--- /dev/null
+// -*- C++ -*-
+
+// Copyright (C) 2005, 2006, 2009 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 point_iterators.hpp
+ * Contains an implementation class for bin_search_tree_.
+ */
+
+#ifndef PB_DS_PAT_TRIE_FIND_ITERATORS_HPP
+#define PB_DS_PAT_TRIE_FIND_ITERATORS_HPP
+
+#include <debug/debug.h>
+
+namespace __gnu_pbds
+{
+ namespace detail
+ {
+
+#define PB_DS_CONST_IT_C_DEC \
+ pat_trie_const_it_< \
+ Type_Traits, \
+ Node, \
+ Leaf, \
+ Head, \
+ Internal_Node, \
+ Is_Forward_Iterator, \
+ Allocator>
+
+#define PB_DS_CONST_ODIR_IT_C_DEC \
+ pat_trie_const_it_< \
+ Type_Traits, \
+ Node, \
+ Leaf, \
+ Head, \
+ Internal_Node, \
+ !Is_Forward_Iterator, \
+ Allocator>
+
+#define PB_DS_IT_C_DEC \
+ pat_trie_it_< \
+ Type_Traits, \
+ Node, \
+ Leaf, \
+ Head, \
+ Internal_Node, \
+ Is_Forward_Iterator, \
+ Allocator>
+
+#define PB_DS_ODIR_IT_C_DEC \
+ pat_trie_it_< \
+ Type_Traits, \
+ Node, \
+ Leaf, \
+ Head, \
+ Internal_Node, \
+ !Is_Forward_Iterator, \
+ Allocator>
+
+
+ // Const iterator.
+ template<typename Type_Traits,
+ class Node,
+ class Leaf,
+ class Head,
+ class Internal_Node,
+ bool Is_Forward_Iterator,
+ class Allocator>
+ class pat_trie_const_it_
+ {
+
+ private:
+ typedef
+ typename Allocator::template rebind<
+ Node>::other::pointer
+ node_pointer;
+
+ typedef
+ typename Allocator::template rebind<
+ Leaf>::other::const_pointer
+ const_leaf_pointer;
+
+ typedef
+ typename Allocator::template rebind<
+ Leaf>::other::pointer
+ leaf_pointer;
+
+ typedef
+ typename Allocator::template rebind<
+ Head>::other::pointer
+ head_pointer;
+
+ typedef
+ typename Allocator::template rebind<
+ Internal_Node>::other::pointer
+ internal_node_pointer;
+
+ public:
+
+ typedef std::bidirectional_iterator_tag iterator_category;
+
+ typedef typename Allocator::difference_type difference_type;
+
+ typedef typename Type_Traits::value_type value_type;
+
+ typedef typename Type_Traits::pointer pointer;
+
+ typedef typename Type_Traits::const_pointer const_pointer;
+
+ typedef typename Type_Traits::reference reference;
+
+ typedef typename Type_Traits::const_reference const_reference;
+
+ public:
+
+ inline
+ pat_trie_const_it_(node_pointer p_nd = NULL) : m_p_nd(p_nd)
+ { }
+
+ inline
+ pat_trie_const_it_(const PB_DS_CONST_ODIR_IT_C_DEC& other)
+ : m_p_nd(other.m_p_nd)
+ { }
+
+ inline
+ PB_DS_CONST_IT_C_DEC&
+ operator=(const PB_DS_CONST_IT_C_DEC& other)
+ {
+ m_p_nd = other.m_p_nd;
+ return *this;
+ }
+
+ inline
+ PB_DS_CONST_IT_C_DEC&
+ operator=(const PB_DS_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->m_type == pat_trie_leaf_node_type);
+ return &static_cast<leaf_pointer>(m_p_nd)->value();
+ }
+
+ inline const_reference
+ operator*() const
+ {
+ _GLIBCXX_DEBUG_ASSERT(m_p_nd->m_type == pat_trie_leaf_node_type);
+ return static_cast<leaf_pointer>(m_p_nd)->value();
+ }
+
+ inline bool
+ operator==(const PB_DS_CONST_IT_C_DEC& other) const
+ { return (m_p_nd == other.m_p_nd); }
+
+ inline bool
+ operator==(const PB_DS_CONST_ODIR_IT_C_DEC& other) const
+ { return (m_p_nd == other.m_p_nd); }
+
