class B1 {
public:
    int b1;
};

class B2 {
public:
    int b2;
};

class C:
    virtual public B1,
    public B2 {
public:
    int c;
};

C obj;

MAIN
{
    int (B1::*pb1) = &B1::b1;
    int (B2::*pb2) = &B2::b2;

    obj.b1 = 17;
    obj.b2 = 18;

    int (C::*ip) = pb1;     // implicit conversion
}