libstdc++

standard_policies.hpp
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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