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Edit File: counter_lu_metadata.hpp

// -*- C++ -*-

// Copyright (C) 2005, 2006, 2007, 2009 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 3, 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.

// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
// <http://www.gnu.org/licenses/>.

// 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 counter_lu_metadata.hpp
 * Contains implementation of a lu counter policy's metadata.
 */

namespace __gnu_pbds
{
  namespace detail
  {
    template<typename Size_Type>
    class counter_lu_policy_base;

// A list-update metadata type that moves elements to the front of
    // the list based on the counter algorithm.
    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)
      { }

friend class counter_lu_policy_base<size_type>;

mutable size_type m_count;
    };

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
      { return counter_lu_metadata<Size_Type>(std::rand() % max_size); }

template<typename Metadata_Reference>
      bool
      operator()(Metadata_Reference r_data, size_type m_max_count) const
      {
	if (++r_data.m_count != m_max_count)
	  return false;
	r_data.m_count = 0;
	return true;
      }
    };
  } // namespace detail
} // namespace __gnu_pbds

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