Also note: reflect.DeepEqual doesn't *just* compare the contents of the map. It only compares contents if the maps aren't "the same map object". >From the documentation:
> Map values are deeply equal when all of the following are true: they are both nil or both non-nil, they have the same length, and either they are the same map object or their corresponding keys (matched using Go equality) map to deeply equal values. Comparing if they're "the same map object" is done in the way described earlier, which seems exactly what you're looking for. On Tuesday, July 18, 2023 at 11:44:53 AM UTC-4 Jason Phillips wrote: > reflect.Value.UnsafePointer() is probably not safer than using unsafe > directly, assuming you're using unsafe in a way that doesn't break the > rules. Reflect is doing effectively the same unsafe.Pointer conversion > under the hood [1]. It's certainly easier on the eyes, in my opinion, > though. > > [1] - > https://cs.opensource.google/go/go/+/refs/tags/go1.20.6:src/reflect/value.go;l=103 > > On Tuesday, July 18, 2023 at 11:25:42 AM UTC-4 Stephen Illingworth wrote: > >> >> I like that. I think it's is quite a smart way of doing it, >> >> I don't think you need to check both maps when choosing a key. Once >> you've found a candidate key in one map, you can test the other map and if >> it *does* exist then the two maps aren't equal. You've then saved the >> insertion and deletion step. I would also prefer to use rand.Int() rather >> than a linear search. >> >> https://go.dev/play/p/ftBGgQMuvvC >> >> >> On Tuesday, 18 July 2023 at 15:35:38 UTC+1 Jochen Voss wrote: >> >>> Dear all, >>> >>> To implement the "eq" operator in a simple PostScript interpreter, I >>> need to determine whether two maps are the same object. >>> >>> This can be done by adding a new element to one map, and checking >>> whether the new entry also appears in the second map, but as you can >>> imagine, the resulting code is quite ugly. See >>> https://go.dev/play/p/AfembYDt3en for an implementation of this idea. >>> >>> Is there a better way? >>> >>> Many thanks, >>> Jochen >>> >>> -- 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/39c875f5-fa20-4c19-8028-e1eceb9b2818n%40googlegroups.com.
