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diff --git a/libstdc++-v3/include/ext/pb_ds/list_update_policy.hpp b/libstdc++-v3/include/ext/pb_ds/list_update_policy.hpp
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+// -*- C++ -*-
+
+// Copyright (C) 2005, 2006, 2007, 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 list_update_policy.hpp
+ * Contains policies for list update containers.
+ */
+
+#ifndef PB_DS_LU_POLICY_HPP
+#define PB_DS_LU_POLICY_HPP
+
+#include <cstdlib>
+#include <ext/pb_ds/detail/list_update_policy/counter_lu_metadata.hpp>
+
+namespace __gnu_pbds
+{
+  // A null type that means that each link in a list-based container
+  // does not actually need metadata.
+  struct null_lu_metadata
+  { };
+
+#define PB_DS_CLASS_T_DEC template<typename Allocator>
+#define PB_DS_CLASS_C_DEC move_to_front_lu_policy<Allocator>
+
+  // A list-update policy that unconditionally moves elements to the
+  // front of the list.
+  template<typename Allocator = std::allocator<char> >
+  class move_to_front_lu_policy
+  {
+  public:
+    typedef Allocator allocator_type;
+      
+    // Metadata on which this functor operates.
+    typedef null_lu_metadata metadata_type;
+      
+    // Reference to metadata on which this functor operates.
+    typedef typename allocator_type::template rebind<metadata_type>::other metadata_rebind;
+    typedef typename metadata_rebind::reference metadata_reference;
+      
+    // Creates a metadata object.
+    metadata_type
+    operator()() const;
+      
+    // Decides whether a metadata object should be moved to the front
+    // of the list.
+    inline bool
+    operator()(metadata_reference r_metadata) const;
+      
+  private:
+    static null_lu_metadata s_metadata;
+  };
+  
+#include <ext/pb_ds/detail/list_update_policy/mtf_lu_policy_imp.hpp>
+
+#undef PB_DS_CLASS_T_DEC
+#undef PB_DS_CLASS_C_DEC
+
+#define PB_DS_CLASS_T_DEC template<size_t Max_Count, class Allocator>
+#define PB_DS_CLASS_C_DEC counter_lu_policy<Max_Count, Allocator>
+
+  // A list-update policy that moves elements to the front of the list
+  // based on the counter algorithm.
+  template<size_t Max_Count = 5, typename Allocator = std::allocator<char> >
+  class counter_lu_policy 
+  : private detail::counter_lu_policy_base<typename Allocator::size_type>
+  {
+  public:
+    typedef Allocator allocator_type;
+
+    enum
+      {
+	max_count = Max_Count
+      };
+
+    typedef typename allocator_type::size_type size_type;
+
+    // Metadata on which this functor operates.
+    typedef detail::counter_lu_metadata<size_type> metadata_type;
+
+    // Reference to metadata on which this functor operates.
+    typedef typename Allocator::template rebind<metadata_type>::other metadata_rebind;
+    typedef typename metadata_rebind::reference metadata_reference;
+
+    // Creates a metadata object.
+    metadata_type
+    operator()() const;
+
+    // Decides whether a metadata object should be moved to the front
+    // of the list.
+    bool
+    operator()(metadata_reference r_metadata) const;
+
+  private:
+    typedef detail::counter_lu_policy_base<typename Allocator::size_type> base_type;
+  };
+
+#include <ext/pb_ds/detail/list_update_policy/counter_lu_policy_imp.hpp>
+
+#undef PB_DS_CLASS_T_DEC
+#undef PB_DS_CLASS_C_DEC
+
+} // namespace __gnu_pbds
+
+#endif