On Thu, Dec 22, 2022 at 2:24 PM Pierre Durand <pierredur...@gmail.com> wrote:
> Same question for `len()`: is there a way to declare a constraint that > matches types that support `len()` ? For this, the workaround you posted works, at least. It's not convenient, but it also does not seem like a common need - again I'd be kind of curious what you want it for. > > Le jeudi 22 décembre 2022 à 14:23:22 UTC+1, Pierre Durand a écrit : > >> Is there a way to declare a "nillable" constraint that matches all types >> that can be nil (pointer, slice, map, etc.) ? >> >> I would like to write a function, that receives a parameter (with a >> generic type), and check if this parameter is nil. >> I found a very ugly way to write it: https://go.dev/play/p/0g0SoTlBEgs >> The problem: the map type needs more than 1 type, so I need to provide >> the 3 types when I call the `IsNil()` function/ >> Is there a better way ? >> >> Yes I know I could use `any`, and check with reflect if the value inside >> the interface is nil. >> But I want to know if it's possible to do it with generics. >> >> Thank you. >> > -- > 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/5101cdb3-601a-4eec-b278-5be07a891590n%40googlegroups.com > <https://groups.google.com/d/msgid/golang-nuts/5101cdb3-601a-4eec-b278-5be07a891590n%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/CAEkBMfGKqXE5KNnCWW7T-1jqFJN6TF7JzV7_ZNvTKFARLegxRg%40mail.gmail.com.
