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diff --git a/libstdc++-v3/include/ext/pb_ds/detail/pat_trie_/node_base.hpp b/libstdc++-v3/include/ext/pb_ds/detail/pat_trie_/node_base.hpp
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+++ b/libstdc++-v3/include/ext/pb_ds/detail/pat_trie_/node_base.hpp
@@ -0,0 +1,128 @@
+// -*- 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_base.hpp
+ * Contains a pat_trie_node_base base for a patricia tree.
+ */
+
+#ifndef PB_DS_PAT_TRIE_NODE_BASE_HPP
+#define PB_DS_PAT_TRIE_NODE_BASE_HPP
+
+#include <ext/pb_ds/detail/pat_trie_/node_metadata_base.hpp>
+
+namespace __gnu_pbds
+{
+  namespace detail
+  {
+#define PB_DS_CLASS_T_DEC \
+    template<typename Type_Traits, typename E_Access_Traits,	\
+	     typename Metadata,	typename Allocator>
+
+#define PB_DS_CLASS_C_DEC \
+    pat_trie_node_base<Type_Traits, E_Access_Traits, Metadata, Allocator>
+
+#define PB_DS_PAT_TRIE_SUBTREE_DEBUG_INFO_C_DEC	\
+    pat_trie_subtree_debug_info<Type_Traits, E_Access_Traits, Allocator>
+
+    enum pat_trie_node_type
+      {
+	pat_trie_internal_node_type,
+	pat_trie_leaf_node_type,
+	pat_trie_head_node_type
+      };
+
+    template<typename Type_Traits,
+	     typename E_Access_Traits,
+	     typename Metadata,
+	     typename Allocator>
+    struct pat_trie_node_base : public pat_trie_node_metadata_base<
+      Metadata,
+      Allocator>
+    {
+    public:
+      typedef
+      typename Allocator::template rebind<
+      pat_trie_node_base>::other::pointer
+      node_pointer;
+
+      typedef
+      typename Allocator::template rebind<
+	E_Access_Traits>::other::const_pointer
+      const_e_access_traits_pointer;
+
+#ifdef _GLIBCXX_DEBUG
+      typedef
+      std::pair<
+	typename E_Access_Traits::const_iterator,
+	typename E_Access_Traits::const_iterator>
+      subtree_debug_info;
+#endif 
+
+      pat_trie_node_base(pat_trie_node_type type);
+
+#ifdef _GLIBCXX_DEBUG
+      void
+      assert_valid(const_e_access_traits_pointer p_traits) const;
+
+      virtual subtree_debug_info
+      assert_valid_imp(const_e_access_traits_pointer p_traits) const = 0;
+#endif 
+
+      node_pointer m_p_parent;
+      const pat_trie_node_type m_type;
+    };
+
+    PB_DS_CLASS_T_DEC
+    PB_DS_CLASS_C_DEC::
+    pat_trie_node_base(pat_trie_node_type type) : m_type(type)
+    { }
+
+#ifdef _GLIBCXX_DEBUG
+    PB_DS_CLASS_T_DEC
+    void
+    PB_DS_CLASS_C_DEC::
+    assert_valid(const_e_access_traits_pointer p_traits) const
+    { assert_valid_imp(p_traits); }
+#endif 
+
+#undef PB_DS_CLASS_T_DEC
+#undef PB_DS_CLASS_C_DEC
+#undef PB_DS_PAT_TRIE_SUBTREE_DEBUG_INFO_C_DEC
+
+  } // namespace detail
+} // namespace __gnu_pbds
+
+#endif