iterator exponentiator.cs

class Exponentiator {
    public static IEnumerator Coroutine(Coordinator<int[]> coordinator) {
        while(true) {
            if(coordinator.State == null) {
                continue;
            }
            if(coordinator.State.Length == 0) {
                Console.WriteLine("consumer finished, end of input");
                yield break;
            }
            for(int i = 0; i < coordinator.State.Length; i++) {
                var item = coordinator.State[i];
                coordinator.State[i] = item * item;
            }
            yield return coordinator;
        }
    }
}