efl/src/lib/ecore/efl_loop_user.eo

class Efl.Loop_User (Eo.Base)
{
   [[An Efl.Loop_User is a class that require one of the parent to provide
     an Efl.Loop interface when doing provider_find. It will enforce this by
     only allowing parent that provide such interface or NULL.]]
   methods {
      loop_get {
         return: Efl.Loop;
      }
   }
   implements {
      Eo.Base.parent.set;
   }
}