<p>In <a href="https://github.com/mlpack/mlpack/pull/760#discussion_r74689613">src/mlpack/core/tree/hollow_ball_bound.hpp</a>:</p>
<pre style='color:#555'>&gt; @@ -213,6 +221,21 @@ struct BoundTraits&lt;HollowBallBound&lt;MetricType, ElemType&gt;&gt;
&gt;    const static bool HasTightBounds = false;
&gt;  };
&gt;  
&gt; +namespace meta {
&gt; +
&gt; +template&lt;typename BoundType&gt;
&gt; +struct IsHollowBallBound
&gt; +{
&gt; +  static const bool value = false;
&gt; +};
&gt; +
&gt; +template&lt;typename MetricType, typename ElemType&gt;
&gt; +struct IsHollowBallBound&lt;HollowBallBound&lt;MetricType, ElemType&gt;&gt;
&gt; +{
&gt; +  static const bool value = true;
&gt; +};
&gt; +
</pre>
<p>yeah, I agree. I thought it will be useful, but then I realized that I needn't it.</p>

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