3 // Copyright (C) 2005, 2006, 2009, 2011 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 3, or (at your option) any later
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.
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.
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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/>.
25 // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
27 // Permission to use, copy, modify, sell, and distribute this software
28 // is hereby granted without fee, provided that the above copyright
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37 * @file branch_policy/branch_policy.hpp
38 * Contains a base class for branch policies.
41 #ifndef PB_DS_BRANCH_POLICY_BASE_HPP
42 #define PB_DS_BRANCH_POLICY_BASE_HPP
44 #include <ext/pb_ds/tag_and_trait.hpp>
48 /// A null node updator, indicating that no node updates are required.
49 template<typename _Tp1, typename _Tp2, typename _Tp3, typename _Tp4>
50 struct null_node_update : public null_type
55 /// Primary template, base class for branch structure policies.
56 template<typename Node_CItr, typename Node_Itr, typename _Alloc>
60 typedef typename Node_Itr::value_type it_type;
61 typedef typename std::iterator_traits<it_type>::value_type value_type;
62 typedef typename value_type::first_type key_type;
64 typedef typename remove_const<value_type>::type rcvalue_type;
65 typedef typename remove_const<key_type>::type rckey_type;
67 typedef typename _Alloc::template rebind<rcvalue_type>::other rebind_v;
68 typedef typename _Alloc::template rebind<rckey_type>::other rebind_k;
70 typedef typename rebind_v::reference reference;
71 typedef typename rebind_v::const_reference const_reference;
72 typedef typename rebind_v::const_pointer const_pointer;
74 typedef typename rebind_k::const_reference key_const_reference;
76 static inline key_const_reference
77 extract_key(const_reference r_val)
78 { return r_val.first; }
85 { return const_cast<branch_policy*>(this)->end(); }
91 /// Specialization for const iterators.
92 template<typename Node_CItr, typename _Alloc>
93 struct branch_policy<Node_CItr, Node_CItr, _Alloc>
96 typedef typename Node_CItr::value_type it_type;
97 typedef typename std::iterator_traits<it_type>::value_type value_type;
98 typedef typename remove_const<value_type>::type rcvalue_type;
99 typedef typename _Alloc::template rebind<rcvalue_type>::other rebind_v;
100 typedef typename rebind_v::reference reference;
101 typedef typename rebind_v::const_reference const_reference;
102 typedef typename rebind_v::const_pointer const_pointer;
104 typedef value_type key_type;
105 typedef typename rebind_v::const_reference key_const_reference;
107 static inline key_const_reference
108 extract_key(const_reference r_val)
121 } // namespace detail
122 } // namespace __gnu_pbds
124 #endif // #ifndef PB_DS_BRANCH_POLICY_BASE_HPP