force_F_Rational.h

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#ifndef FORCE_F_RATIONAL_INCLUDED
#define FORCE_F_RATIONAL_INCLUDED

#include "force_F.h"
#include "Fopr/fopr_Rational.h"
#include "Tools/math_Rational.h"
#include "Field/field_F.h"

#include "IO/bridgeIO.h"
using Bridge::vout;


class Force_F_Rational : public Force
{
 public:
  static const std::string class_name;

 private:
  int    m_Np;             // number of poles in rational approx.
  int    m_n_exp, m_d_exp; // numerator and denominator of the exponent
  double m_x_min, m_x_max; // valid range of approximate sign function
  int    m_Niter;          // max iteration of shiftsolver
  double m_Stop_cond;      // stopping condition of shift solver

  Field_G *m_U;
  Fopr    *m_fopr;
  Force   *m_force;

  // rational approx. coefficients
  double              m_a0;
  std::vector<double> m_bl;
  std::vector<double> m_cl;

 public:
  Force_F_Rational(Fopr *fopr, Force *force)
    : Force(), m_fopr(fopr), m_force(force) {}

  Force_F_Rational(unique_ptr<Fopr>& fopr, unique_ptr<Force>& force)
    : Force(), m_fopr(fopr.get()), m_force(force.get()) {}

  ~Force_F_Rational() {}

  void set_parameters(const Parameters& params);
  void set_parameters(int Np, int n_exp, int d_exp, double x_min, double x_max,
                      int Niter, double Stop_cond);

  void set_config(Field *U)
  {
    m_U = (Field_G *)U;
    m_fopr->set_config(U);
    m_force->set_config(U);
  }

  void force_udiv(Field&, const Field&);

  void force_core1(Field&, const Field&, const Field&);  // dummy entry
  void force_udiv1(Field&, const Field&, const Field&);  // dummy entry

 private:
  void force_udiv_impl(Field_G&, const Field_F&);
};
#endif