xref: /freebsd/contrib/llvm-project/libcxx/include/__functional/ranges_operations.h (revision e32fecd0c2c3ee37c47ee100f169e7eb0282a873)
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 <__config>
14 #include <__utility/forward.h>
15 #include <concepts>
16 
17 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
18 #  pragma GCC system_header
19 #endif
20 
21 _LIBCPP_BEGIN_NAMESPACE_STD
22 
23 #if _LIBCPP_STD_VER > 17
24 
25 namespace ranges {
26 
27 struct equal_to {
28   template <class _Tp, class _Up>
29   requires equality_comparable_with<_Tp, _Up>
30   [[nodiscard]] constexpr bool operator()(_Tp &&__t, _Up &&__u) const
31       noexcept(noexcept(bool(_VSTD::forward<_Tp>(__t) == _VSTD::forward<_Up>(__u)))) {
32     return _VSTD::forward<_Tp>(__t) == _VSTD::forward<_Up>(__u);
33   }
34 
35   using is_transparent = void;
36 };
37 
38 struct not_equal_to {
39   template <class _Tp, class _Up>
40   requires equality_comparable_with<_Tp, _Up>
41   [[nodiscard]] constexpr bool operator()(_Tp &&__t, _Up &&__u) const
42       noexcept(noexcept(bool(!(_VSTD::forward<_Tp>(__t) == _VSTD::forward<_Up>(__u))))) {
43     return !(_VSTD::forward<_Tp>(__t) == _VSTD::forward<_Up>(__u));
44   }
45 
46   using is_transparent = void;
47 };
48 
49 struct less {
50   template <class _Tp, class _Up>
51   requires totally_ordered_with<_Tp, _Up>
52   [[nodiscard]] constexpr bool operator()(_Tp &&__t, _Up &&__u) const
53       noexcept(noexcept(bool(_VSTD::forward<_Tp>(__t) < _VSTD::forward<_Up>(__u)))) {
54     return _VSTD::forward<_Tp>(__t) < _VSTD::forward<_Up>(__u);
55   }
56 
57   using is_transparent = void;
58 };
59 
60 struct less_equal {
61   template <class _Tp, class _Up>
62   requires totally_ordered_with<_Tp, _Up>
63   [[nodiscard]] constexpr bool operator()(_Tp &&__t, _Up &&__u) const
64       noexcept(noexcept(bool(!(_VSTD::forward<_Up>(__u) < _VSTD::forward<_Tp>(__t))))) {
65     return !(_VSTD::forward<_Up>(__u) < _VSTD::forward<_Tp>(__t));
66   }
67 
68   using is_transparent = void;
69 };
70 
71 struct greater {
72   template <class _Tp, class _Up>
73   requires totally_ordered_with<_Tp, _Up>
74   [[nodiscard]] constexpr bool operator()(_Tp &&__t, _Up &&__u) const
75       noexcept(noexcept(bool(_VSTD::forward<_Up>(__u) < _VSTD::forward<_Tp>(__t)))) {
76     return _VSTD::forward<_Up>(__u) < _VSTD::forward<_Tp>(__t);
77   }
78 
79   using is_transparent = void;
80 };
81 
82 struct greater_equal {
83   template <class _Tp, class _Up>
84   requires totally_ordered_with<_Tp, _Up>
85   [[nodiscard]] constexpr bool operator()(_Tp &&__t, _Up &&__u) const
86       noexcept(noexcept(bool(!(_VSTD::forward<_Tp>(__t) < _VSTD::forward<_Up>(__u))))) {
87     return !(_VSTD::forward<_Tp>(__t) < _VSTD::forward<_Up>(__u));
88   }
89 
90   using is_transparent = void;
91 };
92 
93 } // namespace ranges
94 
95 #endif // _LIBCPP_STD_VER > 17
96 
97 _LIBCPP_END_NAMESPACE_STD
98 
99 #endif // _LIBCPP___FUNCTIONAL_RANGES_OPERATIONS_H
100