LWG-4037 Static data members of `ctype_base` are not yet required to be usable in constant expressions See also: * (Status: New) LWG-3998 Constants in `std::regex_constants` should be allowed to be enumerators * #4100
LWG-4037 Static data members of
ctype_baseare not yet required to be usable in constant expressionsSee also:
std::regex_constantsshould be allowed to be enumerators<regex>: Constants instd::regex_constantsare notconstexprvariables #4100