e&lt;T&gt;</a></code></li>
          </ul>
        </td>
      </tr>

      <tr>
        <td><code><a name="shiftable1">shiftable&lt;T&gt;</a></code><br>
         <code>shiftable1&lt;T&gt;</code></td>

        <td>
          <ul>
            <li><code><a href=
            "#left_shiftable1">left_shiftable&lt;T&gt;</a></code></li>

            <li><code><a href=
            "#right_shiftable1">right_shiftable&lt;T&gt;</a></code></li>
          </ul>
        </td>
      </tr>

      <tr>
        <td><code><a 