diff options
Diffstat (limited to '')
-rw-r--r-- | src/test/ui/generic-associated-types/iterable.rs | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/src/test/ui/generic-associated-types/iterable.rs b/src/test/ui/generic-associated-types/iterable.rs new file mode 100644 index 000000000..af0049891 --- /dev/null +++ b/src/test/ui/generic-associated-types/iterable.rs @@ -0,0 +1,46 @@ +#![feature(generic_associated_types)] + +// run-pass + +trait Iterable { + type Item<'a> where Self: 'a; + type Iter<'a>: Iterator<Item = Self::Item<'a>> where Self: 'a; + + fn iter<'a>(&'a self) -> Self::Iter<'a>; +} + +// Impl for struct type +impl<T> Iterable for Vec<T> { + type Item<'a> = <std::slice::Iter<'a, T> as Iterator>::Item where T: 'a; + type Iter<'a> = std::slice::Iter<'a, T> where T: 'a; + + fn iter<'a>(&'a self) -> Self::Iter<'a> { + self[..].iter() + } +} + +// Impl for a primitive type +impl<T> Iterable for [T] { + type Item<'a> = <std::slice::Iter<'a, T> as Iterator>::Item where T: 'a; + type Iter<'a> = std::slice::Iter<'a, T> where T: 'a; + + fn iter<'a>(&'a self) -> Self::Iter<'a> { + self.iter() + } +} + +fn make_iter<'a, I: Iterable + ?Sized>(it: &'a I) -> I::Iter<'a> { + it.iter() +} + +fn get_first<'a, I: Iterable + ?Sized>(it: &'a I) -> Option<I::Item<'a>> { + it.iter().next() +} + +fn main() { + let v = vec![1, 2, 3]; + assert_eq!(v, make_iter(&v).copied().collect::<Vec<_>>()); + assert_eq!(v, make_iter(&*v).copied().collect::<Vec<_>>()); + assert_eq!(Some(&1), get_first(&v)); + assert_eq!(Some(&1), get_first(&*v)); +} |