c++中基类与派生类中隐含的this指针的分析

             1 #include<iostream>
 2usingnamespace std;
 3 4class Parent{
 5public:
 6int x;
 7          Parent *p;
 8public:
 9         Parent(){}
10          Parent(int x){
11this->x=x; 
12            p=this;
13        }
14virtualvoid f(){
15             cout<<"Parent::f()"<<endl; 
16        }
17void g(){
18             cout<<"Parent::g()"<<endl;
19        }
2021void h(){
22             cout<<"Parent::h()"<<endl;
23            f();
24            g();
25            y();
26             cout<<"LOOK HERE: "<<x<<endl;
27        }
2829private:
30void y(){
31                 cout<<"Parent::y()"<<endl;
32            }
33};
3435class Child : public Parent{
36public:
37int x;
3839public:
40        Child(){}
41         Child(int x) : Parent(x+5){//正确的调用父类构造函数要写在初始化型参列表中 
4243//这样企图调用父类的构造函数是错误的，因为这是另外创造了一个临时对象，函数结束之后就什么都没有了！ 
44//Parent(x+5);45this->x=x;
46        }
47void f(){
48             cout<<"Child f()"<<endl;
49        }
50void g(){
51             cout<<"Child g()"<<endl; 
52        }
53};
5455int main(){
56//例一 57     Child *ch=new Child();
58     ch->h(); 
59     cout<<endl;
60//例二： 61     ch=new Child(5);
62     ch->h();
63     cout<<endl;
6465//例三： 66     ch->p->h();
67return0;
68 } 

            /*
            
Parent::h()
Child f()
Parent::g()
Parent::y()
LOOK HERE: 9306304

Parent::h()
Child f()
Parent::g()
Parent::y()
LOOK HERE: 10

Parent::h()
Child f()
Parent::g()
Parent::y()
LOOK HERE: 10

            */