[c++]容器类。继承类的构造和析构

#include<iostream>
using namespace std;
class Base
{
int x;
public:
Base(int a)
{
x = a;
cout<<"father constructing "<<x<<endl;
}
~Base()
{
cout<<"father destructing "<<x<<endl;
}
};
class Dervied:public Base
{
int y;
Base B2,B1;//只与定义顺序有关
public:
Dervied(int a = 0,int b = 0,int c = 0,int d = 0):B1(d),Base(b),B2(c),y(a)//与参数列表的顺序无关
{
cout<<"son constructing "<<y<<endl;
}
~Dervied()
{
cout<<"son destructing "<<y<<endl;
}
};
int main()
{
Dervied(1,2,3,4);
return 0;
}