| // -*- C++ -*- |
| |
| // Copyright (C) 2005, 2006, 2007, 2009, 2010 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 node_iterators.hpp |
| * Contains an implementation class for ov_tree_. |
| */ |
| |
| #ifndef PB_DS_OV_TREE_NODE_ITERATORS_HPP |
| #define PB_DS_OV_TREE_NODE_ITERATORS_HPP |
| |
| #include <ext/pb_ds/tag_and_trait.hpp> |
| #include <ext/pb_ds/detail/type_utils.hpp> |
| #include <debug/debug.h> |
| |
| namespace __gnu_pbds |
| { |
| namespace detail |
| { |
| |
| #define PB_DS_OV_TREE_CONST_NODE_ITERATOR_C_DEC \ |
| ov_tree_node_const_it_<Value_Type, Metadata_Type, Allocator> |
| |
| // Const node reference. |
| template<typename Value_Type, typename Metadata_Type, class Allocator> |
| class ov_tree_node_const_it_ |
| { |
| |
| protected: |
| typedef |
| typename Allocator::template rebind< |
| Value_Type>::other::pointer |
| pointer; |
| |
| typedef |
| typename Allocator::template rebind< |
| Value_Type>::other::const_pointer |
| const_pointer; |
| |
| typedef |
| typename Allocator::template rebind< |
| Metadata_Type>::other::const_pointer |
| const_metadata_pointer; |
| |
| typedef PB_DS_OV_TREE_CONST_NODE_ITERATOR_C_DEC this_type; |
| |
| protected: |
| |
| template<typename Ptr> |
| inline static Ptr |
| mid_pointer(Ptr p_begin, Ptr p_end) |
| { |
| _GLIBCXX_DEBUG_ASSERT(p_end >= p_begin); |
| return (p_begin + (p_end - p_begin) / 2); |
| } |
| |
| public: |
| |
| typedef trivial_iterator_tag iterator_category; |
| |
| typedef trivial_iterator_difference_type difference_type; |
| |
| typedef |
| typename Allocator::template rebind< |
| Value_Type>::other::const_pointer |
| value_type; |
| |
| typedef |
| typename Allocator::template rebind< |
| typename remove_const< |
| Value_Type>::type>::other::const_pointer |
| reference; |
| |
| typedef |
| typename Allocator::template rebind< |
| typename remove_const< |
| Value_Type>::type>::other::const_pointer |
| const_reference; |
| |
| typedef Metadata_Type metadata_type; |
| |
| typedef |
| typename Allocator::template rebind< |
| metadata_type>::other::const_reference |
| const_metadata_reference; |
| |
| public: |
| inline |
| ov_tree_node_const_it_(const_pointer p_nd = 0, const_pointer p_begin_nd = 0, const_pointer p_end_nd = 0, const_metadata_pointer p_metadata = 0) : m_p_value(const_cast<pointer>(p_nd)), m_p_begin_value(const_cast<pointer>(p_begin_nd)), m_p_end_value(const_cast<pointer>(p_end_nd)), m_p_metadata(p_metadata) |
| { } |
| |
| inline const_reference |
| operator*() const |
| { return m_p_value; } |
| |
| inline const_metadata_reference |
| get_metadata() const |
| { |
| enum |
| { |
| has_metadata = !is_same<Metadata_Type, null_node_metadata>::value |
| }; |
| |
| PB_DS_STATIC_ASSERT(should_have_metadata, has_metadata); |
| _GLIBCXX_DEBUG_ASSERT(m_p_metadata != 0); |
| return *m_p_metadata; |
| } |
| |
| inline this_type |
| get_l_child() const |
| { |
| if (m_p_begin_value == m_p_value) |
| return (this_type(m_p_begin_value, m_p_begin_value, m_p_begin_value)); |
| |
| const_metadata_pointer p_begin_metadata = |
| m_p_metadata - (m_p_value - m_p_begin_value); |
| |
| return (this_type(mid_pointer(m_p_begin_value, m_p_value), |
| m_p_begin_value, |
| m_p_value, |
| mid_pointer(p_begin_metadata, m_p_metadata))); |
| } |
| |
| inline this_type |
| get_r_child() const |
| { |
| if (m_p_value == m_p_end_value) |
| return (this_type(m_p_end_value, m_p_end_value, m_p_end_value)); |
| |
| const_metadata_pointer p_end_metadata = |
| m_p_metadata + (m_p_end_value - m_p_value); |
| |
| return (this_type(mid_pointer(m_p_value + 1, m_p_end_value), |
| m_p_value + 1, |
| m_p_end_value,(m_p_metadata == 0) ? |
| 0 : mid_pointer(m_p_metadata + 1, p_end_metadata))); |
