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1 // -*- C++ -*-
2
3 // Copyright (C) 2005, 2006 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 2, 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 // 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.
20
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
25 // produce an executable, this file does not by itself cause the
26 // resulting executable to be covered by the GNU General Public
27 // License.  This exception does not however invalidate any other
28 // reasons why the executable file might be covered by the GNU General
29 // Public License.
30
31 // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
32
33 // Permission to use, copy, modify, sell, and distribute this software
34 // is hereby granted without fee, provided that the above copyright
35 // notice appears in all copies, and that both that copyright notice
36 // and this permission notice appear in supporting documentation. None
37 // of the above authors, nor IBM Haifa Research Laboratories, make any
38 // representation about the suitability of this software for any
39 // purpose. It is provided "as is" without express or implied
40 // warranty.
41
42 /**
43  * @file node_iterators.hpp
44  * Contains an implementation class for bin_search_tree_.
45  */
46
47 #ifndef PB_DS_BIN_SEARCH_TREE_NODE_ITERATORS_HPP
48 #define PB_DS_BIN_SEARCH_TREE_NODE_ITERATORS_HPP
49
50 #include <ext/pb_ds/tag_and_trait.hpp>
51
52 namespace pb_ds
53 {
54   namespace detail
55   {
56
57 #define PB_DS_TREE_CONST_NODE_ITERATOR_CLASS_C_DEC                      \
58     bin_search_tree_const_node_it_<                                     \
59                                                         Node,           \
60                                                         Const_Iterator, \
61                                                         Iterator,       \
62                                                         Allocator>
63
64     // Const node iterator.
65     template<typename Node,
66              class Const_Iterator,
67              class Iterator,
68              class Allocator>
69     class bin_search_tree_const_node_it_
70     {
71     private:
72
73     private:
74       typedef
75       typename Allocator::template rebind<
76       Node>::other::pointer
77       node_pointer;
78
79     public:
80
81       // Category.
82       typedef trivial_iterator_tag iterator_category;
83
84       // Difference type.
85       typedef trivial_iterator_difference_type difference_type;
86
87       // __Iterator's value type.
88       typedef Const_Iterator value_type;
89
90       // __Iterator's reference type.
91       typedef Const_Iterator reference;
92
93       // __Iterator's __const reference type.
94       typedef Const_Iterator const_reference;
95
96       // Metadata type.
97       typedef typename Node::metadata_type metadata_type;
98
99       // Const metadata reference type.
100       typedef
101       typename Allocator::template rebind<
102         metadata_type>::other::const_reference
103       const_metadata_reference;
104
105     public:
106
107       // Default constructor.
108       /*
109         inline
110         bin_search_tree_const_node_it_()
111       */
112
113       inline
114       bin_search_tree_const_node_it_(const node_pointer p_nd = NULL) : m_p_nd(const_cast<node_pointer>(p_nd))
115       { }
116
117       // Access.
118       inline const_reference
119       operator*() const
120       {
121         return (Const_Iterator(m_p_nd));
122       }
123
124       // Metadata access.
125       inline const_metadata_reference
126       get_metadata() const
127       {
128         return (m_p_nd->get_metadata());
129       }
130
131       // Returns the __const node iterator associated with the left node.
132       inline PB_DS_TREE_CONST_NODE_ITERATOR_CLASS_C_DEC
133       get_l_child() const
134       {
135         return (PB_DS_TREE_CONST_NODE_ITERATOR_CLASS_C_DEC(m_p_nd->m_p_left));
136       }
137
138       // Returns the __const node iterator associated with the right node.
139       inline PB_DS_TREE_CONST_NODE_ITERATOR_CLASS_C_DEC
140       get_r_child() const
141       {
142         return (PB_DS_TREE_CONST_NODE_ITERATOR_CLASS_C_DEC(m_p_nd->m_p_right));
143       }
144
145       // Compares to a different iterator object.
146       inline bool
147       operator==(const PB_DS_TREE_CONST_NODE_ITERATOR_CLASS_C_DEC& other) const
148       {
149         return (m_p_nd == other.m_p_nd);
150       }
151
152       // Compares (negatively) to a different iterator object.
153       inline bool
154       operator!=(const PB_DS_TREE_CONST_NODE_ITERATOR_CLASS_C_DEC& other) const
155       {
156         return (m_p_nd != other.m_p_nd);
157       }
158
159     public:
160       node_pointer m_p_nd;
161     };
162
163 #define PB_DS_TREE_NODE_ITERATOR_CLASS_C_DEC                    \
164     bin_search_tree_node_it_<                                   \
165                                                 Node,           \
166                                                 Const_Iterator, \
167                                                 Iterator,       \
168                                                 Allocator>
169
170     // Node iterator.
171     template<typename Node,
172              class Const_Iterator,
173              class Iterator,
174              class Allocator>
175     class bin_search_tree_node_it_ : 
176       public PB_DS_TREE_CONST_NODE_ITERATOR_CLASS_C_DEC
177
178     {
179
180     private:
181       typedef
182       typename Allocator::template rebind<
183       Node>::other::pointer
184       node_pointer;
185
186     public:
187
188       // __Iterator's value type.
189       typedef Iterator value_type;
190
191       // __Iterator's reference type.
192       typedef Iterator reference;
193
194       // __Iterator's __const reference type.
195       typedef Iterator const_reference;
196
197     public:
198
199       // Default constructor.
200       /*
201         inline
202         bin_search_tree_node_it_();
203       */
204
205       inline
206       bin_search_tree_node_it_(const node_pointer p_nd = NULL) : PB_DS_TREE_CONST_NODE_ITERATOR_CLASS_C_DEC(
207                                                                                                             const_cast<node_pointer>(p_nd))
208       { }
209
210       // Access.
211       inline Iterator
212       operator*() const
213       {
214         return (Iterator(PB_DS_TREE_CONST_NODE_ITERATOR_CLASS_C_DEC::m_p_nd));
215       }
216
217       // Returns the node iterator associated with the left node.
218       inline PB_DS_TREE_NODE_ITERATOR_CLASS_C_DEC
219       get_l_child() const
220       {
221         return (PB_DS_TREE_NODE_ITERATOR_CLASS_C_DEC(
222                                                      PB_DS_TREE_CONST_NODE_ITERATOR_CLASS_C_DEC::m_p_nd->m_p_left));
223       }
224
225       // Returns the node iterator associated with the right node.
226       inline PB_DS_TREE_NODE_ITERATOR_CLASS_C_DEC
227       get_r_child() const
228       {
229         return (PB_DS_TREE_NODE_ITERATOR_CLASS_C_DEC(
230                                                      PB_DS_TREE_CONST_NODE_ITERATOR_CLASS_C_DEC::m_p_nd->m_p_right));
231       }
232
233     };
234
235 #undef PB_DS_TREE_CONST_NODE_ITERATOR_CLASS_C_DEC
236
237 #undef PB_DS_TREE_NODE_ITERATOR_CLASS_C_DEC
238
239   } // namespace detail
240 } // namespace pb_ds
241
242 #endif // #ifndef PB_DS_BIN_SEARCH_TREE_NODE_ITERATORS_HPP
243