<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'>> +#ifndef MLPACK_METHODS_EDGE_BOXES_STRUCTURED_TREE_ImPL_HPP
> +#define MLPACK_METHODS_EDGE_BOXES_STRUCTURED_TREE_ImPL_HPP
> +
> +
> +#include "feature_extraction.hpp"
> +#include <mlpack/methods/pca/pca.hpp>
> +namespace mlpack {
> +namespace structured_tree {
> +
> +/**
> + * Constructor: stores all the parameters in an object
> + * of feature_parameters class.
> + */
> +template<typename MatType, typename CubeType>
> +StructuredForests<MatType, CubeType>::
> +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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