For more information about optional chaining read this docs:
https://developer.apple.com/library/content/documentation/Swift/Conceptual/Swift_Programming_Language/OptionalChaining.html
--
Adrian Zubarev
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Am 8. Februar 2017 um 20:05:31, Adrian Zubarev
(adrian.zuba...@devandartist.com) schrieb:
Swift does already have a great solution in such a scenario.
func handler() -> Result? {
return callback?.result()
}
Does the trick. ;)
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Adrian Zubarev
Sent with Airmail
Am 8. Februar 2017 um 20:02:38, Maxim Veksler (ma...@vekslers.org) schrieb:
For example, assume that we're dealing with a callback of some form.
let callback: CallbackProtocol? = StructExampleCallback()
You could write inside you handler function:
func handler() -> Result? {
return callback ?! callback.result() : nil
}
Which would return either nil, or the callback result. I don't think you can do
it with ?? but then again guard is a valid solution for this specific use case.
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