2 use std::cmp::Ordering::{self, Equal, Greater, Less};
6 use std::sync::atomic::{Ordering::Relaxed, AtomicUsize};
9 use rand::{Rng, RngCore, thread_rng};
10 use rand::seq::SliceRandom;
11 use rand::distributions::Standard;
13 fn square(n: usize) -> usize {
17 fn is_odd(n: &usize) -> bool {
23 // Test on-stack from_fn.
24 let mut v: Vec<_> = (0..3).map(square).collect();
27 assert_eq!(v.len(), 3);
33 // Test on-heap from_fn.
34 v = (0..5).map(square).collect();
37 assert_eq!(v.len(), 5);
48 // Test on-stack from_elem.
49 let mut v = vec![10, 10];
52 assert_eq!(v.len(), 2);
57 // Test on-heap from_elem.
72 let xs: [i32; 0] = [];
73 assert!(xs.is_empty());
74 assert!(![0].is_empty());
78 fn test_len_divzero() {
82 let v2: &[Z] = &[[], []];
83 assert_eq!(mem::size_of::<Z>(), 0);
84 assert_eq!(v0.len(), 0);
85 assert_eq!(v1.len(), 1);
86 assert_eq!(v2.len(), 2);
92 assert_eq!(a.get(1), None);
94 assert_eq!(a.get(1).unwrap(), &12);
96 assert_eq!(a.get(1).unwrap(), &12);
102 assert_eq!(a.first(), None);
104 assert_eq!(a.first().unwrap(), &11);
106 assert_eq!(a.first().unwrap(), &11);
110 fn test_first_mut() {
112 assert_eq!(a.first_mut(), None);
114 assert_eq!(*a.first_mut().unwrap(), 11);
116 assert_eq!(*a.first_mut().unwrap(), 11);
120 fn test_split_first() {
121 let mut a = vec![11];
123 assert!(b.split_first().is_none());
124 assert_eq!(a.split_first(), Some((&11, b)));
126 let b: &[i32] = &[12];
127 assert_eq!(a.split_first(), Some((&11, b)));
131 fn test_split_first_mut() {
132 let mut a = vec![11];
133 let b: &mut [i32] = &mut [];
134 assert!(b.split_first_mut().is_none());
135 assert!(a.split_first_mut() == Some((&mut 11, b)));
137 let b: &mut [_] = &mut [12];
138 assert!(a.split_first_mut() == Some((&mut 11, b)));
142 fn test_split_last() {
143 let mut a = vec![11];
145 assert!(b.split_last().is_none());
146 assert_eq!(a.split_last(), Some((&11, b)));
149 assert_eq!(a.split_last(), Some((&12, b)));
153 fn test_split_last_mut() {
154 let mut a = vec![11];
155 let b: &mut [i32] = &mut [];
156 assert!(b.split_last_mut().is_none());
157 assert!(a.split_last_mut() == Some((&mut 11, b)));
160 let b: &mut [_] = &mut [11];
161 assert!(a.split_last_mut() == Some((&mut 12, b)));
167 assert_eq!(a.last(), None);
169 assert_eq!(a.last().unwrap(), &11);
171 assert_eq!(a.last().unwrap(), &12);
177 assert_eq!(a.last_mut(), None);
179 assert_eq!(*a.last_mut().unwrap(), 11);
181 assert_eq!(*a.last_mut().unwrap(), 12);
186 // Test fixed length vector.
187 let vec_fixed = [1, 2, 3, 4];
188 let v_a = vec_fixed[1..vec_fixed.len()].to_vec();
189 assert_eq!(v_a.len(), 3);
191 assert_eq!(v_a[0], 2);
192 assert_eq!(v_a[1], 3);
193 assert_eq!(v_a[2], 4);
196 let vec_stack: &[_] = &[1, 2, 3];
197 let v_b = vec_stack[1..3].to_vec();
198 assert_eq!(v_b.len(), 2);
200 assert_eq!(v_b[0], 2);
201 assert_eq!(v_b[1], 3);
204 let vec_unique = vec![1, 2, 3, 4, 5, 6];
205 let v_d = vec_unique[1..6].to_vec();
206 assert_eq!(v_d.len(), 5);
208 assert_eq!(v_d[0], 2);
209 assert_eq!(v_d[1], 3);
210 assert_eq!(v_d[2], 4);
211 assert_eq!(v_d[3], 5);
212 assert_eq!(v_d[4], 6);
216 fn test_slice_from() {
217 let vec: &[_] = &[1, 2, 3, 4];
218 assert_eq!(&vec[..], vec);
219 let b: &[_] = &[3, 4];
220 assert_eq!(&vec[2..], b);
222 assert_eq!(&vec[4..], b);
227 let vec: &[_] = &[1, 2, 3, 4];
228 assert_eq!(&vec[..4], vec);
229 let b: &[_] = &[1, 2];
230 assert_eq!(&vec[..2], b);
232 assert_eq!(&vec[..0], b);
240 assert_eq!(v.len(), 0);
241 assert_eq!(e, Some(5));
249 fn test_swap_remove() {
250 let mut v = vec![1, 2, 3, 4, 5];
251 let mut e = v.swap_remove(0);
253 assert_eq!(v, [5, 2, 3, 4]);
254 e = v.swap_remove(3);
256 assert_eq!(v, [5, 2, 3]);
261 fn test_swap_remove_fail() {
263 let _ = v.swap_remove(0);
264 let _ = v.swap_remove(0);
268 fn test_swap_remove_noncopyable() {
269 // Tests that we don't accidentally run destructors twice.
270 let mut v: Vec<Box<_>> = Vec::new();
274 let mut _e = v.swap_remove(0);
275 assert_eq!(v.len(), 2);
276 _e = v.swap_remove(1);
277 assert_eq!(v.len(), 1);
278 _e = v.swap_remove(0);
279 assert_eq!(v.len(), 0);
284 // Test on-stack push().
