#include<iostream>
using namespace std;
class A{
public:
	A(char *s)
	{
		cout << s << endl;
	}
	~A(){}
};
class B :virtual public A
{
public:
	B(char *s1, char*s2) :A(s1){
		cout << s2 << endl;
	}
};
class C :virtual public A
{
public:
	C(char *s1, char*s2) :A(s1){
		cout << s2 << endl;
	}
};
class D :public B, public C
{
public:
	D(char *s1, char *s2, char *s3, char *s4) :B(s1, s2), C(s1, s3), A(s2 )//初始化成員列表的順序不是真的構造順序
	{                                                                      //其構造順序與基類被繼承的順序相關
		cout << s4 << endl;
	}
};
int main() {
	D *p = new D("class A", "class B", "class C", "class D");
	delete p;
	return 0;
}

//輸出：BBCD