#include <list>
using namespace std;




class arr_refBase {};

template <class T, class arr_container>
class _arr_internal_ref : public arr_refBase {};

template <class T, template<class> class STL_container>
class _arr_internal_container {
	STL_container<_arr_internal_ref<T,_arr_internal_container> *> internal_container;
};


/*
template <class T, class A =  __STL_DEFAULT_ALLOCATOR(T) >
struct cont3: _List_base<T, A> {
  A a;
  cont3(): _List_base<T,A>(a) {}
  
};
*/

int main()
{  
	//_arr_internal_container<arr_refBase, cont3 > observers;  
	_arr_internal_container<arr_refBase, list > observers;  
  return 0;
}