If I understand things correctly, you *can* make uuid a let because you’re
allowed to set them (once) during init functions.
- Dave Sweeris
> On Aug 2, 2016, at 6:22 PM, Rick Mann via swift-users <swift-users@swift.org>
> wrote:
>
> I'm trying to define a protocol that has a read-only, immutable member "uuid"
> that can be set in the init() method, but I'm having trouble. I have this:
>
> protocol
> Element
> {
> var uuid : { get }
> }
>
> extension
> Element
> {
> init(...)
> {
> self.uuid = ...
> }
> }
>
> I can't make it let, because they're computed.
>
> I'm realizing from other stuff that I really can't have the init(...) method
> in the extension, anyway. But I'd really like to be able to specify a let
> member in the protocol. What's the best way to have that effect?
>
> In my semantics, an Element has a uniquely-assigned uuid. It might be
> generated when the object is instantiated, or it might be deserialized from
> disk, but once that's done, it can never change. How do I express that?
>
> Thanks,
>
> --
> Rick Mann
> rm...@latencyzero.com
>
>
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