28 struct IntrusiveList {  struct
29   friend class Iterator;
31   void clear() {  in clear()
36   bool empty() const { return size_ == 0; }  in empty()
37   uptr size() const { return size_; }  in size()
39   void push_back(Item *x) {  in push_back()
52   void push_front(Item *x) {  in push_front()
64   void pop_front() {  in pop_front()
88   void append_front(IntrusiveList<Item> *l) {  in append_front()  argument
102   void append_back(IntrusiveList<Item> *l) {  in append_back()  argument
116   void CheckConsistency() {  in CheckConsistency()
134     explicit IteratorBase(ItemTy *current) : current_(current) {}  in IteratorBase()
149   typedef IteratorBase<Item> Iterator;
150   typedef IteratorBase<const Item> ConstIterator;
152   Iterator begin() { return Iterator(first_); }  in begin()
153   Iterator end() { return Iterator(0); }  in end()
155   ConstIterator begin() const { return ConstIterator(first_); }  in begin()
156   ConstIterator end() const { return ConstIterator(0); }  in end()
159   uptr size_;
160   Item *first_;
161   Item *last_;