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diff --git a/libstdc++-v3/include/ext/pb_ds/detail/list_update_policy/counter_lu_metadata.hpp b/libstdc++-v3/include/ext/pb_ds/detail/list_update_policy/counter_lu_metadata.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 counter_lu_metadata.hpp
+ * Contains implementation of a lu counter policy's metadata.
+ */
+
+namespace __gnu_pbds
+{
+  namespace detail
+  {
+    template<typename Size_Type>
+    class counter_lu_policy_base;
+
+    // A list-update metadata type that moves elements to the front of
+    // the list based on the counter algorithm.
+    template<typename Size_Type = size_t>
+    class counter_lu_metadata
+    {
+    public:
+      typedef Size_Type size_type;
+
+    private:
+      counter_lu_metadata(size_type init_count) : m_count(init_count)
+      { }
+
+      friend class counter_lu_policy_base<size_type>;
+
+      mutable size_type m_count;
+    };
+
+    template<typename Size_Type>
+    class counter_lu_policy_base
+    {
+    protected:
+      typedef Size_Type size_type;
+
+      counter_lu_metadata<size_type>
+      operator()(size_type max_size) const
+      { return counter_lu_metadata<Size_Type>(std::rand() % max_size); }
+
+      template<typename Metadata_Reference>
+      bool
+      operator()(Metadata_Reference r_data, size_type m_max_count) const
+      {
+	if (++r_data.m_count != m_max_count)
+	  return false;
+	r_data.m_count = 0;
+	return true;
+      }
+    };
+  } // namespace detail
+} // namespace __gnu_pbds