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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 hash_eq_fn.hpp
  38.  * Contains 2 eqivalence functions, one employing a hash value,
  39.  * and one ignoring it.
  40.  */
  41.  
  42. #ifndef PB_DS_HASH_EQ_FN_HPP
  43. #define PB_DS_HASH_EQ_FN_HPP
  44.  
  45. #include <utility>
  46. #include <debug/debug.h>
  47.  
  48. namespace __gnu_pbds
  49. {
  50.   namespace detail
  51.   {
  52.     /// Primary template.
  53.     template<typename Key, typename Eq_Fn, typename _Alloc, bool Store_Hash>
  54.       struct hash_eq_fn;
  55.  
  56.     /// Specialization 1 - The client requests that hash values not be stored.
  57.     template<typename Key, typename Eq_Fn, typename _Alloc>
  58.     struct hash_eq_fn<Key, Eq_Fn, _Alloc, false> : public Eq_Fn
  59.     {
  60.       typedef Eq_Fn                                        eq_fn_base;
  61.       typedef typename _Alloc::template rebind<Key>::other key_allocator;
  62.       typedef typename key_allocator::const_reference      key_const_reference;
  63.  
  64.       hash_eq_fn() { }
  65.  
  66.       hash_eq_fn(const Eq_Fn& r_eq_fn) : Eq_Fn(r_eq_fn) { }
  67.  
  68.       bool
  69.       operator()(key_const_reference r_lhs_key,
  70.                  key_const_reference r_rhs_key) const
  71.       { return eq_fn_base::operator()(r_lhs_key, r_rhs_key); }
  72.  
  73.       void
  74.       swap(const hash_eq_fn& other)
  75.       { std::swap((Eq_Fn&)(*this), (Eq_Fn&)other); }
  76.     };
  77.  
  78.  
  79.     /// Specialization 2 - The client requests that hash values be stored.
  80.     template<typename Key, class Eq_Fn, class _Alloc>
  81.     struct hash_eq_fn<Key, Eq_Fn, _Alloc, true> : public Eq_Fn
  82.     {
  83.       typedef typename _Alloc::size_type                   size_type;
  84.       typedef Eq_Fn                                        eq_fn_base;
  85.       typedef typename _Alloc::template rebind<Key>::other key_allocator;
  86.       typedef typename key_allocator::const_reference      key_const_reference;
  87.  
  88.       hash_eq_fn() { }
  89.  
  90.       hash_eq_fn(const Eq_Fn& r_eq_fn) : Eq_Fn(r_eq_fn) { }
  91.  
  92.       bool
  93.       operator()(key_const_reference r_lhs_key, size_type lhs_hash,
  94.                  key_const_reference r_rhs_key, size_type rhs_hash) const
  95.       {
  96.         _GLIBCXX_DEBUG_ASSERT(!eq_fn_base::operator()(r_lhs_key, r_rhs_key)
  97.                               || lhs_hash == rhs_hash);
  98.  
  99.         return (lhs_hash == rhs_hash &&
  100.                 eq_fn_base::operator()(r_lhs_key, r_rhs_key));
  101.       }
  102.  
  103.       void
  104.       swap(const hash_eq_fn& other)
  105.       { std::swap((Eq_Fn&)(*this), (Eq_Fn&)(other)); }
  106.     };
  107.   } // namespace detail
  108. } // namespace __gnu_pbds
  109.  
  110. #endif
  111.