hmc_Leapfrog.h

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#ifndef HMC_LEAPFROG_INCLUDED
#define HMC_LEAPFROG_INCLUDED

#include "action_list.h"
#include "integrator.h"
#include "langevin_Momentum.h"

#include "Measurements/Gauge/staple_lex.h"

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


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

 private:
  int m_Nmdc;
  int m_Nprec;
  bool m_Metropolis_test;
  double m_Estep;

  Langevin_Momentum *m_Langevin_P;
  Staple_lex *m_staple;

  std::vector<Action *> m_action;
  std::vector<Director *> m_director;
  RandomNumbers *m_rand;
  Bridge::VerboseLevel m_vl;

 public:

  HMC_Leapfrog(std::vector<Action *> action,
               RandomNumbers *rand);

  HMC_Leapfrog(std::vector<Action *> action,
               unique_ptr<RandomNumbers>& rand);

  HMC_Leapfrog(std::vector<Action *> action,
               std::vector<Director *> director,
               RandomNumbers *rand);

  HMC_Leapfrog(std::vector<Action *> action,
               std::vector<Director *> director,
               unique_ptr<RandomNumbers>& rand);

  HMC_Leapfrog(const ActionList& action_list,
               RandomNumbers *rand);

  HMC_Leapfrog(const ActionList& action_list,
               unique_ptr<RandomNumbers>& rand);

  HMC_Leapfrog(const ActionList& action_list,
               std::vector<Director *> director,
               RandomNumbers *rand);

  HMC_Leapfrog(const ActionList& action_list,
               std::vector<Director *> director,
               unique_ptr<RandomNumbers>& rand);

  ~HMC_Leapfrog();

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

 public:
  void set_parameters(const Parameters& params);
  void set_parameters(const double Estep, const int Nmdc, const int Nprec, const int Metropolis_test);  // backward compability
  void set_parameters(const double Estep, const int Nmdc, const int Nprec, const bool Metropolis_test);

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

  //  Metropolis_test: enabled if true.
  double update(Field_G&);

  double langevin(Field_G& iP, const Field_G& U);

  double calc_Hamiltonian(const Field_G& iP, const Field_G& U);
  double calcH_P(const Field_G& iP);

  void integrate(Field_G& iP, Field_G& U);

  void update_U(const double estep, const Field_G& iP, Field_G& U);
  void update_P(const double estep, Field_G& iP, const Field_G& U);
};
#endif