<p>In <a href="https://github.com/mlpack/mlpack/pull/747#discussion_r74694609">src/mlpack/core/tree/space_split/projection_vector.hpp</a>:</p>
<pre style='color:#555'>&gt; +   * @param point Point to be projected.
&gt; +   */
&gt; +  template&lt;typename VecType&gt;
&gt; +  double Project(const VecType&amp; point,
&gt; +                 typename boost::enable_if&lt;IsVector&lt;VecType&gt; &gt;::type* = 0) const
&gt; +  {
&gt; +    return point[dim];
&gt; +  };
&gt; +
&gt; +  /**
&gt; +   * Project the given hrect bound on the projection vector.
&gt; +   *
&gt; +   * @param bound Bound to be projected.
&gt; +   * @return Range of projected values.
&gt; +   */
&gt; +  template&lt;typename MetricType&gt;
</pre>
<p><code>HRectBound</code> also has an <code>ElemType</code> template parameter, so either we should add <code>ElemType</code> as a template parameter to this function, or to this class.  Otherwise this will not work for trees built with different <code>ElemType</code>s.</p>

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