#include <iostream>

struct MyBase
{
     virtual void DoStuff(int, float) { std::cout << "Base" << std::endl; } 
};

struct MyDerived : MyBase
{
     virtual void DoStuff(int, float) { std::cout << "Derived" << std::endl; } 
};

int main()
{
    typedef void (MyBase::*memfun)(int, float);

    memfun event(&MyBase::DoStuff);

    MyBase base;
    MyDerived derived;

    (base.*event)(42, 3.14);
    (derived.*event)(42, 3.14);
}