<p>In <a href="https://github.com/mlpack/mlpack/pull/664#discussion_r67961063">src/mlpack/core/tree/rectangle_tree/discrete_hilbert_value_impl.hpp</a>:</p>
<pre style='color:#555'>&gt; +    {
&gt; +      localDataset = NULL;
&gt; +      numValues = 0;
&gt; +    }
&gt; +  }
&gt; +}
&gt; +
&gt; +template&lt;typename TreeElemType&gt;
&gt; +template&lt;typename TreeType&gt;
&gt; +void DiscreteHilbertValue&lt;TreeElemType&gt;::Copy(TreeType* dst, TreeType* src)
&gt; +{
&gt; +  DiscreteHilbertValue&lt;TreeElemType&gt; &amp;dstVal = dst-&gt;AuxiliaryInfo().HilbertValue();
&gt; +  DiscreteHilbertValue&lt;TreeElemType&gt; &amp;srcVal = src-&gt;AuxiliaryInfo().HilbertValue();
&gt; +
&gt; +  dst.LocalDataset() = src.LocalDataset();
&gt; +  dst.NumValues() = src.NumValues();
</pre>
<p>I agree, it is better to use a copy constructor and an operator =.</p>

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