libstdc++
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00001 // -*- C++ -*- 00002 00003 // Copyright (C) 2005, 2006, 2009, 2010 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_resize_policy.hpp 00038 * Contains a sample resize policy for hash tables. 00039 */ 00040 00041 #ifndef PB_DS_SAMPLE_RESIZE_POLICY_HPP 00042 #define PB_DS_SAMPLE_RESIZE_POLICY_HPP 00043 00044 namespace __gnu_pbds 00045 { 00046 /// A sample resize policy. 00047 class sample_resize_policy 00048 { 00049 public: 00050 /// Size type. 00051 typedef std::size_t size_type; 00052 00053 /// Default constructor. 00054 sample_resize_policy(); 00055 00056 /// Copy constructor. 00057 sample_range_hashing(const sample_resize_policy& other); 00058 00059 /// Swaps content. 00060 inline void 00061 swap(sample_resize_policy& other); 00062 00063 protected: 00064 /// Notifies a search started. 00065 inline void 00066 notify_insert_search_start(); 00067 00068 /// Notifies a search encountered a collision. 00069 inline void 00070 notify_insert_search_collision(); 00071 00072 /// Notifies a search ended. 00073 inline void 00074 notify_insert_search_end(); 00075 00076 /// Notifies a search started. 00077 inline void 00078 notify_find_search_start(); 00079 00080 /// Notifies a search encountered a collision. 00081 inline void 00082 notify_find_search_collision(); 00083 00084 /// Notifies a search ended. 00085 inline void 00086 notify_find_search_end(); 00087 00088 /// Notifies a search started. 00089 inline void 00090 notify_erase_search_start(); 00091 00092 /// Notifies a search encountered a collision. 00093 inline void 00094 notify_erase_search_collision(); 00095 00096 /// Notifies a search ended. 00097 inline void 00098 notify_erase_search_end(); 00099 00100 /// Notifies an element was inserted. 00101 inline void 00102 notify_inserted(size_type num_e); 00103 00104 /// Notifies an element was erased. 00105 inline void 00106 notify_erased(size_type num_e); 00107 00108 /// Notifies the table was cleared. 00109 void 00110 notify_cleared(); 00111 00112 /// Notifies the table was resized to new_size. 00113 void 00114 notify_resized(size_type new_size); 00115 00116 /// Queries whether a resize is needed. 00117 inline bool 00118 is_resize_needed() const; 00119 00120 /// Queries what the new size should be. 00121 size_type 00122 get_new_size(size_type size, size_type num_used_e) const; 00123 }; 00124 } 00125 #endif