287 assert_eq!(v.len(), 1);
290 // Test on-heap push().
292 assert_eq!(v.len(), 2);
299 let mut v: Vec<Box<_>> = vec![box 6, box 5, box 4];
302 assert_eq!(v.len(), 1);
303 assert_eq!(*(v[0]), 6);
304 // If the unsafe block didn't drop things properly, we blow up here.
309 let mut v: Vec<Box<_>> = vec![box 6, box 5, box 4];
311 assert_eq!(v.len(), 0);
312 // If the unsafe block didn't drop things properly, we blow up here.
317 let mut v = vec![1, 2, 3, 4, 5];
319 assert_eq!(v, [1, 3, 5]);
323 fn test_binary_search() {
324 assert_eq!([1, 2, 3, 4, 5].binary_search(&5).ok(), Some(4));
325 assert_eq!([1, 2, 3, 4, 5].binary_search(&4).ok(), Some(3));
326 assert_eq!([1, 2, 3, 4, 5].binary_search(&3).ok(), Some(2));
327 assert_eq!([1, 2, 3, 4, 5].binary_search(&2).ok(), Some(1));
328 assert_eq!([1, 2, 3, 4, 5].binary_search(&1).ok(), Some(0));
330 assert_eq!([2, 4, 6, 8, 10].binary_search(&1).ok(), None);
331 assert_eq!([2, 4, 6, 8, 10].binary_search(&5).ok(), None);
332 assert_eq!([2, 4, 6, 8, 10].binary_search(&4).ok(), Some(1));
333 assert_eq!([2, 4, 6, 8, 10].binary_search(&10).ok(), Some(4));
335 assert_eq!([2, 4, 6, 8].binary_search(&1).ok(), None);
336 assert_eq!([2, 4, 6, 8].binary_search(&5).ok(), None);
337 assert_eq!([2, 4, 6, 8].binary_search(&4).ok(), Some(1));
338 assert_eq!([2, 4, 6, 8].binary_search(&8).ok(), Some(3));
340 assert_eq!([2, 4, 6].binary_search(&1).ok(), None);
341 assert_eq!([2, 4, 6].binary_search(&5).ok(), None);
342 assert_eq!([2, 4, 6].binary_search(&4).ok(), Some(1));
343 assert_eq!([2, 4, 6].binary_search(&6).ok(), Some(2));
345 assert_eq!([2, 4].binary_search(&1).ok(), None);
346 assert_eq!([2, 4].binary_search(&5).ok(), None);
347 assert_eq!([2, 4].binary_search(&2).ok(), Some(0));
348 assert_eq!([2, 4].binary_search(&4).ok(), Some(1));
350 assert_eq!([2].binary_search(&1).ok(), None);
351 assert_eq!([2].binary_search(&5).ok(), None);
352 assert_eq!([2].binary_search(&2).ok(), Some(0));
354 assert_eq!([].binary_search(&1).ok(), None);
355 assert_eq!([].binary_search(&5).ok(), None);
357 assert!([1, 1, 1, 1, 1].binary_search(&1).ok() != None);
358 assert!([1, 1, 1, 1, 2].binary_search(&1).ok() != None);
359 assert!([1, 1, 1, 2, 2].binary_search(&1).ok() != None);
360 assert!([1, 1, 2, 2, 2].binary_search(&1).ok() != None);
361 assert_eq!([1, 2, 2, 2, 2].binary_search(&1).ok(), Some(0));
363 assert_eq!([1, 2, 3, 4, 5].binary_search(&6).ok(), None);
364 assert_eq!([1, 2, 3, 4, 5].binary_search(&0).ok(), None);
369 let mut v = vec![10, 20];
370 assert_eq!(v[0], 10);
371 assert_eq!(v[1], 20);
373 assert_eq!(v[0], 20);
374 assert_eq!(v[1], 10);
376 let mut v3 = Vec::<i32>::new();
378 assert!(v3.is_empty());
380 // check the 1-byte-types path
381 let mut v = (-50..51i8).collect::<Vec<_>>();
383 assert_eq!(v, (-50..51i8).rev().collect::<Vec<_>>());
385 // check the 2-byte-types path
386 let mut v = (-50..51i16).collect::<Vec<_>>();
388 assert_eq!(v, (-50..51i16).rev().collect::<Vec<_>>());
392 #[cfg(not(miri))] // Miri is too slow
394 let mut rng = thread_rng();
396 for len in (2..25).chain(500..510) {
397 for &modulus in &[5, 10, 100, 1000] {
399 let orig: Vec<_> = rng.sample_iter::<i32, _>(&Standard)
400 .map(|x| x % modulus)
404 // Sort in default order.
405 let mut v = orig.clone();
407 assert!(v.windows(2).all(|w| w[0] <= w[1]));
409 // Sort in ascending order.
410 let mut v = orig.clone();
411 v.sort_by(|a, b| a.cmp(b));
412 assert!(v.windows(2).all(|w| w[0] <= w[1]));
414 // Sort in descending order.
415 let mut v = orig.clone();
416 v.sort_by(|a, b| b.cmp(a));
417 assert!(v.windows(2).all(|w| w[0] >= w[1]));
419 // Sort in lexicographic order.
420 let mut v1 = orig.clone();
421 let mut v2 = orig.clone();
422 v1.sort_by_key(|x| x.to_string());
423 v2.sort_by_cached_key(|x| x.to_string());
424 assert!(v1.windows(2).all(|w| w[0].to_string() <= w[1].to_string()));
427 // Sort with many pre-sorted runs.
428 let mut v = orig.clone();
432 let a = rng.gen::<usize>() % len;
433 let b = rng.gen::<usize>() % len;
441 assert!(v.windows(2).all(|w| w[0] <= w[1]));
446 // Sort using a completely random comparison function.
