gradientFlow.h

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#ifndef GRADIENTFLOW_INCLUDED
#define GRADIENTFLOW_INCLUDED

#include "action.h"
#include "staples.h"

#ifdef USE_PARAMETERS_FACTORY
#include "parameters_factory.h"
#endif

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


//- parameters class
class Parameters_GradientFlow : virtual public Parameters
{
 public:
  Parameters_GradientFlow();
};
//- end

class GradientFlow
{
 public:
  static const std::string class_name;

 protected:
  Bridge::VerboseLevel m_vl;

 private:
  int    m_order_RK;
  double m_Estep;
  int    m_Nprec;
  double m_tol_RK, m_safety;
  bool   m_adaptive;

  Action  *m_action;
  Staples m_staple;

  // class family for flow algorithm
  class RungeKutta;

  class RungeKutta_1st;
  class RungeKutta_2nd;
  class RungeKutta_3rd;
  class RungeKutta_4th;

  class AdaptiveRungeKutta;

  RungeKutta *m_impl;

 public:
  GradientFlow(Action *action);

  GradientFlow(unique_ptr<Action>& action);

  ~GradientFlow();

 private:
  // non-copyable
  GradientFlow(const GradientFlow&);
  GradientFlow& operator=(const GradientFlow&);

 public:
  void set_parameters(const Parameters& params);
  void set_parameters(const int order_RK,
                      const double Estep, const int Nprec,
                      const double tol_RK, const double safety,
                      const int is_adaptive);

  void set_parameter_order(const int order, const bool is_adaptive);

  void set_parameter_verboselevel(const Bridge::VerboseLevel vl) { m_vl = vl; }

  void initialize();

  double evolve(double& t_flow, Field_G& U);
};
#endif