Support enum field for Oneof

[tnodir]

Problem description Generator doesn't create enum for Oneof cases.

Suggestion/solution Generator should create enum field for Oneof cases. And (de)serializer should fill the field.

Additional context See the docs, how standard CPP generator supports it.

[Eijebong]

Am I reading correctly in that there currently no way of knowing which variant of a oneof is populated?