76 lines
5.9 KiB
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76 lines
5.9 KiB
HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<meta name="generator" content="Docutils 0.7: http://docutils.sourceforge.net/" />
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<title>The MPL Reference Manual: pair</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="./data-types-miscellaneous.html" class="navigation-link">Prev</a> <a href="./empty-base.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group">Back <a href="./empty-base.html" class="navigation-link">Along</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./data-types-miscellaneous.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="./data-types.html" class="navigation-link">Data Types</a> / <a href="./data-types-miscellaneous.html" class="navigation-link">Miscellaneous</a> / <a href="./pair.html" class="navigation-link">pair</a></td>
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</tr></table><div class="header-separator"></div>
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<div class="section" id="pair">
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<h1><a class="toc-backref" href="./data-types-miscellaneous.html#id1583">pair</a></h1>
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<div class="section" id="id1271">
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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 T1
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, typename T2
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>
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struct <a href="./pair.html" class="identifier">pair</a>
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{
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typedef <a href="./pair.html" class="identifier">pair</a> type;
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typedef T1 first;
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typedef T2 second;
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};
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</pre>
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</div>
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<div class="section" id="id1272">
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<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
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<p>A transparent holder for two arbitrary types.</p>
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</div>
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<div class="section" id="id1273">
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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/pair.hpp" class="header">boost/mpl/pair.hpp</a>>
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</pre>
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</div>
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<div class="section" id="id1274">
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<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
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<p>Count a number of elements in the sequence together with a number of negative
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elements among these.</p>
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<pre class="literal-block">
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typedef <a href="./fold.html" class="identifier">fold</a><
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<a href="./vector-c.html" class="identifier">vector_c</a><int,-1,0,5,-7,-2,4,5,7>
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, <a href="./pair.html" class="identifier">pair</a>< <a href="./int.html" class="identifier">int_</a><0>, <a href="./int.html" class="identifier">int_</a><0> >
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, <a href="./pair.html" class="identifier">pair</a><
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<a href="./next.html" class="identifier">next</a>< first<<a href="./placeholders.html" class="identifier">_1</a>> >
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, <a href="./if.html" class="identifier">if_</a><
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<a href="./less.html" class="identifier">less</a>< <a href="./placeholders.html" class="identifier">_2</a>, <a href="./int.html" class="identifier">int_</a><0> >
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, <a href="./next.html" class="identifier">next</a>< second<<a href="./placeholders.html" class="identifier">_1</a>> >
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, second<<a href="./placeholders.html" class="identifier">_1</a>>
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>
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>
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>::type p;
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<a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( p::first::value, ==, 8 );
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<a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( p::second::value, ==, 3 );
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</pre>
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</div>
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<div class="section" id="id1275">
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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="./data-types.html">Data Types</a>, <a class="reference internal" href="./sequences.html">Sequences</a>, <a class="reference internal" href="./trivial-metafunctions-summary.html#first">first</a>, <a class="reference internal" href="./trivial-metafunctions-summary.html#second">second</a></p>
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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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