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First async program [Swift]

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import Foundation

@main
struct Main{
    static var i:Int = 0
    static func f()->Int{
        i += 1
        let j = i
        print("async ",j)
        return j
    }
    actor A{
        var future:[Int] = Array(repeating: 0, count: 10)
        func set(_ index:Int,_ val:Int){
            future[index] = val
        }
        func get(_ index:Int)->Int{
            return future[index]
        }
        func run()async{
            await withTaskGroup(of: Void.self) { group in
                for i in 0..<10 {
                    group.addTask{
                        print("starting")
                        await self.set(i, f())
                    }
                }
            }
        }
        func collect(){
            for i in 0..<10 {
                print("result ",get(i))
            }
        }
    }
    static func main()async{
        print("entering main")
        let a = A()
        await a.run()
        await a.collect()
    }
}


-- 

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First async program [Swift] Branimir Maksimovic <branimir.maksimovic@icloud.com> - 2021-10-03 19:04 +0000

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