On Tuesday, February 14, 2017 at 2:28:50 PM UTC, Rupert Smith wrote:
>
> Is there some way to avoid this, perhaps using extensible records?
>
I was kind of hoping something like this might work, but it doesn't:
type alias Positioned a =
{ a | rect : Rectangle }
type alias WithContent a =
{ a | content : Maybe String }
type State
= Hidden {}
| Aware (Positioned {})
| Active (Positioned (WithContent {}))
| Inactive (Positioned (WithContent {}))
toActive state =
case state of
Aware position -> Active { position | content = Just "test" }
_ -> state
I can't just add more fields to a record type with this: { position |
content = Just "test" }, so I guess I have to manually copy over the fields.
--
You received this message because you are subscribed to the Google Groups "Elm
Discuss" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
For more options, visit https://groups.google.com/d/optout.
