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/* File: stack.h 
 * Desc: interface of a stack ADT using an opaque type. 
 * Cristina Cifuentes 
 * 13 Aug 1997 
 */ 
 
#ifndef _STACK_H_ 
#define _STACK_H_ 
 
typedef struct _Stack *Stack; 
 
Stack	stackNew (void); 
int	stackEmpty (Stack); 
void	stackPush (Stack, void *); 
void   *stackPop (Stack); 
void    stackFree (Stack *); 
 
#endif