#include <boost/hana/config.hpp>
-BOOST_HANA_NAMESPACE_BEGIN
+namespace boost { namespace hana {
//! @ingroup group-concepts
//! @defgroup group-Orderable Orderable
//! The `Orderable` concept represents totally ordered data types.
//! [4]: http://en.wikipedia.org/wiki/Strict_weak_ordering
template <typename Ord>
struct Orderable;
-BOOST_HANA_NAMESPACE_END
+}} // end namespace boost::hana
#endif // !BOOST_HANA_FWD_CONCEPT_ORDERABLE_HPP