447 // This will reorder the elements *somehow*, but won't panic.
448 let mut v = [0; 500];
449 for i in 0..v.len() {
452 v.sort_by(|_, _| *[Less, Equal, Greater].choose(&mut rng).unwrap());
454 for i in 0..v.len() {
455 assert_eq!(v[i], i as i32);
463 let mut v = [0xDEADBEEFu64];
465 assert!(v == [0xDEADBEEF]);
469 fn test_sort_stability() {
470 #[cfg(not(miri))] // Miri is too slow
471 let large_range = 500..510;
472 #[cfg(not(miri))] // Miri is too slow
476 let large_range = 0..0; // empty range
480 for len in (2..25).chain(large_range) {
482 let mut counts = [0; 10];
484 // create a vector like [(6, 1), (5, 1), (6, 2), ...],
485 // where the first item of each tuple is random, but
486 // the second item represents which occurrence of that
487 // number this element is, i.e., the second elements
488 // will occur in sorted order.
489 let orig: Vec<_> = (0..len)
491 let n = thread_rng().gen::<usize>() % 10;
497 let mut v = orig.clone();
498 // Only sort on the first element, so an unstable sort
499 // may mix up the counts.
500 v.sort_by(|&(a, _), &(b, _)| a.cmp(&b));
502 // This comparison includes the count (the second item
503 // of the tuple), so elements with equal first items
504 // will need to be ordered with increasing
505 // counts... i.e., exactly asserting that this sort is
507 assert!(v.windows(2).all(|w| w[0] <= w[1]));
509 let mut v = orig.clone();
510 v.sort_by_cached_key(|&(x, _)| x);
511 assert!(v.windows(2).all(|w| w[0] <= w[1]));
517 fn test_rotate_left() {
518 let expected: Vec<_> = (0..13).collect();
519 let mut v = Vec::new();
522 v.clone_from(&expected);
524 assert_eq!(v, expected);
525 v.rotate_left(expected.len());
526 assert_eq!(v, expected);
527 let mut zst_array = [(), (), ()];
528 zst_array.rotate_left(2);
531 v = (5..13).chain(0..5).collect();
533 assert_eq!(v, expected);
535 let expected: Vec<_> = (0..1000).collect();
537 // small rotations in large slice, uses ptr::copy
538 v = (2..1000).chain(0..2).collect();
540 assert_eq!(v, expected);
541 v = (998..1000).chain(0..998).collect();
543 assert_eq!(v, expected);
545 // non-small prime rotation, has a few rounds of swapping
546 v = (389..1000).chain(0..389).collect();
547 v.rotate_left(1000-389);
548 assert_eq!(v, expected);
552 fn test_rotate_right() {
553 let expected: Vec<_> = (0..13).collect();
554 let mut v = Vec::new();
557 v.clone_from(&expected);
559 assert_eq!(v, expected);
560 v.rotate_right(expected.len());
561 assert_eq!(v, expected);
562 let mut zst_array = [(), (), ()];
563 zst_array.rotate_right(2);
566 v = (5..13).chain(0..5).collect();
568 assert_eq!(v, expected);
570 let expected: Vec<_> = (0..1000).collect();
572 // small rotations in large slice, uses ptr::copy
573 v = (2..1000).chain(0..2).collect();
575 assert_eq!(v, expected);
576 v = (998..1000).chain(0..998).collect();
578 assert_eq!(v, expected);
580 // non-small prime rotation, has a few rounds of swapping
581 v = (389..1000).chain(0..389).collect();
583 assert_eq!(v, expected);
588 let v: [Vec<i32>; 0] = [];
591 let d = [vec![1], vec![2, 3]].concat();
592 assert_eq!(d, [1, 2, 3]);
594 let v: &[&[_]] = &[&[1], &[2, 3]];
595 assert_eq!(v.join(&0), [1, 0, 2, 3]);
596 let v: &[&[_]] = &[&[1], &[2], &[3]];
597 assert_eq!(v.join(&0), [1, 0, 2, 0, 3]);
602 let v: [Vec<i32>; 0] = [];
603 assert_eq!(v.join(&0), []);
604 assert_eq!([vec![1], vec![2, 3]].join(&0), [1, 0, 2, 3]);
605 assert_eq!([vec![1], vec![2], vec![3]].join(&0), [1, 0, 2, 0, 3]);
607 let v: [&[_]; 2] = [&[1], &[2, 3]];
608 assert_eq!(v.join(&0), [1, 0, 2, 3]);
609 let v: [&[_]; 3] = [&[1], &[2], &[3]];
610 assert_eq!(v.join(&0), [1, 0, 2, 0, 3]);
614 fn test_join_nocopy() {
615 let v: [String; 0] = [];
616 assert_eq!(v.join(","), "");
617 assert_eq!(["a".to_string(), "ab".into()].join(","), "a,ab");
618 assert_eq!(["a".to_string(), "ab".into(), "abc".into()].join(","), "a,ab,abc");
619 assert_eq!(["a".to_string(), "ab".into(), "".into()].join(","), "a,ab,");
