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ultra_embe |
// -*- C++ -*-
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// Copyright (C) 2005, 2006, 2007, 2009, 2010, 2011
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// Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the terms
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// of the GNU General Public License as published by the Free Software
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// Foundation; either version 3, or (at your option) any later
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// version.
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// This library is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
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// Permission to use, copy, modify, sell, and distribute this software
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// is hereby granted without fee, provided that the above copyright
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// notice appears in all copies, and that both that copyright notice
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// and this permission notice appear in supporting documentation. None
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// of the above authors, nor IBM Haifa Research Laboratories, make any
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// representation about the suitability of this software for any
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// purpose. It is provided "as is" without express or implied
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// warranty.
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/**
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* @file lu_counter_metadata.hpp
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* Contains implementation of a lu counter policy's metadata.
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*/
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namespace __gnu_pbds
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{
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namespace detail
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{
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template<typename Size_Type>
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class lu_counter_policy_base;
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/// A list-update metadata type that moves elements to the front of
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/// the list based on the counter algorithm.
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template<typename Size_Type = std::size_t>
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class lu_counter_metadata
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{
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public:
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typedef Size_Type size_type;
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private:
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lu_counter_metadata(size_type init_count) : m_count(init_count)
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{ }
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friend class lu_counter_policy_base<size_type>;
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mutable size_type m_count;
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};
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/// Base class for list-update counter policy.
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template<typename Size_Type>
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class lu_counter_policy_base
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{
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protected:
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typedef Size_Type size_type;
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lu_counter_metadata<size_type>
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operator()(size_type max_size) const
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{ return lu_counter_metadata<Size_Type>(std::rand() % max_size); }
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template<typename Metadata_Reference>
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bool
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operator()(Metadata_Reference r_data, size_type m_max_count) const
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{
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if (++r_data.m_count != m_max_count)
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return false;
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r_data.m_count = 0;
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return true;
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}
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};
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} // namespace detail
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} // namespace __gnu_pbds
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