--- /dev/null
+// -*- C++ -*-
+
+// Copyright (C) 2005, 2006, 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 left_child_next_sibling_heap_/const_iterator.hpp
+ * Contains an iterator class returned by the table's const find and insert
+ * methods.
+ */
+
+#ifndef PB_DS_LEFT_CHILD_NEXT_SIBLING_HEAP_CONST_ITERATOR_HPP
+#define PB_DS_LEFT_CHILD_NEXT_SIBLING_HEAP_CONST_ITERATOR_HPP
+
+#include <ext/pb_ds/detail/left_child_next_sibling_heap_/point_const_iterator.hpp>
+#include <debug/debug.h>
+
+namespace __gnu_pbds
+{
+ namespace detail
+ {
+#define PB_DS_CLASS_C_DEC \
+ left_child_next_sibling_heap_const_iterator_<Node, _Alloc>
+
+#define PB_DS_BASIC_HEAP_CIT_BASE \
+ left_child_next_sibling_heap_node_point_const_iterator_<Node, _Alloc>
+
+ /// Const point-type iterator.
+ template<typename Node, typename _Alloc>
+ class left_child_next_sibling_heap_const_iterator_
+ : public PB_DS_BASIC_HEAP_CIT_BASE
+ {
+ private:
+ typedef PB_DS_BASIC_HEAP_CIT_BASE base_type;
+ typedef typename base_type::node_pointer node_pointer;
+
+ public:
+ /// Category.
+ typedef std::forward_iterator_tag iterator_category;
+
+ /// Difference type.
+ typedef typename _Alloc::difference_type difference_type;
+
+ /// Iterator's value type.
+ typedef typename base_type::value_type value_type;
+
+ /// Iterator's pointer type.
+ typedef typename base_type::pointer pointer;
+
+ /// Iterator's const pointer type.
+ typedef typename base_type::const_pointer const_pointer;
+
+ /// Iterator's reference type.
+ typedef typename base_type::reference reference;
+
+ /// Iterator's const reference type.
+ typedef typename base_type::const_reference const_reference;
+
+ inline
+ left_child_next_sibling_heap_const_iterator_(node_pointer p_nd)
+ : base_type(p_nd)
+ { }
+
+ /// Default constructor.
+ inline
+ left_child_next_sibling_heap_const_iterator_()
+ { }
+
+ /// Copy constructor.
+ inline
+ left_child_next_sibling_heap_const_iterator_(const PB_DS_CLASS_C_DEC& other) : base_type(other)
+ { }
+
+ /// Compares content to a different iterator object.
+ bool
+ operator==(const PB_DS_CLASS_C_DEC& other) const
+ { return (base_type::m_p_nd == other.m_p_nd); }
+
+ /// Compares content (negatively) to a different iterator object.
+ bool
+ operator!=(const PB_DS_CLASS_C_DEC& other) const
+ { return (base_type::m_p_nd != other.m_p_nd); }
+
+ PB_DS_CLASS_C_DEC&
+ operator++()
+ {
+ _GLIBCXX_DEBUG_ASSERT(base_type::m_p_nd != 0);
+ inc();
+ return (*this);
+ }
+
+ PB_DS_CLASS_C_DEC
+ operator++(int)
+ {
+ PB_DS_CLASS_C_DEC ret_it(base_type::m_p_nd);
+ operator++();
+ return (ret_it);
+ }
+
+ private:
+ void
+ inc()
+ {
+ if (base_type::m_p_nd->m_p_next_sibling != 0)
+ {
+ base_type::m_p_nd = base_type::m_p_nd->m_p_next_sibling;
+ while (base_type::m_p_nd->m_p_l_child != 0)
+ base_type::m_p_nd = base_type::m_p_nd->m_p_l_child;
+ return;
+ }
+
+ while (true)
+ {
+ node_pointer p_next = base_type::m_p_nd;
+ base_type::m_p_nd = base_type::m_p_nd->m_p_prev_or_parent;
+ if (base_type::m_p_nd == 0
+ || base_type::m_p_nd->m_p_l_child == p_next)
+ return;
+ }
+ }
+ };
+
+#undef PB_DS_CLASS_C_DEC
+#undef PB_DS_BASIC_HEAP_CIT_BASE
+
+ } // namespace detail
+} // namespace __gnu_pbds
+
+#endif
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