(Concerning p1902r1)
Since unwrap_reference and unwrap_ref_decay are defined in <functional> ([functional.syn]), their feature test macro should also be defined there.
(unwrap_reference and unwrap_ref_decay depend on reference_wrapper, so it makes sense for them to live in <functional>.)
(Concerning p1902r1)
Since
unwrap_referenceandunwrap_ref_decayare defined in<functional>([functional.syn]), their feature test macro should also be defined there.(
unwrap_referenceandunwrap_ref_decaydepend onreference_wrapper, so it makes sense for them to live in<functional>.)