+ inline bool
+ operator!=(const PB_DS_CONST_IT_C_DEC& other) const
+ { return (m_p_nd != other.m_p_nd); }
+
+ inline bool
+ operator!=(const PB_DS_CONST_ODIR_IT_C_DEC& other) const
+ { return (m_p_nd != other.m_p_nd); }
+
+ inline PB_DS_CONST_IT_C_DEC&
+ operator++()
+ {
+ inc(integral_constant<int,Is_Forward_Iterator>());
+ return *this;
+ }
+
+ inline PB_DS_CONST_IT_C_DEC
+ operator++(int)
+ {
+ PB_DS_CONST_IT_C_DEC ret_it(m_p_nd);
+ operator++();
+ return ret_it;
+ }
+
+ inline PB_DS_CONST_IT_C_DEC&
+ operator--()
+ {
+ dec(integral_constant<int,Is_Forward_Iterator>());
+ return *this;
+ }
+
+ inline PB_DS_CONST_IT_C_DEC
+ operator--(int)
+ {
+ PB_DS_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->m_type == pat_trie_head_node_type)
+ {
+ m_p_nd = static_cast<head_pointer>(m_p_nd)->m_p_min;
+ return;
+ }
+
+ node_pointer p_y = m_p_nd->m_p_parent;
+ while (p_y->m_type != pat_trie_head_node_type &&
+ get_larger_sibling(m_p_nd) == NULL)
+ {
+ m_p_nd = p_y;
+ p_y = p_y->m_p_parent;
+ }
+
+ if (p_y->m_type == pat_trie_head_node_type)
+ {
+ m_p_nd = p_y;
+ return;
+ }
+ m_p_nd = leftmost_descendant(get_larger_sibling(m_p_nd));
+ }
+
+ inline void
+ dec(false_type)
+ { inc(true_type()); }
+
+ void
+ dec(true_type)
+ {
+ if (m_p_nd->m_type == pat_trie_head_node_type)
+ {
+ m_p_nd = static_cast<head_pointer>(m_p_nd)->m_p_max;
+ return;
+ }
+
+ node_pointer p_y = m_p_nd->m_p_parent;
+ while (p_y->m_type != pat_trie_head_node_type &&
+ get_smaller_sibling(m_p_nd) == NULL)
+ {
+ m_p_nd = p_y;
+ p_y = p_y->m_p_parent;
+ }
+
+ if (p_y->m_type == pat_trie_head_node_type)
+ {
+ m_p_nd = p_y;
+ return;
+ }
+ m_p_nd = rightmost_descendant(get_smaller_sibling(m_p_nd));
+ }
+
+ inline static node_pointer
+ get_larger_sibling(node_pointer p_nd)
+ {
+ internal_node_pointer p_parent =
+ static_cast<internal_node_pointer>(p_nd->m_p_parent);
+
+ typename Internal_Node::iterator it = p_parent->begin();
+ while (*it != p_nd)
+ ++it;
+
+ typename Internal_Node::iterator next_it = it;
+ ++next_it;
+ return ((next_it == p_parent->end())? NULL :* next_it);
+ }
+
+ inline static node_pointer
+ get_smaller_sibling(node_pointer p_nd)
+ {
+ internal_node_pointer p_parent =
+ static_cast<internal_node_pointer>(p_nd->m_p_parent);
+
+ typename Internal_Node::iterator it = p_parent->begin();
+
+ if (*it == p_nd)
+ return (NULL);
+ typename Internal_Node::iterator prev_it;
+ do
+ {
+ prev_it = it;
+ ++it;
+ if (*it == p_nd)
+ return (*prev_it);
+ }
+ while (true);
+
+ _GLIBCXX_DEBUG_ASSERT(false);
+ return (NULL);
+ }
+
+ inline static leaf_pointer
+ leftmost_descendant(node_pointer p_nd)
+ {
+ if (p_nd->m_type == pat_trie_leaf_node_type)
+ return static_cast<leaf_pointer>(p_nd);
+ return static_cast<internal_node_pointer>(p_nd)->leftmost_descendant();
+ }
+
+ inline static leaf_pointer
+ rightmost_descendant(node_pointer p_nd)
+ {
+ if (p_nd->m_type == pat_trie_leaf_node_type)
+ return static_cast<leaf_pointer>(p_nd);
+ return static_cast<internal_node_pointer>(p_nd)->rightmost_descendant();
+ }
+
+ public:
+ node_pointer m_p_nd;
+ };
+
+ // Iterator.
