How to use OneOf?

[DenisVoronets]

Hello!
I am using your great library to work with protobuf, and I'm confused how to use OneOf in generated Kotlin classes.
For example:

1. I got .proto file with this info

syntax = "proto2";

message SomeProto {

oneof message {
   ClassA classA = 1;
   ClassB classB = 2;
   }
}

2. After build via Wire library, I got Kotlin class of this .proto file.
3. And now, after decode() I want to know which Class of message I received

val messageType = SomeProto.ADAPTER.decode(receivedByteArray)
if(messageType == ClassA) {
  // do stuff for ClassA
} else if (messageType = ClassB) {
  // do stuff for ClassB
}

For now I check like this:

if(decodedMessage.ClassA != null) {
   messageType = ClassA
} else if(decodedMessage.ClassB != null) {
   messageType = ClassB
}

---

Question is: how can I use OneOf in Kotlin to handle message Type?

[oldergod]

oneofs fields are inlined. We do a null check on each one of those fields until we find the one set. On top of it, we have a runtime check which throws if more than one field within a oneof is set. We don't offer ways to smartcast the set fields; that might be doable with extension functions?

[DenisVoronets]

I see, thank you!