Method Ref

src/leveldb/util/cache.cc:217–223

}

void LRUCache::Ref(LRUHandle* e) {
  if (e->refs == 1 && e->in_cache) {  // If on lru_ list, move to in_use_ list.
    LRU_Remove(e);
    LRU_Append(&in_use_, e);
  }
  e->refs++;
}

void LRUCache::Unref(LRUHandle* e) {
  assert(e->refs > 0);