1// -*- C++ -*-
2
3// Copyright (C) 2005-2020 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
44namespace __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 rebind_traits<_Alloc, _VTp>		__rebind_v;
66
67      public:
68	typedef typename __rebind_v::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