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_MAX_ELEMENT_H 10 #define _LIBCPP___ALGORITHM_RANGES_MAX_ELEMENT_H 11 12 #include <__algorithm/ranges_min_element.h> 13 #include <__config> 14 #include <__functional/identity.h> 15 #include <__functional/invoke.h> 16 #include <__functional/ranges_operations.h> 17 #include <__iterator/concepts.h> 18 #include <__iterator/projected.h> 19 #include <__ranges/access.h> 20 #include <__ranges/concepts.h> 21 #include <__ranges/dangling.h> 22 23 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 24 # pragma GCC system_header 25 #endif 26 27 _LIBCPP_PUSH_MACROS 28 #include <__undef_macros> 29 30 #if _LIBCPP_STD_VER >= 20 31 32 _LIBCPP_BEGIN_NAMESPACE_STD 33 34 namespace ranges { 35 struct __max_element { 36 template <forward_iterator _Ip, 37 sentinel_for<_Ip> _Sp, 38 class _Proj = identity, 39 indirect_strict_weak_order<projected<_Ip, _Proj>> _Comp = ranges::less> 40 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr _Ip 41 operator()(_Ip __first, _Sp __last, _Comp __comp = {}, _Proj __proj = {}) const { 42 auto __comp_lhs_rhs_swapped = [&](auto&& __lhs, auto&& __rhs) -> bool { return std::invoke(__comp, __rhs, __lhs); }; 43 return ranges::__min_element_impl(__first, __last, __comp_lhs_rhs_swapped, __proj); 44 } 45 46 template <forward_range _Rp, 47 class _Proj = identity, 48 indirect_strict_weak_order<projected<iterator_t<_Rp>, _Proj>> _Comp = ranges::less> 49 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr borrowed_iterator_t<_Rp> 50 operator()(_Rp&& __r, _Comp __comp = {}, _Proj __proj = {}) const { 51 auto __comp_lhs_rhs_swapped = [&](auto&& __lhs, auto&& __rhs) -> bool { return std::invoke(__comp, __rhs, __lhs); }; 52 return ranges::__min_element_impl(ranges::begin(__r), ranges::end(__r), __comp_lhs_rhs_swapped, __proj); 53 } 54 }; 55 56 inline namespace __cpo { 57 inline constexpr auto max_element = __max_element{}; 58 } // namespace __cpo 59 } // namespace ranges 60 61 _LIBCPP_END_NAMESPACE_STD 62 63 #endif // _LIBCPP_STD_VER >= 20 64 65 _LIBCPP_POP_MACROS 66 67 #endif // _LIBCPP___ALGORITHM_RANGES_MAX_ELEMENT_H 68