<p>In <a href="https://github.com/mlpack/mlpack/pull/664#discussion_r67933244">src/mlpack/core/tree/rectangle_tree/discrete_hilbert_value.hpp</a>:</p>
<pre style='color:#555'>> + arma::Mat<HilbertElemType>*& LocalDataset() { return localDataset; }
> +
> + //! Modify the valueToInsert
> + arma::Col<HilbertElemType>* ValueToInsert() { return valueToInsert; }
> +
> + //! Modify the valueToInsert
> + 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;
</pre>
<p>It may also make sense here to just store localDataset as an <code>arma::Mat<HilbertElemType></code> instead of a pointer to one, and then you wouldn't need <code>ownsLocalDataset</code>. If the goal was to avoid copying the data of another <code>DiscreteHilbertValue</code>'s <code>localDataset</code> object, you could use the move constructor for Armadillo matrices.</p>
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