Jakub Kotur | a425e55 | 2020-12-21 17:28:15 +0100 | [diff] [blame] | 1 | use itertools::Itertools; |
| 2 | |
| 3 | #[test] |
| 4 | fn tuples() { |
| 5 | let v = [1, 2, 3, 4, 5]; |
| 6 | let mut iter = v.iter().cloned().tuples(); |
| 7 | assert_eq!(Some((1,)), iter.next()); |
| 8 | assert_eq!(Some((2,)), iter.next()); |
| 9 | assert_eq!(Some((3,)), iter.next()); |
| 10 | assert_eq!(Some((4,)), iter.next()); |
| 11 | assert_eq!(Some((5,)), iter.next()); |
| 12 | assert_eq!(None, iter.next()); |
| 13 | assert_eq!(None, iter.into_buffer().next()); |
| 14 | |
| 15 | let mut iter = v.iter().cloned().tuples(); |
| 16 | assert_eq!(Some((1, 2)), iter.next()); |
| 17 | assert_eq!(Some((3, 4)), iter.next()); |
| 18 | assert_eq!(None, iter.next()); |
| 19 | itertools::assert_equal(vec![5], iter.into_buffer()); |
| 20 | |
| 21 | let mut iter = v.iter().cloned().tuples(); |
| 22 | assert_eq!(Some((1, 2, 3)), iter.next()); |
| 23 | assert_eq!(None, iter.next()); |
| 24 | itertools::assert_equal(vec![4, 5], iter.into_buffer()); |
| 25 | |
| 26 | let mut iter = v.iter().cloned().tuples(); |
| 27 | assert_eq!(Some((1, 2, 3, 4)), iter.next()); |
| 28 | assert_eq!(None, iter.next()); |
| 29 | itertools::assert_equal(vec![5], iter.into_buffer()); |
| 30 | } |
| 31 | |
| 32 | #[test] |
| 33 | fn tuple_windows() { |
| 34 | let v = [1, 2, 3, 4, 5]; |
| 35 | |
| 36 | let mut iter = v.iter().cloned().tuple_windows(); |
| 37 | assert_eq!(Some((1,)), iter.next()); |
| 38 | assert_eq!(Some((2,)), iter.next()); |
| 39 | assert_eq!(Some((3,)), iter.next()); |
| 40 | |
| 41 | let mut iter = v.iter().cloned().tuple_windows(); |
| 42 | assert_eq!(Some((1, 2)), iter.next()); |
| 43 | assert_eq!(Some((2, 3)), iter.next()); |
| 44 | assert_eq!(Some((3, 4)), iter.next()); |
| 45 | assert_eq!(Some((4, 5)), iter.next()); |
| 46 | assert_eq!(None, iter.next()); |
| 47 | |
| 48 | let mut iter = v.iter().cloned().tuple_windows(); |
| 49 | assert_eq!(Some((1, 2, 3)), iter.next()); |
| 50 | assert_eq!(Some((2, 3, 4)), iter.next()); |
| 51 | assert_eq!(Some((3, 4, 5)), iter.next()); |
| 52 | assert_eq!(None, iter.next()); |
| 53 | |
| 54 | let mut iter = v.iter().cloned().tuple_windows(); |
| 55 | assert_eq!(Some((1, 2, 3, 4)), iter.next()); |
| 56 | assert_eq!(Some((2, 3, 4, 5)), iter.next()); |
| 57 | assert_eq!(None, iter.next()); |
| 58 | |
| 59 | let v = [1, 2, 3]; |
| 60 | let mut iter = v.iter().cloned().tuple_windows::<(_, _, _, _)>(); |
| 61 | assert_eq!(None, iter.next()); |
| 62 | } |
| 63 | |
| 64 | #[test] |
| 65 | fn next_tuple() { |
| 66 | let v = [1, 2, 3, 4, 5]; |
| 67 | let mut iter = v.iter(); |
| 68 | assert_eq!(iter.next_tuple().map(|(&x, &y)| (x, y)), Some((1, 2))); |
| 69 | assert_eq!(iter.next_tuple().map(|(&x, &y)| (x, y)), Some((3, 4))); |
| 70 | assert_eq!(iter.next_tuple::<(_, _)>(), None); |
| 71 | } |
| 72 | |
| 73 | #[test] |
| 74 | fn collect_tuple() { |
| 75 | let v = [1, 2]; |
| 76 | let iter = v.iter().cloned(); |
| 77 | assert_eq!(iter.collect_tuple(), Some((1, 2))); |
| 78 | |
| 79 | let v = [1]; |
| 80 | let iter = v.iter().cloned(); |
| 81 | assert_eq!(iter.collect_tuple::<(_, _)>(), None); |
| 82 | |
| 83 | let v = [1, 2, 3]; |
| 84 | let iter = v.iter().cloned(); |
| 85 | assert_eq!(iter.collect_tuple::<(_, _)>(), None); |
| 86 | } |