pipecircuit 0.0.23

Correct. Robust. Fast. Portable. Pick four.
Documentation 
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pub trait Reactor {
    type Reaction;
    type Failure;

    fn wait_for_reaction(&mut self) -> Result<Self::Reaction, Self::Failure>;
}

#[cfg(test)]
mod tests {
    use super::*;

    struct SequenceReactor {
        next: u8,
    }

    impl Reactor for SequenceReactor {
        type Reaction = u8;
        type Failure = core::convert::Infallible;

        fn wait_for_reaction(&mut self) -> Result<Self::Reaction, Self::Failure> {
            let reaction = self.next;
            self.next = self.next.saturating_add(1);
            Ok(reaction)
        }
    }

    #[test]
    fn reactors_emit_one_physical_reaction_at_a_time() {
        let mut reactor = SequenceReactor { next: 3 };

        assert_eq!(reactor.wait_for_reaction(), Ok(3));
        assert_eq!(reactor.wait_for_reaction(), Ok(4));
    }
}