213       current_(nullptr),  in ForwardIterator()
475   } else if (current_ && current_ != mutable_iter_) {  in SeekInternal()
477     immutable_min_heap_.push(current_);  in SeekInternal()
502   } else if (current_ != mutable_iter_) {  in Next()
509               .compare(prefix_extractor_->Transform(current_->key())) == 0;  in Next()
516       prev_key_.SetInternalKey(current_->key());  in Next()
522   current_->Next();  in Next()
523   if (current_ != mutable_iter_) {  in Next()
524     if (!current_->status().ok()) {  in Next()
525       immutable_status_ = current_->status();  in Next()
526     } else if ((current_->Valid()) && (!IsOverUpperBound(current_->key()))) {  in Next()
527       immutable_min_heap_.push(current_);  in Next()
529       if ((current_->Valid()) && (IsOverUpperBound(current_->key()))) {  in Next()
532         current_ = nullptr;  in Next()
545   return current_->key();  in key()
550   return current_->value();  in value()
608          current_->IsKeyPinned();  in IsKeyPinned()
613          current_->IsValuePinned();  in IsValuePinned()
661   current_ = nullptr;  in RebuildIterators()
749   current_ = nullptr;  in RenewIterators()
809   current_ = nullptr;  in ResetIncompleteIterators()
815     current_ = nullptr;  in UpdateCurrent()
817     current_ = mutable_iter_;  in UpdateCurrent()
819     current_ = immutable_min_heap_.top();  in UpdateCurrent()
822     current_ = immutable_min_heap_.top();  in UpdateCurrent()
823     assert(current_ != nullptr);  in UpdateCurrent()
824     assert(current_->Valid());  in UpdateCurrent()
826         mutable_iter_->key(), current_->key());  in UpdateCurrent()
831       current_ = mutable_iter_;  in UpdateCurrent()
834   valid_ = current_ != nullptr && immutable_status_.ok();  in UpdateCurrent()
844   current_over_upper_bound_ = valid_ && IsOverUpperBound(current_->key());  in UpdateCurrent()
855   if (!valid_ || !current_ || !is_prev_set_ || !immutable_status_.ok()) {  in NeedToSeekImmutable()
868   if (immutable_min_heap_.empty() && current_ == mutable_iter_) {  in NeedToSeekImmutable()
873         target, current_ == mutable_iter_ ? immutable_min_heap_.top()->key()  in NeedToSeekImmutable()
874                                           : current_->key()) > 0) {  in NeedToSeekImmutable()
887     if (l0_iters_[i] == current_) {  in DeleteCurrentIter()
899     if (level_iters_[level - 1] == current_) {  in DeleteCurrentIter()