C++虚继承

#include <iostream>
using namespace std;

class Base0 {
public:
    int var0;
    void fun0() { cout << "Member of Base0" << endl; }
};

class Base1: virtual public Base0 {
public:
    int var1;
};

class Base2: virtual public Base0 {
public:
    int var2;
};

class Derived: public Base1, public Base2 {
public:
    int var;
    void fun() { cout << "Member of Derived" << endl; }
};

int main() {
    Derived d;
    d.var0 = 2;
    d.fun0();
    return 0;
}