libstdc++

entry_cmp.hpp
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1 // -*- C++ -*-
2
3 // Copyright (C) 2005-2013 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