/**
 * @file parameters_visitor_impl.hpp
 * @author Marcus Edel
 *
 * Implementation of the Parameters() function layer abstraction.
 *
 * mlpack is free software; you may redistribute it and/or modify it under the
 * terms of the 3-clause BSD license.  You should have received a copy of the
 * 3-clause BSD license along with mlpack.  If not, see
 * http://www.opensource.org/licenses/BSD-3-Clause for more information.
 */
#ifndef MLPACK_METHODS_ANN_VISITOR_PARAMETERS_VISITOR_IMPL_HPP
#define MLPACK_METHODS_ANN_VISITOR_PARAMETERS_VISITOR_IMPL_HPP

// In case it hasn't been included yet.
#include "parameters_visitor.hpp"

namespace mlpack {
namespace ann {

//! ParametersVisitor visitor class.
inline ParametersVisitor::ParametersVisitor(arma::mat&& parameters) :
    parameters(std::move(parameters))
{
  /* Nothing to do here. */
}

template<typename LayerType>
inline void ParametersVisitor::operator()(LayerType *layer) const
{
  LayerParameters(layer, layer->OutputParameter());
}

inline void ParametersVisitor::operator()(MoreTypes layer) const
{
  layer.apply_visitor(*this);
}

template<typename T, typename P>
inline typename std::enable_if<
    !HasParametersCheck<T, P&(T::*)()>::value, void>::type
ParametersVisitor::LayerParameters(T* /* layer */, P& /* output */) const
{
  /* Nothing to do here. */
}

template<typename T, typename P>
inline typename std::enable_if<
    HasParametersCheck<T, P&(T::*)()>::value, void>::type
ParametersVisitor::LayerParameters(T* layer, P& /* output */) const
{
  parameters = layer->Parameters();
}

} // namespace ann
} // namespace mlpack

#endif
