class="pre">second&lt;x&gt;::type</span></tt></td>
<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>
</tr>
<tr><td><tt class="literal"><span class="pre">base&lt;x&gt;::type</span></tt></td>
<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>
</tr>
</tbody>
</table>
<div class="section" id="id1136">
<h3>