[locale.categories] Promote remaining static const data members to constexpr
#6767
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Rebased & force-pushed. @tkoeppe |
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See also #4862. After the changes there's no static const data members that are guaranteed to be usable in constant expressions but not constexpr.
The changes seemingly require these static data members to be implicitly inline variables, but [contents]/1 has already required an implementation to provide definitions for them, so the difference between plain
constandconstexpris unobservable.The last remain pieces are static data members of
ctype_base- it's not strictly required that these members are required to be usable in constant expressions sincemaskmay be a class type. LWG4037 is opened for this. Edit: LWG4037 has been resolved.