#include <boost/hana/less.hpp>
-BOOST_HANA_NAMESPACE_BEGIN
+namespace boost { namespace hana {
template <typename Ord>
struct Orderable
: hana::integral_constant<bool,
typename tag_of<Ord>::type>>::value
>
{ };
-BOOST_HANA_NAMESPACE_END
+}} // end namespace boost::hana
#endif // !BOOST_HANA_CONCEPT_ORDERABLE_HPP