<p>In <a href="https://github.com/mlpack/mlpack/pull/709#discussion_r68849427">src/mlpack/core/tree/rectangle_tree/rectangle_tree.hpp</a>:</p>
<pre style='color:#555'>> @@ -424,7 +419,10 @@ class RectangleTree
> *
> * @param index Index of point for which a dataset index is wanted.
> */
> - size_t Point(const size_t index) const;
> + const size_t& Point(const size_t index) const { return points[index]; }
</pre>
<p>You're right, the reference is not needed here.</p>
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