distance</strong>(</code>
              </td>
              <td>genType <var class="pdparam">p0</var>, </td>
            </tr>
            <tr>
              <td> </td>
              <td>genType <var class="pdparam">p1</var><code>)</code>;</td>
            </tr>
          </table>
          <div class="funcprototype-spacer"> </div>
        </div>
      </div>
      <div class="refsect1" id="parameters">
        <h2>Parameters</h2>
        <div class="variablelist">
          <dl class="variablelist">
    