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diff --git a/libstdc++-v3/testsuite/util/statistic/result_recorder.hpp b/libstdc++-v3/testsuite/util/statistic/result_recorder.hpp
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+// -*- 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.
+
+// You should have received a copy of the GNU General Public License
+// along with this library; see the file COPYING3.  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 result_recorder.hpp
+ * Contains a class for recording results
+ */
+
+#ifndef PB_DS_RES_RECORDER_HPP
+#define PB_DS_RES_RECORDER_HPP
+
+#include <statistic/sample_mean.hpp>
+#include <statistic/sample_variance.hpp>
+#include <statistic/sample_mean_confidence_checker.hpp>
+
+namespace __gnu_pbds
+{
+  namespace test
+  {
+    namespace detail
+    {
+      /*
+       * Records results until the probability that the sample mean is 10% away
+       * from the true mean is ~ 0.05.
+       */
+      template<typename Value_Type>
+      class result_recorder
+      {
+      public:
+	typedef Value_Type value_type;
+
+	result_recorder()
+        : m_sample_mean(value_type()), m_sample_var(value_type())
+	{ }
+
+	bool
+        add_result(value_type res);
+
+	inline value_type
+        get_sample_mean() const
+	{ return m_sample_mean; }
+
+      private:
+	typedef std::list<value_type> list_type;
+
+	list_type m_l;
+	value_type m_sample_mean;
+	value_type m_sample_var;
+      };
+
+
+      template<typename Value_Type>
+      bool
+      result_recorder<Value_Type>::
+      add_result(value_type res)
+      {
+	m_l.push_back(res);
+	m_sample_mean = sample_mean(m_l.begin(), m_l.end());
+	m_sample_var = sample_variance(m_l.begin(), m_l.end(), m_sample_mean);
+
+	size_t dist = std::distance(m_l.begin(), m_l.end());
+	return sample_mean_confidence_checker(m_sample_mean, m_sample_var,
+					      dist, 0.1);
+      }
+    } // namespace detail
+  } // namespace test
+} // namespace __gnu_pbds
+
+#endif 
+