1 2 struct point 3 { pointpoint4 point() {} pointpoint5 point(int x, int y) 6 : x_(x) 7 , y_(y) 8 { 9 } 10 int x_, y_; 11 }; 12 union u 13 { 14 point p_; 15 int i_; 16 const char* s_; 17 }; 18