30     next(_InputIter __x, typename iterator_traits<_InputIter>::difference_type __n = 1) {
34   _VSTD::advance(__x, __n);
35   return __x;
48   constexpr _Ip operator()(_Ip __x) const {  in operator()
49     ++__x;  in operator()
50     return __x;  in operator()
55   constexpr _Ip operator()(_Ip __x, iter_difference_t<_Ip> __n) const {  in operator()
56     ranges::advance(__x, __n);  in operator()
57     return __x;  in operator()
61   _LIBCPP_HIDE_FROM_ABI constexpr _Ip operator()(_Ip __x, _Sp __bound_sentinel) const {  in operator()
62     ranges::advance(__x, __bound_sentinel);  in operator()
63     return __x;  in operator()
67 …_LIBCPP_HIDE_FROM_ABI constexpr _Ip operator()(_Ip __x, iter_difference_t<_Ip> __n, _Sp __bound_se…  in operator()
68     ranges::advance(__x, __n, __bound_sentinel);  in operator()
69     return __x;  in operator()