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 left_child_next_sibling_heap_/const_iterator.hpp 38 * Contains an iterator class returned by the table's const find and insert 39 * methods. 40 */ 41 42 #ifndef PB_DS_LEFT_CHILD_NEXT_SIBLING_HEAP_CONST_ITERATOR_HPP 43 #define PB_DS_LEFT_CHILD_NEXT_SIBLING_HEAP_CONST_ITERATOR_HPP 44 45 #include <ext/pb_ds/detail/left_child_next_sibling_heap_/point_const_iterator.hpp> 46 #include <debug/debug.h> 47 48 namespace __gnu_pbds 49 { 50 namespace detail 51 { 52 #define PB_DS_CLASS_C_DEC \ 53 left_child_next_sibling_heap_const_iterator_<Node, _Alloc> 54 55 #define PB_DS_BASIC_HEAP_CIT_BASE \ 56 left_child_next_sibling_heap_node_point_const_iterator_<Node, _Alloc> 57 58 /// Const point-type iterator. 59 template<typename Node, typename _Alloc> 60 class left_child_next_sibling_heap_const_iterator_ 61 : public PB_DS_BASIC_HEAP_CIT_BASE 62 { 63 private: 64 typedef PB_DS_BASIC_HEAP_CIT_BASE base_type; 65 typedef typename base_type::node_pointer node_pointer; 66 67 public: 68 /// Category. 69 typedef std::forward_iterator_tag iterator_category; 70 71 /// Difference type. 72 typedef typename _Alloc::difference_type difference_type; 73 74 /// Iterator's value type. 75 typedef typename base_type::value_type value_type; 76 77 /// Iterator's pointer type. 78 typedef typename base_type::pointer pointer; 79 80 /// Iterator's const pointer type. 81 typedef typename base_type::const_pointer const_pointer; 82 83 /// Iterator's reference type. 84 typedef typename base_type::reference reference; 85 86 /// Iterator's const reference type. 87 typedef typename base_type::const_reference const_reference; 88 89 inline 90 left_child_next_sibling_heap_const_iterator_(node_pointer p_nd) 91 : base_type(p_nd) 92 { } 93 94 /// Default constructor. 95 inline 96 left_child_next_sibling_heap_const_iterator_() 97 { } 98 99 /// Copy constructor. 100 inline 101 left_child_next_sibling_heap_const_iterator_(const PB_DS_CLASS_C_DEC& other) : base_type(other) 102 { } 103 104 /// Compares content to a different iterator object. 105 bool 106 operator==(const PB_DS_CLASS_C_DEC& other) const 107 { return (base_type::m_p_nd == other.m_p_nd); } 108 109 /// Compares content (negatively) to a different iterator object. 110 bool 111 operator!=(const PB_DS_CLASS_C_DEC& other) const 112 { return (base_type::m_p_nd != other.m_p_nd); } 113 114 PB_DS_CLASS_C_DEC& 115 operator++() 116 { 117 _GLIBCXX_DEBUG_ASSERT(base_type::m_p_nd != 0); 118 inc(); 119 return (*this); 120 } 121 122 PB_DS_CLASS_C_DEC 123 operator++(int) 124 { 125 PB_DS_CLASS_C_DEC ret_it(base_type::m_p_nd); 126 operator++(); 127 return (ret_it); 128 } 129 130 private: 131 void 132 inc() 133 { 134 if (base_type::m_p_nd->m_p_next_sibling != 0) 135 { 136 base_type::m_p_nd = base_type::m_p_nd->m_p_next_sibling; 137 while (base_type::m_p_nd->m_p_l_child != 0) 138 base_type::m_p_nd = base_type::m_p_nd->m_p_l_child; 139 return; 140 } 141 142 while (true) 143 { 144 node_pointer p_next = base_type::m_p_nd; 145 base_type::m_p_nd = base_type::m_p_nd->m_p_prev_or_parent; 146 if (base_type::m_p_nd == 0 147 || base_type::m_p_nd->m_p_l_child == p_next) 148 return; 149 } 150 } 151 }; 152 153 #undef PB_DS_CLASS_C_DEC 154 #undef PB_DS_BASIC_HEAP_CIT_BASE 155 156 } // namespace detail 157 } // namespace __gnu_pbds 158 159 #endif 160
