有没有办法声明一个成员，使它在所有派生类中都是静态的？

class Base {
public:
    static int sharedMember;
};

int Base::sharedMember = 0;

class Derived1 : public Base {
    // Derived1继承了Base类的静态成员sharedMember
};

class Derived2 : public Base {
    // Derived2也继承了Base类的静态成员sharedMember
};

int main() {
    Derived1 d1;
    Derived2 d2;

    // 可以通过任意一个派生类或基类访问静态成员
    d1.sharedMember = 10;
    d2.sharedMember = 20;
    Base::sharedMember = 30;

    // 输出结果为30，因为静态成员在所有派生类中共享
    cout << d1.sharedMember << endl;
    cout << d2.sharedMember << endl;
    cout << Base::sharedMember << endl;

    return 0;
}