[C++] 이중 연결 리스트 자료구조

#pragma once class linkedlistnode { public: int data; linkedlistnode* next; linkedlistnode* previous; linkedlistnode(int data, linkedlistnode* next, linkedlistnode* previous) { this->data = data; this->next = next; this->previous = previous; } }; class linkedlist { private: //const linkedlistnode* endnode = new linkedlistnode(0, nullptr); linkedlistnode* _begin; linkedlistnode* _end; int _count; public: class linkedlistiterator { private: linkedlistnode* current; friend class linkedlist; public:...