3 // Copyright (C) 2005, 2006, 2007, 2009, 2010, 2011
4 // Free Software Foundation, Inc.
6 // This file is part of the GNU ISO C++ Library. This library is free
7 // software; you can redistribute it and/or modify it under the terms
8 // of the GNU General Public License as published by the Free Software
9 // Foundation; either version 3, or (at your option) any later
12 // This library is distributed in the hope that it will be useful, but
13 // WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 // General Public License for more details.
17 // Under Section 7 of GPL version 3, you are granted additional
18 // permissions described in the GCC Runtime Library Exception, version
19 // 3.1, as published by the Free Software Foundation.
21 // You should have received a copy of the GNU General Public License and
22 // a copy of the GCC Runtime Library Exception along with this program;
23 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
24 // <http://www.gnu.org/licenses/>.
26 // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
28 // Permission to use, copy, modify, sell, and distribute this software
29 // is hereby granted without fee, provided that the above copyright
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38 * @file lu_counter_metadata.hpp
39 * Contains implementation of a lu counter policy's metadata.
46 template<typename Size_Type>
47 class lu_counter_policy_base;
49 /// A list-update metadata type that moves elements to the front of
50 /// the list based on the counter algorithm.
51 template<typename Size_Type = std::size_t>
52 class lu_counter_metadata
55 typedef Size_Type size_type;
58 lu_counter_metadata(size_type init_count) : m_count(init_count)
61 friend class lu_counter_policy_base<size_type>;
63 mutable size_type m_count;
66 /// Base class for list-update counter policy.
67 template<typename Size_Type>
68 class lu_counter_policy_base
71 typedef Size_Type size_type;
73 lu_counter_metadata<size_type>
74 operator()(size_type max_size) const
75 { return lu_counter_metadata<Size_Type>(std::rand() % max_size); }
77 template<typename Metadata_Reference>
79 operator()(Metadata_Reference r_data, size_type m_max_count) const
81 if (++r_data.m_count != m_max_count)
88 } // namespace __gnu_pbds