VirtualIterator.h

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#ifndef _ITER_H_
#define _ITER_H_

template < class T > class _Iter {
      protected:
        int _type;

      public:
        virtual ~ _Iter() {
        };
        virtual _Iter *clone() = 0;
        virtual T *get() = 0;
        virtual void next() = 0;
        virtual bool equals(_Iter * i2) = 0;
};

template < class T > class Iter {
      private:
        _Iter < T > *iter;

      Iter():iter(NULL) {
        }
      public:
      Iter(_Iter < T > *iiter):iter(iiter) {
        }
        ~Iter() {
                delete iter;
        }

        Iter(const Iter & i2) {
                iter = i2.iter->clone();
        }

        Iter & operator=(const Iter & i2) {
                delete iter;
                iter = i2.iter->clone();
        }

        T operator*() {
                return *iter->get();
        }

        T *operator->() {
                return iter->get();
        }

        Iter & operator++() {   //prefix
                iter->next();
                return *this;
        }

        Iter operator++(int) {  //postfix
                Iter curr(*this);
                iter->next();
                return curr;
        }

        bool operator==(const Iter & i2) {
                return iter->equals(i2.iter);
        }

        bool operator!=(const Iter & i2) {
                return !iter->equals(i2.iter);
        }
};

#endif

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