core/slice/
specialize.rs

1pub(super) trait SpecFill<T> {
2    fn spec_fill(&mut self, value: T);
3}
4
5impl<T: Clone> SpecFill<T> for [T] {
6    default fn spec_fill(&mut self, value: T) {
7        if let Some((last, elems)) = self.split_last_mut() {
8            for el in elems {
9                el.clone_from(&value);
10            }
11
12            *last = value
13        }
14    }
15}
16
17impl<T: Copy> SpecFill<T> for [T] {
18    fn spec_fill(&mut self, value: T) {
19        for item in self.iter_mut() {
20            *item = value;
21        }
22    }
23}