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  15. <h1><a class="toc-backref" href="./trivial.html#id1560">Trivial Metafunctions Summary</a></h1>
  16. <p>In the following table, <tt class="literal"><span class="pre">x</span></tt> is an arbitrary class type.</p>
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  23. <tr><th class="head">Metafunction</th>
  24. <th class="head">Header</th>
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  28. <tr><td><tt class="literal"><span class="pre">first&lt;x&gt;::type</span></tt></td>
  29. <td><tt class="literal"><span class="pre">#include &lt;<a href="../../../../boost/mpl/pair.hpp" class="header">boost/mpl/pair.hpp</a>&gt;</span></tt></td>
  30. </tr>
  31. <tr><td><tt class="literal"><span class="pre">second&lt;x&gt;::type</span></tt></td>
  32. <td><tt class="literal"><span class="pre">#include &lt;<a href="../../../../boost/mpl/pair.hpp" class="header">boost/mpl/pair.hpp</a>&gt;</span></tt></td>
  33. </tr>
  34. <tr><td><tt class="literal"><span class="pre">base&lt;x&gt;::type</span></tt></td>
  35. <td><tt class="literal"><span class="pre">#include &lt;<a href="../../../../boost/mpl/base.hpp" class="header">boost/mpl/base.hpp</a>&gt;</span></tt></td>
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  40. <h3><a class="subsection-title" href="#see-also" name="see-also">See Also</a></h3>
  41. <p><a class="reference internal" href="./metafunctions.html">Metafunctions</a>, <a class="reference internal" href="./trivial-metafunction.html">Trivial Metafunction</a></p>
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