I need to do something like this:
func withPredicateErrors<Element, Return>(_ predicate: (Element) throws
-> Bool, do body: ((Element) -> Bool) -> Return) rethrows -> Return {
var caught: Error?
let value = body { elem in
do {
return try predicate(elem)
}
catch {
caught = error
return true // Terminate search
}
}
if let caught = caught {
throw caught
}
else {
return value
}
}
The problem is, the Swift compiler doesn't allow the explicit `throw`
statement; even though it can only throw errors originally thrown by
`predicate`, the compiler is not smart enough to prove that to itself. I cannot
make `body` a `throws` function.
Is there any way to do this? Either to override the compiler's safety check, or
to rewrite this function to avoid it?
--
Brent Royal-Gordon
Architechies
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