unique.hh

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// unique.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 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_MISC_UNIQUE_HH
# define VCSN_MISC_UNIQUE_HH

# include <list>
# include <algorithm>
# include <typeinfo>
# include <map>

namespace vcsn
{
  namespace misc
  {
    namespace unique
    {
      template <class T>
      struct UniqueListBase
      {
          virtual ~UniqueListBase ();
      };

      typedef UniqueListBase<int> uniquelist_base;

      template <typename T>
      struct uniquelist : public std::list<T>, public uniquelist_base
      {
          ~uniquelist ();
      };

      template <class T>
      struct UniqueMap
      {
          template <class U>
          struct TiSlot
          {
              TiSlot (const std::type_info& );
              const std::type_info &id;
              bool operator== (const TiSlot& other) const;
              bool operator< (const TiSlot& other) const;
          };

          typedef TiSlot<int> ti_slot;

          typedef std::map<ti_slot, uniquelist_base*> map_t;

          static map_t& instance ();
        protected:
          map_t map_;
          UniqueMap ();
          ~UniqueMap ();
      };

      typedef UniqueMap<int> unique_map;

      struct unifiable
      {
          inline unifiable ();
          inline unifiable (const unifiable&);
        private:
          template <typename T>
          friend const T& get (const T&);
          bool unique_;
      };

      template <typename T>
      const T& get (const T&);

      template <typename T>
      const T* get (const T*);

    }

  } // misc
} // vcsn

# ifndef INTERFACE_ONLY
#  include <vaucanson/misc/unique.hxx>
# endif // INTERFACE_ONLY

#endif // ! VCSN_MISC_UNIQUE_HH

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