| use core::iter::*; |
| |
| #[test] |
| fn test_fuse_nth() { |
| let xs = [0, 1, 2]; |
| let mut it = xs.iter(); |
| |
| assert_eq!(it.len(), 3); |
| assert_eq!(it.nth(2), Some(&2)); |
| assert_eq!(it.len(), 0); |
| assert_eq!(it.nth(2), None); |
| assert_eq!(it.len(), 0); |
| } |
| |
| #[test] |
| fn test_fuse_last() { |
| let xs = [0, 1, 2]; |
| let it = xs.iter(); |
| |
| assert_eq!(it.len(), 3); |
| assert_eq!(it.last(), Some(&2)); |
| } |
| |
| #[test] |
| fn test_fuse_count() { |
| let xs = [0, 1, 2]; |
| let it = xs.iter(); |
| |
| assert_eq!(it.len(), 3); |
| assert_eq!(it.count(), 3); |
| // Can't check len now because count consumes. |
| } |
| |
| #[test] |
| fn test_fuse_fold() { |
| let xs = [0, 1, 2]; |
| let it = xs.iter(); // `FusedIterator` |
| let i = it.fuse().fold(0, |i, &x| { |
| assert_eq!(x, xs[i]); |
| i + 1 |
| }); |
| assert_eq!(i, xs.len()); |
| |
| let it = xs.iter(); // `FusedIterator` |
| let i = it.fuse().rfold(xs.len(), |i, &x| { |
| assert_eq!(x, xs[i - 1]); |
| i - 1 |
| }); |
| assert_eq!(i, 0); |
| |
| let it = xs.iter().scan((), |_, &x| Some(x)); // `!FusedIterator` |
| let i = it.fuse().fold(0, |i, x| { |
| assert_eq!(x, xs[i]); |
| i + 1 |
| }); |
| assert_eq!(i, xs.len()); |
| } |
| |
| #[test] |
| fn test_fuse() { |
| let mut it = 0..3; |
| assert_eq!(it.len(), 3); |
| assert_eq!(it.next(), Some(0)); |
| assert_eq!(it.len(), 2); |
| assert_eq!(it.next(), Some(1)); |
| assert_eq!(it.len(), 1); |
| assert_eq!(it.next(), Some(2)); |
| assert_eq!(it.len(), 0); |
| assert_eq!(it.next(), None); |
| assert_eq!(it.len(), 0); |
| assert_eq!(it.next(), None); |
| assert_eq!(it.len(), 0); |
| assert_eq!(it.next(), None); |
| assert_eq!(it.len(), 0); |
| } |