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 node_iterators.hpp 38 * Contains an implementation class for ov_tree_. 39 */ 40 41 #ifndef PB_DS_OV_TREE_NODE_ITERATORS_HPP 42 #define PB_DS_OV_TREE_NODE_ITERATORS_HPP 43 44 #include <ext/pb_ds/tag_and_trait.hpp> 45 #include <ext/pb_ds/detail/type_utils.hpp> 46 #include <debug/debug.h> 47 48 namespace __gnu_pbds 49 { 50 namespace detail 51 { 52 53 #define PB_DS_OV_TREE_CONST_NODE_ITERATOR_C_DEC \ 54 ov_tree_node_const_it_<Value_Type, Metadata_Type, Allocator> 55 56 // Const node reference. 57 template<typename Value_Type, typename Metadata_Type, class Allocator> 58 class ov_tree_node_const_it_ 59 { 60 61 protected: 62 typedef 63 typename Allocator::template rebind< 64 Value_Type>::other::pointer 65 pointer; 66 67 typedef 68 typename Allocator::template rebind< 69 Value_Type>::other::const_pointer 70 const_pointer; 71 72 typedef 73 typename Allocator::template rebind< 74 Metadata_Type>::other::const_pointer 75 const_metadata_pointer; 76 77 typedef PB_DS_OV_TREE_CONST_NODE_ITERATOR_C_DEC this_type; 78 79 protected: 80 81 template<typename Ptr> 82 inline static Ptr 83 mid_pointer(Ptr p_begin, Ptr p_end) 84 { 85 _GLIBCXX_DEBUG_ASSERT(p_end >= p_begin); 86 return (p_begin + (p_end - p_begin) / 2); 87 } 88 89 public: 90 91 typedef trivial_iterator_tag iterator_category; 92 93 typedef trivial_iterator_difference_type difference_type; 94 95 typedef 96 typename Allocator::template rebind< 97 Value_Type>::other::const_pointer 98 value_type; 99 100 typedef 101 typename Allocator::template rebind< 102 typename remove_const< 103 Value_Type>::type>::other::const_pointer 104 reference; 105 106 typedef 107 typename Allocator::template rebind< 108 typename remove_const< 109 Value_Type>::type>::other::const_pointer 110 const_reference; 111 112 typedef Metadata_Type metadata_type; 113 114 typedef 115 typename Allocator::template rebind< 116 metadata_type>::other::const_reference 117 const_metadata_reference; 118 119 public: 120 inline 121 ov_tree_node_const_it_(const_pointer p_nd = NULL, const_pointer p_begin_nd = NULL, const_pointer p_end_nd = NULL, const_metadata_pointer p_metadata = NULL) : m_p_value(const_cast<pointer>(p_nd)), m_p_begin_value(const_cast<pointer>(p_begin_nd)), m_p_end_value(const_cast<pointer>(p_end_nd)), m_p_metadata(p_metadata) 122 { } 123 124 inline const_reference 125 operator*() const 126 { return m_p_value; } 127 128 inline const_metadata_reference 129 get_metadata() const 130 { 131 enum 132 { 133 has_metadata = !is_same<Metadata_Type, null_node_metadata>::value 134 }; 135 136 PB_DS_STATIC_ASSERT(should_have_metadata, has_metadata); 137 _GLIBCXX_DEBUG_ASSERT(m_p_metadata != NULL); 138 return *m_p_metadata; 139 } 140 141 inline this_type 142 get_l_child() const 143 { 144 if (m_p_begin_value == m_p_value) 145 return (this_type(m_p_begin_value, m_p_begin_value, m_p_begin_value)); 146 147 const_metadata_pointer p_begin_metadata = 148 m_p_metadata - (m_p_value - m_p_begin_value); 149 150 return (this_type(mid_pointer(m_p_begin_value, m_p_value), 151 m_p_begin_value, 152 m_p_value, 153 mid_pointer(p_begin_metadata, m_p_metadata))); 154 } 155 156 inline this_type 157 get_r_child() const 158 { 159 if (m_p_value == m_p_end_value) 160 return (this_type(m_p_end_value, m_p_end_value, m_p_end_value)); 161 162 const_metadata_pointer p_end_metadata = 163 m_p_metadata + (m_p_end_value - m_p_value); 164 165 return (this_type(mid_pointer(m_p_value + 1, m_p_end_value), 166 m_p_value + 1, 167 m_p_end_value,(m_p_metadata == NULL) ? 