delete abstract method
Removes (but does not dispose) the given disposable if it is part of this container.
disposable
must be a StreamSubscription or a Sink.
Returns true
if disposable
was in this bag, and false
if not.
The method has no effect if disposable
was not in this bag.
Throws DisposedException or ClearingException if this bag has been disposed or is disposing.
Implementation
bool delete(Object disposable);