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 list_update_policy.hpp 44169691Skan * Contains policies for list update containers. 45169691Skan */ 46169691Skan 47169691Skan#ifndef PB_DS_LU_POLICY_HPP 48169691Skan#define PB_DS_LU_POLICY_HPP 49169691Skan 50169691Skan#include <ext/pb_ds/detail/list_update_policy/counter_lu_metadata.hpp> 51169691Skan 52169691Skannamespace pb_ds 53169691Skan{ 54169691Skan // A null type that means that each link in a list-based container 55169691Skan // does not actually need metadata. 56169691Skan struct null_lu_metadata 57169691Skan { }; 58169691Skan 59169691Skan#define PB_DS_CLASS_T_DEC template<typename Allocator> 60169691Skan#define PB_DS_CLASS_C_DEC move_to_front_lu_policy<Allocator> 61169691Skan 62169691Skan // A list-update policy that unconditionally moves elements to the 63169691Skan // front of the list. 64169691Skan template<typename Allocator = std::allocator<char> > 65169691Skan class move_to_front_lu_policy 66169691Skan { 67169691Skan public: 68169691Skan typedef Allocator allocator; 69169691Skan 70169691Skan // Metadata on which this functor operates. 71169691Skan typedef null_lu_metadata metadata_type; 72169691Skan 73169691Skan // Reference to metadata on which this functor operates. 74169691Skan typedef typename allocator::template rebind<metadata_type>::other metadata_rebind; 75169691Skan typedef typename metadata_rebind::reference metadata_reference; 76169691Skan 77169691Skan // Creates a metadata object. 78169691Skan metadata_type 79169691Skan operator()() const; 80169691Skan 81169691Skan // Decides whether a metadata object should be moved to the front 82169691Skan // of the list. 83169691Skan inline bool 84169691Skan operator()(metadata_reference r_metadata) const; 85169691Skan 86169691Skan private: 87169691Skan static null_lu_metadata s_metadata; 88169691Skan }; 89169691Skan 90169691Skan#include <ext/pb_ds/detail/list_update_policy/mtf_lu_policy_imp.hpp> 91169691Skan 92169691Skan#undef PB_DS_CLASS_T_DEC 93169691Skan#undef PB_DS_CLASS_C_DEC 94169691Skan 95169691Skan#define PB_DS_CLASS_T_DEC template<size_t Max_Count, class Allocator> 96169691Skan#define PB_DS_CLASS_C_DEC counter_lu_policy<Max_Count, Allocator> 97169691Skan 98169691Skan // A list-update policy that moves elements to the front of the list 99169691Skan // based on the counter algorithm. 100169691Skan template<size_t Max_Count = 5, typename Allocator = std::allocator<char> > 101169691Skan class counter_lu_policy 102169691Skan : private detail::counter_lu_policy_base<typename Allocator::size_type> 103169691Skan { 104169691Skan public: 105169691Skan typedef Allocator allocator; 106169691Skan 107169691Skan enum 108169691Skan { 109169691Skan max_count = Max_Count 110169691Skan }; 111169691Skan 112169691Skan typedef typename allocator::size_type size_type; 113169691Skan 114169691Skan // Metadata on which this functor operates. 115169691Skan typedef detail::counter_lu_metadata<size_type> metadata_type; 116169691Skan 117169691Skan // Reference to metadata on which this functor operates. 118169691Skan typedef typename Allocator::template rebind<metadata_type>::other metadata_rebind; 119169691Skan typedef typename metadata_rebind::reference metadata_reference; 120169691Skan 121169691Skan // Creates a metadata object. 122169691Skan metadata_type 123169691Skan operator()() const; 124169691Skan 125169691Skan // Decides whether a metadata object should be moved to the front 126169691Skan // of the list. 127169691Skan bool 128169691Skan operator()(metadata_reference r_metadata) const; 129169691Skan 130169691Skan private: 131169691Skan typedef detail::counter_lu_policy_base<typename Allocator::size_type> base_type; 132169691Skan }; 133169691Skan 134169691Skan#include <ext/pb_ds/detail/list_update_policy/counter_lu_policy_imp.hpp> 135169691Skan 136169691Skan#undef PB_DS_CLASS_T_DEC 137169691Skan#undef PB_DS_CLASS_C_DEC 138169691Skan 139169691Skan} // namespace pb_ds 140169691Skan 141169691Skan#endif 142