构造函数和析构函数的调用次序

#include <iostream>using namespace std;class B{public:B() {cout<<"Constructing B"<<endl;}~B() {cout<<"Destructing B"<<endl;}};class C{public:C() {cout<<"Constructing C"<<endl;}~C() {cout<<"Destructing C"<<endl;}};class D:public C{public:D() {cout<<"Constructing D"<<endl;}~D() {cout<<"Destructing D"<<endl;}B b;C c;};void main(){D d;}