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 tree_policy/node_metadata_selector.hpp 38 * Contains an implementation class for trees. 39 */ 40 41 #ifndef PB_DS_TREE_NODE_METADATA_DISPATCH_HPP 42 #define PB_DS_TREE_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 /// Tree metadata helper. 57 template<typename Node_Update, bool _BTp> 58 struct tree_metadata_helper; 59 60 /// Specialization, false. 61 template<typename Node_Update> 62 struct tree_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 tree_metadata_helper<Node_Update, true> 70 { 71 typedef null_type type; 72 }; 73 74 /// Tree 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 tree_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 tree_metadata_helper<__node_u, null_update>::type type; 98 }; 99 //@} 100 } // namespace detail 101 } // namespace __gnu_pbds 102 103 #endif // #ifndef PB_DS_TREE_NODE_METADATA_DISPATCH_HPP 104
