--- /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 node_iterators.hpp
+ * Contains an implementation class for pat_trie_.
+ */
+
+#ifndef PB_DS_PAT_TRIE_NODE_ITERATORS_HPP
+#define PB_DS_PAT_TRIE_NODE_ITERATORS_HPP
+
+#include <debug/debug.h>
+
+namespace __gnu_pbds
+{
+ namespace detail
+ {
+
+#define PB_DS_PAT_TRIE_CONST_NODE_ITERATOR_C_DEC \
+ pat_trie_const_node_it_< \
+ Node, \
+ Leaf, \
+ Head, \
+ Internal_Node, \
+ Const_Iterator, \
+ Iterator, \
+ E_Access_Traits, \
+ Allocator>
+
+#define PB_DS_PAT_TRIE_NODE_ITERATOR_C_DEC \
+ pat_trie_node_it_< \
+ Node, \
+ Leaf, \
+ Head, \
+ Internal_Node, \
+ Const_Iterator, \
+ Iterator, \
+ E_Access_Traits, \
+ Allocator>
+
+ // Const node iterator.
+ template<typename Node,
+ class Leaf,
+ class Head,
+ class Internal_Node,
+ class Const_Iterator,
+ class Iterator,
+ class E_Access_Traits,
+ class Allocator>
+ class pat_trie_const_node_it_
+ {
+ protected:
+ 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<
+ Internal_Node>::other::pointer
+ internal_node_pointer;
+
+ typedef
+ typename Allocator::template rebind<
+ Internal_Node>::other::const_pointer
+ const_internal_node_pointer;
+
+ typedef
+ typename Allocator::template rebind<
+ E_Access_Traits>::other::const_pointer
+ const_e_access_traits_pointer;
+
+ private:
+ inline typename E_Access_Traits::const_iterator
+ pref_begin() const
+ {
+ if (m_p_nd->m_type == pat_trie_leaf_node_type)
+ return (m_p_traits->begin(
+ m_p_traits->extract_key(
+ static_cast<const_leaf_pointer>(m_p_nd)->value())));
+
+ _GLIBCXX_DEBUG_ASSERT(m_p_nd->m_type == pat_trie_internal_node_type);
+
+ return (static_cast<const_internal_node_pointer>(m_p_nd)->pref_b_it());
+ }
+
+ inline typename E_Access_Traits::const_iterator
+ pref_end() const
+ {
+ if (m_p_nd->m_type == pat_trie_leaf_node_type)
+ return (m_p_traits->end(
+ m_p_traits->extract_key(
+ static_cast<const_leaf_pointer>(m_p_nd)->value())));
+
+ _GLIBCXX_DEBUG_ASSERT(m_p_nd->m_type == pat_trie_internal_node_type);
+
+ return (static_cast<const_internal_node_pointer>(m_p_nd)->pref_e_it());
+ }
+
+ public:
+
+ // Size type.
+ typedef typename Allocator::size_type size_type;
+
+ // Category.
+ typedef trivial_iterator_tag iterator_category;
+
+ // Difference type.
+ typedef trivial_iterator_difference_type difference_type;
+
+ // __Iterator's value type.
+ typedef Const_Iterator value_type;
+
+ // __Iterator's reference type.
+ typedef value_type reference;
+
+ // __Iterator's __const reference type.
+ typedef value_type const_reference;
+
+ // Element access traits.
+ typedef E_Access_Traits e_access_traits;
+
+ // A key's element __const iterator.
+ typedef typename e_access_traits::const_iterator const_e_iterator;
+
+ // Metadata type.
+ typedef typename Node::metadata_type metadata_type;
+
+ // Const metadata reference type.
+ typedef
+ typename Allocator::template rebind<
+ metadata_type>::other::const_reference
+ const_metadata_reference;
+
+ // Default constructor.
+ /*
+ inline
+ pat_trie_const_node_it_()
+ */
+ inline
+ pat_trie_const_node_it_(node_pointer p_nd = NULL,
+ const_e_access_traits_pointer p_traits = NULL)
+ : m_p_nd(const_cast<node_pointer>(p_nd)), m_p_traits(p_traits)
+ { }
+
+ // Subtree valid prefix.
+ inline std::pair<const_e_iterator, const_e_iterator>
+ valid_prefix() const
+ { return std::make_pair(pref_begin(), pref_end()); }
+
+ // Const access; returns the __const iterator* associated with
+ // the current leaf.
+ inline const_reference
+ operator*() const
+ {
+ _GLIBCXX_DEBUG_ASSERT(num_children() == 0);
+ return Const_Iterator(m_p_nd);
+ }
+
+ // Metadata access.
