null-value.hpp

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/*
  NULL-VALUE.hpp  -  maintain per-type NIL values in static memory 

  Copyright (C)         Lumiera.org
    2010,               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_NULL_VALUE_H
#define LIB_NULL_VALUE_H



namespace lib {
  
  template<class TY>
  struct NullValue
    {
      static TY const&
      get()
        {
          static TY nilValue;
          return nilValue;
        }
    };
  
  
  
} // namespace lib
#endif