Future!T that can be cancelled via token.Future.withCancel
Future!T withCancel(CancelToken token) @trustedAttach an external cancellation token to this future.
If the token is already cancelled, the returned future is cancelled immediately. Otherwise, the returned future mirrors this future's result (resolve, reject, or cancel) unless the token fires first, in which case the returned future is cancelled.
Parameters
token | External cancellation token to observe. |
Returns
A new