| use core::iter::*; |
| |
| #[test] |
| fn test_cloned() { |
| let xs = [2, 4, 6, 8]; |
| |
| let mut it = xs.iter().cloned(); |
| assert_eq!(it.len(), 4); |
| assert_eq!(it.next(), Some(2)); |
| assert_eq!(it.len(), 3); |
| assert_eq!(it.next(), Some(4)); |
| assert_eq!(it.len(), 2); |
| assert_eq!(it.next_back(), Some(8)); |
| assert_eq!(it.len(), 1); |
| assert_eq!(it.next_back(), Some(6)); |
| assert_eq!(it.len(), 0); |
| assert_eq!(it.next_back(), None); |
| } |
| |
| #[test] |
| fn test_cloned_side_effects() { |
| let mut count = 0; |
| { |
| let iter = [1, 2, 3] |
| .iter() |
| .map(|x| { |
| count += 1; |
| x |
| }) |
| .cloned() |
| .zip(&[1]); |
| for _ in iter {} |
| } |
| assert_eq!(count, 2); |
| } |
| |
| #[test] |
| fn test_cloned_try_folds() { |
| let a = [1, 2, 3, 4, 5, 6, 7, 8, 9]; |
| let f = &|acc, x| i32::checked_add(2 * acc, x); |
| let f_ref = &|acc, &x| i32::checked_add(2 * acc, x); |
| assert_eq!(a.iter().cloned().try_fold(7, f), a.iter().try_fold(7, f_ref)); |
| assert_eq!(a.iter().cloned().try_rfold(7, f), a.iter().try_rfold(7, f_ref)); |
| |
| let a = [10, 20, 30, 40, 100, 60, 70, 80, 90]; |
| let mut iter = a.iter().cloned(); |
| assert_eq!(iter.try_fold(0_i8, |acc, x| acc.checked_add(x)), None); |
| assert_eq!(iter.next(), Some(60)); |
| let mut iter = a.iter().cloned(); |
| assert_eq!(iter.try_rfold(0_i8, |acc, x| acc.checked_add(x)), None); |
| assert_eq!(iter.next_back(), Some(70)); |
| } |
