nested function의 객체 소유권 삽질

main.swift

import Foundation

class Dummy {
    private let name = "Dummy"
}

final class SomeClass {

    private let dodoService = DoDoService()

    private let dummy = Dummy()

    init() {
        print(aa, "initialized")
    }

    deinit {
        print(self, "deinitialized")
    }

    func aa() {
        func nested() {
            printing()
        }

//        DoService.shared.doLater {
//            nested()
//        }
        dodoService.dodoLater {
//            nested()
            self.printing()
        }
    }

    func printing() {
        print(dummy)
    }
}

final class DoService {
    static let shared = DoService()
    private init() {}

    func doLater(completion: @escaping () -> Void) {
        DispatchQueue.global().asyncAfter(deadline: .now() + 2) {
            completion()
        }
    }
}
final class DoDoService {
    init() {}

    func dodoLater(completion: @escaping () -> Void) {
        DispatchQueue.global().asyncAfter(deadline: .now() + 2) {
            completion()
            completion()
        }
    }
}

final class Flow {
    init() {
        start()
    }

    func start() {
        let t = SomeClass()
        t.aa()
    }
}
let flow = Flow()

RunLoop.main.run()