31 struct Vector2 {  struct
39     void operator+=(const Vector2& v) {  argument
44     void operator-=(const Vector2& v) {
69     Vector2 operator+(const Vector2& v) const { return (Vector2){x + v.x, y + v.y}; }
71     Vector2 operator-(const Vector2& v) const { return (Vector2){x - v.x, y - v.y}; }
73     Vector2 operator/(float s) const { return (Vector2){x / s, y / s}; }
75     Vector2 operator*(float s) const { return (Vector2){x * s, y * s}; }
83     Vector2 copyNormalized() const {  in copyNormalized()  argument
84         Vector2 v = {x, y};  in copyNormalized()
89     float dot(const Vector2& v) const { return x * v.x + y * v.y; }  in dot()  argument
91     float cross(const Vector2& v) const { return x * v.y - y * v.x; }  in cross()  argument