How to declare data members that are objects of any type in a class

Question

In this piece I\'m trying to declare in Class B a list that can hold objects of Class A of any type, such as A, A, A. I intend to add A

Answer 1

Member variables aren't allowed to be templates. Only member functions can be templates. You'll have to templatize the enclosing class B instead:

template 
class B {
  std::list*> objects;
};