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1 | // -*- C++ -*- |
2 | ||
3 | // Copyright (C) 2005, 2006, 2009, 2011 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 branch_policy/branch_policy.hpp | |
38 | * Contains a base class for branch policies. | |
39 | */ | |
40 | ||
41 | #ifndef PB_DS_BRANCH_POLICY_BASE_HPP | |
42 | #define PB_DS_BRANCH_POLICY_BASE_HPP | |
43 | ||
44 | #include <ext/pb_ds/tag_and_trait.hpp> | |
45 | ||
46 | namespace __gnu_pbds | |
47 | { | |
a345e45d BK |
48 | namespace detail |
49 | { | |
50 | /// Primary template, base class for branch structure policies. | |
51 | template<typename Node_CItr, typename Node_Itr, typename _Alloc> | |
52 | struct branch_policy | |
53 | { | |
54 | protected: | |
55 | typedef typename Node_Itr::value_type it_type; | |
56 | typedef typename std::iterator_traits<it_type>::value_type value_type; | |
57 | typedef typename value_type::first_type key_type; | |
58 | ||
59 | typedef typename remove_const<value_type>::type rcvalue_type; | |
60 | typedef typename remove_const<key_type>::type rckey_type; | |
61 | ||
62 | typedef typename _Alloc::template rebind<rcvalue_type>::other rebind_v; | |
63 | typedef typename _Alloc::template rebind<rckey_type>::other rebind_k; | |
64 | ||
65 | typedef typename rebind_v::reference reference; | |
66 | typedef typename rebind_v::const_reference const_reference; | |
67 | typedef typename rebind_v::const_pointer const_pointer; | |
68 | ||
69 | typedef typename rebind_k::const_reference key_const_reference; | |
70 | ||
71 | static inline key_const_reference | |
72 | extract_key(const_reference r_val) | |
73 | { return r_val.first; } | |
74 | ||
75 | virtual it_type | |
76 | end() = 0; | |
77 | ||
78 | it_type | |
79 | end_iterator() const | |
80 | { return const_cast<branch_policy*>(this)->end(); } | |
81 | ||
82 | virtual | |
83 | ~branch_policy() { } | |
84 | }; | |
85 | ||
86 | /// Specialization for const iterators. | |
87 | template<typename Node_CItr, typename _Alloc> | |
88 | struct branch_policy<Node_CItr, Node_CItr, _Alloc> | |
89 | { | |
90 | protected: | |
91 | typedef typename Node_CItr::value_type it_type; | |
92 | typedef typename std::iterator_traits<it_type>::value_type value_type; | |
93 | typedef typename remove_const<value_type>::type rcvalue_type; | |
94 | typedef typename _Alloc::template rebind<rcvalue_type>::other rebind_v; | |
95 | typedef typename rebind_v::reference reference; | |
96 | typedef typename rebind_v::const_reference const_reference; | |
97 | typedef typename rebind_v::const_pointer const_pointer; | |
98 | ||
99 | typedef value_type key_type; | |
100 | typedef typename rebind_v::const_reference key_const_reference; | |
101 | ||
102 | static inline key_const_reference | |
103 | extract_key(const_reference r_val) | |
104 | { return r_val; } | |
105 | ||
106 | virtual it_type | |
107 | end() const = 0; | |
108 | ||
109 | it_type | |
110 | end_iterator() const | |
111 | { return end(); } | |
112 | ||
113 | virtual | |
114 | ~branch_policy() { } | |
115 | }; | |
116 | } // namespace detail | |
117 | } // namespace __gnu_pbds | |
118 | ||
119 | #endif // #ifndef PB_DS_BRANCH_POLICY_BASE_HPP |