fn try_cmp_by()

in gazebo/src/ext/iter.rs [304:334]

• 28 lines of code
• 3 McCabe index (conditional complexity)

    fn try_cmp_by<O, F, E>(mut self, other: O, mut cmp: F) -> Result<Ordering, E>
    where
        Self: Sized,
        O: IntoIterator,
        F: FnMut(Self::Item, O::Item) -> Result<Ordering, E>,
    {
        let mut other = other.into_iter();

        loop {
            let x = match self.next() {
                None => {
                    if other.next().is_none() {
                        return Ok(Ordering::Equal);
                    } else {
                        return Ok(Ordering::Less);
                    }
                }
                Some(val) => val,
            };

            let y = match other.next() {
                None => return Ok(Ordering::Greater),
                Some(val) => val,
            };

            match cmp(x, y)? {
                Ordering::Equal => {}
                non_eq => return Ok(non_eq),
            }
        }
    }