<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'>&gt; + */
&gt; +template&lt;typename MetricType = metric::LMetric&lt;2, true&gt;,
&gt; +         typename VecType = arma::vec&gt;
&gt; +class HollowBallBound
&gt; +{
&gt; + public:
&gt; +  //! The underlying data type.
&gt; +  typedef typename VecType::elem_type ElemType;
&gt; +  //! A public version of the vector type.
&gt; +  typedef VecType Vec;
&gt; +
&gt; + private:
&gt; +  //! The radius of the inner ball bound.
&gt; +  ElemType innerRadius;
&gt; +  //! The radius of the outer ball bound.
&gt; +  ElemType outerRadius;
</pre>
<p>It might be reasonable to use <code>math::Range</code> here.</p>

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