//
// ********************************************************************
// * DISCLAIMER                                                       *
// *                                                                  *
// * The following disclaimer summarizes all the specific disclaimers *
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//
//
// $Id: G4StackChecker.hh,v 1.1 2003/06/12 15:14:43 vnivanch Exp $
// GEANT4 tag $Name: geant4-08-00 $
//

#ifndef G4StackChecker_h
#define G4StackChecker_h 1

#include "G4UserStackingAction.hh"
#include "G4ClassificationOfNewTrack.hh"
#include "G4ThreeVector.hh"

// class description:
//
//  This is the UserStackingAction for removing unreasonable tracks.
//

class G4Track;

class G4StackChecker  : public G4UserStackingAction
{
public:
  G4StackChecker();
  virtual ~G4StackChecker();

public: // with description

  virtual G4ClassificationOfNewTrack
        ClassifyNewTrack(const G4Track* track);

  virtual void NewStage() {};
  virtual void PrepareNewEvent() {};

private:

  G4ThreeVector nullDirection;

};

#endif