What is the practical use of pointers to member functions?

Question

I\'ve read through this article, and what I take from it is that when you want to call a pointer to a member function, you need an instance (either a pointer to one or a sta

Answer 1

There are many practical uses. One that comes to my mind is as follows:

Assume a core function such as below (suitably defined myfoo and MFN)

void dosomething(myfoo &m, MFN f){   // m could also be passed by reference to 
                                     // const
   m.*f();
}

Such a function in the presence of pointer to member functions, becomes open for extension and closed for modification (OCP)

Also refer to Safe bool idiom which smartly uses pointer to members.