<p>In <a href="https://github.com/mlpack/mlpack/pull/664#discussion_r67919507">src/mlpack/core/tree/rectangle_tree/hilbert_r_tree_auxiliary_information_impl.hpp</a>:</p>
<pre style='color:#555'>&gt; +  {
&gt; +    // Get the position at which the point should be inserted
&gt; +    // Update the largest Hilbert value of the node
&gt; +    size_t pos = hilbertValue.InsertPoint(node, node-&gt;Dataset().col(point));
&gt; +
&gt; +    // Move points
&gt; +    for (size_t i = node-&gt;NumPoints(); i &gt; pos; i--)
&gt; +      node-&gt;Points()[i] = node-&gt;Points()[i-1];
&gt; +    // Insert the point
&gt; +    node-&gt;Points()[pos] = point;
&gt; +    node-&gt;Count()++;
&gt; +  }
&gt; +  else
&gt; +  {
&gt; +    // Calculate the Hilbert value
&gt; +    hilbertValue.InsertPoint(node, node-&gt;Dataset().col(point));
</pre>
<p>Oh, you're right, I see now.  I agree, depending only on <code>TreeElemType</code> is better, so we shouldn't refactor it.</p>

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