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Chapter17/cib/libs/boost/mp11/detail/mp_void.hpp

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+#ifndef BOOST_MP11_DETAIL_MP_VOID_HPP_INCLUDED
+#define BOOST_MP11_DETAIL_MP_VOID_HPP_INCLUDED
+
+//  Copyright 2015-2017 Peter Dimov.
+//
+//  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
+
+namespace boost
+{
+namespace mp11
+{
+
+// mp_void<T...>
+namespace detail
+{
+
+template<class... T> struct mp_void_impl
+{
+    using type = void;
+};
+
+} // namespace detail
+
+template<class... T> using mp_void = typename detail::mp_void_impl<T...>::type;
+
+} // namespace mp11
+} // namespace boost
+
+#endif // #ifndef BOOST_MP11_DETAIL_MP_VOID_HPP_INCLUDED