gistfile1.rs

// match

fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
    match (self.x.partial_cmp(&other.x), self.y.partial_cmp(&other.y), self.z.partial_cmp(&other.z), self.w.partial_cmp(&other.w)) {
        (Some(Ordering::Less), Some(Ordering::Less), Some(Ordering::Less), Some(Ordering::Less)) => Some(Ordering::Less),
        (Some(Ordering::Greater), Some(Ordering::Greater), Some(Ordering::Greater), Some(Ordering::Greater)) => Some(Ordering::Greater),
        (Some(Ordering::Equal), Some(Ordering::Equal), Some(Ordering::Equal), Some(Ordering::Equal)) => Some(Ordering::Equal),
        _ => None
    }
}


// if else

fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
    if self.x < other.x && self.y < other.y && self.z < other.z && self.w < other.w {
        Some(Ordering::Less)
    } else if self.x > other.x && self.y > other.y && self.z > other.z && self.w > other.w {
        Some(Ordering::Greater)
    } else if self == other {
        Some(Ordering::Equal)
    } else {
        None
    }
}