<p>In <a href="https://github.com/mlpack/mlpack/pull/699#discussion_r69033550">src/mlpack/core/tree/rectangle_tree/minimal_coverage_sweep.hpp</a>:</p>
<pre style='color:#555'>&gt; + * @tparam SplitPolicy The class that provides rules for inserting children of
&gt; + *    a node that is being split into two new subtrees.
&gt; + */
&gt; +template&lt;typename SplitPolicy&gt;
&gt; +class MinimalCoverageSweep
&gt; +{
&gt; + private:
&gt; +  /**
&gt; +   * Class to allow for faster sorting.
&gt; +   */
&gt; +  template&lt;typename ElemType&gt;
&gt; +  struct SortStruct
&gt; +  {
&gt; +    ElemType d;
&gt; +    int n;
&gt; +  };
</pre>
<p>No, I haven't. I think these approaches are equal.</p>

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