<p>In <a href="https://github.com/mlpack/mlpack/pull/703#discussion_r68422887">src/mlpack/methods/edge_boxes/feature_extraction_impl.hpp</a>:</p>
<pre style='color:#555'>&gt; +#ifndef MLPACK_METHODS_EDGE_BOXES_STRUCTURED_TREE_ImPL_HPP
&gt; +#define MLPACK_METHODS_EDGE_BOXES_STRUCTURED_TREE_ImPL_HPP
&gt; +
&gt; +
&gt; +#include &quot;feature_extraction.hpp&quot;
&gt; +#include &lt;mlpack/methods/pca/pca.hpp&gt;
&gt; +namespace mlpack {
&gt; +namespace structured_tree {
&gt; +
&gt; +/**
&gt; + * Constructor: stores all the parameters in an object
&gt; + * of feature_parameters class.
&gt; + */
&gt; +template&lt;typename MatType, typename CubeType&gt;
&gt; +StructuredForests&lt;MatType, CubeType&gt;::
&gt; +StructuredForests(FeatureParameters F) 
</pre>
<p>Although this is not std::map, but using initialization list to initialize still a good practice</p>

<p>This is initialize</p>

<p><code>StructuredForests(FeatureParameters F)  : params(F) {}</code></p>

<p>This is assignment</p>

<pre><code>{
  params = F;
}
</code></pre>

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