624 let mut a = vec![1, 2, 4];
626 assert_eq!(a, [1, 2, 3, 4]);
628 let mut a = vec![1, 2, 3];
630 assert_eq!(a, [0, 1, 2, 3]);
632 let mut a = vec![1, 2, 3];
634 assert_eq!(a, [1, 2, 3, 4]);
643 fn test_insert_oob() {
644 let mut a = vec![1, 2, 3];
650 let mut a = vec![1, 2, 3, 4];
652 assert_eq!(a.remove(2), 3);
653 assert_eq!(a, [1, 2, 4]);
655 assert_eq!(a.remove(2), 4);
656 assert_eq!(a, [1, 2]);
658 assert_eq!(a.remove(0), 1);
661 assert_eq!(a.remove(0), 2);
667 fn test_remove_fail() {
677 assert!(v.capacity() >= 11);
682 let v = vec![1, 2, 3, 4, 5];
684 assert_eq!(v.len(), 2);
689 macro_rules! assert_order {
690 (Greater, $a:expr, $b:expr) => {
691 assert_eq!($a.cmp($b), Greater);
694 (Less, $a:expr, $b:expr) => {
695 assert_eq!($a.cmp($b), Less);
698 (Equal, $a:expr, $b:expr) => {
699 assert_eq!($a.cmp($b), Equal);
705 fn test_total_ord_u8() {
706 let c = &[1u8, 2, 3];
707 assert_order!(Greater, &[1u8, 2, 3, 4][..], &c[..]);
708 let c = &[1u8, 2, 3, 4];
709 assert_order!(Less, &[1u8, 2, 3][..], &c[..]);
710 let c = &[1u8, 2, 3, 6];
711 assert_order!(Equal, &[1u8, 2, 3, 6][..], &c[..]);
712 let c = &[1u8, 2, 3, 4, 5, 6];
713 assert_order!(Less, &[1u8, 2, 3, 4, 5, 5, 5, 5][..], &c[..]);
714 let c = &[1u8, 2, 3, 4];
715 assert_order!(Greater, &[2u8, 2][..], &c[..]);
720 fn test_total_ord_i32() {
722 assert_order!(Greater, &[1, 2, 3, 4][..], &c[..]);
723 let c = &[1, 2, 3, 4];
724 assert_order!(Less, &[1, 2, 3][..], &c[..]);
725 let c = &[1, 2, 3, 6];
726 assert_order!(Equal, &[1, 2, 3, 6][..], &c[..]);
727 let c = &[1, 2, 3, 4, 5, 6];
728 assert_order!(Less, &[1, 2, 3, 4, 5, 5, 5, 5][..], &c[..]);
729 let c = &[1, 2, 3, 4];
730 assert_order!(Greater, &[2, 2][..], &c[..]);
735 let xs = [1, 2, 5, 10, 11];
736 let mut it = xs.iter();
737 assert_eq!(it.size_hint(), (5, Some(5)));
738 assert_eq!(it.next().unwrap(), &1);
739 assert_eq!(it.size_hint(), (4, Some(4)));
740 assert_eq!(it.next().unwrap(), &2);
741 assert_eq!(it.size_hint(), (3, Some(3)));
742 assert_eq!(it.next().unwrap(), &5);
743 assert_eq!(it.size_hint(), (2, Some(2)));
744 assert_eq!(it.next().unwrap(), &10);
745 assert_eq!(it.size_hint(), (1, Some(1)));
746 assert_eq!(it.next().unwrap(), &11);
747 assert_eq!(it.size_hint(), (0, Some(0)));
748 assert!(it.next().is_none());
752 fn test_iter_size_hints() {
753 let mut xs = [1, 2, 5, 10, 11];
754 assert_eq!(xs.iter().size_hint(), (5, Some(5)));
755 assert_eq!(xs.iter_mut().size_hint(), (5, Some(5)));
759 fn test_iter_as_slice() {
760 let xs = [1, 2, 5, 10, 11];
761 let mut iter = xs.iter();
762 assert_eq!(iter.as_slice(), &[1, 2, 5, 10, 11]);
764 assert_eq!(iter.as_slice(), &[2, 5, 10, 11]);
768 fn test_iter_as_ref() {
769 let xs = [1, 2, 5, 10, 11];
770 let mut iter = xs.iter();
771 assert_eq!(iter.as_ref(), &[1, 2, 5, 10, 11]);
773 assert_eq!(iter.as_ref(), &[2, 5, 10, 11]);
777 fn test_iter_clone() {
779 let mut it = xs.iter();
781 let mut jt = it.clone();
782 assert_eq!(it.next(), jt.next());
783 assert_eq!(it.next(), jt.next());
784 assert_eq!(it.next(), jt.next());
788 fn test_iter_is_empty() {
789 let xs = [1, 2, 5, 10, 11];
790 for i in 0..xs.len() {
791 for j in i..xs.len() {
792 assert_eq!(xs[i..j].iter().is_empty(), xs[i..j].is_empty());
798 fn test_mut_iterator() {
799 let mut xs = [1, 2, 3, 4, 5];
803 assert!(xs == [2, 3, 4, 5, 6])
807 fn test_rev_iterator() {
809 let xs = [1, 2, 5, 10, 11];
810 let ys = [11, 10, 5, 2, 1];
812 for &x in xs.iter().rev() {
813 assert_eq!(x, ys[i]);
820 fn test_mut_rev_iterator() {
821 let mut xs = [1, 2, 3, 4, 5];
822 for (i, x) in xs.iter_mut().rev().enumerate() {
825 assert!(xs == [5, 5, 5, 5, 5])
829 fn test_move_iterator() {
830 let xs = vec![1, 2, 3, 4, 5];
831 assert_eq!(xs.into_iter().fold(0, |a: usize, b: usize| 10 * a + b),
836 fn test_move_rev_iterator() {
837 let xs = vec![1, 2, 3, 4, 5];
838 assert_eq!(xs.into_iter().rev().fold(0, |a: usize, b: usize| 10 * a + b),
