Warning: This file is not a C or C++ file. It does not have highlighting.
| 1 | //===----------------------------------------------------------------------===// |
|---|---|
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | |
| 9 | #ifndef _LIBCPP___ALGORITHM_RANGES_NTH_ELEMENT_H |
| 10 | #define _LIBCPP___ALGORITHM_RANGES_NTH_ELEMENT_H |
| 11 | |
| 12 | #include <__algorithm/iterator_operations.h> |
| 13 | #include <__algorithm/make_projected.h> |
| 14 | #include <__algorithm/nth_element.h> |
| 15 | #include <__config> |
| 16 | #include <__functional/identity.h> |
| 17 | #include <__functional/invoke.h> |
| 18 | #include <__functional/ranges_operations.h> |
| 19 | #include <__iterator/concepts.h> |
| 20 | #include <__iterator/iterator_traits.h> |
| 21 | #include <__iterator/next.h> |
| 22 | #include <__iterator/projected.h> |
| 23 | #include <__iterator/sortable.h> |
| 24 | #include <__ranges/access.h> |
| 25 | #include <__ranges/concepts.h> |
| 26 | #include <__ranges/dangling.h> |
| 27 | #include <__utility/forward.h> |
| 28 | #include <__utility/move.h> |
| 29 | |
| 30 | #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| 31 | # pragma GCC system_header |
| 32 | #endif |
| 33 | |
| 34 | _LIBCPP_PUSH_MACROS |
| 35 | #include <__undef_macros> |
| 36 | |
| 37 | #if _LIBCPP_STD_VER >= 20 |
| 38 | |
| 39 | _LIBCPP_BEGIN_NAMESPACE_STD |
| 40 | |
| 41 | namespace ranges { |
| 42 | struct __nth_element { |
| 43 | template <class _Iter, class _Sent, class _Comp, class _Proj> |
| 44 | _LIBCPP_HIDE_FROM_ABI constexpr static _Iter |
| 45 | __nth_element_fn_impl(_Iter __first, _Iter __nth, _Sent __last, _Comp& __comp, _Proj& __proj) { |
| 46 | auto __last_iter = ranges::next(__first, __last); |
| 47 | |
| 48 | auto&& __projected_comp = std::__make_projected(__comp, __proj); |
| 49 | std::__nth_element_impl<_RangeAlgPolicy>(std::move(__first), std::move(__nth), __last_iter, __projected_comp); |
| 50 | |
| 51 | return __last_iter; |
| 52 | } |
| 53 | |
| 54 | template <random_access_iterator _Iter, sentinel_for<_Iter> _Sent, class _Comp = ranges::less, class _Proj = identity> |
| 55 | requires sortable<_Iter, _Comp, _Proj> |
| 56 | _LIBCPP_HIDE_FROM_ABI constexpr _Iter |
| 57 | operator()(_Iter __first, _Iter __nth, _Sent __last, _Comp __comp = {}, _Proj __proj = {}) const { |
| 58 | return __nth_element_fn_impl(std::move(__first), std::move(__nth), std::move(__last), __comp, __proj); |
| 59 | } |
| 60 | |
| 61 | template <random_access_range _Range, class _Comp = ranges::less, class _Proj = identity> |
| 62 | requires sortable<iterator_t<_Range>, _Comp, _Proj> |
| 63 | _LIBCPP_HIDE_FROM_ABI constexpr borrowed_iterator_t<_Range> |
| 64 | operator()(_Range&& __r, iterator_t<_Range> __nth, _Comp __comp = {}, _Proj __proj = {}) const { |
| 65 | return __nth_element_fn_impl(ranges::begin(__r), std::move(__nth), ranges::end(__r), __comp, __proj); |
| 66 | } |
| 67 | }; |
| 68 | |
| 69 | inline namespace __cpo { |
| 70 | inline constexpr auto nth_element = __nth_element{}; |
| 71 | } // namespace __cpo |
| 72 | } // namespace ranges |
| 73 | |
| 74 | _LIBCPP_END_NAMESPACE_STD |
| 75 | |
| 76 | #endif // _LIBCPP_STD_VER >= 20 |
| 77 | |
| 78 | _LIBCPP_POP_MACROS |
| 79 | |
| 80 | #endif // _LIBCPP___ALGORITHM_RANGES_NTH_ELEMENT_H |
| 81 |
Warning: This file is not a C or C++ file. It does not have highlighting.