Method operator-

tests/test_operator_overloading.cpp:45–45

    }

    Vector2 operator-() const { return Vector2(-x, -y); }
    Vector2 operator+(const Vector2 &v) const { return Vector2(x + v.x, y + v.y); }
    Vector2 operator-(const Vector2 &v) const { return Vector2(x - v.x, y - v.y); }
    Vector2 operator-(float value) const { return Vector2(x - value, y - value); }