pub fn unfold<I, T, Fut, Message>(
    id: I,
    initial: T,
    f: impl FnMut(T) -> Fut + MaybeSend + Sync + 'static
) -> Subscription<Message>where
    I: Hash + 'static,
    T: MaybeSend + 'static,
    Fut: Future<Output = (Message, T)> + MaybeSend + 'static,
    Message: 'static + MaybeSend,
Expand description

Returns a Subscription that will create and asynchronously run a [Stream] that will call the provided closure to produce every Message.

The id will be used to uniquely identify the Subscription.