public static IEnumerator Skip(int frames, IteratorTasks.CancellationToken ct)
{
for (int i = 0; i < frames; i++)
{
ct.ThrowIfCancellationRequested();
yield return(null);
}
}
public static Task Delay(int milliSecond, IteratorTasks.CancellationToken ct, TaskScheduler scheduler)
{
var tcs = new TaskCompletionSource <object>(scheduler);
Timer timer = null;
timer = new Timer(_ =>
{
timer.Dispose();
tcs.SetResult(null);
}, null, milliSecond, Timeout.Infinite);
ct.Register(() =>
{
timer.Dispose();
tcs.SetCanceled();
});
return(tcs.Task);
}
/// <summary>
/// n フレーム後に F1(x)を返すコルーチン。
/// キャンセル機能付き。
/// </summary>
/// <param name="x">入力値。</param>
/// <param name="n">コルーチン稼働のフレーム数。</param>
/// <param name="completed">完了時に呼ばれるデリゲート。</param>
/// <param name="ct">キャンセル用トークン。</param>
/// <returns></returns>
public static System.Collections.IEnumerator F1Cancelable(double x, int n, Action<double> completed, CancellationToken ct)
{
for (int i = 0; i < n; i++)
{
// キャンセルへの対処はあくまでコルーチン側の債務
// 例外を出して止める。
ct.ThrowIfCancellationRequested();
yield return null;
}
completed(F1(x));
}
public static Task Delay(int milliSecond, IteratorTasks.CancellationToken ct)
{
return(Delay(milliSecond, ct, Task.DefaultScheduler));
}
public static Task DelayFrame(int frames, IteratorTasks.CancellationToken ct, TaskScheduler scheduler)
{
return(Task.Run(Skip(frames, ct), scheduler));
}
/// <summary>
/// 初期化。
/// </summary>
public CancellationTokenSource()
{
Token = new CancellationToken(this);
}
static System.Collections.IEnumerator Cancelで戻り値が切り替わるコルーチン(int n, Action<string> completed, CancellationToken ct)
{
var message = CompletedMessage;
ct.Register(() =>
{
message = CanceledMessage;
});
for (int i = 0; i < n; i++)
{
if (ct.IsCancellationRequested)
break;
yield return null;
}
completed(message);
}
