#include <utility>
-BOOST_HANA_NAMESPACE_BEGIN
+namespace boost { namespace hana {
//! @cond
template <typename Xs, typename Ys>
constexpr auto concat_t::operator()(Xs&& xs, Ys&& ys) const {
std::make_index_sequence<yi>{});
}
};
-BOOST_HANA_NAMESPACE_END
+}} // end namespace boost::hana
#endif // !BOOST_HANA_CONCAT_HPP