1 #include "vbase11.h" 2 3 extern void vbase11_y (derived&); 4 foo()5 int base::foo() { return 1; } foo()6 int derived::foo() { return 2; } bar()7 int derived::bar() { return 3; } 8 vbase11_x()9 void vbase11_x () 10 { 11 derived d; 12 13 vbase11_y (d); 14 } 15