What does singular mean in ProtoBuf >=3.15?

[Michael Vodep]

Hi

I have done now some research: singular seem to be fields, that have no addition field rules (like optional, repeated, map). There is no presence indication. 

BUT: The docu says:

"a well-formed message can have zero or one of this field (but not more than one)"

What does that mean? Are this wrapper messages with 1 field meant? https://github.com/protocolbuffers/protobuf/blob/main/src/google/protobuf/wrappers.proto

Thanks a lot

Michael

[Marc Gravell]

An 'optional' field is still singular (optional having been re-added to proto3 relatively recently); singular just means: not 'repeated'

With regards to "wrappers.proto": all of the inner values in the wrapper types are singular; as stated in the text part of wrappers.proto, it isn't intended to use "repeated" with wrappers types, as the field presence doesn't align perfectly in that case. But ultimately, that's mostly up to your usage.

Marc

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Regards,

Marc

[Marc Gravell]

(oh, and not "map"; "map" is just a specialized example of the semantics from "repeated", under the hood)

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Regards,

Marc