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diff --git a/src/boost/libs/chrono/example/timer.hpp b/src/boost/libs/chrono/example/timer.hpp
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+//  boost/chrono/timer.hpp  ------------------------------------------------------------//
+
+//  Copyright Beman Dawes 2008
+//  Copyright 2009 Vicente J. Botet Escriba
+
+//  Distributed under the Boost Software License, Version 1.0. (See accompanying
+//  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+//  See http://www.boost.org/libs/system for documentation.
+
+#ifndef BOOSTEX_CHRONO_TIMER_HPP
+#define BOOSTEX_CHRONO_TIMER_HPP
+
+#include <boost/chrono/chrono.hpp>
+#include <boost/system/error_code.hpp>
+
+namespace boost_ex
+{
+  namespace chrono
+  {
+
+//--------------------------------------------------------------------------------------//
+//                                    timer                                             //
+//--------------------------------------------------------------------------------------//
+
+    template <class Clock=boost::chrono::high_resolution_clock>
+    class timer
+    {
+    public:
+      typedef Clock                       clock;
+      typedef typename Clock::duration    duration;
+      typedef typename Clock::time_point  time_point;
+
+      explicit timer( boost::system::error_code & ec = ::boost::throws() )
+        {
+          start(ec);
+          }
+
+     ~timer() {}  // never throws
+
+      void start( boost::system::error_code & ec = ::boost::throws() )
+        {
+          m_start = clock::now( ec );
+          }
+
+      duration elapsed( boost::system::error_code & ec = ::boost::throws() )
+        { return clock::now( ec ) - m_start; }
+
+    private:
+      time_point m_start;
+    };
+
+    typedef chrono::timer< boost::chrono::system_clock > system_timer;
+#ifdef BOOST_CHRONO_HAS_CLOCK_STEADY
+    typedef chrono::timer< boost::chrono::steady_clock > steady_timer;
+#endif
+    typedef chrono::timer< boost::chrono::high_resolution_clock > high_resolution_timer;
+
+  } // namespace chrono
+} // namespace boost_ex
+
+#endif