integrator_Omelyan.h

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#ifndef INTEGRATOR_OMELYAN_INCLUDED
#define INTEGRATOR_OMELYAN_INCLUDED

#include "action.h"
#include "director.h"
#include "randomNumbers.h"
#include "integrator.h"

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


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

class Integrator_Omelyan : public Integrator
{
 public:
  static const std::string class_name;

 private:
  int    m_level;          // level number
  int    m_Nstep;          // number of steps
  double m_lambda;         // Omelyan's optimized parameter

  Integrator *m_update_p;  // momentum updator
  Integrator *m_update_u;  // link variable updator or next level integrator

 public:

  Integrator_Omelyan(Integrator *update_p, Integrator *update_u)
    : m_level(0), m_Nstep(0),
      m_lambda(0.0),
      m_update_p(update_p), m_update_u(update_u)
  {
  }

  ~Integrator_Omelyan() {}

  void set_parameters(const Parameters& params);
  void set_parameters(int level, int Nstep, double lambda_Omelyan);

  void set_parameter_level(const int level);

  void set_parameter_nstep(const int nstep);
  void set_parameter_nsteps(const std::vector<int>& nsteps);

  void set_parameter_lambda(const double lambda_omelyan);

  void evolve(const double step_size, Field_G& iP, Field_G& U);

  // cache management
  void invalidate_cache()
  {
    m_update_p->invalidate_cache();
    m_update_u->invalidate_cache();
  }
};
#endif