+ template<typename Type_Traits,
+ class Node,
+ class Leaf,
+ class Head,
+ class Internal_Node,
+ bool Is_Forward_Iterator,
+ class Allocator>
+ class pat_trie_it_ :
+ public PB_DS_CONST_IT_C_DEC
+
+ {
+ private:
+ typedef
+ typename Allocator::template rebind<
+ Node>::other::pointer
+ node_pointer;
+
+ typedef
+ typename Allocator::template rebind<
+ Leaf>::other::const_pointer
+ const_leaf_pointer;
+
+ typedef
+ typename Allocator::template rebind<
+ Leaf>::other::pointer
+ leaf_pointer;
+
+ typedef
+ typename Allocator::template rebind<
+ Head>::other::pointer
+ head_pointer;
+
+ typedef
+ typename Allocator::template rebind<
+ Internal_Node>::other::pointer
+ internal_node_pointer;
+
+ public:
+ typedef typename Type_Traits::value_type value_type;
+
+ typedef typename Type_Traits::const_pointer const_pointer;
+
+ typedef typename Type_Traits::pointer pointer;
+
+ typedef typename Type_Traits::const_reference const_reference;
+
+ typedef typename Type_Traits::reference reference;
+
+ inline
+ pat_trie_it_(node_pointer p_nd = NULL) : PB_DS_CONST_IT_C_DEC((node_pointer)p_nd)
+ { }
+
+ inline
+ pat_trie_it_(const PB_DS_ODIR_IT_C_DEC& other) : PB_DS_CONST_IT_C_DEC(other.m_p_nd)
+ { }
+
+ inline
+ PB_DS_IT_C_DEC&
+ operator=(const PB_DS_IT_C_DEC& other)
+ {
+ base_it_type::m_p_nd = other.m_p_nd;
+ return *this;
+ }
+
+ inline
+ PB_DS_IT_C_DEC&
+ operator=(const PB_DS_ODIR_IT_C_DEC& other)
+ {
+ base_it_type::m_p_nd = other.m_p_nd;
+ return *this;
+ }
+
+ inline pointer
+ operator->() const
+ {
+ _GLIBCXX_DEBUG_ASSERT(base_it_type::m_p_nd->m_type == pat_trie_leaf_node_type);
+
+ return &static_cast<leaf_pointer>(base_it_type::m_p_nd)->value();
+ }
+
+ inline reference
+ operator*() const
+ {
+ _GLIBCXX_DEBUG_ASSERT(base_it_type::m_p_nd->m_type == pat_trie_leaf_node_type);
+ return static_cast<leaf_pointer>(base_it_type::m_p_nd)->value();
+ }
+
+ inline PB_DS_IT_C_DEC&
+ operator++()
+ {
+ PB_DS_CONST_IT_C_DEC::
+ operator++();
+ return *this;
+ }
+
+ inline PB_DS_IT_C_DEC
+ operator++(int)
+ {
+ PB_DS_IT_C_DEC ret_it(base_it_type::m_p_nd);
+ operator++();
+ return ret_it;
+ }
+
+ inline PB_DS_IT_C_DEC&
+ operator--()
+ {
+ PB_DS_CONST_IT_C_DEC::operator--();
+ return *this;
+ }
+
+ inline PB_DS_IT_C_DEC
+ operator--(int)
+ {
+ PB_DS_IT_C_DEC ret_it(base_it_type::m_p_nd);
+ operator--();
+ return ret_it;
+ }
+
+ protected:
+ typedef PB_DS_CONST_IT_C_DEC base_it_type;
+
+ friend class PB_DS_CLASS_C_DEC;
+ };
+
+#undef PB_DS_CONST_IT_C_DEC
+#undef PB_DS_CONST_ODIR_IT_C_DEC
+#undef PB_DS_IT_C_DEC
+#undef PB_DS_ODIR_IT_C_DEC
+
+ } // namespace detail
+} // namespace __gnu_pbds
+
+#endif
+
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