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symboltable.hh
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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  * This file is part of Gecode, the generic constraint
10  * development environment:
11  * http://www.gecode.org
12  *
13  * Permission is hereby granted, free of charge, to any person obtaining
14  * a copy of this software and associated documentation files (the
15  * "Software"), to deal in the Software without restriction, including
16  * without limitation the rights to use, copy, modify, merge, publish,
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18  * permit persons to whom the Software is furnished to do so, subject to
19  * the following conditions:
20  *
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33 
34 #ifndef __GECODE_FLATZINC_SYMBOLTABLE_HH__
35 #define __GECODE_FLATZINC_SYMBOLTABLE_HH__
36 
37 #include <vector>
38 
39 #ifdef GECODE_HAS_UNORDERED_MAP
40 #include <unordered_map>
41 #elif defined(GECODE_HAS_GNU_HASH_MAP)
42 #include <ext/hash_map>
43 #else
44 #include <map>
45 #endif
46 
47 namespace Gecode { namespace FlatZinc {
48 
50  template<class Val>
51  class SymbolTable {
52  private:
53 #ifdef GECODE_HAS_UNORDERED_MAP
54  typedef std::unordered_map<std::string,Val> mymap;
55 #elif defined(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
Gecode::IntArgs i({1, 2, 3, 4})
Symbol table mapping identifiers (strings) to values.
Definition: symboltable.hh:51
bool get(const std::string &key, Val &val) const
Return whether key exists, and set val if it does exist.
Definition: symboltable.hh:85
bool put(const std::string &key, const Val &val)
Insert val with key.
Definition: symboltable.hh:76
Post propagator for SetVar x
Definition: set.hh:767
Gecode toplevel namespace