describe/detail/void_t.hpp

0001 #ifndef BOOST_DESCRIBE_DETAIL_VOID_T_HPP_INCLUDED
0002 #define BOOST_DESCRIBE_DETAIL_VOID_T_HPP_INCLUDED
0003
0004 // Copyright 2021 Peter Dimov
0005 // Distributed under the Boost Software License, Version 1.0.
0006 // https://www.boost.org/LICENSE_1_0.txt
0007
0008 #include <boost/describe/detail/config.hpp>
0009
0010 #if defined(BOOST_DESCRIBE_CXX11)
0011
0012 namespace boost
0013 {
0014 namespace describe
0015 {
0016 namespace detail
0017 {
0018
0019 template<class...> struct make_void
0020 {
0021     using type = void;
0022 };
0023
0024 template<class... T> using void_t = typename make_void<T...>::type;
0025
0026 } // namespace detail
0027 } // namespace describe
0028 } // namespace boost
0029
0030 #endif // defined(BOOST_DESCRIBE_CXX11)
0031
0032 #endif // #ifndef BOOST_DESCRIBE_DETAIL_VOID_T_HPP_INCLUDED