<p>In <a href="https://github.com/mlpack/mlpack/pull/664#discussion_r67909500">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>Hm.. Right now the DiscreteHilbertValue does not depend on <code>TreeType</code> or <code>MatType</code>. It depends only on <code>TreeElemType</code>. I think this is the weakest requirement. So, I think we should not refactor that. What do you think about it?</p>

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