1extern void sf ( __const char *); 2struct Matrix{ 3 int operator[](int n){ 4 sf ( __PRETTY_FUNCTION__); 5 } 6 int operator[](int n)const{ 7 sf ( __PRETTY_FUNCTION__); 8 } 9}; 10void calcmy(Matrix const &b, Matrix &c, int k){ 11 b[k]; 12 c[k]; 13} 14