#pragma once
#include "Aggregate.h"

class Iterator {
public:
 Iterator();
 virtual ~Iterator();
 virtual void First() = 0;
 virtual void Next() = 0;
 virtual bool IsDone() = 0;
 virtual Object CurrentItem() = 0;
};

class ConcreteIterator :public Iterator {
public:
 ConcreteIterator(Aggregate *ag, int idx /* = 0 */);

 void First();
 void Next();
 bool IsDone();
 Object CurrentItem();
private:
 Aggregate* _ag;
 int _idx;
};