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  1. // std::rel_ops implementation -*- C++ -*-
  2.  
  3. // Copyright (C) 2001-2015 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.  *  Inclusion of this file has been removed from
  56.  *  all of the other STL headers for safety reasons, except std_utility.h.
  57.  *  For more information, see the thread of about twenty messages starting
  58.  *  with http://gcc.gnu.org/ml/libstdc++/2001-01/msg00223.html, or
  59.  *  http://gcc.gnu.org/onlinedocs/libstdc++/faq.html#faq.ambiguous_overloads
  60.  *
  61.  *  Short summary: the rel_ops operators should be avoided for the present.
  62.  */
  63.  
  64. #ifndef _STL_RELOPS_H
  65. #define _STL_RELOPS_H 1
  66.  
  67. namespace std _GLIBCXX_VISIBILITY(default)
  68. {
  69.   namespace rel_ops
  70.   {
  71.   _GLIBCXX_BEGIN_NAMESPACE_VERSION
  72.  
  73.     /** @namespace std::rel_ops
  74.      *  @brief  The generated relational operators are sequestered here.
  75.      */
  76.  
  77.     /**
  78.      *  @brief Defines @c != for arbitrary types, in terms of @c ==.
  79.      *  @param  __x  A thing.
  80.      *  @param  __y  Another thing.
  81.      *  @return   __x != __y
  82.      *
  83.      *  This function uses @c == to determine its result.
  84.      */
  85.     template <class _Tp>
  86.       inline bool
  87.       operator!=(const _Tp& __x, const _Tp& __y)
  88.       { return !(__x == __y); }
  89.  
  90.     /**
  91.      *  @brief Defines @c > for arbitrary types, in terms of @c <.
  92.      *  @param  __x  A thing.
  93.      *  @param  __y  Another thing.
  94.      *  @return   __x > __y
  95.      *
  96.      *  This function uses @c < to determine its result.
  97.      */
  98.     template <class _Tp>
  99.       inline bool
  100.       operator>(const _Tp& __x, const _Tp& __y)
  101.       { return __y < __x; }
  102.  
  103.     /**
  104.      *  @brief Defines @c <= for arbitrary types, in terms of @c <.
  105.      *  @param  __x  A thing.
  106.      *  @param  __y  Another thing.
  107.      *  @return   __x <= __y
  108.      *
  109.      *  This function uses @c < to determine its result.
  110.      */
  111.     template <class _Tp>
  112.       inline bool
  113.       operator<=(const _Tp& __x, const _Tp& __y)
  114.       { return !(__y < __x); }
  115.  
  116.     /**
  117.      *  @brief Defines @c >= for arbitrary types, in terms of @c <.
  118.      *  @param  __x  A thing.
  119.      *  @param  __y  Another thing.
  120.      *  @return   __x >= __y
  121.      *
  122.      *  This function uses @c < to determine its result.
  123.      */
  124.     template <class _Tp>
  125.       inline bool
  126.       operator>=(const _Tp& __x, const _Tp& __y)
  127.       { return !(__x < __y); }
  128.  
  129.   _GLIBCXX_END_NAMESPACE_VERSION
  130.   } // namespace rel_ops
  131.  
  132. } // namespace std
  133.  
  134. #endif /* _STL_RELOPS_H */
  135.