code: def configured_class(cls):
          # type: () -> type
          
          base = cls.configurable_base()
          # Manually mangle the private name to see whether this base
          # has been configured (and not another base higher in the
          # hierarchy).
          if base.__dict__.get('_Configurable__impl_class') is None:
              base.__impl_class = cls.configurable_default()
          return base.__impl_class
docs: Returns the currently configured class.