类成员函数指针

#include <iostream>
using std::cout;
using std::endl;
class A
{
public:
    int fun(int i)
    {
        cout << i << endl;
        return i;
    }
};
int _tmain(int argc, _TCHAR* argv[])
{
    int (A::*p)(int) = &(A::fun);

    A a;
    A* pA = &a;

    int i = (pA->*p)(2);
    i = (a.*p)(3);

 return 0;
}