1 // -*- C++ -*- 2 3 // Copyright (C) 2005, 2006, 2009, 2010 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 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_/const_point_iterator.hpp> 46 #include <debug/debug.h> 47 48 namespace __gnu_pbds 49 { 50 namespace detail 51 { 52 53 #define PB_DS_CLASS_C_DEC \ 54 left_child_next_sibling_heap_const_iterator_<Node, Allocator> 55 56 #define PB_DS_BASE_C_DEC \ 57 left_child_next_sibling_heap_node_const_point_iterator_<Node, Allocator> 58 59 // Const point-type iterator. 60 template<typename Node, class Allocator> 61 class left_child_next_sibling_heap_const_iterator_ : public PB_DS_BASE_C_DEC 62 { 63 64 private: 65 typedef typename PB_DS_BASE_C_DEC::node_pointer node_pointer; 66 67 typedef PB_DS_BASE_C_DEC base_type; 68 69 public: 70 71 // Category. 72 typedef std::forward_iterator_tag iterator_category; 73 74 // Difference type. 75 typedef typename Allocator::difference_type difference_type; 76 77 // Iterator's value type. 78 typedef typename base_type::value_type value_type; 79 80 // Iterator's pointer type. 81 typedef typename base_type::pointer pointer; 82 83 // Iterator's const pointer type. 84 typedef typename base_type::const_pointer const_pointer; 85 86 // Iterator's reference type. 87 typedef typename base_type::reference reference; 88 89 // Iterator's const reference type. 90 typedef typename base_type::const_reference const_reference; 91 92 public: 93 94 inline 95 left_child_next_sibling_heap_const_iterator_(node_pointer p_nd) : base_type(p_nd) 96 { } 97 98 // Default constructor. 99 inline 100 left_child_next_sibling_heap_const_iterator_() 101 { } 102 103 // Copy constructor. 104 inline 105 left_child_next_sibling_heap_const_iterator_(const PB_DS_CLASS_C_DEC& other) : base_type(other) 106 { } 107 108 // Compares content to a different iterator object. 109 inline bool 110 operator==(const PB_DS_CLASS_C_DEC& other) const 111 { return (base_type::m_p_nd == other.m_p_nd); } 112 113 // Compares content (negatively) to a different iterator object. 114 inline bool 115 operator!=(const PB_DS_CLASS_C_DEC& other) const 116 { return (base_type::m_p_nd != other.m_p_nd); } 117 118 inline PB_DS_CLASS_C_DEC& 119 operator++() 120 { 121 _GLIBCXX_DEBUG_ASSERT(base_type::m_p_nd != 0); 122 inc(); 123 return (*this); 124 } 125 126 inline PB_DS_CLASS_C_DEC 127 operator++(int) 128 { 129 PB_DS_CLASS_C_DEC ret_it(base_type::m_p_nd); 130 operator++(); 131 return (ret_it); 132 } 133 134 private: 135 void 136 inc() 137 { 138 if (base_type::m_p_nd->m_p_next_sibling != 0) 139 { 140 base_type::m_p_nd = base_type::m_p_nd->m_p_next_sibling; 141 while (base_type::m_p_nd->m_p_l_child != 0) 142 base_type::m_p_nd = base_type::m_p_nd->m_p_l_child; 143 return; 144 } 145 146 while (true) 147 { 148 node_pointer p_next = base_type::m_p_nd; 149 base_type::m_p_nd = base_type::m_p_nd->m_p_prev_or_parent; 150 if (base_type::m_p_nd == 0 || base_type::m_p_nd->m_p_l_child == p_next) 151 return; 152 } 153 } 154 }; 155 156 #undef PB_DS_CLASS_C_DEC 157 #undef PB_DS_BASE_C_DEC 158 159 } // namespace detail 160 } // namespace __gnu_pbds 161 162 #endif 163
