<p>In <a href="https://github.com/mlpack/mlpack/pull/696#discussion_r67095442">src/mlpack/methods/edge_boxes/feature_extraction.hpp</a>:</p>
<pre style='color:#555'>&gt; +
&gt; +namespace mlpack {
&gt; +namespace structured_tree {
&gt; +
&gt; +template &lt;typename MatType = arma::mat, typename CubeType = arma::cube&gt;
&gt; +class StructuredForests
&gt; +{
&gt; +
&gt; + public:
&gt; +
&gt; +  static constexpr double eps = 1e-20;
&gt; +
&gt; +  std::map&lt;std::string, size_t&gt; options;
&gt; +  
&gt; +  StructuredForests(const std::map&lt;std::string, size_t&gt; inMap);
&gt; +  
</pre>
<p>Tham suggested the same. I'll do it using member functions.</p>

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