../boost/mpl/filter_view.hpp" class="header">boost/mpl/filter_view.hpp</a>>
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</pre>
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</div>
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<div class="section" id="id129">
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<h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3>
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<ul class="simple">
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<li><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a></li>
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</ul>
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</div>
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<div class="section" id="parameters">
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<h3>Parameters</h3>
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<table border="1" class="docutils table">
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<colgroup>
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<col width="15%" />
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<col width="36%" />
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<thead valign="bottom">
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<tr><th class="head">Parameter</th>
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<th class="head">Requirement</th>
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<th class="head">Description</th>
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</tr>
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</thead>
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<tbody valign="top">
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<tr><td><tt class="literal"><span class="pre">Sequence</span></tt></td>
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<td><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a></td>
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<td>A sequence to wrap.</td>
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</tr>
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<tr><td><tt class="literal"><span class="pre">Pred</span></tt></td>
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<td>Unary <a class="reference internal" href="./lambda-expression.html">Lambda Expression</a></td>
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<td>A filtering predicate.</td>
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</tr>
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</tbody>
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</table>
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</div>
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<div class="section" id="id130">
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<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
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<p>Semantics of an expression is defined only where it differs from, or is not
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defined in <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a>.</p>
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<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
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<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>
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<col width="40%" />
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<col width="60%" />
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<thead valign="bottom">
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<tr><th class="head">Expression</th>
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<th class="head">Semantics</th>
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</tr>
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</thead>
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<tbody valign="top">
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<tr><td><pre class="first last literal-block">
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<a href="./filter-view.html" class="identifier">filter_view</a><s,pred>
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<a href="./filter-view.html" class="identifier">filter_view</a><s,pred>::type
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</pre>
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</td>
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<td>A lazy <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a> sequence of all the elements in
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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
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<tt class="literal"><span class="pre">pred</span></tt>.</td>
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</tr>
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<tr><td><tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a><v>::type</span></tt></td>
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<td>The size of <tt class="literal"><span class="pre">v</span></tt>;
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<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>;
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linear complexity; see <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a>.</td>
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</tr>
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</tbody>
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</table>
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</div>
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<div class="section" id="id131">
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<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
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<p>Find the largest floating type in a sequence.</p>
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<pre class="literal-block">
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typedef <a href="./vector.html" class="identifier">vector</a><int,float,long,float,char[50],long double,char> types;
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typedef <a href="./max-element.html" class="identifier">max_element</a><
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<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<_> >
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>::type iter;
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<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 > ));
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</pre>
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</div>
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<div class="section" id="id132">
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<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
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<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>
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<!-- Sequences/Views//iterator_range -->
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<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>
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<td><div class="copyright-footer"><div class="copyright">Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams</div>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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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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