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// -*- C++ -*-

// Copyright (C) 2005 Free Software Foundation, Inc.

//

// This file is part of the GNU ISO C++ Library.  This library 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, or (at your option)

// any later version.

// This library 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 library; see the file COPYING.  If not, write to the Free

// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,

// USA.

// As a special exception, you may use this file as part of a free software

// library without restriction.  Specifically, if other files instantiate

// templates or use macros or inline functions from this file, or you compile

// this file and link it with other files to produce an executable, this

// file does not by itself cause the resulting executable to be covered by

// the GNU General Public License.  This exception does not however

// invalidate any other reasons why the executable file might be covered by

// the GNU General Public License.

// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.

// Permission to use, copy, modify, sell, and distribute this software

// is hereby granted without fee, provided that the above copyright

// notice appears in all copies, and that both that copyright notice and

// this permission notice appear in supporting documentation. None of

// the above authors, nor IBM Haifa Research Laboratories, make any

// representation about the suitability of this software for any

// purpose. It is provided "as is" without express or implied warranty.

/**

 * @file lu_policy.hpp

 * Contains policies for list update containers.

 */

#ifndef LU_POLICY_HPP

#define LU_POLICY_HPP

namespace pb_assoc

{

  struct move_to_front_lu_metadata

  { };

#define PB_ASSOC_CLASS_T_DEC \

        template<typename Metadata_Reference>

#define PB_ASSOC_CLASS_C_DEC \

        move_to_front_lu_policy<Metadata_Reference>

  template<typename Metadata_Reference =

           std::allocator<move_to_front_lu_metadata>::reference>

    class move_to_front_lu_policy

    {

    public:

      void

      swap(PB_ASSOC_CLASS_C_DEC& r_other);

    protected:

      typedef move_to_front_lu_metadata metadata_type;

      typedef Metadata_Reference metadata_reference;

      metadata_type

      operator()() const;

      inline bool

      operator()(metadata_reference r_data) const;

    };

#include <ext/pb_assoc/detail/lu_policy/mtf_lu_policy_imp.hpp>

#undef PB_ASSOC_CLASS_T_DEC

#undef PB_ASSOC_CLASS_C_DEC

  template<typename Size_Type>

    class counter_lu_policy_base;

  template<typename Size_Type = size_t>

    class counter_lu_metadata

    {

    public:

      typedef Size_Type size_type;

  private:

      counter_lu_metadata(size_type init_count) : m_count(init_count)

      { }

      mutable size_type m_count;

      friend class counter_lu_policy_base<Size_Type>;

    };

  template<typename Size_Type>

    class counter_lu_policy_base;

#define PB_ASSOC_CLASS_T_DEC \

        template<typename Size_Type>

#define PB_ASSOC_CLASS_C_DEC \

        counter_lu_policy_base<Size_Type>

  template<typename Size_Type>

    class counter_lu_policy_base

    {

    protected:

      typedef Size_Type size_type;

    counter_lu_metadata<Size_Type>

    operator()(size_type max_size) const;

    template<typename Metadata_Reference>

      bool

      operator()(Metadata_Reference r_data, size_type m_max_count) const;

    };

#include <ext/pb_assoc/detail/lu_policy/counter_lu_metadata_imp.hpp>

#undef PB_ASSOC_CLASS_T_DEC

#undef PB_ASSOC_CLASS_C_DEC

#define PB_ASSOC_CLASS_T_DEC \

        template<typename Size_Type, typename Metadata_Reference>

#define PB_ASSOC_CLASS_C_DEC \

        counter_lu_policy<Size_Type, Metadata_Reference>

  template<typename Size_Type = size_t,

           typename Metadata_Reference =

           typename std::allocator<counter_lu_metadata<Size_Type> >::reference>

    class counter_lu_policy : private counter_lu_policy_base<Size_Type>

    {

    public:

      typedef Size_Type size_type;

      counter_lu_policy(size_type max_count = 5);

      void

      swap(PB_ASSOC_CLASS_C_DEC& r_other);

      inline

      size_type

      get_max_count() const;

    protected:

      typedef counter_lu_metadata< Size_Type> metadata_type;

      typedef Metadata_Reference metadata_reference;

      metadata_type

      operator()() const;

      bool

      operator()(metadata_reference r_data) const;

    private:

      typedef counter_lu_policy_base< Size_Type> my_base;

      size_type m_max_count;

    };

#include <ext/pb_assoc/detail/lu_policy/counter_lu_policy_imp.hpp>

#undef PB_ASSOC_CLASS_T_DEC

#undef PB_ASSOC_CLASS_C_DEC

} // namespace pb_assoc

#endif // #ifndef LU_POLICY_HPP