<p>In <a href="https://github.com/mlpack/mlpack/pull/664#discussion_r67956995">src/mlpack/core/tree/rectangle_tree/discrete_hilbert_value.hpp</a>:</p>
<pre style='color:#555'>&gt; + private:
&gt; +  //! The number of bits that we can store
&gt; +  static constexpr size_t order = sizeof(HilbertElemType) * CHAR_BIT;
&gt; +  //! The local dataset
&gt; +  arma::Mat&lt;HilbertElemType&gt;* localDataset;
&gt; +  //! Indicates that the node owns the local dataset
&gt; +  bool ownsLocalDataset;
&gt; +  //! The number of values in the local dataset
&gt; +  size_t numValues;
&gt; +  //! The Hilbert value of the point that is being inserted
&gt; +  arma::Col&lt;HilbertElemType&gt;* valueToInsert;
&gt; +  //! Indicates that the node owns the valueToInsert 
&gt; +  bool ownsValueToInsert;
&gt; +
&gt; +  /**
&gt; +   * Returns true if the node has the largest Hilbert value.
</pre>
<p>I wrote this method when I used an iterator as a pointer to the largest Hilbert value. That was quite complex.</p>

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