public IDisposable Subscribe(IObserver <bool> observer)
{
var disposer = new SubscribeDisposer(this, observer);
IObserver <bool>[]? previousObservers = null;
IObserver <bool>[]? nextObservers = null;
do
{
previousObservers = observers;
var nextLength = previousObservers is null ? 1 : previousObservers.Length + 1;
nextObservers = new IObserver <bool> [nextLength];
previousObservers?.CopyTo(nextObservers, 0);
nextObservers[nextLength - 1] = observer;
} while (!ReferenceEquals(Interlocked.CompareExchange(ref observers, nextObservers, previousObservers), previousObservers));
if (pushValueAtSubscribe)
{
observer.OnNext(IsEntered);
}
return(disposer);
}
