#include <boost/hana/core/when.hpp>
-BOOST_HANA_NAMESPACE_BEGIN
+namespace boost { namespace hana {
//! Returns a `hana::type` representing the compile-time hash of an object.
//! @ingroup group-Hashable
//!
constexpr auto operator()(X const& x) const;
};
- constexpr hash_t hash{};
+ BOOST_HANA_INLINE_VARIABLE constexpr hash_t hash{};
#endif
-BOOST_HANA_NAMESPACE_END
+}} // end namespace boost::hana
#endif // !BOOST_HANA_FWD_HASH_HPP