1169691Skan// -*- C++ -*- 2169691Skan 3169691Skan// Copyright (C) 2005, 2006 Free Software Foundation, Inc. 4169691Skan// 5169691Skan// This file is part of the GNU ISO C++ Library. This library is free 6169691Skan// software; you can redistribute it and/or modify it under the terms 7169691Skan// of the GNU General Public License as published by the Free Software 8169691Skan// Foundation; either version 2, or (at your option) any later 9169691Skan// version. 10169691Skan 11169691Skan// This library is distributed in the hope that it will be useful, but 12169691Skan// WITHOUT ANY WARRANTY; without even the implied warranty of 13169691Skan// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14169691Skan// General Public License for more details. 15169691Skan 16169691Skan// You should have received a copy of the GNU General Public License 17169691Skan// along with this library; see the file COPYING. If not, write to 18169691Skan// the Free Software Foundation, 59 Temple Place - Suite 330, Boston, 19169691Skan// MA 02111-1307, USA. 20169691Skan 21169691Skan// As a special exception, you may use this file as part of a free 22169691Skan// software library without restriction. Specifically, if other files 23169691Skan// instantiate templates or use macros or inline functions from this 24169691Skan// file, or you compile this file and link it with other files to 25169691Skan// produce an executable, this file does not by itself cause the 26169691Skan// resulting executable to be covered by the GNU General Public 27169691Skan// License. This exception does not however invalidate any other 28169691Skan// reasons why the executable file might be covered by the GNU General 29169691Skan// Public License. 30169691Skan 31169691Skan// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL. 32169691Skan 33169691Skan// Permission to use, copy, modify, sell, and distribute this software 34169691Skan// is hereby granted without fee, provided that the above copyright 35169691Skan// notice appears in all copies, and that both that copyright notice 36169691Skan// and this permission notice appear in supporting documentation. None 37169691Skan// of the above authors, nor IBM Haifa Research Laboratories, make any 38169691Skan// representation about the suitability of this software for any 39169691Skan// purpose. It is provided "as is" without express or implied 40169691Skan// warranty. 41169691Skan 42169691Skan/** 43169691Skan * @file counter_lu_metadata.hpp 44169691Skan * Contains implementation of a lu counter policy's metadata. 45169691Skan */ 46169691Skan 47169691Skannamespace pb_ds 48169691Skan{ 49169691Skan namespace detail 50169691Skan { 51169691Skan template<typename Size_Type> 52169691Skan class counter_lu_policy_base; 53169691Skan 54169691Skan // A list-update metadata type that moves elements to the front of 55169691Skan // the list based on the counter algorithm. 56169691Skan template<typename Size_Type = size_t> 57169691Skan class counter_lu_metadata 58169691Skan { 59169691Skan public: 60169691Skan typedef Size_Type size_type; 61169691Skan 62169691Skan private: 63169691Skan counter_lu_metadata(size_type init_count) : m_count(init_count) 64169691Skan { } 65169691Skan 66169691Skan friend class counter_lu_policy_base<size_type>; 67169691Skan 68169691Skan mutable size_type m_count; 69169691Skan }; 70169691Skan 71169691Skan template<typename Size_Type> 72169691Skan class counter_lu_policy_base 73169691Skan { 74169691Skan protected: 75169691Skan typedef Size_Type size_type; 76169691Skan 77169691Skan counter_lu_metadata<size_type> 78169691Skan operator()(size_type max_size) const 79169691Skan { return counter_lu_metadata<Size_Type>(rand() % max_size); } 80169691Skan 81169691Skan template<typename Metadata_Reference> 82169691Skan bool 83169691Skan operator()(Metadata_Reference r_data, size_type m_max_count) const 84169691Skan { 85169691Skan if (++r_data.m_count != m_max_count) 86169691Skan return false; 87169691Skan r_data.m_count = 0; 88169691Skan return true; 89169691Skan } 90169691Skan }; 91169691Skan } // namespace detail 92169691Skan} // namespace pb_ds 93