36     SkPtrWrapper<ClassName> fPrev;                                  \
58         T* prev = entry->fPrev;  in remove()
67             next->fPrev = prev;  in remove()
72         entry->fPrev = nullptr;  in remove()
81         SkASSERT(nullptr == entry->fPrev && nullptr == entry->fNext);  in addToHead()
84         entry->fPrev = nullptr;  in addToHead()
87             fHead->fPrev = entry;  in addToHead()
100         SkASSERT(nullptr == entry->fPrev && nullptr == entry->fNext);  in addToTail()
103         entry->fPrev = fTail;  in addToTail()
133         T* prev = existingEntry->fPrev;  in addBefore()
134         existingEntry->fPrev = newEntry;  in addBefore()
135         newEntry->fPrev = prev;  in addBefore()
161         newEntry->fPrev = existingEntry;  in addAfter()
169             next->fPrev = newEntry;  in addAfter()
181         list.fHead->fPrev = fTail;  in concat()
183             SkASSERT(!list.fHead->fPrev);  in concat()
250             fCurr = fCurr->fPrev;  in prev()
279             if (nullptr == item->fPrev) {  in validate()
282                 SkASSERT(item->fPrev->fNext == item);  in validate()
287                 SkASSERT(item->fNext->fPrev == item);  in validate()