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diff --git a/boost/log/detail/native_typeof.hpp b/boost/log/detail/native_typeof.hpp
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+/*
+ *          Copyright Andrey Semashev 2007 - 2014.
+ * 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)
+ */
+/*!
+ * \file   native_typeof.hpp
+ * \author Andrey Semashev
+ * \date   08.03.2009
+ *
+ * This header is the Boost.Log library implementation, see the library documentation
+ * at http://www.boost.org/doc/libs/release/libs/log/doc/html/index.html.
+ */
+
+#ifndef BOOST_LOG_DETAIL_NATIVE_TYPEOF_HPP_INCLUDED_
+#define BOOST_LOG_DETAIL_NATIVE_TYPEOF_HPP_INCLUDED_
+
+#include <boost/log/detail/config.hpp>
+
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#pragma once
+#endif
+
+#if !defined(BOOST_NO_CXX11_DECLTYPE)
+
+namespace boost {
+
+BOOST_LOG_OPEN_NAMESPACE
+
+namespace aux {
+
+template< typename T >
+T get_root_type(T const&);
+
+} // namespace aux
+
+BOOST_LOG_CLOSE_NAMESPACE // namespace log
+
+} // namespace boost
+
+#define BOOST_LOG_TYPEOF(x) decltype(::boost::log::aux::get_root_type(x))
+
+#elif defined(__COMO__) && defined(__GNUG__)
+
+#define BOOST_LOG_TYPEOF(x) typeof(x)
+
+#elif defined(__GNUC__) || defined(__MWERKS__)
+
+#define BOOST_LOG_TYPEOF(x) __typeof__(x)
+
+#endif
+
+
+#if !defined(BOOST_NO_CXX11_AUTO_DECLARATIONS)
+#define BOOST_LOG_AUTO(var, expr) auto var = (expr)
+#endif
+
+#if !defined(BOOST_LOG_AUTO) && defined(BOOST_LOG_TYPEOF)
+#define BOOST_LOG_AUTO(var, expr) BOOST_LOG_TYPEOF((expr)) var = (expr)
+#endif
+
+#endif // BOOST_LOG_DETAIL_NATIVE_TYPEOF_HPP_INCLUDED_