+ inline const_metadata_reference
+ get_metadata() const
+ { return m_p_nd->get_metadata(); }
+
+ // Returns the number of children in the corresponding node.
+ inline size_type
+ num_children() const
+ {
+ if (m_p_nd->m_type == pat_trie_leaf_node_type)
+ return 0;
+ _GLIBCXX_DEBUG_ASSERT(m_p_nd->m_type == pat_trie_internal_node_type);
+ return std::distance(static_cast<internal_node_pointer>(m_p_nd)->begin(), static_cast<internal_node_pointer>(m_p_nd)->end());
+ }
+
+ // Returns a __const node __iterator to the corresponding node's
+ // i-th child.
+ PB_DS_PAT_TRIE_CONST_NODE_ITERATOR_C_DEC
+ get_child(size_type i) const
+ {
+ _GLIBCXX_DEBUG_ASSERT(m_p_nd->m_type == pat_trie_internal_node_type);
+ typename Internal_Node::iterator it =
+ static_cast<internal_node_pointer>(m_p_nd)->begin();
+
+ std::advance(it, i);
+ return PB_DS_PAT_TRIE_CONST_NODE_ITERATOR_C_DEC(*it, m_p_traits);
+ }
+
+ // Compares content to a different iterator object.
+ inline bool
+ operator==(const PB_DS_PAT_TRIE_CONST_NODE_ITERATOR_C_DEC& other) const
+ { return (m_p_nd == other.m_p_nd); }
+
+ // Compares content (negatively) to a different iterator object.
+ inline bool
+ operator!=(const PB_DS_PAT_TRIE_CONST_NODE_ITERATOR_C_DEC& other) const
+ { return m_p_nd != other.m_p_nd; }
+
+ private:
+
+ friend class PB_DS_CLASS_C_DEC;
+
+ public:
+ node_pointer m_p_nd;
+
+ const_e_access_traits_pointer m_p_traits;
+ };
+
+ // Node iterator.
+ template<typename Node,
+ class Leaf,
+ class Head,
+ class Internal_Node,
+ class Const_Iterator,
+ class Iterator,
+ class E_Access_Traits,
+ class Allocator>
+ class pat_trie_node_it_ :
+ public PB_DS_PAT_TRIE_CONST_NODE_ITERATOR_C_DEC
+
+ {
+ private:
+ typedef
+ typename Allocator::template rebind<
+ Node>::other::pointer
+ node_pointer;
+
+ typedef Iterator iterator;
+
+ typedef PB_DS_PAT_TRIE_CONST_NODE_ITERATOR_C_DEC base_type;
+
+ typedef
+ typename base_type::const_e_access_traits_pointer
+ const_e_access_traits_pointer;
+
+ typedef typename base_type::internal_node_pointer internal_node_pointer;
+
+ public:
+
+ // Size type.
+ typedef
+ typename PB_DS_PAT_TRIE_CONST_NODE_ITERATOR_C_DEC::size_type
+ size_type;
+
+ // __Iterator's value type.
+ typedef Iterator value_type;
+
+ // __Iterator's reference type.
+ typedef value_type reference;
+
+ // __Iterator's __const reference type.
+ typedef value_type const_reference;
+
+ // Default constructor.
+ /*
+ inline
+ pat_trie_node_it_() ;
+ */
+
+ inline
+ pat_trie_node_it_(node_pointer p_nd = NULL, const_e_access_traits_pointer p_traits = NULL) : base_type(p_nd, p_traits)
+ { }
+
+ // Access; returns the iterator* associated with the current leaf.
+ inline reference
+ operator*() const
+ {
+ _GLIBCXX_DEBUG_ASSERT(base_type::num_children() == 0);
+ return Iterator(base_type::m_p_nd);
+
+ }
+
+ // Returns a node __iterator to the corresponding node's i-th child.
+ PB_DS_PAT_TRIE_NODE_ITERATOR_C_DEC
+ get_child(size_type i) const
+ {
+ _GLIBCXX_DEBUG_ASSERT(base_type::m_p_nd->m_type == pat_trie_internal_node_type);
+
+ typename Internal_Node::iterator it =
+ static_cast<internal_node_pointer>(base_type::m_p_nd)->begin();
+
+ std::advance(it, i);
+ return PB_DS_PAT_TRIE_NODE_ITERATOR_C_DEC(*it, base_type::m_p_traits);
+ }
+
+ private:
+ friend class PB_DS_CLASS_C_DEC;
+ };
+
+#undef PB_DS_PAT_TRIE_CONST_NODE_ITERATOR_C_DEC
+#undef PB_DS_PAT_TRIE_NODE_ITERATOR_C_DEC
+
+ } // namespace detail
+} // namespace __gnu_pbds
+
+#endif
+
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