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diff --git a/boost/log/detail/is_ostream.hpp b/boost/log/detail/is_ostream.hpp
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+/*
+ *          Copyright Andrey Semashev 2007 - 2015.
+ * 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   is_ostream.hpp
+ * \author Andrey Semashev
+ * \date   05.07.2015
+ *
+ * \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_IS_OSTREAM_HPP_INCLUDED_
+#define BOOST_LOG_DETAIL_IS_OSTREAM_HPP_INCLUDED_
+
+#include <iosfwd>
+#include <boost/type_traits/is_base_of.hpp>
+#include <boost/type_traits/has_left_shift.hpp>
+#include <boost/log/detail/config.hpp>
+#include <boost/log/utility/formatting_ostream_fwd.hpp>
+#include <boost/log/detail/header.hpp>
+
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#pragma once
+#endif
+
+namespace boost {
+
+BOOST_LOG_OPEN_NAMESPACE
+
+namespace aux {
+
+template< typename T >
+struct is_ostream
+{
+    static BOOST_CONSTEXPR_OR_CONST bool value = is_base_of< std::ios_base, T >::value && has_left_shift< T, int >::value;
+};
+
+template< typename CharT, typename TraitsT, typename AllocatorT >
+struct is_ostream< basic_formatting_ostream< CharT, TraitsT, AllocatorT > >
+{
+    static BOOST_CONSTEXPR_OR_CONST bool value = true;
+};
+
+} // namespace aux
+
+BOOST_LOG_CLOSE_NAMESPACE // namespace log
+
+} // namespace boost
+
+#include <boost/log/detail/footer.hpp>
+
+#endif // BOOST_LOG_DETAIL_IS_OSTREAM_HPP_INCLUDED_