//類模板封裝(奇技淫巧)
#include<iostream>
using namespace std;
class A
{
public:
	A(int id):_id(id){}
	~A() {}
	void print() {
		std::cout << "User[" << _id << "] login success..." << std::endl;
	}
private:
	A() {}
	int _id;
};

template<class T>
class B
{
	typedef void
 
 (T::*CallBack)();
public:
	B(T& u,CallBack method):Object(&u),_method(method) {}
	~B() {}

	void p() {
		//或許是因為模板類在編譯時才能確定型別
		//所以函式指標必須要加上*
		(Object->*_method)();//這一步重點
	}

private:
	T* Object;
	CallBack _method;
};


int main() {
	A a(666);
	B<A> b(a,&A::print);
	b.p();

	A a1(
 
888);
	B<A> b1(a1,&A::print);
	b1.p();
	cin.get();
	return 0;
}