using | ranges::adaptor_sentinel_t = meta::if_c< same_as< detail::adapted_iterator_t< D >, detail::adapted_sentinel_t< D > > &&same_as< detail::begin_adaptor_t< D >, detail::end_adaptor_t< D > >, adaptor_cursor_t< D >, adaptor_sentinel< detail::adapted_sentinel_t< D >, detail::end_adaptor_t< D > >> |