<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'>> +template<typename TreeType,
> + template<typename> class HilbertValueType>
> +HilbertRTreeAuxiliaryInformation<TreeType, HilbertValueType>::
> +HilbertRTreeAuxiliaryInformation(const HilbertRTreeAuxiliaryInformation& other) :
> + hilbertValue(other.HilbertValue())
> +{
> +
> +};
> +
> +template<typename TreeType,
> + template<typename> class HilbertValueType>
> +HilbertRTreeAuxiliaryInformation<TreeType, HilbertValueType>::
> +~HilbertRTreeAuxiliaryInformation()
> +{
> +
> +}
</pre>
<p>If the destructor does nothing we can just omit it. :)</p>
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