149     Slice prefix;  in Next()  local
152       prefix = prefix_.GetUserKey();  in Next()
155                       prefix_same_as_start_ ? &prefix : nullptr);  in Next()
179 bool DBIter::FindNextUserEntry(bool skipping_saved_key, const Slice* prefix) {  in FindNextUserEntry()  argument
181   return FindNextUserEntryInternal(skipping_saved_key, prefix);  in FindNextUserEntry()
186                                        const Slice* prefix) {  in FindNextUserEntryInternal()  argument
236     assert(prefix == nullptr || prefix_extractor_ != nullptr);  in FindNextUserEntryInternal()
237     if (prefix != nullptr &&  in FindNextUserEntryInternal()
238         prefix_extractor_->Transform(ikey_.user_key).compare(*prefix) != 0) {  in FindNextUserEntryInternal()
571     Slice prefix;  in Prev()  local
574       prefix = prefix_.GetUserKey();  in Prev()
576     PrevInternal(prefix_same_as_start_ ? &prefix : nullptr);  in Prev()
655 void DBIter::PrevInternal(const Slice* prefix) {  in PrevInternal()  argument
661     assert(prefix == nullptr || prefix_extractor_ != nullptr);  in PrevInternal()
662     if (prefix != nullptr &&  in PrevInternal()
664                 .compare(*prefix) != 0) {  in PrevInternal()