Yeah, at the least you'll need an understanding of ULPs[0] before you can write code that's safe in this way. And understanding ULPs means understanding that no

Yeah, at the least you'll need an understanding of ULPs[0] before you can write code that's safe in this way. And understanding ULPs means understanding that no single constant is going to be applicable across the FLT or DBL range. [0] https://en.wikipedia.org/wiki/Unit_in_the_last_place https://en.wikipedia.org/wiki/Unit_in_the_last_place