Edit File: point_iterators.hpp
// -*- C++ -*- // Copyright (C) 2005-2018 Free Software Foundation, Inc. // // This file is part of the GNU ISO C++ Library. This library is free // software; you can redistribute it and/or modify it under the terms // of the GNU General Public License as published by the Free Software // Foundation; either version 3, or (at your option) any later // version. // This library is distributed in the hope that it will be useful, but // WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU // General Public License for more details. // Under Section 7 of GPL version 3, you are granted additional // permissions described in the GCC Runtime Library Exception, version // 3.1, as published by the Free Software Foundation. // You should have received a copy of the GNU General Public License and // a copy of the GCC Runtime Library Exception along with this program; // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see // <http://www.gnu.org/licenses/>. // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL. // Permission to use, copy, modify, sell, and distribute this software // is hereby granted without fee, provided that the above copyright // notice appears in all copies, and that both that copyright notice // and this permission notice appear in supporting documentation. None // of the above authors, nor IBM Haifa Research Laboratories, make any // representation about the suitability of this software for any // purpose. It is provided "as is" without express or implied // warranty. /** * @file bin_search_tree_/point_iterators.hpp * Contains an implementation class for bin_search_tree_. */ #ifndef PB_DS_BIN_SEARCH_TREE_FIND_ITERATORS_HPP #define PB_DS_BIN_SEARCH_TREE_FIND_ITERATORS_HPP #include <ext/pb_ds/tag_and_trait.hpp> #include <debug/debug.h> namespace __gnu_pbds { namespace detail { #define PB_DS_TREE_CONST_IT_C_DEC \ bin_search_tree_const_it_< \ Node_Pointer, \ Value_Type, \ Pointer, \ Const_Pointer, \ Reference, \ Const_Reference, \ Is_Forward_Iterator, \ _Alloc> #define PB_DS_TREE_CONST_ODIR_IT_C_DEC \ bin_search_tree_const_it_< \ Node_Pointer, \ Value_Type, \ Pointer, \ Const_Pointer, \ Reference, \ Const_Reference, \ !Is_Forward_Iterator, \ _Alloc> #define PB_DS_TREE_IT_C_DEC \ bin_search_tree_it_< \ Node_Pointer, \ Value_Type, \ Pointer, \ Const_Pointer, \ Reference, \ Const_Reference, \ Is_Forward_Iterator, \ _Alloc> #define PB_DS_TREE_ODIR_IT_C_DEC \ bin_search_tree_it_< \ Node_Pointer, \ Value_Type, \ Pointer, \ Const_Pointer, \ Reference, \ Const_Reference, \ !Is_Forward_Iterator, \ _Alloc> /// Const iterator. template<typename Node_Pointer, typename Value_Type, typename Pointer, typename Const_Pointer, typename Reference, typename Const_Reference, bool Is_Forward_Iterator, typename _Alloc> class bin_search_tree_const_it_ { public: typedef std::bidirectional_iterator_tag iterator_category; typedef typename _Alloc::difference_type difference_type; typedef Value_Type value_type; typedef Pointer pointer; typedef Const_Pointer const_pointer; typedef Reference reference; typedef Const_Reference const_reference; inline bin_search_tree_const_it_(const Node_Pointer p_nd = 0) : m_p_nd(const_cast<Node_Pointer>(p_nd)) { } inline bin_search_tree_const_it_(const PB_DS_TREE_CONST_ODIR_IT_C_DEC& other) : m_p_nd(other.m_p_nd) { } inline PB_DS_TREE_CONST_IT_C_DEC& operator=(const PB_DS_TREE_CONST_IT_C_DEC& other) { m_p_nd = other.m_p_nd; return *this; } inline PB_DS_TREE_CONST_IT_C_DEC& operator=(const PB_DS_TREE_CONST_ODIR_IT_C_DEC& other) { m_p_nd = other.m_p_nd; return *this; } inline const_pointer operator->() const { _GLIBCXX_DEBUG_ASSERT(m_p_nd != 0); return &m_p_nd->m_value; } inline const_reference operator*() const { _GLIBCXX_DEBUG_ASSERT(m_p_nd != 0); return m_p_nd->m_value; } inline bool operator==(const PB_DS_TREE_CONST_IT_C_DEC & other) const { return m_p_nd == other.m_p_nd; } inline bool operator==(const PB_DS_TREE_CONST_ODIR_IT_C_DEC & other) const { return m_p_nd == other.m_p_nd; } inline bool operator!