xref: /freebsd-src/contrib/llvm-project/libcxx/include/__algorithm/ranges_max_element.h (revision 0fca6ea1d4eea4c934cfff25ac9ee8ad6fe95583)
181ad6265SDimitry Andric //===----------------------------------------------------------------------===//
281ad6265SDimitry Andric //
381ad6265SDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
481ad6265SDimitry Andric // See https://llvm.org/LICENSE.txt for license information.
581ad6265SDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
681ad6265SDimitry Andric //
781ad6265SDimitry Andric //===----------------------------------------------------------------------===//
881ad6265SDimitry Andric 
981ad6265SDimitry Andric #ifndef _LIBCPP___ALGORITHM_RANGES_MAX_ELEMENT_H
1081ad6265SDimitry Andric #define _LIBCPP___ALGORITHM_RANGES_MAX_ELEMENT_H
1181ad6265SDimitry Andric 
1281ad6265SDimitry Andric #include <__algorithm/ranges_min_element.h>
1381ad6265SDimitry Andric #include <__config>
1481ad6265SDimitry Andric #include <__functional/identity.h>
1581ad6265SDimitry Andric #include <__functional/invoke.h>
1681ad6265SDimitry Andric #include <__functional/ranges_operations.h>
1781ad6265SDimitry Andric #include <__iterator/concepts.h>
1881ad6265SDimitry Andric #include <__iterator/projected.h>
1981ad6265SDimitry Andric #include <__ranges/access.h>
2081ad6265SDimitry Andric #include <__ranges/concepts.h>
2181ad6265SDimitry Andric #include <__ranges/dangling.h>
2281ad6265SDimitry Andric 
2381ad6265SDimitry Andric #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
2481ad6265SDimitry Andric #  pragma GCC system_header
2581ad6265SDimitry Andric #endif
2681ad6265SDimitry Andric 
27b3edf446SDimitry Andric _LIBCPP_PUSH_MACROS
28b3edf446SDimitry Andric #include <__undef_macros>
29b3edf446SDimitry Andric 
3006c3fb27SDimitry Andric #if _LIBCPP_STD_VER >= 20
3181ad6265SDimitry Andric 
3281ad6265SDimitry Andric _LIBCPP_BEGIN_NAMESPACE_STD
3381ad6265SDimitry Andric 
3481ad6265SDimitry Andric namespace ranges {
3581ad6265SDimitry Andric namespace __max_element {
3681ad6265SDimitry Andric struct __fn {
3706c3fb27SDimitry Andric   template <forward_iterator _Ip,
3806c3fb27SDimitry Andric             sentinel_for<_Ip> _Sp,
3906c3fb27SDimitry Andric             class _Proj                                             = identity,
4081ad6265SDimitry Andric             indirect_strict_weak_order<projected<_Ip, _Proj>> _Comp = ranges::less>
41*0fca6ea1SDimitry Andric   [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr _Ip
4206c3fb27SDimitry Andric   operator()(_Ip __first, _Sp __last, _Comp __comp = {}, _Proj __proj = {}) const {
435f757f3fSDimitry Andric     auto __comp_lhs_rhs_swapped = [&](auto&& __lhs, auto&& __rhs) -> bool { return std::invoke(__comp, __rhs, __lhs); };
4481ad6265SDimitry Andric     return ranges::__min_element_impl(__first, __last, __comp_lhs_rhs_swapped, __proj);
4581ad6265SDimitry Andric   }
4681ad6265SDimitry Andric 
4706c3fb27SDimitry Andric   template <forward_range _Rp,
4806c3fb27SDimitry Andric             class _Proj                                                         = identity,
4981ad6265SDimitry Andric             indirect_strict_weak_order<projected<iterator_t<_Rp>, _Proj>> _Comp = ranges::less>
50*0fca6ea1SDimitry Andric   [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr borrowed_iterator_t<_Rp>
5106c3fb27SDimitry Andric   operator()(_Rp&& __r, _Comp __comp = {}, _Proj __proj = {}) const {
525f757f3fSDimitry Andric     auto __comp_lhs_rhs_swapped = [&](auto&& __lhs, auto&& __rhs) -> bool { return std::invoke(__comp, __rhs, __lhs); };
5381ad6265SDimitry Andric     return ranges::__min_element_impl(ranges::begin(__r), ranges::end(__r), __comp_lhs_rhs_swapped, __proj);
5481ad6265SDimitry Andric   }
5581ad6265SDimitry Andric };
5681ad6265SDimitry Andric } // namespace __max_element
5781ad6265SDimitry Andric 
5881ad6265SDimitry Andric inline namespace __cpo {
5981ad6265SDimitry Andric inline constexpr auto max_element = __max_element::__fn{};
6081ad6265SDimitry Andric } // namespace __cpo
6181ad6265SDimitry Andric } // namespace ranges
6281ad6265SDimitry Andric 
6381ad6265SDimitry Andric _LIBCPP_END_NAMESPACE_STD
6481ad6265SDimitry Andric 
6506c3fb27SDimitry Andric #endif // _LIBCPP_STD_VER >= 20
6681ad6265SDimitry Andric 
67b3edf446SDimitry Andric _LIBCPP_POP_MACROS
68b3edf446SDimitry Andric 
6981ad6265SDimitry Andric #endif // _LIBCPP___ALGORITHM_RANGES_MAX_ELEMENT_H
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