Exercise solution:
No single most general class in C++

This exercise is supposed to give rise to some discussion - there is no solution as such. However:

In C# there are some methods in class Object, such as Equals, GetType and ToString. What about these methods in C++
What about data members in a potential Object class in C++
In C# there are no methods outside classes. In C++ ...
Class templates are also part of story ...