<p>In <a href="https://github.com/mlpack/mlpack/pull/747#discussion_r74709312">src/mlpack/tests/knn_test.cpp</a>:</p>
<pre style='color:#555'>&gt; +    arma::Mat&lt;size_t&gt; neighborsSPTree;
&gt; +    arma::mat distancesSPTree;
&gt; +
&gt; +    for (size_t mode = 0; mode &lt; 2; mode++)
&gt; +    {
&gt; +      switch (mode)
&gt; +      {
&gt; +        case 0: // Single Tree Search.
&gt; +          spTreeSearch.Naive() = false;
&gt; +          spTreeSearch.SingleMode() = true;
&gt; +          break;
&gt; +        case 1: // Dual Tree Search.
&gt; +          spTreeSearch.Naive() = false;
&gt; +          spTreeSearch.SingleMode() = false;
&gt; +          break;
&gt; +      }
</pre>
<p>You could simplify:</p>

<pre><code>spTreeSearch.SingleMode() = (mode == 0);
</code></pre>

<p>I don't think setting <code>Naive()</code> is necessary.</p>

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