843 fn test_splitator() {
844 let xs = &[1, 2, 3, 4, 5];
846 let splits: &[&[_]] = &[&[1], &[3], &[5]];
847 assert_eq!(xs.split(|x| *x % 2 == 0).collect::<Vec<_>>(), splits);
848 let splits: &[&[_]] = &[&[], &[2, 3, 4, 5]];
849 assert_eq!(xs.split(|x| *x == 1).collect::<Vec<_>>(), splits);
850 let splits: &[&[_]] = &[&[1, 2, 3, 4], &[]];
851 assert_eq!(xs.split(|x| *x == 5).collect::<Vec<_>>(), splits);
852 let splits: &[&[_]] = &[&[1, 2, 3, 4, 5]];
853 assert_eq!(xs.split(|x| *x == 10).collect::<Vec<_>>(), splits);
854 let splits: &[&[_]] = &[&[], &[], &[], &[], &[], &[]];
855 assert_eq!(xs.split(|_| true).collect::<Vec<&[i32]>>(), splits);
857 let xs: &[i32] = &[];
858 let splits: &[&[i32]] = &[&[]];
859 assert_eq!(xs.split(|x| *x == 5).collect::<Vec<&[i32]>>(), splits);
863 fn test_splitnator() {
864 let xs = &[1, 2, 3, 4, 5];
866 let splits: &[&[_]] = &[&[1, 2, 3, 4, 5]];
867 assert_eq!(xs.splitn(1, |x| *x % 2 == 0).collect::<Vec<_>>(), splits);
868 let splits: &[&[_]] = &[&[1], &[3, 4, 5]];
869 assert_eq!(xs.splitn(2, |x| *x % 2 == 0).collect::<Vec<_>>(), splits);
870 let splits: &[&[_]] = &[&[], &[], &[], &[4, 5]];
871 assert_eq!(xs.splitn(4, |_| true).collect::<Vec<_>>(), splits);
873 let xs: &[i32] = &[];
874 let splits: &[&[i32]] = &[&[]];
875 assert_eq!(xs.splitn(2, |x| *x == 5).collect::<Vec<_>>(), splits);
879 fn test_splitnator_mut() {
880 let xs = &mut [1, 2, 3, 4, 5];
882 let splits: &[&mut [_]] = &[&mut [1, 2, 3, 4, 5]];
883 assert_eq!(xs.splitn_mut(1, |x| *x % 2 == 0).collect::<Vec<_>>(),
885 let splits: &[&mut [_]] = &[&mut [1], &mut [3, 4, 5]];
886 assert_eq!(xs.splitn_mut(2, |x| *x % 2 == 0).collect::<Vec<_>>(),
888 let splits: &[&mut [_]] = &[&mut [], &mut [], &mut [], &mut [4, 5]];
889 assert_eq!(xs.splitn_mut(4, |_| true).collect::<Vec<_>>(), splits);
891 let xs: &mut [i32] = &mut [];
892 let splits: &[&mut [i32]] = &[&mut []];
893 assert_eq!(xs.splitn_mut(2, |x| *x == 5).collect::<Vec<_>>(), splits);
897 fn test_rsplitator() {
898 let xs = &[1, 2, 3, 4, 5];
900 let splits: &[&[_]] = &[&[5], &[3], &[1]];
901 assert_eq!(xs.split(|x| *x % 2 == 0).rev().collect::<Vec<_>>(), splits);
902 let splits: &[&[_]] = &[&[2, 3, 4, 5], &[]];
903 assert_eq!(xs.split(|x| *x == 1).rev().collect::<Vec<_>>(), splits);
904 let splits: &[&[_]] = &[&[], &[1, 2, 3, 4]];
905 assert_eq!(xs.split(|x| *x == 5).rev().collect::<Vec<_>>(), splits);
906 let splits: &[&[_]] = &[&[1, 2, 3, 4, 5]];
907 assert_eq!(xs.split(|x| *x == 10).rev().collect::<Vec<_>>(), splits);
909 let xs: &[i32] = &[];
910 let splits: &[&[i32]] = &[&[]];
911 assert_eq!(xs.split(|x| *x == 5).rev().collect::<Vec<&[i32]>>(), splits);
915 fn test_rsplitnator() {
916 let xs = &[1, 2, 3, 4, 5];
918 let splits: &[&[_]] = &[&[1, 2, 3, 4, 5]];
919 assert_eq!(xs.rsplitn(1, |x| *x % 2 == 0).collect::<Vec<_>>(), splits);
920 let splits: &[&[_]] = &[&[5], &[1, 2, 3]];
921 assert_eq!(xs.rsplitn(2, |x| *x % 2 == 0).collect::<Vec<_>>(), splits);
922 let splits: &[&[_]] = &[&[], &[], &[], &[1, 2]];
923 assert_eq!(xs.rsplitn(4, |_| true).collect::<Vec<_>>(), splits);
925 let xs: &[i32] = &[];
926 let splits: &[&[i32]] = &[&[]];
927 assert_eq!(xs.rsplitn(2, |x| *x == 5).collect::<Vec<&[i32]>>(), splits);
928 assert!(xs.rsplitn(0, |x| *x % 2 == 0).next().is_none());
932 fn test_windowsator() {
933 let v = &[1, 2, 3, 4];
935 let wins: &[&[_]] = &[&[1, 2], &[2, 3], &[3, 4]];
936 assert_eq!(v.windows(2).collect::<Vec<_>>(), wins);
938 let wins: &[&[_]] = &[&[1, 2, 3], &[2, 3, 4]];
939 assert_eq!(v.windows(3).collect::<Vec<_>>(), wins);
940 assert!(v.windows(6).next().is_none());
942 let wins: &[&[_]] = &[&[3, 4], &[2, 3], &[1, 2]];
943 assert_eq!(v.windows(2).rev().collect::<Vec<&[_]>>(), wins);
948 fn test_windowsator_0() {
949 let v = &[1, 2, 3, 4];
950 let _it = v.windows(0);
954 fn test_chunksator() {
955 let v = &[1, 2, 3, 4, 5];
957 assert_eq!(v.chunks(2).len(), 3);
959 let chunks: &[&[_]] = &[&[1, 2], &[3, 4], &[5]];
