<p>In <a href="https://github.com/mlpack/mlpack/pull/664#discussion_r67892163">src/mlpack/core/tree/rectangle_tree/hilbert_r_tree_auxiliary_information_impl.hpp</a>:</p>
<pre style='color:#555'>&gt; +template&lt;typename TreeType,
&gt; +         template&lt;typename&gt; class HilbertValueType&gt;
&gt; +HilbertRTreeAuxiliaryInformation&lt;TreeType, HilbertValueType&gt;::
&gt; +HilbertRTreeAuxiliaryInformation(const HilbertRTreeAuxiliaryInformation&amp; other) :
&gt; +    hilbertValue(other.HilbertValue())
&gt; +{
&gt; +
&gt; +};
&gt; +
&gt; +template&lt;typename TreeType,
&gt; +         template&lt;typename&gt; class HilbertValueType&gt;
&gt; +HilbertRTreeAuxiliaryInformation&lt;TreeType, HilbertValueType&gt;::
&gt; +~HilbertRTreeAuxiliaryInformation()
&gt; +{
&gt; +
&gt; +}
</pre>
<p>If the destructor does nothing we can just omit it. :)</p>

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