<p>In <a href="https://github.com/mlpack/mlpack/pull/708#discussion_r71204100">src/mlpack/core/tree/hollow_ball_bound.hpp</a>:</p>
<pre style='color:#555'>> + */
> +template<typename MetricType = metric::LMetric<2, true>,
> + typename VecType = arma::vec>
> +class HollowBallBound
> +{
> + public:
> + //! The underlying data type.
> + typedef typename VecType::elem_type ElemType;
> + //! A public version of the vector type.
> + typedef VecType Vec;
> +
> + private:
> + //! The radius of the inner ball bound.
> + ElemType innerRadius;
> + //! The radius of the outer ball bound.
> + ElemType outerRadius;
</pre>
<p>It might be reasonable to use <code>math::Range</code> here.</p>
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