// This is core/vnl/vnl_least_squares_cost_function.h
#ifndef vnl_least_squares_cost_function_h_
#define vnl_least_squares_cost_function_h_
//:
// \file
// \brief vnl_least_squares_function -> vnl_cost_function adaptor
// \author Andrew W. Fitzgibbon, Oxford RRG
// \date   20 Aug 99
//
// \verbatim
//  Modifications
//   990820 AWF Initial version.
//   LSB (Manchester) 23/3/01 Tidied documentation
// \endverbatim
//
//-----------------------------------------------------------------------------

#include <vnl/vnl_cost_function.h>
#include <vnl/vnl_least_squares_function.h>
#include "vnl/vnl_export.h"

//: An adaptor that converts a vnl_least_squares_function to a vnl_cost_function
class VNL_EXPORT vnl_least_squares_cost_function : public vnl_cost_function
{
 public:
  vnl_least_squares_cost_function(vnl_least_squares_function* f);

  double f(const vnl_vector<double>& x) override;

  void gradf(const vnl_vector<double>& x, vnl_vector<double>& gradient) override;

 protected:
  vnl_vector<double> storage_;
  vnl_matrix<double> jacobian_;
  vnl_least_squares_function* f_;
};

#endif // vnl_least_squares_cost_function_h_
