<p>In <a href="https://github.com/mlpack/mlpack/pull/747#discussion_r75183449">src/mlpack/core/tree/spill_tree/spill_tree_impl.hpp</a>:</p>
<pre style='color:#555'>&gt; +    right(NULL),
&gt; +    parent(NULL),
&gt; +    count(0),
&gt; +    pointsIndex(NULL),
&gt; +    overlappingNode(false),
&gt; +    hyperplane(),
&gt; +    bound(data.n_rows),
&gt; +    parentDistance(0), // Parent distance for the root is 0: it has no parent.
&gt; +    dataset(&amp;data),
&gt; +    localDataset(false)
&gt; +{
&gt; +  arma::Col&lt;size_t&gt; points;
&gt; +  if (dataset-&gt;n_cols &gt; 0)
&gt; +    // Fill points with all possible indexes: 0 .. (dataset-&gt;n_cols - 1).
&gt; +    points = arma::linspace&lt;arma::Col&lt;size_t&gt;&gt;(0, dataset-&gt;n_cols - 1,
&gt; +        dataset-&gt;n_cols);
</pre>
<p>I see, <code>regspace()</code> was introduced in 6.700, so let's not worry about that now.  Maybe someday when the minimum supported Armadillo version is that or higher we can make all the changes, but it is too much work to backport it for such a minor reason.</p>

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