How about?
public func ?? <T>(optional: T?, noreturnOrError: @autoclosure () throws ->
Never) rethrows -> T {
switch optional {
case .some(let value):
return value
case .none:
try noreturnOrError()
}
}
--
Adrian Zubarev
Sent with Airmail
Am 27. Juni 2017 um 21:54:57, Max Moiseev via swift-evolution
([email protected]) schrieb:
On Jun 27, 2017, at 10:38 AM, Xiaodi Wu via swift-evolution
<[email protected]> wrote:
As you write, this operator becomes sugar for “?? fatalError()” once Never
becomes a true bottom type.
In the meantime, can’t the same thing be accomplished by overloading fatalError
so it’s a generic function that returns a discardable result of type T, which
in turn calls the Never-returning overload?
I like this idea more than adding an extra operator, but overloading fatalError
won’t work now because of
https://github.com/apple/swift/blob/master/stdlib/public/core/Optional.swift#L668
On Tue, Jun 27, 2017 at 12:25 Erica Sadun via swift-evolution
<[email protected]> wrote:
Using an operator to provide feedback on the context of a failed unwrap has
become a commonly implemented approach in the Swift developer Community. What
are your thoughts about adopting this widely-used operator into the standard
library?
guard !lastItem.isEmpty else { return }
let lastItem = array.last !! "Array must be non-empty"
Details here: https://gist.github.com/erica/423e4b1c63b95c4c90338cdff4939a9b
Thank you for your thoughtful feedback, -- E
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