symbol-table.hpp

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/*
  SYMBOL-TABLE.hpp  -  registry for automatically interned symbol string tokens 

  Copyright (C)         Lumiera.org
    2017,               Hermann Vosseler <Ichthyostega@web.de>

  This program is free software; you can redistribute it and/or
  modify it under the terms of the GNU General Public License as
  published by the Free Software Foundation; either version 2 of
  the License, or (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

#ifndef LIB_SYMBOL_TABLE_H
#define LIB_SYMBOL_TABLE_H

#include "lib/sync.hpp"
#include "lib/symbol.hpp"
#include "lib/nocopy.hpp"

#include <unordered_set>
#include <utility>
#include <string>


namespace lib {
  
  using std::string;
  using std::forward;
  
  
  class SymbolTable
    : public Sync<>
    , util::NonCopyable
    {
      std::unordered_set<string> table_;
      
    public:
      Literal
      internedString (string && symbolString)
        {
          Lock sync{this};
          auto res = table_.insert (forward<string> (symbolString));
          return res.first->c_str();
        }
    };
  
  
  
} // namespace lib
#endif /*LIB_SYMBOL_TABLE_H*/