While it is not apparent how to reinforce a immediate member entry like foo.num = num, You can certainly increase your conventional setter with a further force parameter: Beneath is yet another illustration on how @property might help when just one has to refactor code that is taken from below https://conscientgurugram.in/conscient-parq-sector-80-gurgaon-a-sophisticated-lifestyle-in-the-grandeur-of-the-city/