G4ModifiedMidpoint.hh

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// $Id: $
//
//
// Description:
//    Modified midpoint method implementation
//    Implementation is based on modified_midpoint.hpp from boost odeint

//    Implementation by Dmitry Sorokin - GSoC 2016
//       Work supported by Google as part of Google Summer of Code 2016.
//    Supervision / code review: John Apostolakis
//

#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;
    G4int fnvar;
    G4int fsteps;
};

#include "G4ModifiedMidpoint.icc"

#endif