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diff --git a/libstdc++-v3/include/ext/pb_ds/detail/pat_trie_/const_child_iterator.hpp b/libstdc++-v3/include/ext/pb_ds/detail/pat_trie_/const_child_iterator.hpp
new file mode 100644
index 00000000..bc349cf2
--- /dev/null
+++ b/libstdc++-v3/include/ext/pb_ds/detail/pat_trie_/const_child_iterator.hpp
@@ -0,0 +1,111 @@
+// -*- 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 const_child_iterator.hpp
+ * Contains a const_iterator for a patricia tree.
+ */
+
+struct const_iterator
+{
+public:
+  typedef std::forward_iterator_tag iterator_category;
+
+  typedef typename Allocator::difference_type difference_type;
+
+  typedef node_pointer value_type;
+
+  typedef node_pointer_pointer pointer;
+
+  typedef node_pointer_reference reference;
+
+public:
+  inline
+  const_iterator(node_pointer_pointer p_p_cur = NULL,  
+		 node_pointer_pointer p_p_end = NULL) 
+  : m_p_p_cur(p_p_cur), m_p_p_end(p_p_end)
+  { }
+
+  inline bool
+  operator==(const const_iterator& other) const
+  { return m_p_p_cur == other.m_p_p_cur; }
+
+  inline bool
+  operator!=(const const_iterator& other) const
+  { return m_p_p_cur != other.m_p_p_cur; }
+
+  inline const_iterator& 
+  operator++()
+  {
+    do
+      ++m_p_p_cur;
+    while (m_p_p_cur != m_p_p_end&& * m_p_p_cur == NULL);
+    return *this;
+  }
+
+  inline const_iterator
+  operator++(int)
+  {
+    const_iterator ret_it(*this);
+    operator++();
+    return ret_it;
+  }
+
+  const node_pointer_pointer
+  operator->() const
+  {
+    _GLIBCXX_DEBUG_ONLY(assert_referencible();)
+    return (m_p_p_cur);
+  }
+
+  const_node_pointer
+  operator*() const
+  {
+    _GLIBCXX_DEBUG_ONLY(assert_referencible();)
+    return (*m_p_p_cur);
+  }
+
+protected:
+#ifdef _GLIBCXX_DEBUG
+  void
+  assert_referencible() const
+  { _GLIBCXX_DEBUG_ASSERT(m_p_p_cur != m_p_p_end&& * m_p_p_cur != NULL); }
+#endif 
+
+public:
+  node_pointer_pointer m_p_p_cur;
+  node_pointer_pointer m_p_p_end;
+};
+