public override StreamSubscription <T> listen(Action <T> onData,
Action <object, string> onError = null, Action onDone = null, bool cancelOnError = false)
{
//cancelOnError = cancelOnError;
StreamSubscription <T> result = _onListen(_stream, cancelOnError);
result.onData(onData);
result.onError(onError);
result.onDone(onDone);
return(result);
}
public CastStreamSubscription(StreamSubscription <S> _source)
{
this._source = _source;
_source.onData(_onData);
}