 the functor must contain a static variable named <code class="computeroutput"><span class="identifier">eof</span></code> which is comparable to a
                  variable of <code class="computeroutput"><span class="identifier">result_type</span></code>.
                </p>
              </td>
</tr>
<tr>
<td>
                <p>
                  <code class="computeroutput"><span class="identifier">split_functor_input</span></code>
                </p>
              </td>
<td>
                <p>
     