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// ********************************************************************
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//
//  Last Modification : 09/Dec/96 M.Asai
//


#ifndef G4TrackStack_h
#define G4TrackStack_h 1

#include "G4StackedTrack.hh"
#include "G4Types.hh"
#include <vector>

class G4SmartTrackStack;

// 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 std::vector<G4StackedTrack>
{
public:
	G4TrackStack() : safetyValve1(0), safetyValve2(0), nstick(0) {}
  G4TrackStack(size_t n) : safetyValve1(4*n/5), safetyValve2(4*n/5-100), nstick(100) { reserve(n);}
  ~G4TrackStack();
  
private:
	const G4TrackStack & operator=(const G4TrackStack &right);
	G4bool operator==(const G4TrackStack &right) const;
	G4bool operator!=(const G4TrackStack &right) const;
  
public:
	void PushToStack(const G4StackedTrack& aStackedTrack) { push_back(aStackedTrack); }
	G4StackedTrack PopFromStack() { G4StackedTrack st = back(); pop_back(); return st; }
	void TransferTo(G4TrackStack* aStack);
	void TransferTo(G4SmartTrackStack* aStack);
  
        void clearAndDestroy();
private:
	G4int safetyValve1;
  G4int safetyValve2;
	G4int nstick;
  
public:
	G4int GetNTrack() const { return size(); }
	G4int GetMaxNTrack() const { return max_size(); }
  inline G4int GetSafetyValve1() const { return safetyValve1; }
	inline G4int GetSafetyValve2() const { return safetyValve2; }
	inline G4int GetNStick() const { return nstick; }
  
	G4double getTotalEnergy(void) const;
	void SetSafetyValve2(int x) { safetyValve2 = x  < 0 ? 0 : x; }
  
};

#endif
