<p>In <a href="https://github.com/mlpack/mlpack/pull/664#discussion_r67791456">src/mlpack/core/tree/rectangle_tree/discrete_hilbert_value_impl.hpp</a>:</p>
<pre style='color:#555'>&gt; +    ownsLocalDataset = true;
&gt; +  }
&gt; +    
&gt; +  if (ownsLocalDataset)
&gt; +  {
&gt; +    localDataset =  new arma::Mat&lt;HilbertElemType&gt;(tree-&gt;Dataset().n_rows,
&gt; +                                            tree-&gt;MaxLeafSize() + 1);
&gt; +  }
&gt; +
&gt; +}
&gt; +
&gt; +template&lt;typename TreeElemType&gt;
&gt; +DiscreteHilbertValue&lt;TreeElemType&gt;::
&gt; +DiscreteHilbertValue(const DiscreteHilbertValue&amp; other) :
&gt; +    localDataset(const_cast&lt;arma::Mat&lt;HilbertElemType&gt;*&gt;(other.LocalDataset())),
&gt; +    ownsLocalDataset(other.ownsLocalDataset),
</pre>
<p>You're right, this is not a valid copy-constructor. But this it exactly the same as the RectangleTree copy constructor. You should invoke NullifyData().</p>

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