letter.hh

// letter.hh: this file is part of the Vaucanson project.
//
// Vaucanson, a generic library for finite state machines.
//
// Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2008 The
// Vaucanson Group.
//
// 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.
//
// The complete GNU General Public Licence Notice can be found as the
// `COPYING' file in the root directory.
//
// The Vaucanson Group consists of people listed in the `AUTHORS' file.
//
#ifndef VCSN_ALGEBRA_CONCEPT_LETTER_HH
# define VCSN_ALGEBRA_CONCEPT_LETTER_HH

# include <string>

# include <vaucanson/misc/static.hh>

namespace vcsn {

  namespace algebra {

    template <class L>
    struct letter_traits
    {
      // Default value
      enum
        {
          cardinal = misc::static_pow<2, sizeof(L) * 8>::value
        };


      static L literal_to_letter(const std::string&)
      {
        return 0;
      }

      static std::string letter_to_literal(const L&)
      {
        return 0;
      }

      static char default_epsilon()
      {
        return '1';
      }
    };

  } // ! algebra

} // ! vcsn

#endif // ! VCSN_ALGEBRA_CONCEPT_LETTER_HH

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