On Fri, May 7, 2021 at 11:08 AM Viet Nguyen <[email protected]> wrote:
>
> I'm trying to convert this code to use generics:
>
> type Cache interface {
> GetIfPresent(interface{}) (interface{}, bool)
> }
>
> type LoadingCache interface {
> Cache
> Get(interface{}) (interface{}, error)
> }
>
> However, I couldn't find any way to include Cache[K, V] in LoadingCache[K,
> V]. (No similar use cases in the proposal? I must miss something here). The
> workaround is copying all methods over, like:
>
> type Cache[K comparable, V any] interface {
> GetIfPresent(K) (V, bool)
> }
>
> type LoadingCache[K comparable, V any] interface {
> GetIfPresent(K) (V, bool) // FIXME: Embedding the Cache interface
> Get(K) (V, error)
> }
>
> // See: https://go2goplay.golang.org/p/T7h15CdUEa3
> // WIP: https://github.com/goburrow/cache/tree/go2
The go2go tool is an experiment and it does not support all valid
code. It's particularly bad at embedding. In the real release it
should work to write
type LoadingCache[K comparable, V any] interface {
Cache[K, V]
Get(K) (V, error)
}
Ian
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