Comments (2)
Signals have to be classes so they can be referenced (classes are reference types, structs are not).
let a = Signal<String>()
func doSomething(s: Signal<String>) {
s.next { string in
// do something important
}
}
doSomething(a)
a.update("Hello")
If Signal would be a value type, doSomething
wouldn't be able to change it (it could declare s
as inout mutable
, but that just breaks the whole concept of sane dependencies). Therefore the signal couldn't add the func as a subscriber and also it cannot call it back. s
would never update and call their subscribers, because it would be a different instance than a
.
So no, signal could not be a struct.
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Thanks!
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