1 // -*- C++ -*- 2 3 // Copyright (C) 2005-2018 Free Software Foundation, Inc. 4 // 5 // This file is part of the GNU ISO C++ Library. This library is free 6 // software; you can redistribute it and/or modify it under the terms 7 // of the GNU General Public License as published by the Free Software 8 // Foundation; either version 3, or (at your option) any later 9 // version. 10 11 // This library is distributed in the hope that it will be useful, but 12 // WITHOUT ANY WARRANTY; without even the implied warranty of 13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 // General Public License for more details. 15 16 // Under Section 7 of GPL version 3, you are granted additional 17 // permissions described in the GCC Runtime Library Exception, version 18 // 3.1, as published by the Free Software Foundation. 19 20 // You should have received a copy of the GNU General Public License and 21 // a copy of the GCC Runtime Library Exception along with this program; 22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23 // <http://www.gnu.org/licenses/>. 24 25 // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL. 26 27 // Permission to use, copy, modify, sell, and distribute this software 28 // is hereby granted without fee, provided that the above copyright 29 // notice appears in all copies, and that both that copyright notice 30 // and this permission notice appear in supporting documentation. None 31 // of the above authors, nor IBM Haifa Research Laboratories, make any 32 // representation about the suitability of this software for any 33 // purpose. It is provided "as is" without express or implied 34 // warranty. 35 36 /** 37 * @file sample_resize_trigger.hpp 38 * Contains a sample resize trigger policy class. 39 */ 40 41 #ifndef PB_DS_SAMPLE_RESIZE_TRIGGER_HPP 42 #define PB_DS_SAMPLE_RESIZE_TRIGGER_HPP 43 44 namespace __gnu_pbds 45 { 46 /// A sample resize trigger policy. 47 class sample_resize_trigger 48 { 49 public: 50 /// Size type. 51 typedef std::size_t size_type; 52 53 /// Default constructor. 54 sample_resize_trigger(); 55 56 /// Copy constructor. 57 sample_range_hashing(const sample_resize_trigger&); 58 59 /// Swaps content. 60 inline void 61 swap(sample_resize_trigger&); 62 63 protected: 64 /// Notifies a search started. 65 inline void 66 notify_insert_search_start(); 67 68 /// Notifies a search encountered a collision. 69 inline void 70 notify_insert_search_collision(); 71 72 /// Notifies a search ended. 73 inline void 74 notify_insert_search_end(); 75 76 /// Notifies a search started. 77 inline void 78 notify_find_search_start(); 79 80 /// Notifies a search encountered a collision. 81 inline void 82 notify_find_search_collision(); 83 84 /// Notifies a search ended. 85 inline void 86 notify_find_search_end(); 87 88 /// Notifies a search started. 89 inline void 90 notify_erase_search_start(); 91 92 /// Notifies a search encountered a collision. 93 inline void 94 notify_erase_search_collision(); 95 96 /// Notifies a search ended. 97 inline void 98 notify_erase_search_end(); 99 100 /// Notifies an element was inserted. the total number of entries in 101 /// the table is num_entries. 102 inline void 103 notify_inserted(size_type num_entries); 104 105 /// Notifies an element was erased. 106 inline void 107 notify_erased(size_type num_entries); 108 109 /// Notifies the table was cleared. 110 void 111 notify_cleared(); 112 113 /// Notifies the table was resized as a result of this object's 114 /// signifying that a resize is needed. 115 void 116 notify_resized(size_type new_size); 117 118 /// Notifies the table was resized externally. 119 void 120 notify_externally_resized(size_type new_size); 121 122 /// Queries whether a resize is needed. 123 inline bool 124 is_resize_needed() const; 125 126 /// Queries whether a grow is needed. 127 inline bool 128 is_grow_needed(size_type size, size_type num_entries) const; 129 130 private: 131 /// Resizes to new_size. 132 virtual void 133 do_resize(size_type); 134 }; 135 } 136 #endif 137