Generated on Fri Aug 31 2012 16:20:43 for Gecode by doxygen 1.8.1.2
symboltable.hh
Go to the documentation of this file.
1 /* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
2 /*
3  * Main authors:
4  * Guido Tack <tack@gecode.org>
5  *
6  * Copyright:
7  * Guido Tack, 2007
8  *
9  * Last modified:
10  * $Date: 2010-07-29 00:43:32 +1000 (Thu, 29 Jul 2010) $ by $Author: tack $
11  * $Revision: 11293 $
12  *
13  * This file is part of Gecode, the generic constraint
14  * development environment:
15  * http://www.gecode.org
16  *
17  * Permission is hereby granted, free of charge, to any person obtaining
18  * a copy of this software and associated documentation files (the
19  * "Software"), to deal in the Software without restriction, including
20  * without limitation the rights to use, copy, modify, merge, publish,
21  * distribute, sublicense, and/or sell copies of the Software, and to
22  * permit persons to whom the Software is furnished to do so, subject to
23  * the following conditions:
24  *
25  * The above copyright notice and this permission notice shall be
26  * included in all copies or substantial portions of the Software.
27  *
28  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
29  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
30  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
31  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
32  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
33  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
34  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
35  *
36  */
37 
38 #ifndef __GECODE_FLATZINC_SYMBOLTABLE_HH__
39 #define __GECODE_FLATZINC_SYMBOLTABLE_HH__
40 
41 #include <vector>
42 
43 #ifdef GECODE_HAS_GNU_HASH_MAP
44 #include <ext/hash_map>
45 #else
46 #include <map>
47 #endif
48 
49 namespace Gecode { namespace FlatZinc {
50 
52  template<class Val>
53  class SymbolTable {
54  private:
55 #ifdef GECODE_HAS_GNU_HASH_MAP
56  class hashString {
57  public:
58  size_t operator ()(const std::string& x) const {
59  return __gnu_cxx::hash<const char*>()(x.c_str());
60  }
61  };
62  typedef __gnu_cxx::hash_map<std::string,Val,hashString> mymap;
63 #else
64  typedef std::map<std::string,Val> mymap;
65 #endif
66  mymap m;
67  public:
69  bool put(const std::string& key, const Val& val);
71  bool get(const std::string& key, Val& val) const;
72  };
73 
74  template<class Val>
75  bool
76  SymbolTable<Val>::put(const std::string& key, const Val& val) {
77  typename mymap::const_iterator i = m.find(key);
78  bool fresh = (i == m.end());
79  m[key] = val;
80  return fresh;
81  }
82 
83  template<class Val>
84  bool
85  SymbolTable<Val>::get(const std::string& key, Val& val) const {
86  typename mymap::const_iterator i = m.find(key);
87  if (i == m.end())
88  return false;
89  val = i->second;
90  return true;
91  }
92 
93 }}
94 #endif
95 
96 // STATISTICS: flatzinc-any