<p>In <a href="https://github.com/mlpack/mlpack/pull/664#discussion_r67792463">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>For example</p>

<pre><code>    TreeType* copy = new TreeType(*tree, false);
    copy-&gt;Parent() = tree;
    tree-&gt;Count() = 0;
    tree-&gt;NullifyData();
</code></pre>

<p>As for me this code looks weird, maybe something like std::move is better?</p>

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