public IDisposable Subscribe(IObserver <T> observer)
{
if (observer == null)
{
throw new ArgumentNullException(nameof(observer));
}
if (_error != null)
{
observer.OnError(_error);
return(Disposable.Nop);
}
if (_completed)
{
observer.OnCompleted();
return(Disposable.Nop);
}
Observers.Add(observer);
return(Delegate.Disposable(() =>
{
var observers = Observers;
// Could do the following to find the index of the
// the observer:
//
// var i = observers.FindIndex(o => o == observer);
//
// but it would require a closure allocation.
for (var i = 0; i < observers.Count; i++)
{
if (observers[i] == observer)
{
if (_shouldDeleteObserver)
{
observers[i] = null;
}
else
{
observers.RemoveAt(i);
}
break;
}
}
}));
}
public IDisposable Subscribe(IObserver <T> observer)
{
if (observer == null)
{
throw new ArgumentNullException(nameof(observer));
}
if (_error != null)
{
observer.OnError(_error);
return(Disposable.Nop);
}
if (_completed)
{
observer.OnCompleted();
return(Disposable.Nop);
}
Observers.Add(observer);
return(Delegate.Disposable(() => Observers.Remove(observer)));
}