不，您不能将 virtual 用于字段，只能用于方法.

No, you cannot use virtual for fields, only for methods.

但是，您可以通过创建一个返回对字段的引用的函数来模拟:

However you can simulate that by creating a function that returns a reference to a field:

class Base
{
private:
    int x;

public:
    virtual int& X() { return x; }
};

class Derived : public Base
{
private:
    int x;

public:
    virtual int& X() override { return x; }
};

int main()
{
    Derived d;
    Base* b = &d;

    b->X() = 100; // will set d's x
}