libstdc++
synth_access_traits.hpp
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1// -*- C++ -*-
2
3// Copyright (C) 2005-2022 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.
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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.
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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.
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27// Permission to use, copy, modify, sell, and distribute this software
28// is hereby granted without fee, provided that the above copyright
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30// and this permission notice appear in supporting documentation. None
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34// warranty.
35
36/**
37 * @file pat_trie_/synth_access_traits.hpp
38 * Contains an implementation class for a patricia tree.
39 */
40
41#ifndef PB_DS_SYNTH_E_ACCESS_TRAITS_HPP
42#define PB_DS_SYNTH_E_ACCESS_TRAITS_HPP
43
45
46namespace __gnu_pbds
47{
48 namespace detail
49 {
50
51#define PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC \
52 template<typename Type_Traits, bool Set, typename _ATraits>
53
54#define PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC \
55 synth_access_traits<Type_Traits, Set, _ATraits>
56
57 /// Synthetic element access traits.
58 template<typename Type_Traits, bool Set, typename _ATraits>
59 struct synth_access_traits : public _ATraits
60 {
61 typedef _ATraits base_type;
62 typedef typename base_type::const_iterator const_iterator;
63 typedef Type_Traits type_traits;
64 typedef typename type_traits::const_reference const_reference;
65 typedef typename type_traits::key_const_reference key_const_reference;
66
68
69 synth_access_traits(const base_type&);
70
71 inline bool
72 equal_prefixes(const_iterator, const_iterator, const_iterator,
73 const_iterator, bool compare_after = true) const;
74
75 bool
76 equal_keys(key_const_reference, key_const_reference) const;
77
78 bool
79 cmp_prefixes(const_iterator, const_iterator, const_iterator,
80 const_iterator, bool compare_after = false) const;
81
82 bool
83 cmp_keys(key_const_reference, key_const_reference) const;
84
85 inline static key_const_reference
86 extract_key(const_reference);
87
88#ifdef _GLIBCXX_DEBUG
89 bool
90 operator()(key_const_reference, key_const_reference);
91#endif
92
93 private:
94 inline static key_const_reference
95 extract_key(const_reference, true_type);
96
97 inline static key_const_reference
98 extract_key(const_reference, false_type);
99
100 static integral_constant<int, Set> s_set_ind;
101 };
102
103 PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC
104 integral_constant<int,Set>
105 PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::s_set_ind;
106
107 PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC
108 PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::
109 synth_access_traits()
110 { }
111
112 PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC
113 PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::
114 synth_access_traits(const _ATraits& r_traits)
115 : _ATraits(r_traits)
116 { }
117
118 PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC
119 inline bool
120 PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::
121 equal_prefixes(const_iterator b_l, const_iterator e_l, const_iterator b_r,
122 const_iterator e_r, bool compare_after /*= false */) const
123 {
124 while (b_l != e_l)
125 {
126 if (b_r == e_r)
127 return false;
128 if (base_type::e_pos(*b_l) != base_type::e_pos(*b_r))
129 return false;
130 ++b_l;
131 ++b_r;
132 }
133 return (!compare_after || b_r == e_r);
134 }
135
136 PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC
137 bool
138 PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::
139 equal_keys(key_const_reference r_lhs_key,
140 key_const_reference r_rhs_key) const
141 {
142 return equal_prefixes(base_type::begin(r_lhs_key),
143 base_type::end(r_lhs_key),
144 base_type::begin(r_rhs_key),
145 base_type::end(r_rhs_key),
146 true);
147 }
148
149 PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC
150 bool
151 PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::
152 cmp_prefixes(const_iterator b_l, const_iterator e_l, const_iterator b_r,
153 const_iterator e_r, bool compare_after /* = false*/) const
154 {
155 while (b_l != e_l)
156 {
157 if (b_r == e_r)
158 return false;
159
160 const typename base_type::size_type l_pos = base_type::e_pos(*b_l);
161 const typename base_type::size_type r_pos = base_type::e_pos(*b_r);
162 if (l_pos != r_pos)
163 return l_pos < r_pos;
164 ++b_l;
165 ++b_r;
166 }
167
168 if (!compare_after)
169 return false;
170 return b_r != e_r;
171 }
172
173 PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC
174 bool
175 PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::
176 cmp_keys(key_const_reference r_lhs_key,
177 key_const_reference r_rhs_key) const
178 {
179 return cmp_prefixes(base_type::begin(r_lhs_key),
180 base_type::end(r_lhs_key),
181 base_type::begin(r_rhs_key),
182 base_type::end(r_rhs_key),
183 true);
184 }
185
186 PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC
187 inline typename PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::key_const_reference
188 PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::
189 extract_key(const_reference r_val)
190 { return extract_key(r_val, s_set_ind); }
191
192 PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC
193 inline typename PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::key_const_reference
194 PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::
195 extract_key(const_reference r_val, true_type)
196 { return r_val; }
197
198 PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC
199 inline typename PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::key_const_reference
200 PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::
201 extract_key(const_reference r_val, false_type)
202 { return r_val.first; }
203
204#ifdef _GLIBCXX_DEBUG
205 PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC
206 bool
207 PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::
208 operator()(key_const_reference r_lhs, key_const_reference r_rhs)
209 { return cmp_keys(r_lhs, r_rhs); }
210#endif
211
212#undef PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC
213#undef PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC
214
215 } // namespace detail
216} // namespace __gnu_pbds
217
218#endif
integral_constant< bool, true > true_type
The type used as a compile-time boolean with true value.
Definition: type_traits:82
integral_constant< bool, false > false_type
The type used as a compile-time boolean with false value.
Definition: type_traits:85
GNU extensions for policy-based data structures for public use.
Synthetic element access traits.