1 // -*- C++ -*- 2 3 // Copyright (C) 2005-2018 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 pairing_heap_/pairing_heap_.hpp 38 * Contains an implementation class for a pairing heap. 39 */ 40 41 /* 42 * Pairing heap: 43 * Michael L. Fredman, Robert Sedgewick, Daniel Dominic Sleator, 44 * and Robert Endre Tarjan, The Pairing Heap: 45 * A New Form of Self-Adjusting Heap, Algorithmica, 1(1):111-129, 1986. 46 */ 47 48 #include <ext/pb_ds/detail/cond_dealtor.hpp> 49 #include <ext/pb_ds/detail/type_utils.hpp> 50 #include <ext/pb_ds/detail/left_child_next_sibling_heap_/left_child_next_sibling_heap_.hpp> 51 #include <debug/debug.h> 52 53 namespace __gnu_pbds 54 { 55 namespace detail 56 { 57 #define PB_DS_CLASS_T_DEC \ 58 template<typename Value_Type, typename Cmp_Fn, typename _Alloc> 59 60 #define PB_DS_CLASS_C_DEC \ 61 pairing_heap<Value_Type, Cmp_Fn, _Alloc> 62 63 #ifdef _GLIBCXX_DEBUG 64 #define PB_DS_P_HEAP_BASE \ 65 left_child_next_sibling_heap<Value_Type, Cmp_Fn, null_type, _Alloc, false> 66 #else 67 #define PB_DS_P_HEAP_BASE \ 68 left_child_next_sibling_heap<Value_Type, Cmp_Fn, null_type, _Alloc> 69 #endif 70 71 /** 72 * Pairing heap. 73 * 74 * @ingroup heap-detail 75 */ 76 template<typename Value_Type, typename Cmp_Fn, typename _Alloc> 77 class pairing_heap : public PB_DS_P_HEAP_BASE 78 { 79 private: 80 typedef PB_DS_P_HEAP_BASE base_type; 81 typedef typename base_type::node_pointer node_pointer; 82 83 typedef typename _Alloc::template rebind<Value_Type>::other __rebind_a; 84 85 public: 86 typedef Value_Type value_type; 87 typedef Cmp_Fn cmp_fn; 88 typedef _Alloc allocator_type; 89 typedef typename _Alloc::size_type size_type; 90 typedef typename _Alloc::difference_type difference_type; 91 92 typedef typename __rebind_a::pointer pointer; 93 typedef typename __rebind_a::const_pointer const_pointer; 94 typedef typename __rebind_a::reference reference; 95 typedef typename __rebind_a::const_reference const_reference; 96 97 typedef typename base_type::point_const_iterator point_const_iterator; 98 typedef typename base_type::point_iterator point_iterator; 99 typedef typename base_type::const_iterator const_iterator; 100 typedef typename base_type::iterator iterator; 101 102 pairing_heap(); 103 104 pairing_heap(const Cmp_Fn&); 105 106 pairing_heap(const pairing_heap&); 107 108 void 109 swap(pairing_heap&); 110 111 ~pairing_heap(); 112 113 inline point_iterator 114 push(const_reference); 115 116 void 117 modify(point_iterator, const_reference); 118 119 inline const_reference 120 top() const; 121 122 void 123 pop(); 124 125 void 126 erase(point_iterator); 127 128 template<typename Pred> 129 size_type 130 erase_if(Pred); 131 132 template<typename Pred> 133 void 134 split(Pred, pairing_heap&); 135 136 void 137 join(pairing_heap&); 138 139 protected: 140 141 template<typename It> 142 void 143 copy_from_range(It, It); 144 145 #ifdef _GLIBCXX_DEBUG 146 void 147 assert_valid(const char*, int) const; 148 #endif 149 150 private: 151 152 inline void 153 push_imp(node_pointer); 154 155 node_pointer 156 join_node_children(node_pointer); 157 158 node_pointer 159 forward_join(node_pointer, node_pointer); 160 161 node_pointer 162 back_join(node_pointer, node_pointer); 163 164 void 165 remove_node(node_pointer); 166 }; 167 168 #define PB_DS_ASSERT_NODE_CONSISTENT(_Node, _Bool) \ 169 _GLIBCXX_DEBUG_ONLY(base_type::assert_node_consistent(_Node, _Bool, \ 170 __FILE__, __LINE__);) 171 172 #include <ext/pb_ds/detail/pairing_heap_/constructors_destructor_fn_imps.hpp> 173 #include <ext/pb_ds/detail/pairing_heap_/debug_fn_imps.hpp> 174 #include <ext/pb_ds/detail/pairing_heap_/find_fn_imps.hpp> 175 #include <ext/pb_ds/detail/pairing_heap_/insert_fn_imps.hpp> 176 #include <ext/pb_ds/detail/pairing_heap_/erase_fn_imps.hpp> 177 #include <ext/pb_ds/detail/pairing_heap_/split_join_fn_imps.hpp> 178 179 #undef PB_DS_ASSERT_NODE_CONSISTENT 180 #undef PB_DS_CLASS_C_DEC 181 #undef PB_DS_CLASS_T_DEC 182 #undef PB_DS_P_HEAP_BASE 183 184 } // namespace detail 185 } // namespace __gnu_pbds 186