libstdc++
trie_policy/node_metadata_selector.hpp
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1// -*- C++ -*-
2
3// Copyright (C) 2005-2022 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.
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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
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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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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
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25// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
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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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30// and this permission notice appear in supporting documentation. None
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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
46
47namespace __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>
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>
85 {
86 private:
88 typedef Node_Update<__it_type, __it_type, Cmp_Fn, _Alloc> __node_u;
90
91 enum
92 {
93 null_update = is_same<__node_u, __nnode_u>::value
94 };
95
96 public:
98 };
99 ///@}
100 } // namespace detail
101} // namespace __gnu_pbds
102
103#endif // #ifndef PB_DS_TRIE_NODE_METADATA_DISPATCH_HPP
GNU extensions for policy-based data structures for public use.
Represents no type, or absence of type, for template tricks.
A null node updator, indicating that no node updates are required.