COVIDSafe code from version 1.1

CovidSafe/Feedback/Sources/Outcome.swift

@@ -0,0 +1,35 @@
+//  Copyright © 2020 Australian Government All rights reserved.
+
+import Foundation
+
+public typealias VoidOutcome = Outcome<Void>
+
+public enum Outcome<T> {
+  case success(T)
+  case error(Error)
+  case cancelled
+
+  public init(resultOrNil: T?, errorOrNil: Error?) {
+    if let error = errorOrNil {
+      self = .error(error)
+      return
+    }
+    if let result = resultOrNil {
+      self = .success(result)
+      return
+    }
+    self = .error(ProgrammerError.encounteredNilResultAndNilErrorOutcome)
+  }
+
+  public init<A>(somethingOrNothing: A?, resultIfSomething: T, errorIfNothing: Error) {
+    if somethingOrNothing != nil {
+      self = .success(resultIfSomething)
+    } else {
+      self = .error(errorIfNothing)
+    }
+  }
+}
+
+enum ProgrammerError: Error {
+  case encounteredNilResultAndNilErrorOutcome
+}