Function ironsort::quicksort_by

pub fn quicksort_by<T: PartialOrd, F>(vec: &mut [T], cmp: &F) where
    F: Fn(&T, &T) -> Ordering, 

In-place sorting of a slice of T using a custom comparison function.

let presorted: Vec<u64> = vec![9, 6, 5, 5, 4, 3, 3, 2, 1, 1];
let mut vector: Vec<u64> = vec![3, 1, 4, 1, 5, 9, 2, 6, 5, 3];

quicksort_by(&mut vector, &|x, y| x.cmp(y).reverse());

assert_eq!(vector, presorted.as_slice());