Hi Andrew,
Yes, you got it right. Annoyingly you will have to keep that unused Void in
there, but at least it doesn't take any space on the wire.
-Kenton
On Mon, May 1, 2023 at 4:35 PM 'Andrew Sun' via Cap'n Proto <
capnproto@googlegroups.com> wrote:
> Suppose I have a schema that looks like this:
>
> struct Foo {
> union {
> bar @0 :Void;
> baz @1 :UInt64;
> # ...
> }
>
> # ...
> }
>
> Now suppose I want to add information to union member bar, or I want to
> add more fields to baz. What options do I have to do this in a forwards-
> and backwards-compatible manner?
>
> Would this be the "correct" way to evolve the schema?
>
> struct Foo {
> union {
> bar :group {
> unused @0 :Void;
> foo @2 :UInt32;
> bar @3 :OtherStruct;
> # ...
> }
> baz :group {
> a @1 :UInt64;
> b @4 :Text;
> # ...
> }
> # ...
> }
>
> # ...
> }
>
>
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