<p>In <a href="https://github.com/mlpack/mlpack/pull/724#discussion_r71200103">src/mlpack/core/tree/rectangle_tree/traits.hpp</a>:</p>
<pre style='color:#555'>&gt; +         template&lt;typename&gt; class SweepType,
&gt; +         typename DescentType,
&gt; +         template&lt;typename&gt; class AuxiliaryInformationType&gt;
&gt; +class TreeTraits&lt;RectangleTree&lt;MetricType,
&gt; +    StatisticType,
&gt; +    MatType,
&gt; +    RPlusTreeSplit&lt;SplitPolicyType,
&gt; +                   SweepType&gt;,
&gt; +    DescentType,
&gt; +    AuxiliaryInformationType&gt;&gt;
&gt; +{
&gt; + public:
&gt; +  /**
&gt; +   * The R+/R++ tree can&#39;t have overlapping children.
&gt; +   */
&gt; +  static const bool HasOverlappingChildren = false;
</pre>
<p>I thought that there was a degenerate case that could occur with the R+ tree where nodes could end up overlapping.  I don't remember the exact details; is that still true?  Or did your code work around that situation?</p>

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