模板化类上的C++运算符重载

template<typename T>
class Vector2D {
public:
    Vector2D(T x, T y) : x_(x), y_(y) {}

    Vector2D<T> operator+(const Vector2D<T>& other) const {
        return Vector2D<T>(x_ + other.x_, y_ + other.y_);
    }

    Vector2D<T> operator-(const Vector2D<T>& other) const {
        return Vector2D<T>(x_ - other.x_, y_ - other.y_);
    }

    Vector2D<T> operator*(const T& scalar) const {
        return Vector2D<T>(x_ * scalar, y_ * scalar);
    }

    Vector2D<T> operator/(const T& scalar) const {
        return Vector2D<T>(x_ / scalar, y_ / scalar);
    }

private:
    T x_;
    T y_;
};