G4ModifiedMidpoint.hh

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// G4ModifiedMidpoint
//
// Class description:
//
// Modified midpoint method implementation, based on Boost odeint

// Author: Dmitry Sorokin, Google Summer of Code 2016
// Supervision: John Apostolakis, CERN
// --------------------------------------------------------------------
#ifndef G4MODIFIED_MIDPOINT_HH
#define G4MODIFIED_MIDPOINT_HH

#include "G4Types.hh"
#include "G4EquationOfMotion.hh"
#include "G4FieldTrack.hh"

class G4ModifiedMidpoint
{
  public:

    G4ModifiedMidpoint( G4EquationOfMotion* equation,
                        G4int nvar = 6, G4int steps = 2 );
   ~G4ModifiedMidpoint() = default;

    void DoStep( const G4double yIn[], const G4double dydxIn[],
                 G4double yOut[], G4double hstep) const;

    void DoStep( const G4double yIn[], const G4double dydxIn[],
                 G4double yOut[], G4double hstep, G4double yMid[],
                 G4double derivs[][G4FieldTrack::ncompSVEC]) const;

    inline void SetSteps(G4int steps);
    inline G4int GetSteps() const;

    inline void SetEquationOfMotion(G4EquationOfMotion* equation);
    inline G4EquationOfMotion* GetEquationOfMotion();

    inline G4int GetNumberOfVariables() const;

  private:

    void copy(G4double dst[], const G4double src[]) const;

  private:

    G4EquationOfMotion* fEquation = nullptr;
    G4int fnvar = 0;
    G4int fsteps = 0;
};

#include "G4ModifiedMidpoint.icc"

#endif