hash.hh 3.4 KB
Newer Older
1
// Copyright (C) 2008, 2011 Laboratoire de Recherche et Développement
Guillaume Sadegh's avatar
Guillaume Sadegh committed
2
3
// de l'Epita (LRDE).
// Copyright (C) 2003, 2004, 2005 Laboratoire d'Informatique de
4
5
// Paris 6 (LIP6), dpartement Systmes Rpartis Coopratifs (SRC),
// Universit Pierre et Marie Curie.
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
//
// This file is part of Spot, a model checking library.
//
// Spot is free software; you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// Spot is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
// or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
// License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Spot; see the file COPYING.  If not, write to the Free
// Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
// 02111-1307, USA.

24
25
26
#ifndef SPOT_MISC_HASH_HH
#  define SPOT_MISC_HASH_HH

27
#  include <string>
28
#  include <functional>
29
30
#  include "misc/hashfunc.hh"
#  include "misc/_config.h"
31

32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
#ifdef SPOT_HAVE_UNORDERED_MAP
#  include <unordered_map>
#  include <unordered_set>
   namespace Sgi = std;
#  define hash_map unordered_map
#  define hash_multimap unordered_multimap
#  define hash_set unordered_set
#else
#ifdef SPOT_HAVE_TR1_UNORDERED_MAP
#  include <tr1/unordered_map>
#  include <tr1/unordered_set>
   namespace Sgi = std::tr1;
#  define hash_map unordered_map
#  define hash_multimap unordered_multimap
#  define hash_set unordered_set
#else
#ifdef SPOT_HAVE_EXT_HASH_MAP
#  include <ext/hash_map>
#  include <ext/hash_set>
#  if __GNUC__ == 3 && __GNUC_MINOR__ == 0
     namespace Sgi = std;               // GCC 3.0
#  else
     namespace Sgi = ::__gnu_cxx;       // GCC 3.1 to 4.2
#  endif
#else
#  if defined(__GNUC__) && (__GNUC__ < 3)
58
59
#    include <hash_map.h>
#    include <hash_set.h>
60
61
62
    namespace Sgi
    { // inherit globals
      using ::hash_map;
63
      using ::hash_multimap;
64
65
      using ::hash_set;
      using ::hash;
66
    }
67
68
69
70
71
#  else
#   include <hash_map>
#   include <hash_set>
    namespace Sgi = std;
#  endif
72
73
74
#endif
#endif
#endif
75
76
77
78

namespace spot
{

79
80
  /// \brief A hash function for pointers.
  /// \ingroup hash_funcs
81
  template <class T>
82
83
  struct ptr_hash :
    public std::unary_function<const T*, size_t>
84
  {
85
    size_t operator()(const T* p) const
86
    {
87
88
      return knuth32_hash(reinterpret_cast<const char*>(p)
			  - static_cast<const char*>(0));
89
90
91
    }
  };

92
93
  /// \brief A hash function for strings.
  /// \ingroup hash_funcs
94
  /// @{
95
96
97
#if defined(SPOT_HAVE_UNORDERED_MAP) || defined(SPOT_HAVE_TR1_UNORDERED_MAP)
  typedef Sgi::hash<std::string> string_hash;
#else // e.g. GCC < 4.3
98
  struct string_hash:
99
100
    public Sgi::hash<const char*>,
    public std::unary_function<const std::string&, size_t>
101
102
103
104
105
106
  {
    size_t operator()(const std::string& s) const
    {
      // We are living dangerously.  Be sure to call operator()
      // from the super-class, not this one.
      return Sgi::hash<const char*>::operator()(s.c_str());
107
108
    }
  };
109
  /// @}
110
#endif
111
112
113
114
115
116
117
118
119
120
121
122

  /// \brief A hash function that returns identity
  /// \ingroup hash_funcs
  template<typename T>
  struct identity_hash:
    public std::unary_function<const T&, size_t>
  {
    size_t operator()(const T& s) const
    {
      return s;
    }
  };
123
124
125
}

#endif // SPOT_MISC_HASH_HH