Can ptrdiff_t represent all subtractions of pointers to elements of the same array object?
Is it even possible for the result of i-j not to be in the range of representable values of ptrdiff_t? Yes, but it’s unlikely. In fact, [support.types.layout]/2 does not say much except the proper rules about pointers subtraction and ptrdiff_t are defined in [expr.add]. So let us see this section. [expr.add]/5 When two pointers to … Read more