While It's not obvious how to reinforce a direct member obtain like foo.num = num, You can certainly augment your regular setter with an additional pressure parameter: There is not any other option. Properties are not able to keep any details Although, it might glance they can accomplish that. See https://whitelandgurugram.co.in/whiteland-westin-residences-gurgaon-redefining-ultra-luxury-living-in-sector-103/