On Fri, Jul 17, 2020 at 12:36 PM Josh Hoak <jrh...@gmail.com> wrote:
>
> I was playing around with trying to use generics to de-interface-ify a fuzzer
> implementation, and I ran into some stumbling blocks.
>
> is it possible to perform type switches? It seems the answer is currently no
> (example, design doc reference). Maybe there's a better way to handle the
> following?
>
> type Primitive interface {
> type int, string
> }
>
> func Randomize(type F Primitive)(f F, r *rand.Rand) F {
> switch v := (interface{})(f).(type) {
> case string:
> return fmt.Sprintf("%s--%d", v, r.Int())
> case int:
> return v + r.Int()
> default:
> panic(fmt.Sprintf("I don't know about type %T!\n", v))
> }
> }
>
> func main() {
> r := rand.New(rand.NewSource(1))
> fmt.Println(Randomize(int)(1, r))
> }
Yes, there currently is no way to switch on the underlying type of the
type argument, as discussed in the part of the design draft that you
link to.
Ian
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