#include <boost/hana/config.hpp>
-BOOST_HANA_NAMESPACE_BEGIN
+namespace boost { namespace hana {
//! @ingroup group-concepts
//! @defgroup group-Functor Functor
//! The `Functor` concept represents types that can be mapped over.
//! [3]: http://en.wikipedia.org/wiki/Category_theory
template <typename F>
struct Functor;
-BOOST_HANA_NAMESPACE_END
+}} // end namespace boost::hana
#endif // !BOOST_HANA_FWD_CONCEPT_FUNCTOR_HPP