bidirectional_iteratable">bidirectional_iteratable&lt;T,
            P&gt;</a></code></li>

            <li><code><a href=
            "#totally_ordered1">totally_ordered&lt;T&gt;</a></code></li>

            <li><code><a href="#additive2">additive&lt;T,
            D&gt;</a></code></li>

            <li><code><a href="#indexable">indexable&lt;T, D,
            R&gt;</a></code></li>
          </ul>
        </td>
      </tr>
    </table>

    <h3><a name="iterator">Iterator</a> Helpers</h3>

    <p>There are