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CWG2932 Value range of empty enumeration #2138
Description
Activity
EWG discussed this during the Monday AM session in Sofia. After extensive discussion, we determined that we require a paper to properly consider the state of the current implementations, the differences in the various standards versions, and the options presented. @GabrielDosReis volunteered to be 'person in charge' for that paper.
C++17 defined the values of an empty enumeration to be just 0.
As-is, CWG2932 restores that rule.
However, popular implementations determine the value range of an empty enumeration to be 0 and 1, reflecting the single bit of storage assigned to the representation.
EWG should decide whether to keep the C++17 rule or adjust the wording to the implementation practice.