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
[email protected]
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