ceph/src/boost/libs/mpl/doc/refmanual/pair.html

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  14 <div class="section" id="pair">
  15 <h1><a class="toc-backref" href="./data-types-miscellaneous.html#id1583">pair</a></h1>
  16 <div class="section" id="id1271">
  17 <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
  18 <pre class="literal-block">
  19 template&lt;
  20       typename T1
  21     , typename T2
  22     &gt;
  23 struct <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="id1272">
  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="id1273">
  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="id1274">
  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
  44 elements among these.</p>
  45 <pre class="literal-block">
  46 typedef <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;<a href="./placeholders.html" class="identifier">_1</a>&gt; &gt;
  51         , <a href="./if.html" class="identifier">if_</a>&lt;
  52               <a href="./less.html" class="identifier">less</a>&lt; <a href="./placeholders.html" class="identifier">_2</a>, <a href="./int.html" class="identifier">int_</a>&lt;0&gt; &gt;
  53             , <a href="./next.html" class="identifier">next</a>&lt; second&lt;<a href="./placeholders.html" class="identifier">_1</a>&gt; &gt;
  54             , second&lt;<a href="./placeholders.html" class="identifier">_1</a>&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="id1275">
  64 <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
  65 <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>
  66 <!-- Data Types/Miscellaneous//empty_base |20 -->
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  72 <td><div class="copyright-footer"><div class="copyright">Copyright ©  2001-2009 Aleksey Gurtovoy and David Abrahams</div>
  73 Distributed under the Boost Software License, Version 1.0. (See accompanying
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