Iterator

Error Handling

Iterator::status() returns the error of the iterating. The errors include I/O errors, checksum mismatch, unsupported operations, internal errors, or other errors.

If there is no error, the status is Status::OK(). If the status is not OK, the iterator will be invalidated too. In another word, if Iterator::Valid() is true, status() is guaranteed to be OK() so it's safe to proceed other operations without checking status().

On the other hand, if Iterator::Valid() is false, there are two possibilities: (1) We reached the end of the data. In this case, status() is OK(); (2) there is an error. In this case status() is not OK(). It is always a good practice to check status() if the iterator is invalidated.

Coming soon...