960 assert_eq!(v.chunks(2).collect::<Vec<_>>(), chunks);
961 let chunks: &[&[_]] = &[&[1, 2, 3], &[4, 5]];
962 assert_eq!(v.chunks(3).collect::<Vec<_>>(), chunks);
963 let chunks: &[&[_]] = &[&[1, 2, 3, 4, 5]];
964 assert_eq!(v.chunks(6).collect::<Vec<_>>(), chunks);
966 let chunks: &[&[_]] = &[&[5], &[3, 4], &[1, 2]];
967 assert_eq!(v.chunks(2).rev().collect::<Vec<_>>(), chunks);
972 fn test_chunksator_0() {
973 let v = &[1, 2, 3, 4];
974 let _it = v.chunks(0);
978 fn test_chunks_exactator() {
979 let v = &[1, 2, 3, 4, 5];
981 assert_eq!(v.chunks_exact(2).len(), 2);
983 let chunks: &[&[_]] = &[&[1, 2], &[3, 4]];
984 assert_eq!(v.chunks_exact(2).collect::<Vec<_>>(), chunks);
985 let chunks: &[&[_]] = &[&[1, 2, 3]];
986 assert_eq!(v.chunks_exact(3).collect::<Vec<_>>(), chunks);
987 let chunks: &[&[_]] = &[];
988 assert_eq!(v.chunks_exact(6).collect::<Vec<_>>(), chunks);
990 let chunks: &[&[_]] = &[&[3, 4], &[1, 2]];
991 assert_eq!(v.chunks_exact(2).rev().collect::<Vec<_>>(), chunks);
996 fn test_chunks_exactator_0() {
997 let v = &[1, 2, 3, 4];
998 let _it = v.chunks_exact(0);
1002 fn test_rchunksator() {
1003 let v = &[1, 2, 3, 4, 5];
1005 assert_eq!(v.rchunks(2).len(), 3);
1007 let chunks: &[&[_]] = &[&[4, 5], &[2, 3], &[1]];
1008 assert_eq!(v.rchunks(2).collect::<Vec<_>>(), chunks);
1009 let chunks: &[&[_]] = &[&[3, 4, 5], &[1, 2]];
1010 assert_eq!(v.rchunks(3).collect::<Vec<_>>(), chunks);
1011 let chunks: &[&[_]] = &[&[1, 2, 3, 4, 5]];
1012 assert_eq!(v.rchunks(6).collect::<Vec<_>>(), chunks);
1014 let chunks: &[&[_]] = &[&[1], &[2, 3], &[4, 5]];
1015 assert_eq!(v.rchunks(2).rev().collect::<Vec<_>>(), chunks);
1020 fn test_rchunksator_0() {
1021 let v = &[1, 2, 3, 4];
1022 let _it = v.rchunks(0);
1026 fn test_rchunks_exactator() {
1027 let v = &[1, 2, 3, 4, 5];
1029 assert_eq!(v.rchunks_exact(2).len(), 2);
1031 let chunks: &[&[_]] = &[&[4, 5], &[2, 3]];
1032 assert_eq!(v.rchunks_exact(2).collect::<Vec<_>>(), chunks);
1033 let chunks: &[&[_]] = &[&[3, 4, 5]];
1034 assert_eq!(v.rchunks_exact(3).collect::<Vec<_>>(), chunks);
1035 let chunks: &[&[_]] = &[];
1036 assert_eq!(v.rchunks_exact(6).collect::<Vec<_>>(), chunks);
1038 let chunks: &[&[_]] = &[&[2, 3], &[4, 5]];
1039 assert_eq!(v.rchunks_exact(2).rev().collect::<Vec<_>>(), chunks);
1044 fn test_rchunks_exactator_0() {
1045 let v = &[1, 2, 3, 4];
1046 let _it = v.rchunks_exact(0);
1050 fn test_reverse_part() {
1051 let mut values = [1, 2, 3, 4, 5];
1052 values[1..4].reverse();
1053 assert!(values == [1, 4, 3, 2, 5]);
1058 macro_rules! test_show_vec {
1059 ($x:expr, $x_str:expr) => ({
1060 let (x, x_str) = ($x, $x_str);
1061 assert_eq!(format!("{:?}", x), x_str);
1062 assert_eq!(format!("{:?}", x), x_str);
1065 let empty = Vec::<i32>::new();
1066 test_show_vec!(empty, "[]");
1067 test_show_vec!(vec![1], "[1]");
1068 test_show_vec!(vec![1, 2, 3], "[1, 2, 3]");
1069 test_show_vec!(vec![vec![], vec![1], vec![1, 1]], "[[], [1], [1, 1]]");
1071 let empty_mut: &mut [i32] = &mut [];
1072 test_show_vec!(empty_mut, "[]");
1074 test_show_vec!(v, "[1]");
1075 let v = &mut [1, 2, 3];
1076 test_show_vec!(v, "[1, 2, 3]");
1077 let v: &mut [&mut [_]] = &mut [&mut [], &mut [1], &mut [1, 1]];
1078 test_show_vec!(v, "[[], [1], [1, 1]]");
1082 fn test_vec_default() {
1085 let v: $ty = Default::default();
1086 assert!(v.is_empty());
1096 fn test_overflow_does_not_cause_segfault() {
1098 v.reserve_exact(!0);
1105 fn test_overflow_does_not_cause_segfault_managed() {
1106 let mut v = vec![Rc::new(1)];
1107 v.reserve_exact(!0);
1112 fn test_mut_split_at() {
1113 let mut values = [1, 2, 3, 4, 5];
1115 let (left, right) = values.split_at_mut(2);
1117 let left: &[_] = left;
1118 assert!(left[..left.len()] == [1, 2]);
1125 let right: &[_] = right;
1126 assert!(right[..right.len()] == [3, 4, 5]);
1133 assert!(values == [2, 3, 5, 6, 7]);
1136 #[derive(Clone, PartialEq)]
1140 fn test_iter_zero_sized() {
