重载->运算符

https://blog.csdn.net/custa/article/details/5674434

#include <iostream>
using namespace std;

class A {
public:
	void action() {
		cout << "Action in class A!" << endl;
	}
};

class B {
	A a;
public:
	A* operator->() {
		return &a;
	}
	void action() {
		cout << "Action in class B!" << endl;
	}
};

class C {
	B b;
public:
	B operator->() {
		return b;
	}
	/*
	B* operator->() {
		return &b;
	}
	C* operator->() {
		return new C;
	}
	*/
	
	void action() {
		cout << "Action in class C!" << endl;
	}
};

int main(int argc, char *argv[])
{
	C* pc = new C;
	pc->action();   //pc是C指针，调用->默认含义
	C c;
	c->action();  //c为对象，递归调用operator->()成员函数，直到返回值为指针，再调用指针所在类的action()
	getchar();
	return 0;
}