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diff --git a/libstdc++-v3/include/ext/pb_ds/detail/pat_trie_/split_join_branch_bag.hpp b/libstdc++-v3/include/ext/pb_ds/detail/pat_trie_/split_join_branch_bag.hpp
new file mode 100644
index 00000000..9cecae51
--- /dev/null
+++ b/libstdc++-v3/include/ext/pb_ds/detail/pat_trie_/split_join_branch_bag.hpp
@@ -0,0 +1,93 @@
+// -*- C++ -*-
+
+// Copyright (C) 2005, 2006, 2007, 2008, 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 split_join_branch_bag.hpp
+ * Contains an implementation class for pat_trie_.
+ */
+
+class split_join_branch_bag
+{
+private:
+  typedef
+  std::list<
+  internal_node_pointer,
+  typename Allocator::template rebind<
+  internal_node_pointer>::other>
+  bag_t;
+
+public:
+
+  void
+  add_branch()
+  {
+    internal_node_pointer p_nd = s_internal_node_allocator.allocate(1);
+    __try
+      {
+	m_bag.push_back(p_nd);
+      }
+    __catch(...)
+      {
+	s_internal_node_allocator.deallocate(p_nd, 1);
+	__throw_exception_again;
+      }
+  }
+
+  internal_node_pointer
+  get_branch()
+  {
+    _GLIBCXX_DEBUG_ASSERT(!m_bag.empty());
+    internal_node_pointer p_nd =* m_bag.begin();
+    m_bag.pop_front();
+    return p_nd;
+  }
+
+  ~split_join_branch_bag()
+  {
+    while (!m_bag.empty())
+      {
+	internal_node_pointer p_nd =* m_bag.begin();
+	s_internal_node_allocator.deallocate(p_nd, 1);
+	m_bag.pop_front();
+      }
+  }
+
+  inline bool
+  empty() const
+  { return m_bag.empty(); }
+
+private:
+  bag_t m_bag;
+};