struct A
{
    unsigned int m_uiField;
};
 
struct B : A
{
    virtual void VirtualMethod() { }
};
 
int main()
{
    A instance_a;
    B instance_b;
 
    unsigned int A::*  ptrA = &A::m_uiField;
    unsigned int B::*  ptrB = &B::m_uiField;
 
    // application:
    unsigned int value = instance_a.*ptrA;
                 value = instance_b.*ptrA;
               //value = instance_a.*ptrB; // incompatible types
                 value = instance_b.*ptrB;
 
    // also:
    A* dynamic = new B();
    value = dynamic->*ptrA; // etc
}
 

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