=(const PB_DS_TREE_CONST_IT_C_DEC& other) const { return m_p_nd != other.m_p_nd; } inline bool operator!=(const PB_DS_TREE_CONST_ODIR_IT_C_DEC& other) const { return m_p_nd != other.m_p_nd; } inline PB_DS_TREE_CONST_IT_C_DEC& operator++() { _GLIBCXX_DEBUG_ASSERT(m_p_nd != 0); inc(integral_constant<int,Is_Forward_Iterator>()); return *this; } inline PB_DS_TREE_CONST_IT_C_DEC operator++(int) { PB_DS_TREE_CONST_IT_C_DEC ret_it(m_p_nd); operator++(); return ret_it; } inline PB_DS_TREE_CONST_IT_C_DEC& operator--() { dec(integral_constant<int,Is_Forward_Iterator>()); return *this; } inline PB_DS_TREE_CONST_IT_C_DEC operator--(int) { PB_DS_TREE_CONST_IT_C_DEC ret_it(m_p_nd); operator--(); return ret_it; } protected: inline void inc(false_type) { dec(true_type()); } void inc(true_type) { if (m_p_nd->special()&& m_p_nd->m_p_parent->m_p_parent == m_p_nd) { m_p_nd = m_p_nd->m_p_left; return; } if (m_p_nd->m_p_right != 0) { m_p_nd = m_p_nd->m_p_right; while (m_p_nd->m_p_left != 0) m_p_nd = m_p_nd->m_p_left; return; } Node_Pointer p_y = m_p_nd->m_p_parent; while (m_p_nd == p_y->m_p_right) { m_p_nd = p_y; p_y = p_y->m_p_parent; } if (m_p_nd->m_p_right != p_y) m_p_nd = p_y; } inline void dec(false_type) { inc(true_type()); } void dec(true_type) { if (m_p_nd->special() && m_p_nd->m_p_parent->m_p_parent == m_p_nd) { m_p_nd = m_p_nd->m_p_right; return; } if (m_p_nd->m_p_left != 0) { Node_Pointer p_y = m_p_nd->m_p_left; while (p_y->m_p_right != 0) p_y = p_y->m_p_right; m_p_nd = p_y; return; } Node_Pointer p_y = m_p_nd->m_p_parent; while (m_p_nd == p_y->m_p_left) { m_p_nd = p_y; p_y = p_y->m_p_parent; } if (m_p_nd->m_p_left != p_y) m_p_nd = p_y; } public: Node_Pointer m_p_nd; }; /// Iterator. template<typename Node_Pointer, typename Value_Type, typename Pointer, typename Const_Pointer, typename Reference, typename Const_Reference, bool Is_Forward_Iterator, typename _Alloc> class bin_search_tree_it_ : public PB_DS_TREE_CONST_IT_C_DEC { public: inline bin_search_tree_it_(const Node_Pointer p_nd = 0) : PB_DS_TREE_CONST_IT_C_DEC((Node_Pointer)p_nd) { } inline bin_search_tree_it_(const PB_DS_TREE_ODIR_IT_C_DEC& other) : PB_DS_TREE_CONST_IT_C_DEC(other.m_p_nd) { } inline PB_DS_TREE_IT_C_DEC& operator=(const PB_DS_TREE_IT_C_DEC& other) { base_it_type::m_p_nd = other.m_p_nd; return *this; } inline PB_DS_TREE_IT_C_DEC& operator=(const PB_DS_TREE_ODIR_IT_C_DEC& other) { base_it_type::m_p_nd = other.m_p_nd; return *this; } inline typename PB_DS_TREE_CONST_IT_C_DEC::pointer operator->() const { _GLIBCXX_DEBUG_ASSERT(base_it_type::m_p_nd != 0); return &base_it_type::m_p_nd->m_value; } inline typename PB_DS_TREE_CONST_IT_C_DEC::reference operator*() const { _GLIBCXX_DEBUG_ASSERT(base_it_type::m_p_nd != 0); return base_it_type::m_p_nd->m_value; } inline PB_DS_TREE_IT_C_DEC& operator++() { PB_DS_TREE_CONST_IT_C_DEC:: operator++(); return *this; } inline PB_DS_TREE_IT_C_DEC operator++(int) { PB_DS_TREE_IT_C_DEC ret_it(base_it_type::m_p_nd); operator++(); return ret_it; } inline PB_DS_TREE_IT_C_DEC& operator--() { PB_DS_TREE_CONST_IT_C_DEC:: operator--(); return *this; } inline PB_DS_TREE_IT_C_DEC operator--(int) { PB_DS_TREE_IT_C_DEC ret_it(base_it_type::m_p_nd); operator--(); return ret_it; } protected: typedef PB_DS_TREE_CONST_IT_C_DEC base_it_type; }; #undef PB_DS_TREE_CONST_IT_C_DEC #undef PB_DS_TREE_CONST_ODIR_IT_C_DEC #undef PB_DS_TREE_IT_C_DEC #undef PB_DS_TREE_ODIR_IT_C_DEC } // namespace detail } // namespace __gnu_pbds #endif
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