n type, <code class="computeroutput"><span class="identifier">P</span></code>
                      is a NaryParser, <code class="computeroutput"><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">false_</span></code>
                      otherwise (See <a href="../../../../../../../../libs/mpl/doc/refmanual/integral-constant.html" target="_top">MPL
                      Boolean Constant</a>).
                    </p>
                  </td>
</tr>
</tbody>
</table></