1 // std::rel_ops implementation -*- C++ -*-
2
3 // Copyright (C) 2001-2022 Free Software Foundation, Inc.
4 //
5 // This file is part of the GNU ISO C++ Library. This library is free
6 // software; you can redistribute it and/or modify it under the
7 // terms of the GNU General Public License as published by the
8 // Free Software Foundation; either version 3, or (at your option)
9 // any later version.
10
11 // This library is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 // GNU General Public License for more details.
15
16 // Under Section 7 of GPL version 3, you are granted additional
17 // permissions described in the GCC Runtime Library Exception, version
18 // 3.1, as published by the, 2009 Free Software Foundation.
19
20 // You should have received a copy of the GNU General Public License and
21 // a copy of the GCC Runtime Library Exception along with this program;
22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23 // <http://www.gnu.org/licenses/>.
24
25 /*
26 *
27 * Copyright (c) 1994
28 * Hewlett-Packard Company
29 *
30 * Permission to use, copy, modify, distribute and sell this software
31 * and its documentation for any purpose is hereby granted without fee,
32 * provided that the above copyright notice appear in all copies and
33 * that both that copyright notice and this permission notice appear
34 * in supporting documentation. Hewlett-Packard Company makes no
35 * representations about the suitability of this software for any
36 * purpose. It is provided "as is" without express or implied warranty.
37 *
38 * Copyright (c) 1996,1997
39 * Silicon Graphics
40 *
41 * Permission to use, copy, modify, distribute and sell this software
42 * and its documentation for any purpose is hereby granted without fee,
43 * provided that the above copyright notice appear in all copies and
44 * that both that copyright notice and this permission notice appear
45 * in supporting documentation. Silicon Graphics makes no
46 * representations about the suitability of this software for any
47 * purpose. It is provided "as is" without express or implied warranty.
48 *
49 */
50
51 /** @file bits/stl_relops.h
52 * This is an internal header file, included by other library headers.
53 * Do not attempt to use it directly. @headername{utility}
54 *
55 * This file is only included by `<utility>`, which is required by the
56 * standard to define namespace `rel_ops` and its contents.
57 */
58
59 #ifndef _STL_RELOPS_H
60 #define _STL_RELOPS_H 1
61
_GLIBCXX_VISIBILITY(default)62 namespace std _GLIBCXX_VISIBILITY(default)
63 {
64 _GLIBCXX_BEGIN_NAMESPACE_VERSION
65
66 namespace rel_ops
67 {
68 /** @namespace std::rel_ops
69 * @brief The generated relational operators are sequestered here.
70 *
71 * Libstdc++ headers must not use the contents of `rel_ops`.
72 * User code should also avoid them, because unconstrained function
73 * templates are too greedy and can easily cause ambiguities.
74 *
75 * C++20 default comparisons are a better solution.
76 */
77
78 /**
79 * @brief Defines @c != for arbitrary types, in terms of @c ==.
80 * @param __x A thing.
81 * @param __y Another thing.
82 * @return __x != __y
83 *
84 * This function uses @c == to determine its result.
85 */
86 template <class _Tp>
87 inline bool
88 operator!=(const _Tp& __x, const _Tp& __y)
89 { return !(__x == __y); }
90
91 /**
92 * @brief Defines @c > for arbitrary types, in terms of @c <.
93 * @param __x A thing.
94 * @param __y Another thing.
95 * @return __x > __y
96 *
97 * This function uses @c < to determine its result.
98 */
99 template <class _Tp>
100 inline bool
101 operator>(const _Tp& __x, const _Tp& __y)
102 { return __y < __x; }
103
104 /**
105 * @brief Defines @c <= for arbitrary types, in terms of @c <.
106 * @param __x A thing.
107 * @param __y Another thing.
108 * @return __x <= __y
109 *
110 * This function uses @c < to determine its result.
111 */
112 template <class _Tp>
113 inline bool
114 operator<=(const _Tp& __x, const _Tp& __y)
115 { return !(__y < __x); }
116
117 /**
118 * @brief Defines @c >= for arbitrary types, in terms of @c <.
119 * @param __x A thing.
120 * @param __y Another thing.
121 * @return __x >= __y
122 *
123 * This function uses @c < to determine its result.
124 */
125 template <class _Tp>
126 inline bool
127 operator>=(const _Tp& __x, const _Tp& __y)
128 { return !(__x < __y); }
129 } // namespace rel_ops
130
131 _GLIBCXX_END_NAMESPACE_VERSION
132 } // namespace std
133
134 #endif /* _STL_RELOPS_H */
135