1 // -*- C++ -*- 2 3 // Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010 4 // Free Software Foundation, Inc. 5 // 6 // This file is part of the GNU ISO C++ Library. This library is free 7 // software; you can redistribute it and/or modify it under the terms 8 // of the GNU General Public License as published by the Free Software 9 // Foundation; either version 3, or (at your option) any later 10 // version. 11 12 // This library is distributed in the hope that it will be useful, but 13 // WITHOUT ANY WARRANTY; without even the implied warranty of 14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 // General Public License for more details. 16 17 // Under Section 7 of GPL version 3, you are granted additional 18 // permissions described in the GCC Runtime Library Exception, version 19 // 3.1, as published by the Free Software Foundation. 20 21 // You should have received a copy of the GNU General Public License and 22 // a copy of the GCC Runtime Library Exception along with this program; 23 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 24 // <http://www.gnu.org/licenses/>. 25 26 // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL. 27 28 // Permission to use, copy, modify, sell, and distribute this software 29 // is hereby granted without fee, provided that the above copyright 30 // notice appears in all copies, and that both that copyright notice 31 // and this permission notice appear in supporting documentation. None 32 // of the above authors, nor IBM Haifa Research Laboratories, make any 33 // representation about the suitability of this software for any 34 // purpose. It is provided "as is" without express or implied 35 // warranty. 36 37 /** 38 * @file sample_resize_trigger.hpp 39 * Contains a sample resize trigger policy class. 40 */ 41 42 #ifndef PB_DS_SAMPLE_RESIZE_TRIGGER_HPP 43 #define PB_DS_SAMPLE_RESIZE_TRIGGER_HPP 44 45 namespace __gnu_pbds 46 { 47 /// A sample resize trigger policy. 48 class sample_resize_trigger 49 { 50 public: 51 /// Size type. 52 typedef std::size_t size_type; 53 54 /// Default constructor. 55 sample_resize_trigger(); 56 57 /// Copy constructor. 58 sample_range_hashing(const sample_resize_trigger&); 59 60 /// Swaps content. 61 inline void 62 swap(sample_resize_trigger&); 63 64 protected: 65 /// Notifies a search started. 66 inline void 67 notify_insert_search_start(); 68 69 /// Notifies a search encountered a collision. 70 inline void 71 notify_insert_search_collision(); 72 73 /// Notifies a search ended. 74 inline void 75 notify_insert_search_end(); 76 77 /// Notifies a search started. 78 inline void 79 notify_find_search_start(); 80 81 /// Notifies a search encountered a collision. 82 inline void 83 notify_find_search_collision(); 84 85 /// Notifies a search ended. 86 inline void 87 notify_find_search_end(); 88 89 /// Notifies a search started. 90 inline void 91 notify_erase_search_start(); 92 93 /// Notifies a search encountered a collision. 94 inline void 95 notify_erase_search_collision(); 96 97 /// Notifies a search ended. 98 inline void 99 notify_erase_search_end(); 100 101 /// Notifies an element was inserted. the total number of entries in 102 /// the table is num_entries. 103 inline void 104 notify_inserted(size_type num_entries); 105 106 /// Notifies an element was erased. 107 inline void 108 notify_erased(size_type num_entries); 109 110 /// Notifies the table was cleared. 111 void 112 notify_cleared(); 113 114 /// Notifies the table was resized as a result of this object's 115 /// signifying that a resize is needed. 116 void 117 notify_resized(size_type new_size); 118 119 /// Notifies the table was resized externally. 120 void 121 notify_externally_resized(size_type new_size); 122 123 /// Queries whether a resize is needed. 124 inline bool 125 is_resize_needed() const; 126 127 /// Queries whether a grow is needed. 128 inline bool 129 is_grow_needed(size_type size, size_type num_entries) const; 130 131 private: 132 /// Resizes to new_size. 133 virtual void 134 do_resize(size_type); 135 }; 136 } 137 #endif 138
