Nested Enum with protobuf and rust

[Chedy Souffargi]

I am working on a Rust project, using Protocol Buffers, and dealing with nested enums. Here's what I have so far in Rust:

enum Vehicle { Car(CarType), Truck(TruckType), } enum CarType { Sedan, Coupe, Hatchback, } enum TruckType { Pickup, Semi, } fn create_vehicle_fleet() -> [Vehicle; 8] { [ Vehicle::Car(CarType::Sedan), Vehicle::Truck(TruckType::Pickup), Vehicle::Car(CarType::Coupe), Vehicle::Truck(TruckType::Semi), Vehicle::Car(CarType::Hatchback), Vehicle::Car(CarType::Sedan), Vehicle::Truck(TruckType::Pickup), Vehicle::Car(CarType::Coupe), ] }

I cannot find a proper way to represent the Vehicle enum in protobuf. Can anyone suggest a solution or provide guidance on how to handle this situation in Protocol Buffers?

[Daz Wilkin]

I took a stab at a reply to your question on Stack overflow:

https://stackoverflow.com/questions/78355748/nested-enum-with-protobuf

[Em Rauch]

The suggestion on stack overflow looks correct: Rust's language enums are "tagged unions", the Protobuf `oneof` feature also acts as a tagged union. Protobuf Enums are intended to be more semantically like C++ enums (which cannot hold values inside).

Can you clarify the followup comment "AAOS stands for Android Automotive OS. The IDL that generates publisher code, struggles with message types"? Any documentation links would be helpful for us to follow up on if there's some deliberate limitation or just an unfortunate technical state that might be worked around.

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