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@moonlightbox(Johnny Chu)

Google Protobuf - How to Define an Optional Field in Protobuf 3?

Last updated at Posted at 2019-01-08

Answer:　In proto3, all fields are "optional".

import "google/protobuf/wrappers.proto";

message Foo {
    int32 bar = 1;
    google.protobuf.Int32Value baz = 2;
}

if(foo.hasBaz()) { ... }

https://matsu-chara.hatenablog.com/entry/2016/11/12/110000
https://tomasbasham.co.uk/development/2017/09/13/protocol-buffers-and-optional-values.html
https://stackoverflow.com/questions/42622015/how-to-define-an-optional-field-in-protobuf-3

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