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 On Mon, 5 Dec 2022 at 11:22, Michael Vodep <[email protected]> wrote: > 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 > > > -- > You received this message because you are subscribed to the Google Groups > "Protocol Buffers" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/protobuf/7743f999-de53-4861-b82b-3779a400e900n%40googlegroups.com > <https://groups.google.com/d/msgid/protobuf/7743f999-de53-4861-b82b-3779a400e900n%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- Regards, Marc -- You received this message because you are subscribed to the Google Groups "Protocol Buffers" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/protobuf/CAF95VAxuDvQ5d%2B55f3z1Y7623Pd9UGvOxB9WZAVK5b%2B1JLEvdA%40mail.gmail.com.
