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diff --git a/libstdc++-v3/testsuite/util/rng/twister_rand_gen.hpp b/libstdc++-v3/testsuite/util/rng/twister_rand_gen.hpp
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+// -*- C++ -*-
+
+// Copyright (C) 2005, 2006 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 2, 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.
+
+// You should have received a copy of the GNU General Public License
+// along with this library; see the file COPYING.  If not, write to
+// the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
+// MA 02111-1307, USA.
+
+// As a special exception, you may use this file as part of a free
+// software library without restriction.  Specifically, if other files
+// instantiate templates or use macros or inline functions from this
+// file, or you compile this file and link it with other files to
+// produce an executable, this file does not by itself cause the
+// resulting executable to be covered by the GNU General Public
+// License.  This exception does not however invalidate any other
+// reasons why the executable file might be covered by the GNU General
+// Public License.
+
+// 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 twister_rand_gen.hpp
+ * Contains a random number generator invented and implemented by
+ *    Makoto Matsumoto
+ *    (http://www.math.sci.hiroshima-u.ac.jp/~m-mat/MT/emt.html)
+ */
+
+#ifndef PB_DS_TWISTER_RAND_GEN_HPP
+#define PB_DS_TWISTER_RAND_GEN_HPP
+
+#include <ctime>
+#include <limits.h>
+
+namespace pb_ds
+{
+  namespace test
+  {
+    class twister_rand_gen
+    {
+    private:
+      enum
+	{
+	  mers_n = 624,
+	  mers_m = 397,
+	  mers_r = 31,
+	  mers_u = 11,
+	  mers_s = 7,
+	  mers_t = 15,
+	  mers_l = 18,
+	  mers_a = 0x9908B0DF,
+	  mers_b = 0x9D2C5680,
+	  mers_c = 0xEFC60000
+	};
+
+      unsigned long m_a_mt[mers_n];
+      unsigned long m_mti;
+
+      enum endianess_type
+	{
+	  little,
+	  big,
+	  none
+	};
+
+      endianess_type m_endianess;
+
+      unsigned long
+      get_unsigned_long_imp();
+
+    public:
+      twister_rand_gen(unsigned long seed = static_cast<unsigned long>(std::time(0)));
+
+      void
+      init(unsigned long seed);
+
+      static unsigned long
+      get_time_determined_seed()
+      { return (static_cast<unsigned long>(std::time(0))); }
+
+      unsigned long
+      get_unsigned_long(unsigned long min = 0, unsigned long max = UINT_MAX - 1);
+
+      double
+      get_prob();
+    };
+  } // namespace test
+} // namespace pb_ds
+
+#endif // #ifndef PB_DS_TWISTER_RAND_GEN_HPP