3 // Copyright (C) 2005, 2006, 2007, 2009, 2010 Free Software Foundation, Inc.
5 // This file is part of the GNU ISO C++ Library. This library is free
6 // software; you can redistribute it and/or modify it under the terms
7 // of the GNU General Public License as published by the Free Software
8 // Foundation; either version 3, or (at your option) any later
11 // This library is distributed in the hope that it will be useful, but
12 // WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 // General Public License for more details.
16 // Under Section 7 of GPL version 3, you are granted additional
17 // permissions described in the GCC Runtime Library Exception, version
18 // 3.1, as published by the Free Software Foundation.
20 // You should have received a copy of the GNU General Public License and
21 // a copy of the GCC Runtime Library Exception along with this program;
22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23 // <http://www.gnu.org/licenses/>.
25 // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
27 // Permission to use, copy, modify, sell, and distribute this software
28 // is hereby granted without fee, provided that the above copyright
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37 * @file counter_lu_metadata.hpp
38 * Contains implementation of a lu counter policy's metadata.
45 template<typename Size_Type>
46 class counter_lu_policy_base;
48 // A list-update metadata type that moves elements to the front of
49 // the list based on the counter algorithm.
50 template<typename Size_Type = std::size_t>
51 class counter_lu_metadata
54 typedef Size_Type size_type;
57 counter_lu_metadata(size_type init_count) : m_count(init_count)
60 friend class counter_lu_policy_base<size_type>;
62 mutable size_type m_count;
65 template<typename Size_Type>
66 class counter_lu_policy_base
69 typedef Size_Type size_type;
71 counter_lu_metadata<size_type>
72 operator()(size_type max_size) const
73 { return counter_lu_metadata<Size_Type>(std::rand() % max_size); }
75 template<typename Metadata_Reference>
77 operator()(Metadata_Reference r_data, size_type m_max_count) const
79 if (++r_data.m_count != m_max_count)
86 } // namespace __gnu_pbds