C++ Primer Plus学习笔记之继承类的初始化顺序

C++ Primer Plus学习笔记之继承类的初始化顺序

基类的构造函数，析构函数和操作符函数operator=是不能被派生类继承的；
那么，当创建一个派生类对象时，怎样调用基类的构造函数对基类的数据进行初始化呢？？？
答案是：构造函数执行时遵行先兄长(基类)，再客人(对象成员)，后自己(派生类)的顺序；
另一方面，执行析构函数时，先执行派生类的析构函数，再执行基类的析构函数。原因是，对基类的破坏隐含了对派生类的破坏，所以派生类的析构函数必须先执行；

#include<iostream>

using namespace std;

class Member
{
public:
Member()
{
cout<<"Member created"<<endl;
}
~Member()
{
cout<<"Member destroyed"<<endl;
}
};

class Base
{
public:
Base()
{
cout<<"Base created"<<endl;
}
~Base()
{
cout<<"Base destroyed"<<endl;
}
};

class Derived:public Base
{
public:
Derived()
{
cout<<"Derived created"<<endl;
}
~Derived()
{
cout<<"Derived destroyed"<<endl;
}
private:
Member m;
};

int main(int argc,char *argv[])
{
Derived d;

return 0;
}

运行结果：

Base created
Member created
Derived created
Derived destroyed
Member destroyed
Base destroyed