1141 let mut v = vec![Foo, Foo, Foo];
1142 assert_eq!(v.len(), 3);
1167 assert_eq!(cnt, 11);
1169 let xs: [Foo; 3] = [Foo, Foo, Foo];
1179 fn test_shrink_to_fit() {
1180 let mut xs = vec![0, 1, 2, 3];
1184 assert_eq!(xs.capacity(), 128);
1186 assert_eq!(xs.capacity(), 100);
1187 assert_eq!(xs, (0..100).collect::<Vec<_>>());
1191 fn test_starts_with() {
1192 assert!(b"foobar".starts_with(b"foo"));
1193 assert!(!b"foobar".starts_with(b"oob"));
1194 assert!(!b"foobar".starts_with(b"bar"));
1195 assert!(!b"foo".starts_with(b"foobar"));
1196 assert!(!b"bar".starts_with(b"foobar"));
1197 assert!(b"foobar".starts_with(b"foobar"));
1198 let empty: &[u8] = &[];
1199 assert!(empty.starts_with(empty));
1200 assert!(!empty.starts_with(b"foo"));
1201 assert!(b"foobar".starts_with(empty));
1205 fn test_ends_with() {
1206 assert!(b"foobar".ends_with(b"bar"));
1207 assert!(!b"foobar".ends_with(b"oba"));
1208 assert!(!b"foobar".ends_with(b"foo"));
1209 assert!(!b"foo".ends_with(b"foobar"));
1210 assert!(!b"bar".ends_with(b"foobar"));
1211 assert!(b"foobar".ends_with(b"foobar"));
1212 let empty: &[u8] = &[];
1213 assert!(empty.ends_with(empty));
1214 assert!(!empty.ends_with(b"foo"));
1215 assert!(b"foobar".ends_with(empty));
1219 fn test_mut_splitator() {
1220 let mut xs = [0, 1, 0, 2, 3, 0, 0, 4, 5, 0];
1221 assert_eq!(xs.split_mut(|x| *x == 0).count(), 6);
1222 for slice in xs.split_mut(|x| *x == 0) {
1225 assert!(xs == [0, 1, 0, 3, 2, 0, 0, 5, 4, 0]);
1227 let mut xs = [0, 1, 0, 2, 3, 0, 0, 4, 5, 0, 6, 7];
1228 for slice in xs.split_mut(|x| *x == 0).take(5) {
1231 assert!(xs == [0, 1, 0, 3, 2, 0, 0, 5, 4, 0, 6, 7]);
1235 fn test_mut_splitator_rev() {
1236 let mut xs = [1, 2, 0, 3, 4, 0, 0, 5, 6, 0];
1237 for slice in xs.split_mut(|x| *x == 0).rev().take(4) {
1240 assert!(xs == [1, 2, 0, 4, 3, 0, 0, 6, 5, 0]);
1245 let mut v = [0, 1, 2];
1246 assert_eq!(v.get_mut(3), None);
1247 v.get_mut(1).map(|e| *e = 7);
1248 assert_eq!(v[1], 7);
1250 assert_eq!(v.get_mut(2), Some(&mut x));
1254 fn test_mut_chunks() {
1255 let mut v = [0, 1, 2, 3, 4, 5, 6];
1256 assert_eq!(v.chunks_mut(3).len(), 3);
1257 for (i, chunk) in v.chunks_mut(3).enumerate() {
1262 let result = [0, 0, 0, 1, 1, 1, 2];
1263 assert_eq!(v, result);
1267 fn test_mut_chunks_rev() {
1268 let mut v = [0, 1, 2, 3, 4, 5, 6];
1269 for (i, chunk) in v.chunks_mut(3).rev().enumerate() {
1274 let result = [2, 2, 2, 1, 1, 1, 0];
1275 assert_eq!(v, result);
1280 fn test_mut_chunks_0() {
1281 let mut v = [1, 2, 3, 4];
1282 let _it = v.chunks_mut(0);
1286 fn test_mut_chunks_exact() {
1287 let mut v = [0, 1, 2, 3, 4, 5, 6];
1288 assert_eq!(v.chunks_exact_mut(3).len(), 2);
1289 for (i, chunk) in v.chunks_exact_mut(3).enumerate() {
1294 let result = [0, 0, 0, 1, 1, 1, 6];
1295 assert_eq!(v, result);
1299 fn test_mut_chunks_exact_rev() {
1300 let mut v = [0, 1, 2, 3, 4, 5, 6];
1301 for (i, chunk) in v.chunks_exact_mut(3).rev().enumerate() {
1306 let result = [1, 1, 1, 0, 0, 0, 6];
1307 assert_eq!(v, result);
1312 fn test_mut_chunks_exact_0() {
1313 let mut v = [1, 2, 3, 4];
1314 let _it = v.chunks_exact_mut(0);
1318 fn test_mut_rchunks() {
1319 let mut v = [0, 1, 2, 3, 4, 5, 6];
1320 assert_eq!(v.rchunks_mut(3).len(), 3);
1321 for (i, chunk) in v.rchunks_mut(3).enumerate() {
1326 let result = [2, 1, 1, 1, 0, 0, 0];
1327 assert_eq!(v, result);
1331 fn test_mut_rchunks_rev() {
1332 let mut v = [0, 1, 2, 3, 4, 5, 6];
1333 for (i, chunk) in v.rchunks_mut(3).rev().enumerate() {
1338 let result = [0, 1, 1, 1, 2, 2, 2];
1339 assert_eq!(v, result);
1344 fn test_mut_rchunks_0() {
1345 let mut v = [1, 2, 3, 4];
1346 let _it = v.rchunks_mut(0);
1350 fn test_mut_rchunks_exact() {
1351 let mut v = [0, 1, 2, 3, 4, 5, 6];
1352 assert_eq!(v.rchunks_exact_mut(3).len(), 2);
1353 for (i, chunk) in v.rchunks_exact_mut(3).enumerate() {
1358 let result = [0, 1, 1, 1, 0, 0, 0];
1359 assert_eq!(v, result);
1363 fn test_mut_rchunks_exact_rev() {
