<p>In <a href="https://github.com/mlpack/mlpack/pull/693#discussion_r66861620">src/mlpack/methods/neighbor_search/ns_model.hpp</a>:</p>
<pre style='color:#555'>&gt; +{
&gt; + private:
&gt; +   const size_t k;
&gt; +   arma::Mat&lt;size_t&gt;&amp; neighbors;
&gt; +   arma::mat&amp; distances;
&gt; +
&gt; + public:
&gt; +   template&lt;typename NSType&gt;
&gt; +   void operator()(NSType *ns) const;
&gt; +
&gt; +   SearchKVisitor(const size_t k,
&gt; +                  arma::Mat&lt;size_t&gt;&amp; neighbors,
&gt; +                  arma::mat&amp; distances);
&gt; +};
&gt; +
&gt; +class SearchVisitor : public boost::static_visitor&lt;void&gt;
</pre>
<p>Ok, I agree. I will change this.</p>

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