struct Ecore_Object {
   Ecore_Iter *(*iter)(void);
}

sturct Ecore_List {
   Ecore_Object obj;
   ...
}

struct Ecore_Iter {
   void *(*next)(void *list);
   void *(*prev)(void *list);
   void *(*first)(void *list);
}

Ecore_Iter *ecore_iterator_new(void *list)
{
   return (ECORE_OBJECT(list)->iter());
}


iter = ecore_iterator_new(my_dlist);
while (iter->next)
{
}


iter = ecore_iterator_new(my_tree)
while (iter->next)
{
}