An asynchronous operation that can be cancelled.
The value of this operation is exposed as value. When this operation is cancelled, value won't complete either successfully or with an error. If value has already completed, cancelling the operation does nothing.
) → Stream< T>
- Creates a Stream containing the result of this operation. [...]
) → Future
- Cancels this operation. [...]
[T cancellationValue ]) → Future
- Creates a Future that completes when this operation completes or when it's cancelled. [...]
Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed. [...]
) → String
Returns a string representation of this object.