libstdc++
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00001 // -*- C++ -*- 00002 00003 // Copyright (C) 2005, 2006, 2007, 2009 Free Software Foundation, Inc. 00004 // 00005 // This file is part of the GNU ISO C++ Library. This library is free 00006 // software; you can redistribute it and/or modify it under the terms 00007 // of the GNU General Public License as published by the Free Software 00008 // Foundation; either version 3, or (at your option) any later 00009 // version. 00010 00011 // This library is distributed in the hope that it will be useful, but 00012 // WITHOUT ANY WARRANTY; without even the implied warranty of 00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00014 // General Public License for more details. 00015 00016 // Under Section 7 of GPL version 3, you are granted additional 00017 // permissions described in the GCC Runtime Library Exception, version 00018 // 3.1, as published by the Free Software Foundation. 00019 00020 // You should have received a copy of the GNU General Public License and 00021 // a copy of the GCC Runtime Library Exception along with this program; 00022 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 00023 // <http://www.gnu.org/licenses/>. 00024 00025 // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL. 00026 00027 // Permission to use, copy, modify, sell, and distribute this software 00028 // is hereby granted without fee, provided that the above copyright 00029 // notice appears in all copies, and that both that copyright notice 00030 // and this permission notice appear in supporting documentation. None 00031 // of the above authors, nor IBM Haifa Research Laboratories, make any 00032 // representation about the suitability of this software for any 00033 // purpose. It is provided "as is" without express or implied 00034 // warranty. 00035 00036 /** 00037 * @file standard_policies.hpp 00038 * Contains standard policies for containers. 00039 */ 00040 00041 #ifndef PB_DS_STANDARD_POLICIES_HPP 00042 #define PB_DS_STANDARD_POLICIES_HPP 00043 00044 #include <memory> 00045 #include <ext/pb_ds/hash_policy.hpp> 00046 #include <ext/pb_ds/list_update_policy.hpp> 00047 #include <ext/pb_ds/tree_policy.hpp> 00048 #include <ext/pb_ds/detail/basic_tree_policy/null_node_metadata.hpp> 00049 #include <ext/pb_ds/trie_policy.hpp> 00050 #include <ext/pb_ds/tag_and_trait.hpp> 00051 #include <tr1/functional> 00052 00053 namespace __gnu_pbds 00054 { 00055 namespace detail 00056 { 00057 template<typename Key> 00058 struct default_hash_fn 00059 { 00060 typedef std::tr1::hash<Key> type; 00061 }; 00062 00063 template<typename Key> 00064 struct default_eq_fn 00065 { 00066 typedef std::equal_to<Key> type; 00067 }; 00068 00069 enum 00070 { 00071 default_store_hash = false 00072 }; 00073 00074 struct default_comb_hash_fn 00075 { 00076 typedef __gnu_pbds::direct_mask_range_hashing<> type; 00077 }; 00078 00079 template<typename Comb_Hash_Fn> 00080 struct default_resize_policy 00081 { 00082 private: 00083 typedef typename Comb_Hash_Fn::size_type size_type; 00084 00085 typedef __gnu_pbds::direct_mask_range_hashing<size_type> default_fn; 00086 typedef is_same<default_fn, Comb_Hash_Fn> same_type; 00087 typedef __gnu_pbds::hash_exponential_size_policy<size_type> iftrue; 00088 typedef __gnu_pbds::hash_prime_size_policy iffalse; 00089 typedef __conditional_type<same_type::value, iftrue, iffalse> cond_type; 00090 typedef typename cond_type::__type size_policy_type; 00091 00092 typedef __gnu_pbds::hash_load_check_resize_trigger<false, size_type> trigger; 00093 00094 public: 00095 typedef __gnu_pbds::hash_standard_resize_policy<size_policy_type, trigger, false, size_type> type; 00096 }; 00097 00098 struct default_update_policy 00099 { 00100 typedef __gnu_pbds::move_to_front_lu_policy<> type; 00101 }; 00102 00103 template<typename Comb_Probe_Fn> 00104 struct default_probe_fn 00105 { 00106 private: 00107 typedef typename Comb_Probe_Fn::size_type size_type; 00108 00109 typedef __gnu_pbds::direct_mask_range_hashing<size_type> default_fn; 00110 typedef is_same<default_fn, Comb_Probe_Fn> same_type; 00111 typedef __gnu_pbds::linear_probe_fn<size_type> iftrue; 00112 typedef __gnu_pbds::quadratic_probe_fn<size_type> iffalse; 00113 typedef __conditional_type<same_type::value, iftrue, iffalse> cond_type; 00114 00115 public: 00116 typedef typename cond_type::__type type; 00117 }; 00118 00119 template<typename Key> 00120 struct default_trie_e_access_traits; 00121 00122 template<typename Char, class Char_Traits> 00123 struct default_trie_e_access_traits<std::basic_string<Char, Char_Traits, std::allocator<char> > > 00124 { 00125 private: 00126 typedef std::basic_string<Char, Char_Traits, std::allocator<char> > string_type; 00127 00128 public: 00129 typedef __gnu_pbds::string_trie_e_access_traits<string_type> type; 00130 }; 00131 00132 } // namespace detail 00133 } // namespace __gnu_pbds 00134 00135 #endif // #ifndef PB_DS_STANDARD_POLICIES_HPP 00136