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 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 44 #include <ext/pb_ds/detail/type_utils.hpp> 45 46 namespace __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 67 synth_access_traits(); 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 219
