How can you modify an object without calling member functions?

Question

At 3.10/10, the standard says:

An lvalue for an object is necessary in order to modify the object except that an rvalue of class type can also be used to

Answer 1

A member function can change the member directly, but it can also delegate that responsibility:

struct Foo {
  int x;
  void Bar() { scanf("%d", &x); }
};

The current wording of the standard has the advantage that one doesn't need to argue whether this is a case of Bar changing the object. If we'd agree that scanf changes the object, then that's just another example.