CmpOrder

Simple Macros to implement prioritized Ord/PartialOrd

Examples

cmp_order

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
struct ABC {
    a: u8,
    b: u8,
}

impl Ord for ABC {
    fn cmp(&self, other: &Self) -> std::cmp::Ordering {
        // priority:
        // 1) self.a.cmp(&other.a)
        // 2) self.b.cmp(&other.b)
        cmp_order!(self.a.cmp(&other.a), self.b.cmp(&other.b))
    }
}

impl PartialOrd for ABC {
    fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
        Some(self.cmp(other))
    }
}

partial_cmp_order

impl PartialOrd for ABC {
    fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
        // priority:
        // 1) self.a.partial_cmp(&other.a)
        // 2) self.b.partial_cmp(&other.b)
        partial_cmp_order!(self.a.partial_cmp(&other.a), self.b.partial_cmp(&other.b))
    }
}