memory_leak.swift

//: Playground - noun: a place where people can play

typealias CompletionBlock = (Bool) -> ()

class BlockStorage {

    var blocks = [CompletionBlock]()

    func addBlock(block: CompletionBlock) {
        blocks.append(block)
    }

    deinit {
        print("BlockStorage deinit")
    }

}

class Client {

    var blockStorage = BlockStorage()

    func start() {

        blockStorage.addBlock() { [unowned self](success: Bool) in
            print("\(self) First block")
        }

        blockStorage.addBlock() { [unowned self](success: Bool) in
            self.doSomeThing(success)
        }

    }

    func doSomeThing(success: Bool) {
        print("Do Something")
    }

    deinit {
        print("Client deinit")
    }

}

func playground()  {
    let client = Client()
    client.start()
}

playground()