complete method

@override void complete([ FutureOr<T>? value ])

Completes future with the supplied values.

The value must be either a value of type T or a future of type Future<T>. If the value is omitted or null, and T is not nullable, the call to complete throws.

If the value is itself a future, the completer will wait for that future to complete, and complete with the same result, whether it is a success or an error.

Calling complete or completeError must be done at most once.

All listeners on the future are informed about the value.

Implementation

@override
void complete([FutureOr<T>? value]) {
  assert(
      _isStarted == true, "Completing a future that hasn't been started...");
  if (!_delegate.isCompleted) _delegate.complete(value);
}