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  1. // -*- C++ -*-
  2.  
  3. // Copyright (C) 2005-2015 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 terms
  7. // of the GNU General Public License as published by the Free Software
  8. // Foundation; either version 3, or (at your option) any later
  9. // version.
  10.  
  11. // This library is distributed in the hope that it will be useful, but
  12. // WITHOUT ANY WARRANTY; without even the implied warranty of
  13. // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14. // 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 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. // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
  26.  
  27. // Permission to use, copy, modify, sell, and distribute this software
  28. // is hereby granted without fee, provided that the above copyright
  29. // notice appears in all copies, and that both that copyright notice
  30. // and this permission notice appear in supporting documentation. None
  31. // of the above authors, nor IBM Haifa Research Laboratories, make any
  32. // representation about the suitability of this software for any
  33. // purpose. It is provided "as is" without express or implied
  34. // warranty.
  35.  
  36. /**
  37.  * @file eq_by_less.hpp
  38.  * Contains an equivalence function.
  39.  */
  40.  
  41. #ifndef PB_DS_EQ_BY_LESS_HPP
  42. #define PB_DS_EQ_BY_LESS_HPP
  43.  
  44. #include <utility>
  45. #include <functional>
  46. #include <vector>
  47. #include <assert.h>
  48. #include <ext/pb_ds/detail/types_traits.hpp>
  49.  
  50. namespace __gnu_pbds
  51. {
  52.   namespace detail
  53.   {
  54.     /// Equivalence function.
  55.     template<typename Key, class Cmp_Fn>
  56.     struct eq_by_less : private Cmp_Fn
  57.     {
  58.       bool
  59.       operator()(const Key& r_lhs, const Key& r_rhs) const
  60.       {
  61.         const bool l = Cmp_Fn::operator()(r_lhs, r_rhs);
  62.         const bool g = Cmp_Fn::operator()(r_rhs, r_lhs);
  63.         return !(l || g);
  64.       }
  65.     };
  66.   } // namespace detail
  67. } // namespace __gnu_pbds
  68.  
  69. #endif // #ifndef PB_DS_EQ_BY_LESS_HPP
  70.