继承与包含中构造与析构的执行顺序

[HP笔试题目]

一个类A继承类B并且包含C，B中包含D。在构造A的时候，先构造B中的D，再构造B，然后构造A中的C,最后构造A。虚构的过程刚好相反。例子如下：|

#include<iostream.h>

class IDCart{

public:

IDCart()

{

cout<<"IDCart construstor"<<endl;

}

~IDCart()

{

cout<<"IDCart destrustor"<<endl;

}

};

class person{

public:

person()

{

cout<<"person contrustor"<<endl;

}

~person()

{

cout<<"person destrustor"<<endl;

}

private:

IDCart id;

};

class subject{

public:

subject()

{

cout<<"subject construstor"<<endl;

}

~subject()

{

cout<<"subject destrustor"<<endl;

}

};

class teacher:public person{

public:

teacher()

{

cout<<"teacher construstor"<<endl;

}

~teacher()

{

cout<<"teacher destrustor"<<endl;

}

private:

subject sub;

};

void main()

{

teacher tea;

}

运行的结果如下：

IDCart construstor

person contrustor

subject construstor

teacher construstor

teacher destrustor

subject destrustor

person destrustor

IDCart destrustor