libstdc++

trie_policy/node_metadata_selector.hpp
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1 // -*- C++ -*-
2
3 // Copyright (C) 2005-2013 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 trie_policy/node_metadata_selector.hpp
38 * Contains an implementation class for tries.
39 */
40
41 #ifndef PB_DS_TRIE_NODE_METADATA_DISPATCH_HPP
42 #define PB_DS_TRIE_NODE_METADATA_DISPATCH_HPP
43
44 #include <ext/pb_ds/detail/branch_policy/null_node_metadata.hpp>
45 #include <ext/pb_ds/detail/types_traits.hpp>
46
47 namespace __gnu_pbds
48 {
49 namespace detail
50 {
51 /**
52 * @addtogroup traits Traits
53 * @{
54 */
55
56 /// Trie metadata helper.
57 template<typename Node_Update, bool _BTp>
58 struct trie_metadata_helper;
59
60 /// Specialization, false.
61 template<typename Node_Update>
62 struct trie_metadata_helper<Node_Update, false>
63 {
64 typedef typename Node_Update::metadata_type type;
65 };
66
67 /// Specialization, true.
68 template<typename Node_Update>
69 struct trie_metadata_helper<Node_Update, true>
70 {
71 typedef null_type type;
72 };
73
74 /// Trie node metadata dispatch.
75 template<typename Key,
76 typename Data,
77 typename Cmp_Fn,
78 template<typename Node_CItr,
79 typename Const_Iterator,
80 typename Cmp_Fn_,
81 typename _Alloc_>
82 class Node_Update,
83 typename _Alloc>
84 struct trie_node_metadata_dispatch
85 {
86 private:
87 typedef dumnode_const_iterator<Key, Data, _Alloc> __it_type;
88 typedef Node_Update<__it_type, __it_type, Cmp_Fn, _Alloc> __node_u;
89 typedef null_node_update<__it_type, __it_type, Cmp_Fn, _Alloc> __nnode_u;
90
91 enum
92 {
93 null_update = is_same<__node_u, __nnode_u>::value
94 };
95
96 public:
97 typedef typename trie_metadata_helper<__node_u, null_update>::type type;
98 };
99 //@}
100 } // namespace detail
101 } // namespace __gnu_pbds
102
103 #endif // #ifndef PB_DS_TRIE_NODE_METADATA_DISPATCH_HPP