include/my_lib/collection.hh

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#ifndef COLLECTION_HH
#define COLLECTION_HH

#include<list>

namespace my_lib {

        template<typename T>
        struct AbstractIterator {
                virtual bool hasNext() = 0;
                virtual T next() = 0;
                virtual AbstractIterator* clone() const = 0;
        };

        template<typename T, typename Container = std::list<T> >
        struct Collection : private Container {
                void add(const T& t){
                        this->push_back(t);
                }
        
                struct Iterator : AbstractIterator<T> {
                private :
                        const typename Container::iterator end;
                        typename Container::iterator current;
                public :
                        Iterator(Container& c) : current(c.begin()), end(c.end()) {}
                        bool hasNext() {
                                return current != end;
                        }
                        
                        T next() {
                                T& t=*current;
                                current++;
                                return t;
                        }
                        
                        Iterator* clone() const {
                                return new Iterator(*this);
                        }
                };
                
                Iterator iterator(){
                        return Iterator(*this);
                }
        };

        template<typename T>
        struct Iterator{
                private:
                AbstractIterator<T> *it;
                public:
                Iterator() : it(NULL) {}
                Iterator(const AbstractIterator<T>& it) : it(it.clone()) {}
        
                Iterator& operator=(const AbstractIterator<T>& it) {
                        if(this->it!=NULL)
                                delete this->it;
                        this->it = it.clone();
                }
                
                ~Iterator() {
                        if(this->it!=NULL)
                                delete this->it;
                }
                
                
                bool hasNext() {
                        return it->hasNext();
                }
                
                T next() {
                        return it->next();
                }
                
                
        };
        


}//my_lib

#endif COLLECTION_HH