entry_cmp.hpp revision 1.1 
1// -*- C++ -*-
2
3// Copyright (C) 2005, 2006, 2009 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 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
49    template<typename Value_Type,
50	     class Cmp_Fn,
51	     bool No_Throw,
52	     class Allocator>
53    struct entry_cmp
54    {
55      typedef Cmp_Fn type;
56    };
57
58    template<typename Value_Type, class Cmp_Fn, class Allocator>
59    struct entry_cmp<
60      Value_Type,
61      Cmp_Fn,
62      false,
63      Allocator>
64    {
65    public:
66      typedef
67      typename Allocator::template rebind<
68      Value_Type>::other::const_pointer
69      entry;
70
71      struct type : public Cmp_Fn
72      {
73      public:
74	inline
75	type()
76	{ }
77
78	inline
79	type(const Cmp_Fn& other) : Cmp_Fn(other)
80	{ }
81
82	inline bool
83	operator()(entry p_lhs,  entry p_rhs) const
84	{
85	  return Cmp_Fn::operator()(*p_lhs, * p_rhs);
86	}
87      };
88    };
89
90  } // namespace detail
91} // namespace __gnu_pbds
92
93#endif // #ifndef PB_DS_BINARY_HEAP_ENTRY_CMP_HPP
94