C++ - How to access private members of a class, from a static function of the same class?

Question

What I have:

So I have a class with a private member, and a static function. The function must really be static and I can\'t change that.

Answer 1

A static member function cannot access a non-static member (unless it creates its own local instance the non-static member would belong to).

This is because non-static members belong to an instance of the class, and the static member does not. Think about it: If you wrote

Base::callback(...);

what m_member should this access? There simply is no instance of Base and thus not m_member.