# asFuture<E> method

Future<E> asFuture <E>([E futureValue ])

Returns a future that handles the onDone and onError callbacks.

This method overwrites the existing onDone and onError callbacks with new ones that complete the returned future.

In case of an error the subscription will automatically cancel (even when it was listening with `cancelOnError` set to `false`).

In case of a `done` event the future completes with the given `futureValue`.

## Implementation

    Future<E> asFuture<E>([E futureValue]);