Function permutator::large_combination

pub fn large_combination<'a, T, F>(domain: &'a [T], r: usize, cb: F) where
    T: 'a,
    for<'r> F: FnMut(&'r [&'a T]) + 'a, 

Generate a r-combination from given domain and call callback function on each combination.

Parameter

1. domain : &[T] - A slice contain a domain to generate r-combination
2. r : usize - A size of combination
3. cb : FnMut(&[&T]) - A callback that return each combination

Panic

It panic when r > domain.len()