继承执行顺序辨析

 

struct B 
{
    B(){ cout<<"B"<<endl;}
    ~B(){cout<<"~B"<<endl;}
};
struct C 
{
    C(){ cout<<"C"<<endl;}
    ~C(){ cout<<"~C"<<endl;}
};
struct D:B 
{
    D(){cout<<"D"<<endl;}
    ~D(){cout<<"~D"<<endl;}
private:
    C c;
};

D *d = new D;
 delete d;

运行结果：  可以看到，类D，构造函数，显示初始化化基类的构造函数，然后再分配成员变量C的内存，最后再执行自身构造函数~~