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diff --git a/boost/log/detail/value_ref_visitation.hpp b/boost/log/detail/value_ref_visitation.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   value_ref_visitation.hpp
+ * \author Andrey Semashev
+ * \date   28.07.2012
+ *
+ * \brief  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. In this file
+ *         internal configuration macros are defined.
+ */
+
+#ifndef BOOST_LOG_DETAIL_VALUE_REF_VISITATION_HPP_INCLUDED_
+#define BOOST_LOG_DETAIL_VALUE_REF_VISITATION_HPP_INCLUDED_
+
+#include <boost/mpl/at.hpp>
+#include <boost/mpl/begin.hpp>
+#include <boost/mpl/end.hpp>
+#include <boost/mpl/advance.hpp>
+#include <boost/mpl/erase.hpp>
+#include <boost/mpl/size.hpp>
+#include <boost/preprocessor/arithmetic/inc.hpp>
+#include <boost/preprocessor/repetition/repeat_from_to.hpp>
+#include <boost/preprocessor/iteration/iterate.hpp>
+#include <boost/log/detail/config.hpp>
+#include <boost/log/detail/header.hpp>
+
+#ifndef BOOST_LOG_VALUE_REF_VISITATION_UNROLL_COUNT
+#define BOOST_LOG_VALUE_REF_VISITATION_UNROLL_COUNT 8
+#endif
+
+namespace boost {
+
+BOOST_LOG_OPEN_NAMESPACE
+
+namespace aux {
+
+template< typename SequenceT, typename VisitorT, unsigned int SizeV = mpl::size< SequenceT >::value >
+struct apply_visitor_dispatch
+{
+    typedef typename VisitorT::result_type result_type;
+
+    static BOOST_FORCEINLINE result_type call(const void* p, unsigned int type_index, VisitorT& visitor)
+    {
+        typedef typename mpl::begin< SequenceT >::type begin_type;
+        typedef typename mpl::advance_c< begin_type, SizeV / 2u >::type middle_type;
+        if (type_index < (SizeV / 2u))
+        {
+            typedef typename mpl::erase< SequenceT, middle_type, typename mpl::end< SequenceT >::type >::type new_sequence;
+            typedef apply_visitor_dispatch< new_sequence, VisitorT > new_dispatch;
+            return new_dispatch::call(p, type_index, visitor);
+        }
+        else
+        {
+            typedef typename mpl::erase< SequenceT, begin_type, middle_type >::type new_sequence;
+            typedef apply_visitor_dispatch< new_sequence, VisitorT > new_dispatch;
+            return new_dispatch::call(p, type_index - (SizeV / 2u), visitor);
+        }
+    }
+};
+
+#define BOOST_LOG_AUX_CASE_ENTRY(z, i, data)\
+    case i: return visitor(*static_cast< typename mpl::at_c< SequenceT, i >::type const* >(p));
+
+#define BOOST_PP_FILENAME_1 <boost/log/detail/value_ref_visitation.hpp>
+#define BOOST_PP_ITERATION_LIMITS (1, BOOST_PP_INC(BOOST_LOG_VALUE_REF_VISITATION_VTABLE_SIZE))
+#include BOOST_PP_ITERATE()
+
+#undef BOOST_LOG_AUX_CASE_ENTRY
+
+} // namespace aux
+
+BOOST_LOG_CLOSE_NAMESPACE // namespace log
+
+} // namespace boost
+
+#include <boost/log/detail/footer.hpp>
+
+#endif // BOOST_LOG_DETAIL_VALUE_REF_VISITATION_HPP_INCLUDED_
+
+#ifdef BOOST_PP_IS_ITERATING
+
+#define BOOST_LOG_AUX_SWITCH_SIZE BOOST_PP_ITERATION()
+
+template< typename SequenceT, typename VisitorT >
+struct apply_visitor_dispatch< SequenceT, VisitorT, BOOST_LOG_AUX_SWITCH_SIZE >
+{
+    typedef typename VisitorT::result_type result_type;
+
+    static BOOST_FORCEINLINE result_type call(const void* p, unsigned int type_index, VisitorT& visitor)
+    {
+        switch (type_index)
+        {
+        BOOST_PP_REPEAT_FROM_TO(1, BOOST_LOG_AUX_SWITCH_SIZE, BOOST_LOG_AUX_CASE_ENTRY, ~)
+        default:
+            return visitor(*static_cast< typename mpl::at_c< SequenceT, 0 >::type const* >(p));
+        }
+    }
+};
+
+#undef BOOST_LOG_AUX_SWITCH_SIZE
+
+#endif // BOOST_PP_IS_ITERATING