cpp/error/error code/operator cmp

Compares two error code objects.

@1@ Compares and  for equality. @2@ Compares and  for equality. @3@ Checks whether is less than. @4@ Obtains three-way comparison result of and.

Return value
@1@ if the error category and error value compare equal. @2@ if the error category or error value compare are not equal. @3@ if. Otherwise, if. Otherwise,. @4@ if it is not. Otherwise,.