#include <utility>
-BOOST_HANA_NAMESPACE_BEGIN
+namespace boost { namespace hana {
//! @cond
template <typename Xs, typename Key>
constexpr decltype(auto) at_key_t::operator()(Xs&& xs, Key const& key) const {
return accessor(static_cast<X&&>(x));
}
};
-BOOST_HANA_NAMESPACE_END
+}} // end namespace boost::hana
#endif // !BOOST_HANA_AT_KEY_HPP