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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
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9  * Last modified:
10  * $Date: 2014-11-05 00:52:18 +0100 (Wed, 05 Nov 2014) $ by $Author: tack $
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37 
38 #ifndef __GECODE_FLATZINC_SYMBOLTABLE_HH__
39 #define __GECODE_FLATZINC_SYMBOLTABLE_HH__
40 
41 #include <vector>
42 
43 #ifdef GECODE_HAS_UNORDERED_MAP
44 #include <unordered_map>
45 #elif defined(GECODE_HAS_GNU_HASH_MAP)
46 #include <ext/hash_map>
47 #else
48 #include <map>
49 #endif
50 
51 namespace Gecode { namespace FlatZinc {
52 
54  template<class Val>
55  class SymbolTable {
56  private:
57 #ifdef GECODE_HAS_UNORDERED_MAP
58  typedef std::unordered_map<std::string,Val> mymap;
59 #elif defined(GECODE_HAS_GNU_HASH_MAP)
60  class hashString {
61  public:
62  size_t operator ()(const std::string& x) const {
63  return __gnu_cxx::hash<const char*>()(x.c_str());
64  }
65  };
66  typedef __gnu_cxx::hash_map<std::string,Val,hashString> mymap;
67 #else
68  typedef std::map<std::string,Val> mymap;
69 #endif
70  mymap m;
71  public:
73  bool put(const std::string& key, const Val& val);
75  bool get(const std::string& key, Val& val) const;
76  };
77 
78  template<class Val>
79  bool
80  SymbolTable<Val>::put(const std::string& key, const Val& val) {
81  typename mymap::const_iterator i = m.find(key);
82  bool fresh = (i == m.end());
83  m[key] = val;
84  return fresh;
85  }
86 
87  template<class Val>
88  bool
89  SymbolTable<Val>::get(const std::string& key, Val& val) const {
90  typename mymap::const_iterator i = m.find(key);
91  if (i == m.end())
92  return false;
93  val = i->second;
94  return true;
95  }
96 
97 }}
98 #endif
99 
100 // STATISTICS: flatzinc-any
Gecode::IntArgs i(4, 1, 2, 3, 4)
Symbol table mapping identifiers (strings) to values.
Definition: symboltable.hh:55
bool get(const std::string &key, Val &val) const
Return whether key exists, and set val if it does exist.
Definition: symboltable.hh:89
bool put(const std::string &key, const Val &val)
Insert val with key.
Definition: symboltable.hh:80
Node * x
Pointer to corresponding Boolean expression node.
Definition: bool-expr.cpp:253
Gecode toplevel namespace