C++ Pointer to member of a member?

Suppose I have two classes:

class A
{
    int x;
    int y;
};


class B
{
    int z;
    A ref;
};

Suppose I also have a function that accepts a pointer-to-member integer of B, like so:

void doSomethingToB(B* object, int B::* val)
{
    if(val)
    {
        std::cout << object.*val;
    }
}

Would there be a way that I could point to a member of ref inside B?

Like, int B::* ptr = &(B::ref.x) or something similar?