Section: 18.104.22.168.4 [bitmask.types] Status: NAD Submitter: Hubert Tong Opened: 2016-04-14 Last modified: 2017-07-18
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The usual pattern now used for identifying where bitmask elements are declared, namely, as variables, preclude declaring them as enumerators.Compare: ctype_base::space in C++03 subclause 22.2.1 [lib.category.ctype] versus the same in N4582 subclause 22.4.1 [category.ctype]. It is unclear whether this is intentional. Further it is unclear if odr-use of bitmask elements is intended to be allowed.
[2016-05 Issues Telecon]
Jonathan believes that this was intentional, and was done by N3110. Jonathan will provide more precise references.