#include <boost/hana/second.hpp>
-BOOST_HANA_NAMESPACE_BEGIN
+namespace boost { namespace hana {
template <typename P>
struct Product
: hana::integral_constant<bool,
!is_default<second_impl<typename tag_of<P>::type>>::value
>
{ };
-BOOST_HANA_NAMESPACE_END
+}} // end namespace boost::hana
#endif // !BOOST_HANA_CONCEPT_PRODUCT_HPP