libstdc++
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00001 // -*- C++ -*- 00002 00003 // Copyright (C) 2005, 2006, 2009 Free Software Foundation, Inc. 00004 // 00005 // This file is part of the GNU ISO C++ Library. This library is free 00006 // software; you can redistribute it and/or modify it under the terms 00007 // of the GNU General Public License as published by the Free Software 00008 // Foundation; either version 3, or (at your option) any later 00009 // version. 00010 00011 // This library is distributed in the hope that it will be useful, but 00012 // WITHOUT ANY WARRANTY; without even the implied warranty of 00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00014 // General Public License for more details. 00015 00016 // Under Section 7 of GPL version 3, you are granted additional 00017 // permissions described in the GCC Runtime Library Exception, version 00018 // 3.1, as published by the Free Software Foundation. 00019 00020 // You should have received a copy of the GNU General Public License and 00021 // a copy of the GCC Runtime Library Exception along with this program; 00022 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 00023 // <http://www.gnu.org/licenses/>. 00024 00025 // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL. 00026 00027 // Permission to use, copy, modify, sell, and distribute this software 00028 // is hereby granted without fee, provided that the above copyright 00029 // notice appears in all copies, and that both that copyright notice 00030 // and this permission notice appear in supporting documentation. None 00031 // of the above authors, nor IBM Haifa Research Laboratories, make any 00032 // representation about the suitability of this software for any 00033 // purpose. It is provided "as is" without express or implied 00034 // warranty. 00035 00036 /** 00037 * @file sample_update_policy.hpp 00038 * Contains a sample policy for list update containers. 00039 */ 00040 00041 #ifndef PB_DS_SAMPLE_UPDATE_POLICY_HPP 00042 #define PB_DS_SAMPLE_UPDATE_POLICY_HPP 00043 00044 namespace __gnu_pbds 00045 { 00046 /// A sample list-update policy. 00047 struct sample_update_policy 00048 { 00049 /// Default constructor. 00050 sample_update_policy(); 00051 00052 /// Copy constructor. 00053 sample_update_policy(const sample_update_policy&); 00054 00055 /// Swaps content. 00056 inline void 00057 swap(sample_update_policy& other); 00058 00059 protected: 00060 /// Metadata on which this functor operates. 00061 typedef some_metadata_type metadata_type; 00062 00063 /// Creates a metadata object. 00064 metadata_type 00065 operator()() const; 00066 00067 /// Decides whether a metadata object should be moved to the front 00068 /// of the list. A list-update based containers object will call 00069 /// this method to decide whether to move a node to the front of 00070 /// the list. The method shoule return true if the node should be 00071 /// moved to the front of the list. 00072 bool 00073 operator()(metadata_reference) const; 00074 }; 00075 } 00076 #endif