// This code implementation is the intellectual property of
// the GEANT4 collaboration.
//
// By copying, distributing or modifying the Program (or any work
// based on the Program) you indicate your acceptance of this statement,
// and all its terms.
//
// $Id: G4TrackStack.hh,v 1.3 1999/12/15 14:49:39 gunter Exp $
// GEANT4 tag $Name: geant4-03-00 $
//
//
//  Last Modification : 09/Dec/96 M.Asai
//


#ifndef G4TrackStack_h
#define G4TrackStack_h 1

#include "G4StackedTrack.hh"
#include "globals.hh"

// class description:
//
//  This is a stack class used by G4StackManager. This class object
// stores G4StackedTrack class objects in the form of bi-directional
// linked list.

class G4TrackStack 
{
  public:
      G4TrackStack();
      ~G4TrackStack();

  private:
      const G4TrackStack & operator=
                          (const G4TrackStack &right);
      int operator==(const G4TrackStack &right) const;
      int operator!=(const G4TrackStack &right) const;

  public:
      void PushToStack(G4StackedTrack * aStackedTrack);
      G4StackedTrack * PopFromStack();
      void GrabFromStack(G4StackedTrack * aStackedTrack);
      void clear();
      void TransferTo(G4TrackStack * aStack);

  private:
      G4int n_stackedTrack;
      G4StackedTrack * firstStackedTrack;
      G4StackedTrack * lastStackedTrack;

  public:
      inline G4int GetNTrack() const
      { return n_stackedTrack; }
};

#endif