85 class LinkNode {
87   LinkNode() : previous_(nullptr), next_(nullptr) {}  in LinkNode()  function
88   LinkNode(LinkNode<T>* previous, LinkNode<T>* next)  in LinkNode()  function
91   LinkNode(LinkNode<T>&& rhs) {  in LinkNode()  function
106   void InsertBefore(LinkNode<T>* e) {  in InsertBefore()
114   void InsertAfter(LinkNode<T>* e) {  in InsertAfter()
131   LinkNode<T>* previous() const {  in previous()
135   LinkNode<T>* next() const {  in next()
149   LinkNode<T>* previous_;
150   LinkNode<T>* next_;
152   DISALLOW_COPY_AND_ASSIGN(LinkNode);
164   void Append(LinkNode<T>* e) {  in Append()
168   LinkNode<T>* head() const {  in head()
172   LinkNode<T>* tail() const {  in tail()
176   const LinkNode<T>* end() const {  in end()
183   LinkNode<T> root_;