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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 binary_heap_/entry_cmp.hpp
  38.  * Contains an implementation class for a binary_heap.
  39.  */
  40.  
  41. #ifndef PB_DS_BINARY_HEAP_ENTRY_CMP_HPP
  42. #define PB_DS_BINARY_HEAP_ENTRY_CMP_HPP
  43.  
  44. namespace __gnu_pbds
  45. {
  46.   namespace detail
  47.   {
  48.     /// Entry compare, primary template.
  49.     template<typename _VTp, typename Cmp_Fn, typename _Alloc, bool No_Throw>
  50.       struct entry_cmp;
  51.  
  52.     /// Specialization, true.
  53.     template<typename _VTp, typename Cmp_Fn, typename _Alloc>
  54.       struct entry_cmp<_VTp, Cmp_Fn, _Alloc, true>
  55.       {
  56.         /// Compare.
  57.         typedef Cmp_Fn                                          type;
  58.       };
  59.  
  60.     /// Specialization, false.
  61.     template<typename _VTp, typename Cmp_Fn, typename _Alloc>
  62.       struct entry_cmp<_VTp, Cmp_Fn, _Alloc, false>
  63.       {
  64.       private:
  65.         typedef typename _Alloc::template rebind<_VTp>          __rebind_v;
  66.  
  67.       public:
  68.         typedef typename __rebind_v::other::const_pointer       entry;
  69.  
  70.         /// Compare plus entry.
  71.         struct type : public Cmp_Fn
  72.         {
  73.           type() { }
  74.  
  75.           type(const Cmp_Fn& other) : Cmp_Fn(other) { }
  76.  
  77.           bool
  78.           operator()(entry lhs, entry rhs) const
  79.           { return Cmp_Fn::operator()(*lhs, *rhs); }
  80.         };
  81.       };
  82.   } // namespace detail
  83. } // namespace __gnu_pbds
  84.  
  85. #endif // #ifndef PB_DS_BINARY_HEAP_ENTRY_CMP_HPP
  86.