构造函数调用顺序是从最基类开始到派生类结束，析构函数则是相反的。

#include <iostream>
using namespace std;
class Base1{
public:
	Base1(){
		cout<<"Base1"<<endl;
	}
	~Base1(){
		cout<<"~Base1"<<endl;
	}
};
class Base2: public Base1{
public:
	Base2(){
		cout<<"Base2"<<endl;
	}
	~Base2(){
		cout<<"~Base2"<<endl;
	}
};
class Derived: public Base2{
public:
	Derived(){
		cout<<"Derived"<<endl;
	}
	~Derived(){
		cout<<"~Derived"<<endl;
	}
};
int main() {
    Base1 b1;
    Base2 b2;
    Derived d1;
    return 0;
}

 输出如下：构造函数确实是从最基类（最鸡肋哈哈）开始一直调用它的构造函数到该派生类的构造函数为止。