1// -*- C++ -*- 2 3// Copyright (C) 2005, 2006, 2009 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 node_metadata_selector.hpp 38 * Contains an implementation class for trees. 39 */ 40 41#ifndef PB_DS_TREE_NODE_METADATA_SELECTOR_HPP 42#define PB_DS_TREE_NODE_METADATA_SELECTOR_HPP 43 44#include <ext/pb_ds/detail/basic_tree_policy/null_node_metadata.hpp> 45#include <ext/pb_ds/detail/types_traits.hpp> 46 47namespace __gnu_pbds 48{ 49 namespace detail 50 { 51 52 template<typename Node_Update, bool Null> 53 struct tree_metadata_helper 54 { 55 typedef typename Node_Update::metadata_type type; 56 }; 57 58 template<typename Node_Update> 59 struct tree_metadata_helper< 60 Node_Update, 61 true> 62 { 63 typedef null_node_metadata type; 64 }; 65 66 template<typename Key, 67 typename Data, 68 class Cmp_Fn, 69 template<typename Const_Node_Iterator, 70 class Const_Iterator, 71 class Cmp_Fn_, 72 class Allocator_> 73 class Node_Update, 74 class Allocator> 75 struct tree_node_metadata_selector 76 { 77 private: 78 typedef 79 dumconst_node_iterator< 80 Key, 81 Data, 82 Allocator> 83 dumconst_node_it; 84 85 enum 86 { 87 null_update = 88 is_same< 89 Node_Update< 90 dumconst_node_it, 91 dumconst_node_it, 92 Cmp_Fn, 93 Allocator>, 94 null_tree_node_update< 95 dumconst_node_it, 96 dumconst_node_it, 97 Cmp_Fn, 98 Allocator> >::value 99 }; 100 101 public: 102 typedef 103 typename tree_metadata_helper< 104 Node_Update< 105 dumconst_node_it, 106 dumconst_node_it, 107 Cmp_Fn, 108 Allocator>, 109 null_update>::type 110 type; 111 }; 112 113 } // namespace detail 114} // namespace __gnu_pbds 115 116#endif // #ifndef PB_DS_TREE_NODE_METADATA_SELECTOR_HPP 117