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0001 //===----------------------------------------------------------------------===//
0002 //
0003 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
0004 // See https://llvm.org/LICENSE.txt for license information.
0005 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
0006 //
0007 //===----------------------------------------------------------------------===//
0008 
0009 #ifndef _LIBCPP___ALGORITHM_RANGES_MINMAX_ELEMENT_H
0010 #define _LIBCPP___ALGORITHM_RANGES_MINMAX_ELEMENT_H
0011 
0012 #include <__algorithm/min_max_result.h>
0013 #include <__algorithm/minmax_element.h>
0014 #include <__config>
0015 #include <__functional/identity.h>
0016 #include <__functional/invoke.h>
0017 #include <__functional/ranges_operations.h>
0018 #include <__iterator/concepts.h>
0019 #include <__iterator/projected.h>
0020 #include <__ranges/access.h>
0021 #include <__ranges/concepts.h>
0022 #include <__ranges/dangling.h>
0023 #include <__utility/forward.h>
0024 #include <__utility/move.h>
0025 #include <__utility/pair.h>
0026 
0027 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
0028 #  pragma GCC system_header
0029 #endif
0030 
0031 _LIBCPP_PUSH_MACROS
0032 #include <__undef_macros>
0033 
0034 #if _LIBCPP_STD_VER >= 20
0035 
0036 _LIBCPP_BEGIN_NAMESPACE_STD
0037 
0038 namespace ranges {
0039 
0040 template <class _T1>
0041 using minmax_element_result = min_max_result<_T1>;
0042 
0043 struct __minmax_element {
0044   template <forward_iterator _Ip,
0045             sentinel_for<_Ip> _Sp,
0046             class _Proj                                             = identity,
0047             indirect_strict_weak_order<projected<_Ip, _Proj>> _Comp = ranges::less>
0048   [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr ranges::minmax_element_result<_Ip>
0049   operator()(_Ip __first, _Sp __last, _Comp __comp = {}, _Proj __proj = {}) const {
0050     auto __ret = std::__minmax_element_impl(std::move(__first), std::move(__last), __comp, __proj);
0051     return {__ret.first, __ret.second};
0052   }
0053 
0054   template <forward_range _Rp,
0055             class _Proj                                                         = identity,
0056             indirect_strict_weak_order<projected<iterator_t<_Rp>, _Proj>> _Comp = ranges::less>
0057   [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr ranges::minmax_element_result<borrowed_iterator_t<_Rp>>
0058   operator()(_Rp&& __r, _Comp __comp = {}, _Proj __proj = {}) const {
0059     auto __ret = std::__minmax_element_impl(ranges::begin(__r), ranges::end(__r), __comp, __proj);
0060     return {__ret.first, __ret.second};
0061   }
0062 };
0063 
0064 inline namespace __cpo {
0065 inline constexpr auto minmax_element = __minmax_element{};
0066 } // namespace __cpo
0067 
0068 } // namespace ranges
0069 
0070 _LIBCPP_END_NAMESPACE_STD
0071 
0072 #endif // _LIBCPP_STD_VER >= 20
0073 
0074 _LIBCPP_POP_MACROS
0075 
0076 #endif // _LIBCPP___ALGORITHM_RANGES_MINMAX_H