#include <boost/hana/core/when.hpp>
-BOOST_HANA_NAMESPACE_BEGIN
+namespace boost { namespace hana {
//! Prepend an element to a monadic structure.
//! @ingroup group-MonadPlus
//!
constexpr auto operator()(Xs&& xs, X&& x) const;
};
- constexpr prepend_t prepend{};
+ BOOST_HANA_INLINE_VARIABLE constexpr prepend_t prepend{};
#endif
-BOOST_HANA_NAMESPACE_END
+}} // end namespace boost::hana
#endif // !BOOST_HANA_FWD_PREPEND_HPP