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import Foundation | |
/// An abstract class that makes building simple asynchronous operations easy. | |
/// Subclasses must implement `execute()` to perform any work and call | |
/// `finish()` when they are done. All `NSOperation` work will be handled | |
/// automatically. | |
open class AsynchronousOperation: Operation { | |
// MARK: - Properties |
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import Foundation | |
import Result | |
public extension Result { | |
/// Constructs a success wrapping `value`, iff `value` is not nil and `error` is nil. | |
/// | |
/// Constructs a failure wrapping `error`, iff `error` is not nil and `value` is nil. | |
/// | |
/// Otherwise, returns nil. |