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7<title>The MPL Reference Manual: pair</title>
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14<div class="section" id="pair">
15<h1><a class="toc-backref" href="./data-miscellaneous.html#id506" name="pair">pair</a></h1>
16<div class="section" id="pair-synopsis">
17<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
18<pre class="literal-block">
19template&lt;
20      typename T1
21    , typename T2
22    &gt;
23struct <a href="./pair.html" class="identifier">pair</a>
24{
25    typedef <a href="./pair.html" class="identifier">pair</a> type;
26    typedef T1 first;
27    typedef T2 second;
28};
29</pre>
30</div>
31<div class="section" id="pair-description">
32<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
33<p>A transparent holder for two arbitrary types.</p>
34</div>
35<div class="section" id="pair-header">
36<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
37<pre class="literal-block">
38#include &lt;<a href="../../../../boost/mpl/pair.hpp" class="header">boost/mpl/pair.hpp</a>&gt;
39</pre>
40</div>
41<div class="section" id="pair-example">
42<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
43<p>Count a number of elements in the sequence together with a number of negative
44elements among these.</p>
45<pre class="literal-block">
46typedef <a href="./fold.html" class="identifier">fold</a>&lt;
47      <a href="./vector-c.html" class="identifier">vector_c</a>&lt;int,-1,0,5,-7,-2,4,5,7&gt;
48    , <a href="./pair.html" class="identifier">pair</a>&lt; <a href="./int.html" class="identifier">int_</a>&lt;0&gt;, <a href="./int.html" class="identifier">int_</a>&lt;0&gt; &gt;
49    , <a href="./pair.html" class="identifier">pair</a>&lt; 
50          <a href="./next.html" class="identifier">next</a>&lt; first&lt;_1&gt; &gt;
51        , <a href="./if.html" class="identifier">if_</a>&lt; 
52              <a href="./less.html" class="identifier">less</a>&lt; _2, <a href="./int.html" class="identifier">int_</a>&lt;0&gt; &gt;
53            , <a href="./next.html" class="identifier">next</a>&lt; second&lt;_1&gt; &gt;
54            , second&lt;_1&gt; 
55            &gt;
56        &gt;
57    &gt;::type p;
58
59<a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( p::first::value, ==, 8 );
60<a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( p::second::value, ==, 3 );
61</pre>
62</div>
63<div class="section" id="pair-see-also">
64<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
65<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>
66<!-- modtime: November 10, 2004 04:36:35 +0000 -->
67<!-- Data Types/Miscellaneous//empty_base |20 -->
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