Create a success status.
Create a status with the specified error code and msg as a human-readable string containing more detailed information.
Copy the specified status.
Returns true iff the status indicates success.
!ok(), preserves the current status, but may augment with additional information about
Convenient way of keeping track of the first error encountered. Instead of:
if (overall_status.ok()) overall_status = new_status Use:
Return a string representation of this status suitable for printing. Returns the string
"OK" for success.