37     struct node  struct
41         node* prev;  argument
42         node* next;  argument
43         node(T t, T2 t2,node* p, node* n) :  in node()  argument
46     node* head;
47     node* tail;
48     node* tmp;
68             node* temp(head);  in ~Map()
144     tail = new node(data, data2,tail, NULL);  in insert()
162     node* prevnode = tmp;  in erase()
163     node *tempnode;  in erase()
216     node *tempnode;  in eraseall()