<p>In <a href="https://github.com/mlpack/mlpack/pull/699#discussion_r69019122">src/mlpack/core/tree/rectangle_tree/r_plus_plus_tree_auxiliary_information.hpp</a>:</p>
<pre style='color:#555'>> + /**
> + * Nullify the auxiliary information in order to prevent an invalid free.
> + */
> + void NullifyData();
> +
> + //! Return the maximum bounding rectangle.
> + bound::HRectBound<metric::EuclideanDistance, ElemType>& OuterBound()
> + { return outerBound; }
> +
> + //! Modify the maximum bounding rectangle.
> + const bound::HRectBound<metric::EuclideanDistance, ElemType>&
> + OuterBound() const
> + { return outerBound; }
> + private:
> + //! The maximum bounding rectangle.
> + bound::HRectBound<metric::EuclideanDistance, ElemType> outerBound;
</pre>
<p>It might be useful to typedef this type since you are using it a lot in the class and the name is long.</p>
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