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 detail/standard_policies.hpp 38 * Contains standard policies for containers. 39 */ 40 41 #ifndef PB_DS_STANDARD_POLICIES_HPP 42 #define PB_DS_STANDARD_POLICIES_HPP 43 44 #include <memory> 45 #include <ext/pb_ds/hash_policy.hpp> 46 #include <ext/pb_ds/list_update_policy.hpp> 47 #include <ext/pb_ds/detail/branch_policy/null_node_metadata.hpp> 48 #include <ext/pb_ds/tree_policy.hpp> 49 #include <ext/pb_ds/trie_policy.hpp> 50 #include <ext/pb_ds/tag_and_trait.hpp> 51 #include <tr1/functional> 52 53 namespace __gnu_pbds 54 { 55 namespace detail 56 { 57 /// Primary template, default_hash_fn. 58 template<typename Key> 59 struct default_hash_fn 60 { 61 /// Dispatched type. 62 typedef std::tr1::hash<Key> type; 63 }; 64 65 /// Primary template, default_eq_fn. 66 template<typename Key> 67 struct default_eq_fn 68 { 69 /// Dispatched type. 70 typedef std::equal_to<Key> type; 71 }; 72 73 /// Enumeration for default behavior of stored hash data. 74 enum 75 { 76 default_store_hash = false 77 }; 78 79 /// Primary template, default_comb_hash_fn. 80 struct default_comb_hash_fn 81 { 82 /// Dispatched type. 83 typedef direct_mask_range_hashing<> type; 84 }; 85 86 /// Primary template, default_resize_policy. 87 template<typename Comb_Hash_Fn> 88 struct default_resize_policy 89 { 90 private: 91 typedef typename Comb_Hash_Fn::size_type size_type; 92 93 typedef direct_mask_range_hashing<size_type> default_fn; 94 typedef is_same<default_fn, Comb_Hash_Fn> same_type; 95 typedef hash_exponential_size_policy<size_type> iftrue; 96 typedef hash_prime_size_policy iffalse; 97 typedef __conditional_type<same_type::value, iftrue, iffalse> cond_type; 98 typedef typename cond_type::__type size_policy_type; 99 100 typedef hash_load_check_resize_trigger<false, size_type> trigger; 101 102 public: 103 /// Dispatched type. 104 typedef hash_standard_resize_policy<size_policy_type, trigger, 105 false, size_type> type; 106 }; 107 108 /// Default update policy. 109 struct default_update_policy 110 { 111 /// Dispatched type. 112 typedef lu_move_to_front_policy<> type; 113 }; 114 115 /// Primary template, default_probe_fn. 116 template<typename Comb_Probe_Fn> 117 struct default_probe_fn 118 { 119 private: 120 typedef typename Comb_Probe_Fn::size_type size_type; 121 typedef direct_mask_range_hashing<size_type> default_fn; 122 typedef is_same<default_fn, Comb_Probe_Fn> same_type; 123 typedef linear_probe_fn<size_type> iftrue; 124 typedef quadratic_probe_fn<size_type> iffalse; 125 typedef __conditional_type<same_type::value, iftrue, iffalse> cond_type; 126 127 public: 128 /// Dispatched type. 129 typedef typename cond_type::__type type; 130 }; 131 132 133 /// Primary template, default_trie_access_traits. 134 template<typename Key> 135 struct default_trie_access_traits; 136 137 #define __dtrie_alloc std::allocator<char> 138 #define __dtrie_string std::basic_string<Char, Char_Traits, __dtrie_alloc> 139 140 /// Partial specialization, default_trie_access_traits. 141 template<typename Char, typename Char_Traits> 142 struct default_trie_access_traits<__dtrie_string> 143 { 144 private: 145 typedef __dtrie_string string_type; 146 147 public: 148 /// Dispatched type. 149 typedef trie_string_access_traits<string_type> type; 150 }; 151 152 #undef __dtrie_alloc 153 #undef __dtrie_string 154 155 } // namespace detail 156 } // namespace __gnu_pbds 157 158 #endif // #ifndef PB_DS_STANDARD_POLICIES_HPP 159
