1 // -*- C++ -*- 2 3 // Copyright (C) 2005, 2006, 2007, 2009 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 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/tree_policy.hpp> 48 #include <ext/pb_ds/detail/basic_tree_policy/null_node_metadata.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 template<typename Key> 58 struct default_hash_fn 59 { 60 typedef std::tr1::hash<Key> type; 61 }; 62 63 template<typename Key> 64 struct default_eq_fn 65 { 66 typedef std::equal_to<Key> type; 67 }; 68 69 enum 70 { 71 default_store_hash = false 72 }; 73 74 struct default_comb_hash_fn 75 { 76 typedef __gnu_pbds::direct_mask_range_hashing<> type; 77 }; 78 79 template<typename Comb_Hash_Fn> 80 struct default_resize_policy 81 { 82 private: 83 typedef typename Comb_Hash_Fn::size_type size_type; 84 85 typedef __gnu_pbds::direct_mask_range_hashing<size_type> default_fn; 86 typedef is_same<default_fn, Comb_Hash_Fn> same_type; 87 typedef __gnu_pbds::hash_exponential_size_policy<size_type> iftrue; 88 typedef __gnu_pbds::hash_prime_size_policy iffalse; 89 typedef __conditional_type<same_type::value, iftrue, iffalse> cond_type; 90 typedef typename cond_type::__type size_policy_type; 91 92 typedef __gnu_pbds::hash_load_check_resize_trigger<false, size_type> trigger; 93 94 public: 95 typedef __gnu_pbds::hash_standard_resize_policy<size_policy_type, trigger, false, size_type> type; 96 }; 97 98 struct default_update_policy 99 { 100 typedef __gnu_pbds::move_to_front_lu_policy<> type; 101 }; 102 103 template<typename Comb_Probe_Fn> 104 struct default_probe_fn 105 { 106 private: 107 typedef typename Comb_Probe_Fn::size_type size_type; 108 109 typedef __gnu_pbds::direct_mask_range_hashing<size_type> default_fn; 110 typedef is_same<default_fn, Comb_Probe_Fn> same_type; 111 typedef __gnu_pbds::linear_probe_fn<size_type> iftrue; 112 typedef __gnu_pbds::quadratic_probe_fn<size_type> iffalse; 113 typedef __conditional_type<same_type::value, iftrue, iffalse> cond_type; 114 115 public: 116 typedef typename cond_type::__type type; 117 }; 118 119 template<typename Key> 120 struct default_trie_e_access_traits; 121 122 template<typename Char, class Char_Traits> 123 struct default_trie_e_access_traits<std::basic_string<Char, Char_Traits, std::allocator<char> > > 124 { 125 private: 126 typedef std::basic_string<Char, Char_Traits, std::allocator<char> > string_type; 127 128 public: 129 typedef __gnu_pbds::string_trie_e_access_traits<string_type> type; 130 }; 131 132 } // namespace detail 133 } // namespace __gnu_pbds 134 135 #endif // #ifndef PB_DS_STANDARD_POLICIES_HPP 136 137
