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diff --git a/src/boost/libs/log/test/common/attr_comparison.hpp b/src/boost/libs/log/test/common/attr_comparison.hpp
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+++ b/src/boost/libs/log/test/common/attr_comparison.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   attr_comparison.hpp
+ * \author Andrey Semashev
+ * \date   06.08.2010
+ *
+ * \brief  This header contains tools for attribute comparison in attribute-related tests.
+ */
+
+#ifndef BOOST_LOG_TESTS_ATTR_COMPARISON_HPP_INCLUDED_
+#define BOOST_LOG_TESTS_ATTR_COMPARISON_HPP_INCLUDED_
+
+#include <ostream>
+#include <boost/log/attributes/attribute.hpp>
+
+class attribute_factory_helper :
+    public boost::log::attribute
+{
+    typedef boost::log::attribute base_type;
+
+public:
+    attribute_factory_helper(base_type const& that) : base_type(that)
+    {
+    }
+
+    impl* get_impl() const
+    {
+        return base_type::get_impl();
+    }
+};
+
+namespace boost {
+
+BOOST_LOG_OPEN_NAMESPACE
+
+inline bool operator== (attribute const& left, attribute const& right)
+{
+    return attribute_factory_helper(left).get_impl() == attribute_factory_helper(right).get_impl();
+}
+inline bool operator!= (attribute const& left, attribute const& right)
+{
+    return attribute_factory_helper(left).get_impl() != attribute_factory_helper(right).get_impl();
+}
+
+inline std::ostream& operator<< (std::ostream& strm, attribute const& val)
+{
+    strm << attribute_factory_helper(val).get_impl();
+    return strm;
+}
+
+BOOST_LOG_CLOSE_NAMESPACE // namespace log
+
+} // namespace boost
+
+#endif // BOOST_LOG_TESTS_ATTR_COMPARISON_HPP_INCLUDED_