+1 I had a slightly different implementation.
https://gist.github.com/DevAndArtist/dad641ee833e60b02fd1db2dbb488c6a
//
// UnwrapOrTrap.swift
//
infix operator ?! : NilCoalescingPrecedence
/// Performs a nil-coalescing operation, returning the wrapped value of an
/// `Optional` instance or uses the rhs function to stop the program.
///
/// - Parameters:
/// - optional: An optional value.
/// - noreturn: A function to stop the programm.
func ?!<T>(optional: T?, noreturn: @autoclosure () -> Never) -> T {
switch optional {
case .some(let value):
return value
case .none:
noreturn()
}
}
--
Adrian Zubarev
Sent with Airmail
Am 27. Juni 2017 um 19:25:15, Erica Sadun via swift-evolution
([email protected]) schrieb:
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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