Enum State 

pub enum State<'a, T> {
    New,
    NoHandler,
    HasHandler(Box<dyn FnOnce(T) + 'a>),
    Completed,
}

Internal state of Eager.

Variants

New

Handler hasn’t been setup yet. Eager shouldn’t be completed in this state.

NoHandler

Do nothing when the Eager completes.

HasHandler(Box<dyn FnOnce(T) + 'a>)

Call a FnOnce when the Eager completes.

Completed

Eager has completed and handler (if any) has been called.