Thank you very much, that's actually what I was looking for. On Monday, 14 August 2023 at 13:57:35 UTC-3 Axel Wagner wrote:
> You might be interested in https://github.com/golang/go/issues/61372 > > On Mon, Aug 14, 2023 at 3:52 PM Diego Augusto Molina < > diegoaugu...@gmail.com> wrote: > >> Hi, thank you for reading. Whenever I need to use a zero value for a >> generic type in a func I do something like the following: >> >> <code> >> func SetZero[T any](pt *T) T { >> var zeroT T >> *pt = zeroT >> } >> </code> >> >> That's all good, but I wonder how, if possible, it could be proved to the >> compiler that zeroT is the zero value for T. That would be to enable >> memclr optimization when bulk setting slice or array values to the zero >> value of their element type. Currently, as of 1.21, this only works when >> the src is a constant holding the zero value of the type. I also tried with >> something like *new(T), and it doesn't work either. But proving that the >> expression *new(T) in the src is the zero value for the type could >> potentially be easier than checking back if a certain variable (e.g. >> zeroT in the example) hasn't yet been reassigned or initialized to a >> non-zero value. >> Also, as there's no guarantee of what would T could hold, it could use >> memclrHasPointers if that makes sense, which seems like a fare tradeoff >> at least for now if we want to play with slices with generic element type. >> For reference, this is the code I'm trying: >> >> <code> >> package main >> // file generic_slice_element_type_memclr.go >> >> func clear[T any](s []T) { >> for i := range s { >> s[i] = *new(T) >> } >> } >> >> func main() { >> clear([]int{1, 2, 3}) >> } >> </code> >> >> And I'm compiling it with: >> >> <code> >> $ go version >> go version go1.21.0 darwin/amd64 >> $ go tool compile -S generic_slice_element_type_memclr.go >> ... >> </code> >> >> Kind regards. >> >> -- >> 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...@googlegroups.com. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/golang-nuts/b8ec1335-911c-42ed-96ce-a4b50153b8c9n%40googlegroups.com >> >> <https://groups.google.com/d/msgid/golang-nuts/b8ec1335-911c-42ed-96ce-a4b50153b8c9n%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> > -- 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 on the web visit https://groups.google.com/d/msgid/golang-nuts/65671596-e4ba-488a-946c-d00f9aef3f20n%40googlegroups.com.
