[swift-users] [swift-evolution] Best way to handle escaping function that might throw

Anton Zhilin antonyzhilin at gmail.com
Thu Jan 12 15:32:42 CST 2017

The best way to deal with such situations should be typed throws. Then
rethrows should be removed and replaced with generics in throws clause. E
== Never ⇔ function does not throw.

struct FStore<E> {
    let f: () throws(E) -> Void
    init(_ f: @escaping () throws(E) -> Void) { self.f = f }
    func call() throws(E) { try f() }

let store = FStore<Never>({ print("Hello") })

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