On Fri, Feb 17, 2023 at 3:34 PM Jochen Voss <jochen.v...@gmail.com> wrote:
>
> I'm trying to write a generic function like the following (simplified) one:
>
> type V interface {
> comparable // (1)
> SomeMethod(V)
> }
>
> func Test[val V](x val) {
> m := make(map[val]int) // (2)
> // uses a x as key in a map and calls x.SomeMethod()
> }
>
> When I try this, see https://go.dev/play/p/cJoH5YwEHaK , I get an error
> message for (1): "cannot use type V outside a type constraint: interface is
> (or embeds) comparable". If I remove the line (1) I get an error for (2)
> instead: "invalid map key type val (missing comparable constraint)".
>
> Is there a way to make something like this work?
Are you using Go 1.20? See https://go.dev/blog/comparable .
Ian
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