integrator_Omelyan.h

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#ifndef INTEGRATOR_OMELYAN_INCLUDED
#define INTEGRATOR_OMELYAN_INCLUDED
 
#include "integrator.h"
 
#include "IO/bridgeIO.h"
using Bridge::vout;
 
 
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(const int level, const int Nstep, const 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 get_parameters(Parameters& params) const;
 
  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