class doublyLinkedList
{
protected:
    double_node *head, *tail;
    int length;
public:
    ///constructor
    doublyLinkedList()
    {
        this->head = NULL;
        this->tail = NULL;
        this->length = 0;
    }
    doublyLinkedList(double_node *head, double_node* tail, int length)
    {
        this->head = new double_node;
        this->tail = new double_node;
        this->head = head;
        this->tail = tail;
        this->length = length;
    }
    ///destructor
    ~doublyLinkedList()
    {
        double_node *current = head;
        while ( current != tail ){
            double_node* next =  current->get_next();
            delete current;
            current = next;
        }
        delete tail;
    }

    ///operator=
    doublyLinkedList operator=(doublyLinkedList& lista)
    {
        double_node*  nod1 = lista.head;
        double_node*  nod2 = head;
        cout<<"0";
        ///tentativa mea
        if(lista.head != NULL)
        {
            cout<<"1";
            this->head = lista.head;
            cout<<"2";
            double_node*  nod1 = lista.head;
            cout<<"3";
            double_node*  nod2 = head;
            cout<<"4";
            while(nod2 != lista.tail)
            {
                cout<<"5";
               nod1 = (double_node*) nod1->get_next();
                cout<<"6";
                nod2 = (double_node*) nod2->get_next();
                cout<<"7";
            }
            tail = lista.tail;
            length = lista.length;
            this->length = lista.length;
        }
        return (*this);
    }