#include <boost/hana/core/when.hpp>
-BOOST_HANA_NAMESPACE_BEGIN
+namespace boost { namespace hana {
//! Extract a value in a given comonadic context.
//! @ingroup group-Comonad
//!
constexpr decltype(auto) operator()(W_&& w) const;
};
- constexpr extract_t extract{};
+ BOOST_HANA_INLINE_VARIABLE constexpr extract_t extract{};
#endif
-BOOST_HANA_NAMESPACE_END
+}} // end namespace boost::hana
#endif // !BOOST_HANA_FWD_EXTRACT_HPP