#ifndef STACK
#define STACK

typedef int DataT;
struct StackNodeT;

class StackT {
   public:
       StackT();
       StackT(const StackT & other);

       ~StackT();
       StackT & operator =(const StackT & other);

       void Push(DataT d);
       void Pop(void);
       DataT Top(void) const;

       size_t Size(void) const;

       bool IsEmpty(void) const;

   private:
       size_t size;
       StackNodeT * stack;
};

#endif