1 void tweak(int); 2 3 struct VirtualToNormal { 4 virtual void print(); 5 } virtual_to_normal; print()6void VirtualToNormal::print() { tweak(0); } 7 8 struct NormalToVirtual { 9 void print(); 10 } normal_to_virtual; print()11void NormalToVirtual::print() { tweak(1); } 12