Type Definition futures::Poll

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pub type Poll<T, E> = Result<Async<T>, E>;

Expand description

Return type of the Future::poll method, indicates whether a future’s value is ready or not.

Ok(Async::Ready(t)) means that a future has successfully resolved
Ok(Async::NotReady) means that a future is not ready to complete yet
Err(e) means that a future has completed with the given failure