Erin is correct.
For #2, the command-line syntax to have the compiler echo back capnp format
(with all type IDs defined explicitly) is:
capnp compile -ocapnp foo.capnp
This of course requires that `capnp` and the generator plugin
`capnpc-capnp` are in your $PATH, which they should be after installing
Cap'n Proto globally. If you haven't installed it globally, you can do:
path/to/capnp compile -opath/to/capnpc-capnp foo.capnp
In any case, the output will go to the terminal (no files are generated).
-Kenton
On Wed, Nov 25, 2020 at 1:52 PM Erin Shepherd <[email protected]> wrote:
> 1. This depends. The only places that the IDs get used "behind the scenes"
> are (a) those on interfaces are used in RPC calls to identify the interface
> and (b) when encoding schema annotations
>
> On the other hand, someone might be explicitly reading the ID from the
> schema file or the constant from the generated code
>
> 2. capnpc can be asked to generate capnp format output. In that case,
> it'll emit a copy of the schema with comments stripped and all
> automatically generated IDs inserted. You can grab the ID (and syntax) from
> there
>
> - Erin
>
> On Wed, 25 Nov 2020, at 20:39, Matt Stern wrote:
>
> Hi all,
>
> Suppose I have a simple schema file:
>
> 0xabbeabbeabbeabbe;
>
> struct Foo {
> val @0 : UInt32;
> };
> struct Bar {
> val @1 : UInt32;
> };
>
> I would like to move Bar into a separate schema file. If I understand the
> docs <https://capnproto.org/language.html#unique-ids> correctly, then
> this will change Bar's unique ID.
>
> I have two questions about that:
>
> 1. Will changing Bar's unique ID cause backwards incompatibility with
> old messages that are serialized with the old ID?
> 2. If so, what can I do to prevent this? I would like my change to
> have no side-effects (a pure no-op).
>
> Thanks!
>
>
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