zero size of a protobuf message

[Евгений Х]

Hello!

I have the protobuf message like this:

message SomeMessage {

    optional uint32 result = 1;

}

When I don't fill the result field and then call the ByteSize function it returns 0.

Is it correct?

P.S. C++ program

[Nadav Samet]

Yes, this is the expected behavior. Unset optional fields are not serialized, so the total size of the serialized message is zero. You can parse back an empty array of bytes to get an instance of SomeMessage with an unset `result` field.

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-Nadav

[Евгений Х]

Thanks for response