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1// -*- C++ -*-
2//===----------------------------------------------------------------------===//
3//
4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5// See https://llvm.org/LICENSE.txt for license information.
6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7//
8//===----------------------------------------------------------------------===//
9
10#ifndef _LIBCPP___FUNCTIONAL_RANGES_OPERATIONS_H
11#define _LIBCPP___FUNCTIONAL_RANGES_OPERATIONS_H
12
13#include <__concepts/equality_comparable.h>
14#include <__concepts/totally_ordered.h>
15#include <__config>
16#include <__type_traits/desugars_to.h>
17#include <__utility/forward.h>
18
19#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
20# pragma GCC system_header
21#endif
22
23_LIBCPP_BEGIN_NAMESPACE_STD
24
25#if _LIBCPP_STD_VER >= 20
26
27namespace ranges {
28
29struct equal_to {
30 template <class _Tp, class _Up>
31 requires equality_comparable_with<_Tp, _Up>
32 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool operator()(_Tp&& __t, _Up&& __u) const
33 noexcept(noexcept(bool(std::forward<_Tp>(__t) == std::forward<_Up>(__u)))) {
34 return std::forward<_Tp>(__t) == std::forward<_Up>(__u);
35 }
36
37 using is_transparent = void;
38};
39
40struct not_equal_to {
41 template <class _Tp, class _Up>
42 requires equality_comparable_with<_Tp, _Up>
43 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool operator()(_Tp&& __t, _Up&& __u) const
44 noexcept(noexcept(bool(!(std::forward<_Tp>(__t) == std::forward<_Up>(__u))))) {
45 return !(std::forward<_Tp>(__t) == std::forward<_Up>(__u));
46 }
47
48 using is_transparent = void;
49};
50
51struct less {
52 template <class _Tp, class _Up>
53 requires totally_ordered_with<_Tp, _Up>
54 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool operator()(_Tp&& __t, _Up&& __u) const
55 noexcept(noexcept(bool(std::forward<_Tp>(__t) < std::forward<_Up>(__u)))) {
56 return std::forward<_Tp>(__t) < std::forward<_Up>(__u);
57 }
58
59 using is_transparent = void;
60};
61
62struct less_equal {
63 template <class _Tp, class _Up>
64 requires totally_ordered_with<_Tp, _Up>
65 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool operator()(_Tp&& __t, _Up&& __u) const
66 noexcept(noexcept(bool(!(std::forward<_Up>(__u) < std::forward<_Tp>(__t))))) {
67 return !(std::forward<_Up>(__u) < std::forward<_Tp>(__t));
68 }
69
70 using is_transparent = void;
71};
72
73struct greater {
74 template <class _Tp, class _Up>
75 requires totally_ordered_with<_Tp, _Up>
76 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool operator()(_Tp&& __t, _Up&& __u) const
77 noexcept(noexcept(bool(std::forward<_Up>(__u) < std::forward<_Tp>(__t)))) {
78 return std::forward<_Up>(__u) < std::forward<_Tp>(__t);
79 }
80
81 using is_transparent = void;
82};
83
84struct greater_equal {
85 template <class _Tp, class _Up>
86 requires totally_ordered_with<_Tp, _Up>
87 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool operator()(_Tp&& __t, _Up&& __u) const
88 noexcept(noexcept(bool(!(std::forward<_Tp>(__t) < std::forward<_Up>(__u))))) {
89 return !(std::forward<_Tp>(__t) < std::forward<_Up>(__u));
90 }
91
92 using is_transparent = void;
93};
94
95} // namespace ranges
96
97// For ranges we do not require that the types on each side of the equality
98// operator are of the same type
99template <class _Tp, class _Up>
100inline const bool __desugars_to_v<__equal_tag, ranges::equal_to, _Tp, _Up> = true;
101
102template <class _Tp, class _Up>
103inline const bool __desugars_to_v<__totally_ordered_less_tag, ranges::less, _Tp, _Up> = true;
104
105template <class _Tp, class _Up>
106inline const bool __desugars_to_v<__less_tag, ranges::less, _Tp, _Up> = true;
107
108template <class _Tp, class _Up>
109inline const bool __desugars_to_v<__greater_tag, ranges::greater, _Tp, _Up> = true;
110
111#endif // _LIBCPP_STD_VER >= 20
112
113_LIBCPP_END_NAMESPACE_STD
114
115#endif // _LIBCPP___FUNCTIONAL_RANGES_OPERATIONS_H