The trick is to do this:
Decl special_interface
and then special_interface requires an unexported interface which you
implement in the specific (new) types that you can store in the thing.
On Fri, Jun 24, 2016 at 3:10 PM 'Mihai B' via golang-nuts <
golang-nuts@googlegroups.com> wrote:
> I'm developing a json schema generator (json schema from Go ast and the
> other way around). There is a keyword "oneOf" which requires exactly one
> schema to be valid in this keyword's value. In Go I translate it by using
> an empty interface{}. The issue is that when I convert the interface{} to
> json schema I can only say that the object can be of any type even if I
> know that it can hold only a small subset.
> Therefore I'm wondering if placing some constrains on the types that
> could be implemented by the interface would be a good idea. For example
> instead of `type interface{}` which implements any type we could define the
> types it can implement (e.g. type X interface{T1, T2, T3} ). This way we
> don't have a totally black box so it improves the documentation/semantics
> and we avoid specific bugs using static analysis. Currently the practice
> seems to be documenting the types in pure comments[0] which cannot be
> analysed statically. Another option that I'm considering now is to use the
> empty interface but with specific tags [1] and use an external tool. This
> might have been proposed before but I can't find it on the mailing list.
> What do you think?
>
> [0] https://golang.org/pkg/go/ast/#Object
> [1]
>
> type Object struct {
> Name string <https://golang.org/pkg/builtin/#string> // declared
> name
> Decl interface{}
> `interface:"Field,FuncDecl,LabeledStmt,external.Scope" //
>
> }
>
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