3 // Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc.
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 2, or (at your option) any later
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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.
16 // You should have received a copy of the GNU General Public License
17 // along with this library; see the file COPYING. If not, write to
18 // the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
19 // MA 02111-1307, USA.
21 // As a special exception, you may use this file as part of a free
22 // software library without restriction. Specifically, if other files
23 // instantiate templates or use macros or inline functions from this
24 // file, or you compile this file and link it with other files to
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31 // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
33 // Permission to use, copy, modify, sell, and distribute this software
34 // is hereby granted without fee, provided that the above copyright
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43 * @file node_iterators.hpp
44 * Contains an implementation class for ov_tree_.
47 #ifndef PB_DS_OV_TREE_NODE_ITERATORS_HPP
48 #define PB_DS_OV_TREE_NODE_ITERATORS_HPP
50 #include <ext/pb_ds/tag_and_trait.hpp>
51 #include <ext/pb_ds/detail/type_utils.hpp>
52 #include <debug/debug.h>
59 #define PB_DS_OV_TREE_CONST_NODE_ITERATOR_C_DEC \
60 ov_tree_node_const_it_<Value_Type, Metadata_Type, Allocator>
62 // Const node reference.
63 template<typename Value_Type, typename Metadata_Type, class Allocator>
64 class ov_tree_node_const_it_
69 typename Allocator::template rebind<
70 Value_Type>::other::pointer
74 typename Allocator::template rebind<
75 Value_Type>::other::const_pointer
79 typename Allocator::template rebind<
80 Metadata_Type>::other::const_pointer
81 const_metadata_pointer;
83 typedef PB_DS_OV_TREE_CONST_NODE_ITERATOR_C_DEC this_type;
87 template<typename Ptr>
89 mid_pointer(Ptr p_begin, Ptr p_end)
91 _GLIBCXX_DEBUG_ASSERT(p_end >= p_begin);
92 return (p_begin + (p_end - p_begin) / 2);
97 typedef trivial_iterator_tag iterator_category;
99 typedef trivial_iterator_difference_type difference_type;
102 typename Allocator::template rebind<
103 Value_Type>::other::const_pointer
107 typename Allocator::template rebind<
108 typename remove_const<
109 Value_Type>::type>::other::const_pointer
113 typename Allocator::template rebind<
114 typename remove_const<
115 Value_Type>::type>::other::const_pointer
118 typedef Metadata_Type metadata_type;
121 typename Allocator::template rebind<
122 metadata_type>::other::const_reference
123 const_metadata_reference;
127 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)
130 inline const_reference
132 { return m_p_value; }
134 inline const_metadata_reference
139 has_metadata = !is_same<Metadata_Type, null_node_metadata>::value
142 PB_DS_STATIC_ASSERT(should_have_metadata, has_metadata);
143 _GLIBCXX_DEBUG_ASSERT(m_p_metadata != NULL);
144 return *m_p_metadata;
150 if (m_p_begin_value == m_p_value)
151 return (this_type(m_p_begin_value, m_p_begin_value, m_p_begin_value));
153 const_metadata_pointer p_begin_metadata =
154 m_p_metadata - (m_p_value - m_p_begin_value);
156 return (this_type(mid_pointer(m_p_begin_value, m_p_value),
159 mid_pointer(p_begin_metadata, m_p_metadata)));
165 if (m_p_value == m_p_end_value)
166 return (this_type(m_p_end_value, m_p_end_value, m_p_end_value));
168 const_metadata_pointer p_end_metadata =
169 m_p_metadata + (m_p_end_value - m_p_value);
171 return (this_type(mid_pointer(m_p_value + 1, m_p_end_value),
173 m_p_end_value,(m_p_metadata == NULL) ?
174 NULL : mid_pointer(m_p_metadata + 1, p_end_metadata)));
178 operator==(const this_type& other) const
180 const bool is_end = m_p_begin_value == m_p_end_value;
181 const bool is_other_end = other.m_p_begin_value == other.m_p_end_value;
184 return (is_other_end);
189 return m_p_value == other.m_p_value;
193 operator!=(const this_type& other) const
194 { return !operator==(other); }
198 pointer m_p_begin_value;
199 pointer m_p_end_value;
201 const_metadata_pointer m_p_metadata;
204 #define PB_DS_OV_TREE_NODE_ITERATOR_C_DEC \
205 ov_tree_node_it_<Value_Type, Metadata_Type, Allocator>
208 template<typename Value_Type, typename Metadata_Type, class Allocator>
209 class ov_tree_node_it_ : public PB_DS_OV_TREE_CONST_NODE_ITERATOR_C_DEC
213 typedef PB_DS_OV_TREE_NODE_ITERATOR_C_DEC this_type;
215 typedef PB_DS_OV_TREE_CONST_NODE_ITERATOR_C_DEC base_type;
217 typedef typename base_type::pointer pointer;
219 typedef typename base_type::const_pointer const_pointer;
222 typename base_type::const_metadata_pointer
223 const_metadata_pointer;
227 typedef trivial_iterator_tag iterator_category;
229 typedef trivial_iterator_difference_type difference_type;
232 typename Allocator::template rebind<
233 Value_Type>::other::pointer
237 typename Allocator::template rebind<
238 typename remove_const<
239 Value_Type>::type>::other::pointer
243 typename Allocator::template rebind<
244 typename remove_const<
245 Value_Type>::type>::other::pointer
250 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)
256 { return reference(base_type::m_p_value); }
258 // Returns the node reference associated with the left node.
259 inline ov_tree_node_it_
262 if (base_type::m_p_begin_value == base_type::m_p_value)
263 return (this_type(base_type::m_p_begin_value, base_type::m_p_begin_value, base_type::m_p_begin_value));
265 const_metadata_pointer p_begin_metadata =
266 base_type::m_p_metadata - (base_type::m_p_value - base_type::m_p_begin_value);
268 return (this_type(base_type::mid_pointer(base_type::m_p_begin_value, base_type::m_p_value),
269 base_type::m_p_begin_value,
270 base_type::m_p_value,
271 base_type::mid_pointer(p_begin_metadata, base_type::m_p_metadata)));
274 // Returns the node reference associated with the right node.
275 inline ov_tree_node_it_
278 if (base_type::m_p_value == base_type::m_p_end_value)
279 return (this_type(base_type::m_p_end_value, base_type::m_p_end_value, base_type::m_p_end_value));
281 const_metadata_pointer p_end_metadata =
282 base_type::m_p_metadata + (base_type::m_p_end_value - base_type::m_p_value);
284 return (this_type(base_type::mid_pointer(base_type::m_p_value + 1, base_type::m_p_end_value),
285 base_type::m_p_value + 1,
286 base_type::m_p_end_value,(base_type::m_p_metadata == NULL)?
287 NULL : base_type::mid_pointer(base_type::m_p_metadata + 1, p_end_metadata)));
292 #undef PB_DS_OV_TREE_NODE_ITERATOR_C_DEC
293 #undef PB_DS_OV_TREE_CONST_NODE_ITERATOR_C_DEC
295 } // namespace detail