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1 // -*- C++ -*-
2
3 // Copyright (C) 2005, 2006, 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 basic_tree_policy_base.hpp
38  * Contains a base class for tree_like policies.
39  */
40
41 #ifndef PB_DS_TREE_LIKE_POLICY_BASE_HPP
42 #define PB_DS_TREE_LIKE_POLICY_BASE_HPP
43
44 namespace __gnu_pbds
45 {
46   namespace detail
47   {
48
49 #define PB_DS_CLASS_C_DEC                                               \
50     basic_tree_policy_base<                                             \
51                                                         Const_Node_Iterator, \
52                                                         Node_Iterator,  \
53                                                         Allocator>
54
55     template<typename Const_Node_Iterator,
56              typename Node_Iterator,
57              typename Allocator>
58     struct basic_tree_policy_base
59     {
60     protected:
61       typedef typename Node_Iterator::value_type it_type;
62
63       typedef typename std::iterator_traits< it_type>::value_type value_type;
64
65       typedef typename value_type::first_type key_type;
66
67       typedef
68       typename Allocator::template rebind<
69         typename remove_const<
70         key_type>::type>::other::const_reference
71       const_key_reference;
72
73       typedef
74       typename Allocator::template rebind<
75         typename remove_const<
76         value_type>::type>::other::const_reference
77       const_reference;
78
79       typedef
80       typename Allocator::template rebind<
81         typename remove_const<
82         value_type>::type>::other::reference
83       reference;
84
85       typedef
86       typename Allocator::template rebind<
87         typename remove_const<
88         value_type>::type>::other::const_pointer
89       const_pointer;
90
91       static inline const_key_reference
92       extract_key(const_reference r_val)
93       {
94         return (r_val.first);
95       }
96
97       virtual it_type
98       end() = 0;
99
100       it_type
101       end_iterator() const
102       {
103         return (const_cast<PB_DS_CLASS_C_DEC* >(this)->end());
104       }
105
106       virtual
107       ~basic_tree_policy_base()
108       { }
109     };
110
111     template<typename Const_Node_Iterator, typename Allocator>
112     struct basic_tree_policy_base<
113       Const_Node_Iterator,
114       Const_Node_Iterator,
115       Allocator>
116     {
117     protected:
118       typedef typename Const_Node_Iterator::value_type it_type;
119
120       typedef typename std::iterator_traits< it_type>::value_type value_type;
121
122       typedef value_type key_type;
123
124       typedef
125       typename Allocator::template rebind<
126         typename remove_const<
127         key_type>::type>::other::const_reference
128       const_key_reference;
129
130       typedef
131       typename Allocator::template rebind<
132         typename remove_const<
133         value_type>::type>::other::const_reference
134       const_reference;
135
136       typedef
137       typename Allocator::template rebind<
138         typename remove_const<
139         value_type>::type>::other::reference
140       reference;
141
142       typedef
143       typename Allocator::template rebind<
144         typename remove_const<
145         value_type>::type>::other::const_pointer
146       const_pointer;
147
148       static inline const_key_reference
149       extract_key(const_reference r_val)
150       {
151         return (r_val);
152       }
153
154       virtual it_type
155       end() const = 0;
156
157       it_type
158       end_iterator() const
159       {
160         return (end());
161       }
162
163       virtual
164       ~basic_tree_policy_base()
165       { }
166     };
167
168 #undef PB_DS_CLASS_C_DEC
169
170   } // namespace detail
171 } // namespace __gnu_pbds
172
173 #endif // #ifndef PB_DS_TREE_LIKE_POLICY_BASE_HPP