pub fn binary_search_slice<'d, E, K>( data: &'d [E], key_fn: impl Fn(&E) -> K, key: &K ) -> &'d [E]where K: Ord,
Uses a sorted slice
data: &[E] as a kind of “multi-map”. The
key_fn extracts a key of type
K from the data, and this
function finds the range of elements that match the key.
must have been sorted as if by a call to
sort_by_key for this to