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 namespace __max_element { 36 struct __fn { 37 template <forward_iterator _Ip, 38 sentinel_for<_Ip> _Sp, 39 class _Proj = identity, 40 indirect_strict_weak_order<projected<_Ip, _Proj>> _Comp = ranges::less> 41 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr _Ip operator__fn42 operator()(_Ip __first, _Sp __last, _Comp __comp = {}, _Proj __proj = {}) const { 43 auto __comp_lhs_rhs_swapped = [&](auto&& __lhs, auto&& __rhs) -> bool { return std::invoke(__comp, __rhs, __lhs); }; 44 return ranges::__min_element_impl(__first, __last, __comp_lhs_rhs_swapped, __proj); 45 } 46 47 template <forward_range _Rp, 48 class _Proj = identity, 49 indirect_strict_weak_order<projected<iterator_t<_Rp>, _Proj>> _Comp = ranges::less> 50 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr borrowed_iterator_t<_Rp> operator__fn51 operator()(_Rp&& __r, _Comp __comp = {}, _Proj __proj = {}) const { 52 auto __comp_lhs_rhs_swapped = [&](auto&& __lhs, auto&& __rhs) -> bool { return std::invoke(__comp, __rhs, __lhs); }; 53 return ranges::__min_element_impl(ranges::begin(__r), ranges::end(__r), __comp_lhs_rhs_swapped, __proj); 54 } 55 }; 56 } // namespace __max_element 57 58 inline namespace __cpo { 59 inline constexpr auto max_element = __max_element::__fn{}; 60 } // namespace __cpo 61 } // namespace ranges 62 63 _LIBCPP_END_NAMESPACE_STD 64 65 #endif // _LIBCPP_STD_VER >= 20 66 67 _LIBCPP_POP_MACROS 68 69 #endif // _LIBCPP___ALGORITHM_RANGES_MAX_ELEMENT_H 70