[C++] Use C++17 inline variables for enum_value #8489
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Trait structs have declarations of
enum_value, which are static variables, but these structs don't have the instance definition of the variables. That causes link errors if a user takes the address of such variables, explicitly or implicitly. (ref: https://wandbox.org/permlink/oIB71xEbLzU5QIH6 )We can easily solve it by converting them to inline variables in C++17.
(ref: https://wandbox.org/permlink/GqrQKdIDETQiS1v4 )
WDYT?