Trait equivalent::Comparable

source ·
pub trait Comparable<K: ?Sized>: Equivalent<K> {
    // Required method
    fn compare(&self, key: &K) -> Ordering;
Expand description

Key ordering trait.

This trait allows ordered map lookup to be customized. It has one blanket implementation that uses the regular solution with Borrow and Ord, just like BTreeMap does, so that you can pass &str to lookup into a map with String keys and so on.

Required Methods§


fn compare(&self, key: &K) -> Ordering

Compare self to key and return their ordering.



impl<Q, K> Comparable<K> for Q
where Q: Ord + ?Sized, K: Borrow<Q> + ?Sized,