#include <boost/hana/core/dispatch.hpp>
-BOOST_HANA_NAMESPACE_BEGIN
+namespace boost { namespace hana {
//! @cond
template <typename Pair>
constexpr decltype(auto) first_t::operator()(Pair&& pair) const {
template <typename ...Args>
static constexpr auto apply(Args&& ...) = delete;
};
-BOOST_HANA_NAMESPACE_END
+}} // end namespace boost::hana
#endif // !BOOST_HANA_FIRST_HPP