子类中调用构造函数和析构函数的顺序

 

class A{
public:
	A(){ cout << "this is A" << endl; }
	~A(){ cout << "delete A" << endl; }
};
class B{
public:
	B(){ cout << "this is B" << endl; }
	~B(){ cout << "delete B" << endl; }
};
class C :public B, A {
public:
	~C(){ cout << "delete C" << endl; }
	C(){ cout << "this is class C" << endl; }
};
int main()
{
	C temp;
	return 0;
}

运行结果为：

this is B
this is A
this is class C
delete C
delete A
delete B

 

1、C调用B，A的顺序是 由继承中声明的顺序决定的。

　　public B ，A；  // 决定了先构造B，然后A

2、先调用父类的构造函数，然后再调用子类的构造函数

3、析构时先析构子类，再析构父类