libstdc++
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00001 // -*- C++ -*- 00002 00003 // Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010 00004 // Free Software Foundation, Inc. 00005 // 00006 // This file is part of the GNU ISO C++ Library. This library is free 00007 // software; you can redistribute it and/or modify it under the terms 00008 // of the GNU General Public License as published by the Free Software 00009 // Foundation; either version 3, or (at your option) any later 00010 // version. 00011 00012 // This library is distributed in the hope that it will be useful, but 00013 // WITHOUT ANY WARRANTY; without even the implied warranty of 00014 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00015 // General Public License for more details. 00016 00017 // Under Section 7 of GPL version 3, you are granted additional 00018 // permissions described in the GCC Runtime Library Exception, version 00019 // 3.1, as published by the Free Software Foundation. 00020 00021 // You should have received a copy of the GNU General Public License and 00022 // a copy of the GCC Runtime Library Exception along with this program; 00023 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 00024 // <http://www.gnu.org/licenses/>. 00025 00026 // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL. 00027 00028 // Permission to use, copy, modify, sell, and distribute this software 00029 // is hereby granted without fee, provided that the above copyright 00030 // notice appears in all copies, and that both that copyright notice 00031 // and this permission notice appear in supporting documentation. None 00032 // of the above authors, nor IBM Haifa Research Laboratories, make any 00033 // representation about the suitability of this software for any 00034 // purpose. It is provided "as is" without express or implied 00035 // warranty. 00036 00037 /** 00038 * @file sample_resize_trigger.hpp 00039 * Contains a sample resize trigger policy class. 00040 */ 00041 00042 #ifndef PB_DS_SAMPLE_RESIZE_TRIGGER_HPP 00043 #define PB_DS_SAMPLE_RESIZE_TRIGGER_HPP 00044 00045 namespace __gnu_pbds 00046 { 00047 /// A sample resize trigger policy. 00048 class sample_resize_trigger 00049 { 00050 public: 00051 /// Size type. 00052 typedef std::size_t size_type; 00053 00054 /// Default constructor. 00055 sample_resize_trigger(); 00056 00057 /// Copy constructor. 00058 sample_range_hashing(const sample_resize_trigger&); 00059 00060 /// Swaps content. 00061 inline void 00062 swap(sample_resize_trigger&); 00063 00064 protected: 00065 /// Notifies a search started. 00066 inline void 00067 notify_insert_search_start(); 00068 00069 /// Notifies a search encountered a collision. 00070 inline void 00071 notify_insert_search_collision(); 00072 00073 /// Notifies a search ended. 00074 inline void 00075 notify_insert_search_end(); 00076 00077 /// Notifies a search started. 00078 inline void 00079 notify_find_search_start(); 00080 00081 /// Notifies a search encountered a collision. 00082 inline void 00083 notify_find_search_collision(); 00084 00085 /// Notifies a search ended. 00086 inline void 00087 notify_find_search_end(); 00088 00089 /// Notifies a search started. 00090 inline void 00091 notify_erase_search_start(); 00092 00093 /// Notifies a search encountered a collision. 00094 inline void 00095 notify_erase_search_collision(); 00096 00097 /// Notifies a search ended. 00098 inline void 00099 notify_erase_search_end(); 00100 00101 /// Notifies an element was inserted. the total number of entries in 00102 /// the table is num_entries. 00103 inline void 00104 notify_inserted(size_type num_entries); 00105 00106 /// Notifies an element was erased. 00107 inline void 00108 notify_erased(size_type num_entries); 00109 00110 /// Notifies the table was cleared. 00111 void 00112 notify_cleared(); 00113 00114 /// Notifies the table was resized as a result of this object's 00115 /// signifying that a resize is needed. 00116 void 00117 notify_resized(size_type new_size); 00118 00119 /// Notifies the table was resized externally. 00120 void 00121 notify_externally_resized(size_type new_size); 00122 00123 /// Queries whether a resize is needed. 00124 inline bool 00125 is_resize_needed() const; 00126 00127 /// Queries whether a grow is needed. 00128 inline bool 00129 is_grow_needed(size_type size, size_type num_entries) const; 00130 00131 private: 00132 /// Resizes to new_size. 00133 virtual void 00134 do_resize(size_type); 00135 }; 00136 } 00137 #endif