//
// ********************************************************************
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//
// $Id: G4ParallelStepper.hh,v 1.3 2002/04/10 13:13:06 dressel Exp $
// GEANT4 tag $Name: geant4-04-01 $
//
// ----------------------------------------------------------------------
// Class G4ParallelStepper
//
// Class description:
//
// Used internally by importance sampling and scoring in a "parallel"
// geometry. (See G4VParallelStepper.hh)

// Author: Michael Dressel (Michael.Dressel@cern.ch)
// ----------------------------------------------------------------------
#ifndef G4ParallelStepper_hh
#define G4ParallelStepper_hh G4ParallelStepper_hh

#include "G4VParallelStepper.hh"
#include "G4PStep.hh"

class G4ParallelStepper : public G4VParallelStepper
{

public:  // with description

  G4ParallelStepper();
    // imitilisation

  ~G4ParallelStepper();
    // delete G4Pstep if created

  G4ParallelStepper(const G4ParallelStepper &);
    // create new G4PStep

  G4ParallelStepper &operator=(const G4ParallelStepper &);
    // create new G4PStep

  G4PStep GetPStep() const {return *fPStep;}
    // get the current G4PStep
  
  void Init(const G4PTouchableKey &aptk);
    // initialise the parallel stepper and the G4PStep
    // pre and post G4PTouchableKey of the step are set equal

  void Update(const G4PTouchableKey &aptk);
    // to be called when crossing a boundary of the 
    // "parallel" geometry to update the G4PStep

  void UnSetCrossBoundary();
    // to be called to unset the fCrossBoundary member of the G4PStep

private:

  void Error(const G4String &m);

private:

  G4PStep *fPStep;
};

#endif