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1 //===----------------------------------------------------------------------===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8
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9 #ifndef _LIBCPP___ALGORITHM_RANGES_NTH_ELEMENT_H
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10 #define _LIBCPP___ALGORITHM_RANGES_NTH_ELEMENT_H
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11
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12 #include <__algorithm/iterator_operations.h>
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13 #include <__algorithm/make_projected.h>
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14 #include <__algorithm/nth_element.h>
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15 #include <__config>
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16 #include <__functional/identity.h>
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17 #include <__functional/invoke.h>
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18 #include <__functional/ranges_operations.h>
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19 #include <__iterator/concepts.h>
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20 #include <__iterator/iterator_traits.h>
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21 #include <__iterator/next.h>
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22 #include <__iterator/projected.h>
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23 #include <__iterator/sortable.h>
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24 #include <__ranges/access.h>
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25 #include <__ranges/concepts.h>
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26 #include <__ranges/dangling.h>
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27 #include <__utility/forward.h>
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28 #include <__utility/move.h>
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29
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30 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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31 # pragma GCC system_header
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32 #endif
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33
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252
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34 #if _LIBCPP_STD_VER >= 20
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236
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35
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36 _LIBCPP_BEGIN_NAMESPACE_STD
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37
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38 namespace ranges {
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39 namespace __nth_element {
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40
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41 struct __fn {
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42 template <class _Iter, class _Sent, class _Comp, class _Proj>
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252
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43 _LIBCPP_HIDE_FROM_ABI constexpr static _Iter
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44 __nth_element_fn_impl(_Iter __first, _Iter __nth, _Sent __last, _Comp& __comp, _Proj& __proj) {
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236
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45 auto __last_iter = ranges::next(__first, __last);
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46
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47 auto&& __projected_comp = std::__make_projected(__comp, __proj);
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48 std::__nth_element_impl<_RangeAlgPolicy>(std::move(__first), std::move(__nth), __last_iter, __projected_comp);
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49
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50 return __last_iter;
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51 }
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52
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53 template <random_access_iterator _Iter, sentinel_for<_Iter> _Sent, class _Comp = ranges::less, class _Proj = identity>
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54 requires sortable<_Iter, _Comp, _Proj>
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252
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55 _LIBCPP_HIDE_FROM_ABI constexpr _Iter
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56 operator()(_Iter __first, _Iter __nth, _Sent __last, _Comp __comp = {}, _Proj __proj = {}) const {
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236
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57 return __nth_element_fn_impl(std::move(__first), std::move(__nth), std::move(__last), __comp, __proj);
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58 }
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59
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60 template <random_access_range _Range, class _Comp = ranges::less, class _Proj = identity>
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61 requires sortable<iterator_t<_Range>, _Comp, _Proj>
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252
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62 _LIBCPP_HIDE_FROM_ABI constexpr borrowed_iterator_t<_Range>
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63 operator()(_Range&& __r, iterator_t<_Range> __nth, _Comp __comp = {}, _Proj __proj = {}) const {
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236
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64 return __nth_element_fn_impl(ranges::begin(__r), std::move(__nth), ranges::end(__r), __comp, __proj);
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65 }
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66 };
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67
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68 } // namespace __nth_element
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69
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70 inline namespace __cpo {
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252
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71 inline constexpr auto nth_element = __nth_element::__fn{};
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236
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72 } // namespace __cpo
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73 } // namespace ranges
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74
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75 _LIBCPP_END_NAMESPACE_STD
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76
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252
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77 #endif // _LIBCPP_STD_VER >= 20
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236
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78
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79 #endif // _LIBCPP___ALGORITHM_RANGES_NTH_ELEMENT_H
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