4 type Item<'a> where Self: 'a;
5 type Iter<'a>: Iterator<Item = Self::Item<'a>> where Self: 'a;
7 fn iter<'a>(&'a self) -> Self::Iter<'a>;
10 // Impl for struct type
11 impl<T> Iterable for Vec<T> {
12 type Item<'a> = <std::slice::Iter<'a, T> as Iterator>::Item where T: 'a;
13 type Iter<'a> = std::slice::Iter<'a, T> where T: 'a;
15 fn iter<'a>(&'a self) -> Self::Iter<'a> {
20 // Impl for a primitive type
21 impl<T> Iterable for [T] {
22 type Item<'a> = <std::slice::Iter<'a, T> as Iterator>::Item where T: 'a;
23 type Iter<'a> = std::slice::Iter<'a, T> where T: 'a;
25 fn iter<'a>(&'a self) -> Self::Iter<'a> {
30 fn make_iter<'a, I: Iterable + ?Sized>(it: &'a I) -> I::Iter<'a> {
34 fn get_first<'a, I: Iterable + ?Sized>(it: &'a I) -> Option<I::Item<'a>> {
39 let v = vec![1, 2, 3];
40 assert_eq!(v, make_iter(&v).copied().collect::<Vec<_>>());
41 assert_eq!(v, make_iter(&*v).copied().collect::<Vec<_>>());
42 assert_eq!(Some(&1), get_first(&v));
43 assert_eq!(Some(&1), get_first(&*v));