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_MINMAX_ELEMENT_H
10 #define _LIBCPP___ALGORITHM_RANGES_MINMAX_ELEMENT_H
11 
12 #include <__algorithm/min_max_result.h>
13 #include <__algorithm/minmax_element.h>
14 #include <__config>
15 #include <__functional/identity.h>
16 #include <__functional/invoke.h>
17 #include <__functional/ranges_operations.h>
18 #include <__iterator/concepts.h>
19 #include <__iterator/projected.h>
20 #include <__ranges/access.h>
21 #include <__ranges/concepts.h>
22 #include <__ranges/dangling.h>
23 #include <__utility/forward.h>
24 #include <__utility/move.h>
25 #include <__utility/pair.h>
26 
27 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
28 #  pragma GCC system_header
29 #endif
30 
31 _LIBCPP_PUSH_MACROS
32 #include <__undef_macros>
33 
34 #if _LIBCPP_STD_VER >= 20
35 
36 _LIBCPP_BEGIN_NAMESPACE_STD
37 
38 namespace ranges {
39 
40 template <class _T1>
41 using minmax_element_result = min_max_result<_T1>;
42 
43 namespace __minmax_element {
44 struct __fn {
45   template <forward_iterator _Ip,
46             sentinel_for<_Ip> _Sp,
47             class _Proj                                             = identity,
48             indirect_strict_weak_order<projected<_Ip, _Proj>> _Comp = ranges::less>
49   [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr ranges::minmax_element_result<_Ip>
operator__fn50   operator()(_Ip __first, _Sp __last, _Comp __comp = {}, _Proj __proj = {}) const {
51     auto __ret = std::__minmax_element_impl(std::move(__first), std::move(__last), __comp, __proj);
52     return {__ret.first, __ret.second};
53   }
54 
55   template <forward_range _Rp,
56             class _Proj                                                         = identity,
57             indirect_strict_weak_order<projected<iterator_t<_Rp>, _Proj>> _Comp = ranges::less>
58   [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr ranges::minmax_element_result<borrowed_iterator_t<_Rp>>
operator__fn59   operator()(_Rp&& __r, _Comp __comp = {}, _Proj __proj = {}) const {
60     auto __ret = std::__minmax_element_impl(ranges::begin(__r), ranges::end(__r), __comp, __proj);
61     return {__ret.first, __ret.second};
62   }
63 };
64 } // namespace __minmax_element
65 
66 inline namespace __cpo {
67 inline constexpr auto minmax_element = __minmax_element::__fn{};
68 } // namespace __cpo
69 
70 } // namespace ranges
71 
72 _LIBCPP_END_NAMESPACE_STD
73 
74 #endif // _LIBCPP_STD_VER >= 20
75 
76 _LIBCPP_POP_MACROS
77 
78 #endif // _LIBCPP___ALGORITHM_RANGES_MINMAX_H
79