This fails when you want `4 + c` or `c + 4.f` etc. So you either have a gross number of overloads doing the same thing, or you just put an implicit constructor

This fails when you want `4 + c` or `c + 4.f` etc. So you either have a gross number of overloads doing the same thing, or you just put an implicit constructor to `complex`. Also, I agree that implicit conversions in general should be avoided, but this complex number example feels like the perfect use case.