1// -*- C++ -*- 2 3// Copyright (C) 2005-2013 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_policy.hpp 38 * Contains a sample resize policy for hash tables. 39 */ 40 41#ifndef PB_DS_SAMPLE_RESIZE_POLICY_HPP 42#define PB_DS_SAMPLE_RESIZE_POLICY_HPP 43 44namespace __gnu_pbds 45{ 46 /// A sample resize policy. 47 class sample_resize_policy 48 { 49 public: 50 /// Size type. 51 typedef std::size_t size_type; 52 53 /// Default constructor. 54 sample_resize_policy(); 55 56 /// Copy constructor. 57 sample_range_hashing(const sample_resize_policy& other); 58 59 /// Swaps content. 60 inline void 61 swap(sample_resize_policy& other); 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. 101 inline void 102 notify_inserted(size_type num_e); 103 104 /// Notifies an element was erased. 105 inline void 106 notify_erased(size_type num_e); 107 108 /// Notifies the table was cleared. 109 void 110 notify_cleared(); 111 112 /// Notifies the table was resized to new_size. 113 void 114 notify_resized(size_type new_size); 115 116 /// Queries whether a resize is needed. 117 inline bool 118 is_resize_needed() const; 119 120 /// Queries what the new size should be. 121 size_type 122 get_new_size(size_type size, size_type num_used_e) const; 123 }; 124} 125#endif 126