#ifndef STACK_H
#define STACK_H	

#include "complex.h"
typedef float TPELEM;
//#define _complex_
//typedef Complex TPELEM;

#include "stack-iterator.h"

class Stack {  // Classe Abstrata !!!
public:
	enum TpStack {
		STACK_CE,
		STACK_LE
	}; 
	virtual void    push(TPELEM) = 0; // abstract method ... 
	virtual TPELEM  pop()     = 0;    // Late binding !!!
	virtual bool    isEmpty() = 0;
	virtual bool    isFull()  = 0;
	virtual TPELEM  top()     = 0;

	virtual StackIterator *iterator() = 0;

	// Factory Method para construcao de Stack
	static Stack *create(TpStack); // factory method
};

#endif