On 6 February 2018 at 21:25, <matthewju...@gmail.com> wrote: > What do you mean by a "slice pointer key" ? > > > map[*[]Something]string > > Then map consumers can do key comparisons. I originally used this for an > unordered set type. >
I'm sure you are aware of the distinction but it might not be clear for others reading: this does "byte slice identity", but doesn't actually compare the contents of slices. Consider https://play.golang.org/p/gjZx8nGK8EB : foo := []int{1, 2, 3} bar := []int{1, 2, 3} m := map[*[]int]bool{} m[&foo] = true m[&bar] = true Then you'd have len(m) == 2, even though foo and bar are the same. The neat thing about rog's trick is that in that case you'd only have one: the two slices would be equal owing to their contents, not where the slice happens to live in memory (not to be confused with "where the backing array of the slice lives in memory"). -- 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. For more options, visit https://groups.google.com/d/optout.
