symboltable.hh

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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
 *  Main authors:
 *     Guido Tack <tack@gecode.org>
 *
 *  Copyright:
 *     Guido Tack, 2007
 *
 *  Last modified:
 *     $Date: 2010-07-28 16:43:32 +0200 (Wed, 28 Jul 2010) $ by $Author: tack $
 *     $Revision: 11293 $
 *
 *  This file is part of Gecode, the generic constraint
 *  development environment:
 *     http://www.gecode.org
 *
 *  Permission is hereby granted, free of charge, to any person obtaining
 *  a copy of this software and associated documentation files (the
 *  "Software"), to deal in the Software without restriction, including
 *  without limitation the rights to use, copy, modify, merge, publish,
 *  distribute, sublicense, and/or sell copies of the Software, and to
 *  permit persons to whom the Software is furnished to do so, subject to
 *  the following conditions:
 *
 *  The above copyright notice and this permission notice shall be
 *  included in all copies or substantial portions of the Software.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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 */

#ifndef __GECODE_FLATZINC_SYMBOLTABLE_HH__
#define __GECODE_FLATZINC_SYMBOLTABLE_HH__

#include <vector>

#ifdef GECODE_HAS_GNU_HASH_MAP
#include <ext/hash_map>
#else
#include <map>
#endif

namespace Gecode { namespace FlatZinc {

  template<class Val>
  class SymbolTable {
  private:
#ifdef GECODE_HAS_GNU_HASH_MAP
    class hashString {
    public:
      size_t operator ()(const std::string& x) const {
        return __gnu_cxx::hash<const char*>()(x.c_str());
      }
    };
    typedef __gnu_cxx::hash_map<std::string,Val,hashString> mymap;
#else
    typedef std::map<std::string,Val> mymap;
#endif
    mymap m;
  public:
    bool put(const std::string& key, const Val& val);
    bool get(const std::string& key, Val& val) const;
  };

  template<class Val>
  bool
  SymbolTable<Val>::put(const std::string& key, const Val& val) {
    typename mymap::const_iterator i = m.find(key);
    bool fresh = (i == m.end());
    m[key] = val;
    return fresh;
  }

  template<class Val>
  bool
  SymbolTable<Val>::get(const std::string& key, Val& val) const {
    typename mymap::const_iterator i = m.find(key);
    if (i == m.end())
      return false;
    val = i->second;
    return true;
  }

}}
#endif

// STATISTICS: flatzinc-any