#ifndef __DOUBLYLINKEDLIST_H__ #define __DOUBLYLINKEDLIST_H__ // // #include #include using namespace std;

class DoublyLinkedList { public: DoublyLinkedList(); ~DoublyLinkedList(); void append (const string& s); void insertBefore (const string& s); void insertAfter (const string& s); void remove (const string& s); bool empty(); void begin(); void end(); bool next(); bool prev(); bool find(const string& s); const std::string& getData() const;

private: class Node { public: Node(); Node(const string& data); ~Node(); Node* next; Node* prev; string* data; }; Node* head; Node* tail; Node* current; };

DoublyLinkedList::Node::Node(const string& da)

{ this->data=nullptr; this->next=nullptr; this->prev=nullptr; &da= NULL; } I am getting an error and cannot figure out how to initialize or use da in the function, it has to be passed by reference.