227 struct VertexList {  struct
228     VertexList() : fHead(nullptr), fTail(nullptr) {}  in VertexList()  argument
229     VertexList(Vertex* head, Vertex* tail) : fHead(head), fTail(tail) {}  in VertexList()  argument
230     Vertex* fHead;
231     Vertex* fTail;
232     void insert(Vertex* v, Vertex* prev, Vertex* next) {  in insert()
235     void append(Vertex* v) {  in append()
238     void append(const VertexList& list) {  in append()
250     void prepend(Vertex* v) {  in prepend()
253     void remove(Vertex* v) {  in remove()
256     void close() {  in close()