code must link against a <a href="http://flex.sourceforge.net/" target="_top">Flex</a>
                  generated scanner.
                </p>
              </td>
</tr>
<tr>
<td>
                <p>
                  <code class="computeroutput"><span class="identifier">functor_input</span></code>
                </p>
              </td>
<td>
                <p>
                  This input policy obtains it's data by calling a functor of type
                  <code class="computeroutput"><span class="id