protected override IDisposable SubscribeCore(IObserver <Unit> observer, IDisposable cancel)
{
var fe = new FromEvent(this, observer);
return(fe.Register() ? fe : Disposable.Empty);
}
protected override IDisposable SubscribeCore(UniRx.IObserver <T> observer, IDisposable cancel)
{
FromEvent fromEvent = new FromEvent(this, observer);
return((!fromEvent.Register()) ? Disposable.Empty : fromEvent);
}