22   explicit LRUElement() : next_(nullptr), prev_(nullptr), refs_(0) {}  in LRUElement()
26   T* next_;  member
47     assert(!t->next_);  in Push()
54     assert(!tail_ || !tail_->next_);  in Push()
56     t->next_ = head_;  in Push()
78     assert(!tail_->next_);  in Pop()
83       t = t->next_;  in Pop()
120     assert(t->next_ || tail_ == t);  in UnlinkImpl()
123       t->prev_->next_ = t->next_;  in UnlinkImpl()
125     if (t->next_) {  in UnlinkImpl()
126       t->next_->prev_ = t->prev_;  in UnlinkImpl()
133       head_ = head_->next_;  in UnlinkImpl()
136     t->next_ = t->prev_ = nullptr;  in UnlinkImpl()
147     assert(!t->next_);  in PushBackImpl()
154     assert(!tail_ || !tail_->next_);  in PushBackImpl()
158       tail_->next_ = t;  in PushBackImpl()