It truly is tricky for me to guess your intention. On 1 hand you happen to be indicating that each a and b are public (no leading underscore inside their names) so I should theoretically be permitted to obtain/mutate (get/set) the two. But Then you definitely specify an explicit mutator https://smartworldeveloper.in/smart-world-69-gurgaon-redefining-urban-luxury-living-in-sector-69/