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symboltable.hh

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00001 /* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
00002 /*
00003  *  Main authors:
00004  *     Guido Tack <tack@gecode.org>
00005  *
00006  *  Copyright:
00007  *     Guido Tack, 2007
00008  *
00009  *  This file is part of Gecode, the generic constraint
00010  *  development environment:
00011  *     http://www.gecode.org
00012  *
00013  *  Permission is hereby granted, free of charge, to any person obtaining
00014  *  a copy of this software and associated documentation files (the
00015  *  "Software"), to deal in the Software without restriction, including
00016  *  without limitation the rights to use, copy, modify, merge, publish,
00017  *  distribute, sublicense, and/or sell copies of the Software, and to
00018  *  permit persons to whom the Software is furnished to do so, subject to
00019  *  the following conditions:
00020  *
00021  *  The above copyright notice and this permission notice shall be
00022  *  included in all copies or substantial portions of the Software.
00023  *
00024  *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
00025  *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
00026  *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
00027  *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
00028  *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
00029  *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
00030  *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
00031  *
00032  */
00033 
00034 #ifndef __GECODE_FLATZINC_SYMBOLTABLE_HH__
00035 #define __GECODE_FLATZINC_SYMBOLTABLE_HH__
00036 
00037 #include <vector>
00038 
00039 #ifdef GECODE_HAS_UNORDERED_MAP
00040 #include <unordered_map>
00041 #elif defined(GECODE_HAS_GNU_HASH_MAP)
00042 #include <ext/hash_map>
00043 #else
00044 #include <map>
00045 #endif
00046 
00047 namespace Gecode { namespace FlatZinc {
00048 
00050   template<class Val>
00051   class SymbolTable {
00052   private:
00053 #ifdef GECODE_HAS_UNORDERED_MAP
00054     typedef std::unordered_map<std::string,Val> mymap;
00055 #elif defined(GECODE_HAS_GNU_HASH_MAP)
00056     class hashString {
00057     public:
00058       size_t operator ()(const std::string& x) const {
00059         return __gnu_cxx::hash<const char*>()(x.c_str());
00060       }
00061     };
00062     typedef __gnu_cxx::hash_map<std::string,Val,hashString> mymap;
00063 #else
00064     typedef std::map<std::string,Val> mymap;
00065 #endif
00066     mymap m;
00067   public:
00069     bool put(const std::string& key, const Val& val);
00071     bool get(const std::string& key, Val& val) const;
00072   };
00073 
00074   template<class Val>
00075   bool
00076   SymbolTable<Val>::put(const std::string& key, const Val& val) {
00077     typename mymap::const_iterator i = m.find(key);
00078     bool fresh = (i == m.end());
00079     m[key] = val;
00080     return fresh;
00081   }
00082 
00083   template<class Val>
00084   bool
00085   SymbolTable<Val>::get(const std::string& key, Val& val) const {
00086     typename mymap::const_iterator i = m.find(key);
00087     if (i == m.end())
00088       return false;
00089     val = i->second;
00090     return true;
00091   }
00092 
00093 }}
00094 #endif
00095 
00096 // STATISTICS: flatzinc-any