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 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 utility
{
  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*);

  }

}

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

#endif // ! VCSN_MISC_UNIQUE_HH

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