And by "interface signatures" I of course meant method signatures in the corresponding interface method sets.
On Monday, October 28, 2024 at 4:39:35 PM UTC-4 Jason Phillips wrote: > The Go FAQ has another, perhaps slightly more applicable, entry: > > https://go.dev/doc/faq#t_and_equal_interface > > Basically, even though *packet satisfies the Packet interface, > > interface { > Get() *packet > } > > Is different than > > interface { > Get() Packet > } > > And one isn't directly convertible into the other. In Go, interface > signatures must match _exactly_ in order to satisfy an interface. > > > Jason > On Monday, October 28, 2024 at 3:44:37 PM UTC-4 Marvin Renich wrote: > >> * Log4bob <qdon...@gmail.com> [241028 08:47]: >> > >> > >> > Given there's a generic interface: >> > type Packet interface { Content() int } type Recycler[T any] interface >> { >> > Get() *T } >> > >> > and their implementation: >> > type packet struct { content int } type BaseRecycler[T any] struct { t >> T } >> > >> > its impossible to convert the implementation to the interface: >> > r := &BaseRecycler[packet]{} r1 := r.(Recycler[Packet]) >> > fmt.Println(r3.Get().Content()) // compile error: Unresolved reference >> > 'Content' >> > >> > here is a live code example: https://go.dev/play/p/qbnYfyDd22A >> > >> > The error is because the Packet interface align with the *packet >> instead of >> > packet. Could anyone suggest how to handle this? >> >> If you uncomment line 39 (assignment to r3), add «_ = r3» to avoid >> "unused variable" error, and run it, you get a runtime panic. Your >> primary problem is related to this FAQ: >> >> https://go.dev/doc/faq#convert_slice_of_interface >> >> because BaseRecycler[packet] is "struct { t packet }" not "struct { t >> Packet }" so r is *struct { t packet }, which has a different, and >> differently sized, internal representation. >> >> What are you really trying to do? >> >> ...Marvin >> >> -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion visit https://groups.google.com/d/msgid/golang-nuts/0eea1dd7-bf0b-4c6a-bd13-ab2f638b497bn%40googlegroups.com.
