#include <boost/hana/config.hpp>
-BOOST_HANA_NAMESPACE_BEGIN
+namespace boost { namespace hana {
//! @ingroup group-concepts
//! @defgroup group-Group Group
//! The `Group` concept represents `Monoid`s where all objects have
//! [2]: http://en.wikipedia.org/wiki/Group_homomorphism
template <typename G>
struct Group;
-BOOST_HANA_NAMESPACE_END
+}} // end namespace boost::hana
#endif // !BOOST_HANA_FWD_CONCEPT_GROUP_HPP