<p>In <a href="https://github.com/mlpack/mlpack/pull/708#discussion_r71900189">src/mlpack/core/tree/vantage_point_tree/dual_tree_traverser_impl.hpp</a>:</p>
<pre style='color:#555'>&gt; +  }
&gt; +}
&gt; +
&gt; +template&lt;typename MetricType,
&gt; +         typename StatisticType,
&gt; +         typename MatType,
&gt; +         template&lt;typename BoundMetricType, typename...&gt; class BoundType,
&gt; +         template&lt;typename SplitBoundType, typename SplitMatType&gt;
&gt; +             class SplitType&gt;
&gt; +template&lt;typename RuleType&gt;
&gt; +void VantagePointTree&lt;MetricType, StatisticType, MatType, BoundType, SplitType&gt;::
&gt; +DualTreeTraverser&lt;RuleType&gt;::Traverse(
&gt; +    const size_t queryIndex,
&gt; +    VantagePointTree&lt;MetricType, StatisticType, MatType, BoundType, SplitType&gt;&amp;
&gt; +        referenceNode)
&gt; +{
</pre>
<p>Would it be possible to use the <code>SingleTreeTraverser</code> here, or possibly to merge both the <code>DualTreeTraverser</code> and <code>SingleTreeTraverser</code> into a single class?</p>

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