168 NULL : mid_pointer(m_p_metadata + 1, p_end_metadata))); 169 } 170 171 inline bool 172 operator==(const this_type& other) const 173 { 174 const bool is_end = m_p_begin_value == m_p_end_value; 175 const bool is_other_end = other.m_p_begin_value == other.m_p_end_value; 176 177 if (is_end) 178 return (is_other_end); 179 180 if (is_other_end) 181 return (is_end); 182 183 return m_p_value == other.m_p_value; 184 } 185 186 inline bool 187 operator!=(const this_type& other) const 188 { return !operator==(other); } 189 190 public: 191 pointer m_p_value; 192 pointer m_p_begin_value; 193 pointer m_p_end_value; 194 195 const_metadata_pointer m_p_metadata; 196 }; 197 198 #define PB_DS_OV_TREE_NODE_ITERATOR_C_DEC \ 199 ov_tree_node_it_<Value_Type, Metadata_Type, Allocator> 200 201 // Node reference. 202 template<typename Value_Type, typename Metadata_Type, class Allocator> 203 class ov_tree_node_it_ : public PB_DS_OV_TREE_CONST_NODE_ITERATOR_C_DEC 204 { 205 206 private: 207 typedef PB_DS_OV_TREE_NODE_ITERATOR_C_DEC this_type; 208 209 typedef PB_DS_OV_TREE_CONST_NODE_ITERATOR_C_DEC base_type; 210 211 typedef typename base_type::pointer pointer; 212 213 typedef typename base_type::const_pointer const_pointer; 214 215 typedef 216 typename base_type::const_metadata_pointer 217 const_metadata_pointer; 218 219 public: 220 221 typedef trivial_iterator_tag iterator_category; 222 223 typedef trivial_iterator_difference_type difference_type; 224 225 typedef 226 typename Allocator::template rebind< 227 Value_Type>::other::pointer 228 value_type; 229 230 typedef 231 typename Allocator::template rebind< 232 typename remove_const< 233 Value_Type>::type>::other::pointer 234 reference; 235 236 typedef 237 typename Allocator::template rebind< 238 typename remove_const< 239 Value_Type>::type>::other::pointer 240 const_reference; 241 242 public: 243 inline 244 ov_tree_node_it_(const_pointer p_nd = NULL, const_pointer p_begin_nd = NULL, const_pointer p_end_nd = NULL, const_metadata_pointer p_metadata = NULL) : base_type(p_nd, p_begin_nd, p_end_nd, p_metadata) 245 { } 246 247 // Access. 248 inline reference 249 operator*() const 250 { return reference(base_type::m_p_value); } 251 252 // Returns the node reference associated with the left node. 253 inline ov_tree_node_it_ 254 get_l_child() const 255 { 256 if (base_type::m_p_begin_value == base_type::m_p_value) 257 return (this_type(base_type::m_p_begin_value, base_type::m_p_begin_value, base_type::m_p_begin_value)); 258 259 const_metadata_pointer p_begin_metadata = 260 base_type::m_p_metadata - (base_type::m_p_value - base_type::m_p_begin_value); 261 262 return (this_type(base_type::mid_pointer(base_type::m_p_begin_value, base_type::m_p_value), 263 base_type::m_p_begin_value, 264 base_type::m_p_value, 265 base_type::mid_pointer(p_begin_metadata, base_type::m_p_metadata))); 266 } 267 268 // Returns the node reference associated with the right node. 269 inline ov_tree_node_it_ 270 get_r_child() const 271 { 272 if (base_type::m_p_value == base_type::m_p_end_value) 273 return (this_type(base_type::m_p_end_value, base_type::m_p_end_value, base_type::m_p_end_value)); 274 275 const_metadata_pointer p_end_metadata = 276 base_type::m_p_metadata + (base_type::m_p_end_value - base_type::m_p_value); 277 278 return (this_type(base_type::mid_pointer(base_type::m_p_value + 1, base_type::m_p_end_value), 279 base_type::m_p_value + 1, 280 base_type::m_p_end_value,(base_type::m_p_metadata == NULL)? 281 NULL : base_type::mid_pointer(base_type::m_p_metadata + 1, p_end_metadata))); 282 } 283 284 }; 285 286 #undef PB_DS_OV_TREE_NODE_ITERATOR_C_DEC 287 #undef PB_DS_OV_TREE_CONST_NODE_ITERATOR_C_DEC 288 289 } // namespace detail 290 } // namespace __gnu_pbds 291 292 #endif 293
