libstdc++
stl_relops.h
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1 // std::rel_ops implementation -*- C++ -*-
2 
3 // Copyright (C) 2001, 2002, 2004, 2005, 2008, 2010, 2011
4 // Free Software Foundation, Inc.
5 //
6 // This file is part of the GNU ISO C++ Library. This library is free
7 // software; you can redistribute it and/or modify it under the
8 // terms of the GNU General Public License as published by the
9 // Free Software Foundation; either version 3, or (at your option)
10 // any later version.
11 
12 // This library is distributed in the hope that it will be useful,
13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 // GNU General Public License for more details.
16 
17 // Under Section 7 of GPL version 3, you are granted additional
18 // permissions described in the GCC Runtime Library Exception, version
19 // 3.1, as published by the, 2009 Free Software Foundation.
20 
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22 // a copy of the GCC Runtime Library Exception along with this program;
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25 
26 /*
27  *
28  * Copyright (c) 1994
29  * Hewlett-Packard Company
30  *
31  * Permission to use, copy, modify, distribute and sell this software
32  * and its documentation for any purpose is hereby granted without fee,
33  * provided that the above copyright notice appear in all copies and
34  * that both that copyright notice and this permission notice appear
35  * in supporting documentation. Hewlett-Packard Company makes no
36  * representations about the suitability of this software for any
37  * purpose. It is provided "as is" without express or implied warranty.
38  *
39  * Copyright (c) 1996,1997
40  * Silicon Graphics
41  *
42  * Permission to use, copy, modify, distribute and sell this software
43  * and its documentation for any purpose is hereby granted without fee,
44  * provided that the above copyright notice appear in all copies and
45  * that both that copyright notice and this permission notice appear
46  * in supporting documentation. Silicon Graphics makes no
47  * representations about the suitability of this software for any
48  * purpose. It is provided "as is" without express or implied warranty.
49  *
50  */
51 
52 /** @file bits/stl_relops.h
53  * This is an internal header file, included by other library headers.
54  * Do not attempt to use it directly. @headername{utility}
55  *
56  * Inclusion of this file has been removed from
57  * all of the other STL headers for safety reasons, except std_utility.h.
58  * For more information, see the thread of about twenty messages starting
59  * with http://gcc.gnu.org/ml/libstdc++/2001-01/msg00223.html, or
60  * http://gcc.gnu.org/onlinedocs/libstdc++/faq.html#faq.ambiguous_overloads
61  *
62  * Short summary: the rel_ops operators should be avoided for the present.
63  */
64 
65 #ifndef _STL_RELOPS_H
66 #define _STL_RELOPS_H 1
67 
68 namespace std _GLIBCXX_VISIBILITY(default)
69 {
70  namespace rel_ops
71  {
72  _GLIBCXX_BEGIN_NAMESPACE_VERSION
73 
74  /** @namespace std::rel_ops
75  * @brief The generated relational operators are sequestered here.
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 
130  _GLIBCXX_END_NAMESPACE_VERSION
131  } // namespace rel_ops
132 
133 } // namespace std
134 
135 #endif /* _STL_RELOPS_H */