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 #include <type_traits>
27 
28 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
29 #  pragma GCC system_header
30 #endif
31 
32 #if _LIBCPP_STD_VER > 17
33 
34 _LIBCPP_BEGIN_NAMESPACE_STD
35 
36 namespace ranges {
37 
38 template <class _T1>
39 using minmax_element_result = min_max_result<_T1>;
40 
41 namespace __minmax_element {
42 struct __fn {
43   template <forward_iterator _Ip, sentinel_for<_Ip> _Sp, class _Proj = identity,
44             indirect_strict_weak_order<projected<_Ip, _Proj>> _Comp = ranges::less>
45   _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr
46   ranges::minmax_element_result<_Ip> operator()(_Ip __first, _Sp __last, _Comp __comp = {}, _Proj __proj = {}) const {
47     auto __ret = std::__minmax_element_impl(std::move(__first), std::move(__last), __comp, __proj);
48     return {__ret.first, __ret.second};
49   }
50 
51   template <forward_range _Rp, class _Proj = identity,
52             indirect_strict_weak_order<projected<iterator_t<_Rp>, _Proj>> _Comp = ranges::less>
53   _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr
54   ranges::minmax_element_result<borrowed_iterator_t<_Rp>>
55   operator()(_Rp&& __r, _Comp __comp = {}, _Proj __proj = {}) const {
56     auto __ret = std::__minmax_element_impl(ranges::begin(__r), ranges::end(__r), __comp, __proj);
57     return {__ret.first, __ret.second};
58   }
59 };
60 } // namespace __minmax_element
61 
62 inline namespace __cpo {
63   inline constexpr auto minmax_element = __minmax_element::__fn{};
64 } // namespace __cpo
65 
66 } // namespace ranges
67 
68 _LIBCPP_END_NAMESPACE_STD
69 
70 #endif // _LIBCPP_STD_VER > 17
71 
72 #endif // _LIBCPP___ALGORITHM_RANGES_MINMAX_H
73