                    The spatial index.
                    </p>
                  </td>
</tr>
<tr>
<td>
                    <p>
                      <code class="computeroutput"><span class="identifier">ConvertibleOrRange</span>
                      <span class="keyword">const</span> <span class="special">&amp;</span></code>
                    </p>
                  </td>
<td>
                    <p>
                      <code class="computeroutput"><span class="identifier">conv_or_rng</span></code>
   