.* //对象的成员指针
->* //指针的成员指针
两者都是定义在class之外，提供一种间接访问类中成员的方式，下面将直接使用代码说明
class Mem {
public:mutable int a;Mem(int i) :a(i) {}void fun() {cout << "fun called" << endl;}
};int main()
{int Mem::*pi = &Mem::a;void (Mem::*pf)() = &Mem::fun; //相当于函数指针Mem m(9);cout << m.*pi << endl;(m.*pf)();Mem d(10);Mem* pd = &d;cout << pd->*pi << endl;(pd->*pf)();return 0;
}