10. doubly-linked-list

Dlistnode class class doublylinkedlist class

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DListNode Class class DoublyLinkedList; // class declaration class DListNode { private : int obj; DListNode * prev, * next; friend class DoublyLinkedList; public : DListNode( int e=0, DListNode * p = NULL, DListNode * n = NULL) : obj(e), prev(p), next(n) {} int getElem() const { return obj; } DListNode * getNext() const { return next; } DListNode * getPrev() const { return prev; } }; c circlecopyrt Teresa Leyk Slide 2 Doubly Linked List
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CPSC 221 Data Structures & Algorithms DoublyLinkedList Class class DoublyLinkedList { protected : DListNode header, trailer; public : DoublyLinkedList() : header(0), trailer(0) { header.next = &trailer; trailer.prev = &header; } ~DoublyLinkedList(); DListNode * getFirst() const { return header.next; } DListNode * getAfterLast() { return &trailer; } bool isEmpty() const { return header.next == &trailer; } int first() const throw (EmptyDLinkedListException); int last() const trow(EmptyDLinkedListException); void insertFirst( int newobj); int removeFirst() throw (EmptyDLinkedListException); void insertLast( int newobj); int removeLast() throw (EmptyDLinkedListException); }; c circlecopyrt Teresa Leyk Slide 3 Doubly Linked List
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CPSC 221 Data Structures & Algorithms DoublyLinkedList Class Implementation void DoublyLinkedList::insertFirst( int newobj) { DListNode * newNode = new DListNode(newobj, &header, header.next); header.next->prev = newNode; header.next = newNode; } newNode header trailer c circlecopyrt Teresa Leyk Slide 4 Doubly Linked List
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CPSC 221
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