<p>In <a href="https://github.com/mlpack/mlpack/pull/664#discussion_r67882986">src/mlpack/core/tree/rectangle_tree/discrete_hilbert_value_impl.hpp</a>:</p>
<pre style='color:#555'>> + ownsLocalDataset = true;
> + }
> +
> + if (ownsLocalDataset)
> + {
> + localDataset = new arma::Mat<HilbertElemType>(tree->Dataset().n_rows,
> + tree->MaxLeafSize() + 1);
> + }
> +
> +}
> +
> +template<typename TreeElemType>
> +DiscreteHilbertValue<TreeElemType>::
> +DiscreteHilbertValue(const DiscreteHilbertValue& other) :
> + localDataset(const_cast<arma::Mat<HilbertElemType>*>(other.LocalDataset())),
> + ownsLocalDataset(other.ownsLocalDataset),
</pre>
<p>Yeah, I agree, that does look weird. I think that maybe some refactoring could help here but I am not sure how right now. Let's leave it for another PR.</p>
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