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

[Ryan Curtin]

> +  const arma::Col<HilbertElemType>* ValueToInsert() const
> +  { return valueToInsert; }
> +
> + private:
> +  //! The number of bits that we can store
> +  static constexpr size_t order = sizeof(HilbertElemType) * CHAR_BIT;
> +  //! The local dataset
> +  arma::Mat<HilbertElemType>* localDataset;
> +  //! Indicates that the node owns the local dataset
> +  bool ownsLocalDataset;
> +  //! The number of values in the local dataset
> +  size_t numValues;
> +  //! The Hilbert value of the point that is being inserted
> +  arma::Col<HilbertElemType>* valueToInsert;
> +  //! Indicates that the node owns the valueToInsert 
> +  bool ownsValueToInsert;

Why not make valueToInsert just an `arma::Col<HilbertElemType>`, not a pointer to one?  Then you don't have to worry about any memory management.

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