e stored in
            the <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">optional</span><span class="special">&lt;&gt;</span></code>.
            Otherwise the generators will fail.
          </p></td></tr>
</table></div>
<h6>
<a name="spirit.karma.reference.auto.h7"></a>
          <span class="phrase"><a name="spirit.karma.reference.auto.complexity"></a></span><a class="link" href="auto.html#spirit.karma.reference.auto.complexity"