1 // -*- C++ -*- 2 3 // Copyright (C) 2005, 2006 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 2, 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 // You should have received a copy of the GNU General Public License 17 // along with this library; see the file COPYING. If not, write to 18 // the Free Software Foundation, 59 Temple Place - Suite 330, Boston, 19 // MA 02111-1307, USA. 20 21 // As a special exception, you may use this file as part of a free 22 // software library without restriction. Specifically, if other files 23 // instantiate templates or use macros or inline functions from this 24 // file, or you compile this file and link it with other files to 25 // produce an executable, this file does not by itself cause the 26 // resulting executable to be covered by the GNU General Public 27 // License. This exception does not however invalidate any other 28 // reasons why the executable file might be covered by the GNU General 29 // Public License. 30 31 // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL. 32 33 // Permission to use, copy, modify, sell, and distribute this software 34 // is hereby granted without fee, provided that the above copyright 35 // notice appears in all copies, and that both that copyright notice 36 // and this permission notice appear in supporting documentation. None 37 // of the above authors, nor IBM Haifa Research Laboratories, make any 38 // representation about the suitability of this software for any 39 // purpose. It is provided "as is" without express or implied 40 // warranty. 41 42 /** 43 * @file standard_policies.hpp 44 * Contains standard policies for containers. 45 */ 46 47 #ifndef PB_DS_STANDARD_POLICIES_HPP 48 #define PB_DS_STANDARD_POLICIES_HPP 49 50 #include <memory> 51 #include <ext/pb_ds/hash_policy.hpp> 52 #include <ext/pb_ds/list_update_policy.hpp> 53 #include <ext/pb_ds/tree_policy.hpp> 54 #include <ext/pb_ds/detail/basic_tree_policy/null_node_metadata.hpp> 55 #include <ext/pb_ds/trie_policy.hpp> 56 #include <ext/pb_ds/tag_and_trait.hpp> 57 #include <ext/hash_map> 58 59 namespace pb_ds 60 { 61 namespace detail 62 { 63 template<typename Key> 64 struct default_hash_fn 65 { 66 typedef __gnu_cxx::hash< Key> type; 67 }; 68 69 template<typename Key> 70 struct default_eq_fn 71 { 72 typedef std::equal_to< Key> type; 73 }; 74 75 enum 76 { 77 default_store_hash = false 78 }; 79 80 struct default_comb_hash_fn 81 { 82 typedef pb_ds::direct_mask_range_hashing<> type; 83 }; 84 85 template<typename Comb_Hash_Fn> 86 struct default_resize_policy 87 { 88 private: 89 typedef typename Comb_Hash_Fn::size_type size_type; 90 91 typedef 92 typename __conditional_type< 93 is_same< 94 pb_ds::direct_mask_range_hashing< 95 size_type>, 96 Comb_Hash_Fn>::value, 97 pb_ds::hash_exponential_size_policy< 98 size_type>, 99 pb_ds::hash_prime_size_policy>::__type 100 size_policy_type; 101 102 public: 103 typedef 104 pb_ds::hash_standard_resize_policy< 105 size_policy_type, 106 pb_ds::hash_load_check_resize_trigger< 107 false, 108 size_type>, 109 false, 110 size_type> 111 type; 112 }; 113 114 struct default_update_policy 115 { 116 typedef pb_ds::move_to_front_lu_policy<> type; 117 }; 118 119 template<typename Comb_Probe_Fn> 120 struct default_probe_fn 121 { 122 private: 123 typedef typename Comb_Probe_Fn::size_type size_type; 124 125 public: 126 typedef 127 typename __conditional_type< 128 is_same< 129 pb_ds::direct_mask_range_hashing<size_t>, 130 Comb_Probe_Fn>::value, 131 pb_ds::linear_probe_fn< 132 size_type>, 133 pb_ds::quadratic_probe_fn< 134 size_type> >::__type 135 type; 136 }; 137 138 template<typename Key> 139 struct default_trie_e_access_traits; 140 141 template<typename Char, class Char_Traits> 142 struct default_trie_e_access_traits< 143 std::basic_string< 144 Char, 145 Char_Traits, 146 std::allocator< 147 char> > > 148 { 149 typedef 150 pb_ds::string_trie_e_access_traits< 151 std::basic_string< 152 Char, 153 Char_Traits, 154 std::allocator< 155 char> > > 156 type; 157 }; 158 159 } // namespace detail 160 } // namespace pb_ds 161 162 #endif // #ifndef PB_DS_STANDARD_POLICIES_HPP 163 164