42         node* next;  member
44              data(t), data2(t2), prev(p), next(n) {}  in node()
69             head=head->next;  in ~Map()
86         tmp = tmp->next;  in find()
101         tmp = tmp->next;  in find_ele()
124         tmp = tmp->next;  in show()
135         tmp = tmp->next;  in size()
146         tail->prev->next = tail;  in insert()
179             tmp = tmp->next;  in erase()
182             tempnode->next = NULL;  in erase()
190             prevnode->next = NULL;  in erase()
199             prevnode->next = tmp->next;  in erase()
200             tmp->next->prev = prevnode->next;  in erase()
207         tmp = tmp->next;  in erase()
221        tempnode->next = NULL;  in eraseall()
222        head = head->next;  in eraseall()