Question

From this reference:

(8.3.3/3) A pointer to member shall not point to a static member of a
class (9.4), a member with reference type, or “cv void.”

Why a pointer cannot point to a static member of a class?

struct S {
     static int f() { /*...*/ };

};

int main()
{
     int (S::*s)() = &S::f; // why?
}

Answer 1

Why a pointer cannot point to a static member of a class?

Because for the purpose of membership it isn’t a member, merely for the purpose of scope. Apart from scope, static members are just like free functions, unattached to an instance of a class. You can use non-member function pointers:

int (*s)() = &S::f;