#include <boost/hana/config.hpp>
-BOOST_HANA_NAMESPACE_BEGIN
+namespace boost { namespace hana {
//! @ingroup group-concepts
//! @defgroup group-Comparable Comparable
//! The `Comparable` concept defines equality and inequality.
//! [4]: http://en.wikipedia.org/wiki/Injective_function
template <typename T>
struct Comparable;
-BOOST_HANA_NAMESPACE_END
+}} // end namespace boost::hana
#endif // !BOOST_HANA_FWD_CONCEPT_COMPARABLE_HPP