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+/*
+Copyright 2017-2018 Glen Joseph Fernandes
+<glenjofe -at- gmail.com>
+
+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)
+*/
+
+#ifndef BOOST_TT_DETECTED_OR_HPP_INCLUDED
+#define BOOST_TT_DETECTED_OR_HPP_INCLUDED
+
+#include <boost/type_traits/detail/detector.hpp>
+
+namespace boost {
+
+template<class Default, template<class...> class Op, class... Args>
+using detected_or = detail::detector<Default, void, Op, Args...>;
+
+template<class Default, template<class...> class Op, class... Args>
+using detected_or_t = typename detected_or<Default, Op, Args...>::type;
+
+} /* boost */
+
+#endif