249   struct BatchCounter : public WriteBatch::Handler {  in UpdateCurrentWriteBatch()  struct
250     SequenceNumber sequence_;  in UpdateCurrentWriteBatch()
251     BatchCounter(SequenceNumber sequence) : sequence_(sequence) {}  in UpdateCurrentWriteBatch()  argument
252     Status MarkNoop(bool empty_batch) override {  in UpdateCurrentWriteBatch()
258     Status MarkEndPrepare(const Slice&) override {  in UpdateCurrentWriteBatch()
262     Status MarkCommit(const Slice&) override {  in UpdateCurrentWriteBatch()
267     Status PutCF(uint32_t /*cf*/, const Slice& /*key*/,  in UpdateCurrentWriteBatch()
271     Status DeleteCF(uint32_t /*cf*/, const Slice& /*key*/) override {  in UpdateCurrentWriteBatch()
274     Status SingleDeleteCF(uint32_t /*cf*/, const Slice& /*key*/) override {  in UpdateCurrentWriteBatch()
277     Status MergeCF(uint32_t /*cf*/, const Slice& /*key*/,  in UpdateCurrentWriteBatch()
281     Status MarkBeginPrepare(bool) override { return Status::OK(); }  in UpdateCurrentWriteBatch()
282     Status MarkRollback(const Slice&) override { return Status::OK(); }  in UpdateCurrentWriteBatch()