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78 lines
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<title>The MPL Reference Manual: pair</title>
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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-miscellaneous.html" class="navigation-link">Miscellaneous</a> / <a href="./pair.html" class="navigation-link">pair</a></td>
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<div class="section" id="pair">
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<h1><a class="toc-backref" href="./data-miscellaneous.html#id506" name="pair">pair</a></h1>
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<div class="section" id="pair-synopsis">
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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="pair-description">
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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="pair-header">
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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="pair-example">
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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<_1> >
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, <a href="./if.html" class="identifier">if_</a><
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<a href="./less.html" class="identifier">less</a>< _2, <a href="./int.html" class="identifier">int_</a><0> >
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, <a href="./next.html" class="identifier">next</a>< second<_1> >
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, second<_1>
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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="pair-see-also">
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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" href="./data-types.html">Data Types</a>, <a class="reference" href="./sequences.html">Sequences</a>, <a class="refentry reference" href="./trivial-metafunctions.html#trivial-first"><tt class="refentry literal"><span class="pre">first</span></tt></a>, <a class="refentry reference" href="./trivial-metafunctions.html#trivial-second"><tt class="refentry literal"><span class="pre">second</span></tt></a></p>
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