1 // -*- C++ -*- 2 3 // Copyright (C) 2005, 2006 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 2, 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 // You should have received a copy of the GNU General Public License 17 // along with this library; see the file COPYING. If not, write to 18 // the Free Software Foundation, 59 Temple Place - Suite 330, Boston, 19 // MA 02111-1307, USA. 20 21 // As a special exception, you may use this file as part of a free 22 // software library without restriction. Specifically, if other files 23 // instantiate templates or use macros or inline functions from this 24 // file, or you compile this file and link it with other files to 25 // produce an executable, this file does not by itself cause the 26 // resulting executable to be covered by the GNU General Public 27 // License. This exception does not however invalidate any other 28 // reasons why the executable file might be covered by the GNU General 29 // Public License. 30 31 // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL. 32 33 // Permission to use, copy, modify, sell, and distribute this software 34 // is hereby granted without fee, provided that the above copyright 35 // notice appears in all copies, and that both that copyright notice 36 // and this permission notice appear in supporting documentation. None 37 // of the above authors, nor IBM Haifa Research Laboratories, make any 38 // representation about the suitability of this software for any 39 // purpose. It is provided "as is" without express or implied 40 // warranty. 41 42 /** 43 * @file node_metadata_selector.hpp 44 * Contains an implementation class for tries. 45 */ 46 47 #ifndef PB_DS_TRIE_NODE_METADATA_SELECTOR_HPP 48 #define PB_DS_TRIE_NODE_METADATA_SELECTOR_HPP 49 50 #include <ext/pb_ds/detail/basic_tree_policy/null_node_metadata.hpp> 51 #include <ext/pb_ds/detail/types_traits.hpp> 52 53 namespace pb_ds 54 { 55 namespace detail 56 { 57 58 template<typename Node_Update, bool Null> 59 struct trie_metadata_helper 60 { 61 typedef typename Node_Update::metadata_type type; 62 }; 63 64 template<typename Node_Update> 65 struct trie_metadata_helper< 66 Node_Update, 67 true> 68 { 69 typedef null_node_metadata type; 70 }; 71 72 template<typename Key, 73 typename Data, 74 class Cmp_Fn, 75 template<typename Const_Node_Iterator, 76 class Const_Iterator, 77 class Cmp_Fn_, 78 class Allocator_> 79 class Node_Update, 80 class Allocator> 81 struct trie_node_metadata_selector 82 { 83 private: 84 typedef 85 dumconst_node_iterator< 86 Key, 87 Data, 88 Allocator> 89 dumconst_node_it; 90 91 enum 92 { 93 null_update = 94 is_same< 95 Node_Update< 96 dumconst_node_it, 97 dumconst_node_it, 98 Cmp_Fn, 99 Allocator>, 100 null_trie_node_update< 101 dumconst_node_it, 102 dumconst_node_it, 103 Cmp_Fn, 104 Allocator> >::value 105 }; 106 107 public: 108 typedef 109 typename trie_metadata_helper< 110 Node_Update< 111 dumconst_node_it, 112 dumconst_node_it, 113 Cmp_Fn, 114 Allocator>, 115 null_update>::type 116 type; 117 }; 118 119 } // namespace detail 120 } // namespace pb_ds 121 122 #endif // #ifndef PB_DS_TRIE_NODE_METADATA_SELECTOR_HPP 123