派生类对象构造与析构的顺序

假设A是基类, B是派生类, 顺序如下

构造B对像,从产生到消失的流程

A() -> B() -> ~B() -> ~A()..即符合Last-In-First-Out (LIFO)

#include <map>    
#include <string>    
#include <iostream>    
class A
{
public:
    A(){std::cout<<"constructor A"<<std::endl;};
    ~A(){std::cout<<"desstructor A"<<std::endl;};
    void test(){std::cout<<"invoke test"<<std::endl;};
};
class B:public A
{
public:
    B(){std::cout<<"constructor B"<<std::endl;};
    ~B(){std::cout<<"desstructor B"<<std::endl;};

};


int main(int argc,char* argv[]){    
      B myb;
      myb.test();

        return 0;    
}

 

运行结果:

constructor A
constructor B
invoke test
desstructor B
desstructor A