Use requires
-clauses and concepts for miscellaneous C++20/23 components
#4637
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Notes:
is_same_v
is not replaced withsame_as
since the latter checks twice.tuple
,pair
, andzoned_time
are not yet touched. I think they should handled in concentrated following-up PRs.MSVC is buggy on detection of forming an invalid reference type to a cv-/ref-qualified function type in a
requires
-expression. Reported DevCom-10648215.Towards #602.