Class D

base_code/virtual_public.cpp:33–41

};

class D: public B, public C
{
public:
    // B C 虚继承 A 之后，ma 必须交给 D 初始化，所以这里必须调用 A(data)
    D(int data) : A(data), B(data), C(data) { cout << "D()" << endl; }
    ~D() { cout << "~D()" << endl; }
protected:
    int md;
};

int main()
{