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diff --git a/libstdc++-v3/testsuite/util/performance/time/elapsed_timer.hpp b/libstdc++-v3/testsuite/util/performance/time/elapsed_timer.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 elapsed_timer.hpp
+ * Contains time utilities for tests.
+ */
+
+#ifndef PB_DS_TEST_TIME_HPP
+#define PB_DS_TEST_TIME_HPP
+
+#include <time.h>
+#include <iosfwd>
+
+namespace __gnu_pbds
+{
+
+  namespace test
+  {
+
+    class elapsed_timer
+    {
+    public:
+      elapsed_timer();
+
+      void
+      reset();
+
+      operator double() const;
+
+    protected:
+      clock_t m_start;
+    };
+
+  } // namespace test
+
+} // namespace __gnu_pbds
+
+#endif // #ifndef PB_DS_TEST_TIME_HPP