// -*- C++ -*-
|
// -*- C++ -*-
|
|
|
// Copyright (C) 2005, 2006, 2007, 2009 Free Software Foundation, Inc.
|
// Copyright (C) 2005, 2006, 2007, 2009 Free Software Foundation, Inc.
|
//
|
//
|
// This file is part of the GNU ISO C++ Library. This library is free
|
// 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
|
// software; you can redistribute it and/or modify it under the terms
|
// of the GNU General Public License as published by the Free Software
|
// of the GNU General Public License as published by the Free Software
|
// Foundation; either version 3, or (at your option) any later
|
// Foundation; either version 3, or (at your option) any later
|
// version.
|
// version.
|
|
|
// This library is distributed in the hope that it will be useful, but
|
// This library is distributed in the hope that it will be useful, but
|
// WITHOUT ANY WARRANTY; without even the implied warranty of
|
// WITHOUT ANY WARRANTY; without even the implied warranty of
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
// General Public License for more details.
|
// General Public License for more details.
|
|
|
// Under Section 7 of GPL version 3, you are granted additional
|
// Under Section 7 of GPL version 3, you are granted additional
|
// permissions described in the GCC Runtime Library Exception, version
|
// permissions described in the GCC Runtime Library Exception, version
|
// 3.1, as published by the Free Software Foundation.
|
// 3.1, as published by the Free Software Foundation.
|
|
|
// You should have received a copy of the GNU General Public License and
|
// 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;
|
// a copy of the GCC Runtime Library Exception along with this program;
|
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
|
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
|
// <http://www.gnu.org/licenses/>.
|
// <http://www.gnu.org/licenses/>.
|
|
|
// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
|
// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
|
|
|
// Permission to use, copy, modify, sell, and distribute this software
|
// Permission to use, copy, modify, sell, and distribute this software
|
// is hereby granted without fee, provided that the above copyright
|
// is hereby granted without fee, provided that the above copyright
|
// notice appears in all copies, and that both that copyright notice
|
// notice appears in all copies, and that both that copyright notice
|
// and this permission notice appear in supporting documentation. None
|
// and this permission notice appear in supporting documentation. None
|
// of the above authors, nor IBM Haifa Research Laboratories, make any
|
// of the above authors, nor IBM Haifa Research Laboratories, make any
|
// representation about the suitability of this software for any
|
// representation about the suitability of this software for any
|
// purpose. It is provided "as is" without express or implied
|
// purpose. It is provided "as is" without express or implied
|
// warranty.
|
// warranty.
|
|
|
/**
|
/**
|
* @file counter_lu_metadata.hpp
|
* @file counter_lu_metadata.hpp
|
* Contains implementation of a lu counter policy's metadata.
|
* Contains implementation of a lu counter policy's metadata.
|
*/
|
*/
|
|
|
namespace __gnu_pbds
|
namespace __gnu_pbds
|
{
|
{
|
namespace detail
|
namespace detail
|
{
|
{
|
template<typename Size_Type>
|
template<typename Size_Type>
|
class counter_lu_policy_base;
|
class counter_lu_policy_base;
|
|
|
// A list-update metadata type that moves elements to the front of
|
// A list-update metadata type that moves elements to the front of
|
// the list based on the counter algorithm.
|
// the list based on the counter algorithm.
|
template<typename Size_Type = size_t>
|
template<typename Size_Type = size_t>
|
class counter_lu_metadata
|
class counter_lu_metadata
|
{
|
{
|
public:
|
public:
|
typedef Size_Type size_type;
|
typedef Size_Type size_type;
|
|
|
private:
|
private:
|
counter_lu_metadata(size_type init_count) : m_count(init_count)
|
counter_lu_metadata(size_type init_count) : m_count(init_count)
|
{ }
|
{ }
|
|
|
friend class counter_lu_policy_base<size_type>;
|
friend class counter_lu_policy_base<size_type>;
|
|
|
mutable size_type m_count;
|
mutable size_type m_count;
|
};
|
};
|
|
|
template<typename Size_Type>
|
template<typename Size_Type>
|
class counter_lu_policy_base
|
class counter_lu_policy_base
|
{
|
{
|
protected:
|
protected:
|
typedef Size_Type size_type;
|
typedef Size_Type size_type;
|
|
|
counter_lu_metadata<size_type>
|
counter_lu_metadata<size_type>
|
operator()(size_type max_size) const
|
operator()(size_type max_size) const
|
{ return counter_lu_metadata<Size_Type>(std::rand() % max_size); }
|
{ return counter_lu_metadata<Size_Type>(std::rand() % max_size); }
|
|
|
template<typename Metadata_Reference>
|
template<typename Metadata_Reference>
|
bool
|
bool
|
operator()(Metadata_Reference r_data, size_type m_max_count) const
|
operator()(Metadata_Reference r_data, size_type m_max_count) const
|
{
|
{
|
if (++r_data.m_count != m_max_count)
|
if (++r_data.m_count != m_max_count)
|
return false;
|
return false;
|
r_data.m_count = 0;
|
r_data.m_count = 0;
|
return true;
|
return true;
|
}
|
}
|
};
|
};
|
} // namespace detail
|
} // namespace detail
|
} // namespace __gnu_pbds
|
} // namespace __gnu_pbds
|
|
|