slots.hh

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// slots.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_DESIGN_PATTERN_SLOTS_HH
# define VCSN_DESIGN_PATTERN_SLOTS_HH

# include <vaucanson/design_pattern/predecls.hh>

namespace vcsn {

  /*------------------------------.
  | Basic class for SetSlot below |
  `------------------------------*/

  template<typename S, bool dynamic /* default: false */>
  struct SetSlotAttribute
  {

    SetSlotAttribute();
    SetSlotAttribute(const SetSlotAttribute& other);
    SetSlotAttribute(const S& other);

    const S&    _structure_get() const;


    void        _structure_assign(const SetSlotAttribute& other);

    void        _structure_attach(const S& other);

    bool        _structure_bound() const;
  };

  template<typename S>
  struct SetSlotAttribute<S, true>
  {
    SetSlotAttribute();

    SetSlotAttribute(const SetSlotAttribute& other);

    SetSlotAttribute(const S& other);

    const S&    _structure_get() const;


    void        _structure_assign(const SetSlotAttribute& other);
    void        _structure_attach(const S& s);

    bool        _structure_bound() const;

  protected:
    const S*    s_; 
  };


  /*------------------------------------.
  | Set attribute for the Element class |
  `------------------------------------*/

  template<typename S, typename Tag>
  struct SetSlot : SetSlotAttribute<S, dynamic_traits<S>::ret>
  {
    typedef Tag tag_type;


    SetSlot();
    SetSlot(const SetSlot& other);
    SetSlot(const S& other);
  };

}

# ifndef VCSN_USE_INTERFACE_ONLY
#  include <vaucanson/design_pattern/slots.hxx>
# endif // VCSN_USE_INTERFACE_ONLY

#endif // ! VCSN_DESIGN_PATTERN_SLOTS_HH

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