[mlpack-git] [mlpack/mlpack] Hilbert R tree (#664)

[Ryan Curtin]

> +    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),

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.

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