| } |
| |
| inline bool |
| operator==(const this_type& other) const |
| { |
| const bool is_end = m_p_begin_value == m_p_end_value; |
| const bool is_other_end = other.m_p_begin_value == other.m_p_end_value; |
| |
| if (is_end) |
| return (is_other_end); |
| |
| if (is_other_end) |
| return (is_end); |
| |
| return m_p_value == other.m_p_value; |
| } |
| |
| inline bool |
| operator!=(const this_type& other) const |
| { return !operator==(other); } |
| |
| public: |
| pointer m_p_value; |
| pointer m_p_begin_value; |
| pointer m_p_end_value; |
| |
| const_metadata_pointer m_p_metadata; |
| }; |
| |
| #define PB_DS_OV_TREE_NODE_ITERATOR_C_DEC \ |
| ov_tree_node_it_<Value_Type, Metadata_Type, Allocator> |
| |
| // Node reference. |
| template<typename Value_Type, typename Metadata_Type, class Allocator> |
| class ov_tree_node_it_ : public PB_DS_OV_TREE_CONST_NODE_ITERATOR_C_DEC |
| { |
| |
| private: |
| typedef PB_DS_OV_TREE_NODE_ITERATOR_C_DEC this_type; |
| |
| typedef PB_DS_OV_TREE_CONST_NODE_ITERATOR_C_DEC base_type; |
| |
| typedef typename base_type::pointer pointer; |
| |
| typedef typename base_type::const_pointer const_pointer; |
| |
| typedef |
| typename base_type::const_metadata_pointer |
| const_metadata_pointer; |
| |
| public: |
| |
| typedef trivial_iterator_tag iterator_category; |
| |
| typedef trivial_iterator_difference_type difference_type; |
| |
| typedef |
| typename Allocator::template rebind< |
| Value_Type>::other::pointer |
| value_type; |
| |
| typedef |
| typename Allocator::template rebind< |
| typename remove_const< |
| Value_Type>::type>::other::pointer |
| reference; |
| |
| typedef |
| typename Allocator::template rebind< |
| typename remove_const< |
| Value_Type>::type>::other::pointer |
| const_reference; |
| |
| public: |
| inline |
| ov_tree_node_it_(const_pointer p_nd = 0, const_pointer p_begin_nd = 0, const_pointer p_end_nd = 0, const_metadata_pointer p_metadata = 0) : base_type(p_nd, p_begin_nd, p_end_nd, p_metadata) |
| { } |
| |
| // Access. |
| inline reference |
| operator*() const |
| { return reference(base_type::m_p_value); } |
| |
| // Returns the node reference associated with the left node. |
| inline ov_tree_node_it_ |
| get_l_child() const |
| { |
| if (base_type::m_p_begin_value == base_type::m_p_value) |
| return (this_type(base_type::m_p_begin_value, base_type::m_p_begin_value, base_type::m_p_begin_value)); |
| |
| const_metadata_pointer p_begin_metadata = |
| base_type::m_p_metadata - (base_type::m_p_value - base_type::m_p_begin_value); |
| |
| return (this_type(base_type::mid_pointer(base_type::m_p_begin_value, base_type::m_p_value), |
| base_type::m_p_begin_value, |
| base_type::m_p_value, |
| base_type::mid_pointer(p_begin_metadata, base_type::m_p_metadata))); |
| } |
| |
| // Returns the node reference associated with the right node. |
| inline ov_tree_node_it_ |
| get_r_child() const |
| { |
| if (base_type::m_p_value == base_type::m_p_end_value) |
| return (this_type(base_type::m_p_end_value, base_type::m_p_end_value, base_type::m_p_end_value)); |
| |
| const_metadata_pointer p_end_metadata = |
| base_type::m_p_metadata + (base_type::m_p_end_value - base_type::m_p_value); |
| |
| return (this_type(base_type::mid_pointer(base_type::m_p_value + 1, base_type::m_p_end_value), |
| base_type::m_p_value + 1, |
| base_type::m_p_end_value,(base_type::m_p_metadata == 0)? |
| 0 : base_type::mid_pointer(base_type::m_p_metadata + 1, p_end_metadata))); |
| } |
| |
| }; |
| |
| #undef PB_DS_OV_TREE_NODE_ITERATOR_C_DEC |
| #undef PB_DS_OV_TREE_CONST_NODE_ITERATOR_C_DEC |
| |
| } // namespace detail |
| } // namespace __gnu_pbds |
| |
| #endif |
