Hello,
Using "golang.org/x/text/language" I have a map of
type map[language.Tag]int. I would like to get the keys present in my
map. Why does the following command not work?
import "golang.org/x/exp/maps"
...
var x map[language.Tag]int
...
fmt.Println(maps.Keys(x))
The error message is "Tag does not implement comparable". Code on the
playground: https://go.dev/play/p/dsyEt0ClDBH .
The following function does work as expected, so this is easy to work
around:
func myKeys(m map[language.Tag]int) []language.Tag {
var res []language.Tag
for key := range m {
res = append(res, key)
}
return res
}
But I wonder now whether it is unwise to use language.Tag for the keys in a
map, and why maps.Keys() requires the keys to implement "comparable" in
addition to the constraint "M ~map[K]V".
Many thanks,
Jochen
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