/td><td>)</td>
          <td> const</td>
        </tr>
      </table>
  </td>
  <td class="mlabels-right">
<span class="mlabels"><span class="mlabel">inline</span><span class="mlabel">nodiscard</span><span class="mlabel">noexcept</span></span>  </td>
  </tr>
</table>
</div><div class="memdoc">

<p>Returns an iterator to the first entity of the group. </p>
<p>If the group is empty, the returned iterator will be equal to <code><a class="el" href="#a99c4a0d307973232a293a83e85d578f5" title="Returns an iterator 