1364 let mut v = [0, 1, 2, 3, 4, 5, 6];
1365 for (i, chunk) in v.rchunks_exact_mut(3).rev().enumerate() {
1370 let result = [0, 0, 0, 0, 1, 1, 1];
1371 assert_eq!(v, result);
1376 fn test_mut_rchunks_exact_0() {
1377 let mut v = [1, 2, 3, 4];
1378 let _it = v.rchunks_exact_mut(0);
1382 fn test_mut_last() {
1383 let mut x = [1, 2, 3, 4, 5];
1384 let h = x.last_mut();
1385 assert_eq!(*h.unwrap(), 5);
1387 let y: &mut [i32] = &mut [];
1388 assert!(y.last_mut().is_none());
1393 let xs: Box<_> = box [1, 2, 3];
1394 let ys = xs.to_vec();
1395 assert_eq!(ys, [1, 2, 3]);
1399 fn test_box_slice_clone() {
1400 let data = vec![vec![0, 1], vec![0], vec![1]];
1401 let data2 = data.clone().into_boxed_slice().clone().to_vec();
1403 assert_eq!(data, data2);
1407 #[allow(unused_must_use)] // here, we care about the side effects of `.clone()`
1408 #[cfg_attr(target_os = "emscripten", ignore)]
1409 #[cfg(not(miri))] // Miri does not support threads
1410 fn test_box_slice_clone_panics() {
1412 use std::sync::atomic::{AtomicUsize, Ordering};
1413 use std::thread::spawn;
1416 count: Arc<AtomicUsize>,
1420 impl Drop for Canary {
1421 fn drop(&mut self) {
1422 self.count.fetch_add(1, Ordering::SeqCst);
1426 impl Clone for Canary {
1427 fn clone(&self) -> Self {
1433 count: self.count.clone(),
1434 panics: self.panics,
1439 let drop_count = Arc::new(AtomicUsize::new(0));
1440 let canary = Canary {
1441 count: drop_count.clone(),
1444 let panic = Canary {
1445 count: drop_count.clone(),
1450 // When xs is dropped, +5.
1451 let xs = vec![canary.clone(), canary.clone(), canary.clone(), panic, canary]
1452 .into_boxed_slice();
1454 // When panic is cloned, +3.
1461 assert_eq!(drop_count.load(Ordering::SeqCst), 8);
1465 fn test_copy_from_slice() {
1466 let src = [0, 1, 2, 3, 4, 5];
1467 let mut dst = [0; 6];
1468 dst.copy_from_slice(&src);
1469 assert_eq!(src, dst)
1473 #[should_panic(expected = "destination and source slices have different lengths")]
1474 fn test_copy_from_slice_dst_longer() {
1475 let src = [0, 1, 2, 3];
1476 let mut dst = [0; 5];
1477 dst.copy_from_slice(&src);
1481 #[should_panic(expected = "destination and source slices have different lengths")]
1482 fn test_copy_from_slice_dst_shorter() {
1483 let src = [0, 1, 2, 3];
1484 let mut dst = [0; 3];
1485 dst.copy_from_slice(&src);
1488 const MAX_LEN: usize = 80;
1490 static DROP_COUNTS: [AtomicUsize; MAX_LEN] = [
1491 // FIXME(RFC 1109): AtomicUsize is not Copy.
1492 AtomicUsize::new(0), AtomicUsize::new(0), AtomicUsize::new(0), AtomicUsize::new(0),
1493 AtomicUsize::new(0), AtomicUsize::new(0), AtomicUsize::new(0), AtomicUsize::new(0),
1494 AtomicUsize::new(0), AtomicUsize::new(0), AtomicUsize::new(0), AtomicUsize::new(0),
1495 AtomicUsize::new(0), AtomicUsize::new(0), AtomicUsize::new(0), AtomicUsize::new(0),
1496 AtomicUsize::new(0), AtomicUsize::new(0), AtomicUsize::new(0), AtomicUsize::new(0),
1497 AtomicUsize::new(0), AtomicUsize::new(0), AtomicUsize::new(0), AtomicUsize::new(0),
1498 AtomicUsize::new(0), AtomicUsize::new(0), AtomicUsize::new(0), AtomicUsize::new(0),
1499 AtomicUsize::new(0), AtomicUsize::new(0), AtomicUsize::new(0), AtomicUsize::new(0),
1500 AtomicUsize::new(0), AtomicUsize::new(0), AtomicUsize::new(0), AtomicUsize::new(0),
1501 AtomicUsize::new(0), AtomicUsize::new(0), AtomicUsize::new(0), AtomicUsize::new(0),
1502 AtomicUsize::new(0), AtomicUsize::new(0), AtomicUsize::new(0), AtomicUsize::new(0),
1503 AtomicUsize::new(0), AtomicUsize::new(0), AtomicUsize::new(0), AtomicUsize::new(0),
1504 AtomicUsize::new(0), AtomicUsize::new(0), AtomicUsize::new(0), AtomicUsize::new(0),
1505 AtomicUsize::new(0), AtomicUsize::new(0), AtomicUsize::new(0), AtomicUsize::new(0),
1506 AtomicUsize::new(0), AtomicUsize::new(0), AtomicUsize::new(0), AtomicUsize::new(0),
1507 AtomicUsize::new(0), AtomicUsize::new(0), AtomicUsize::new(0), AtomicUsize::new(0),
1508 AtomicUsize::new(0), AtomicUsize::new(0), AtomicUsize::new(0), AtomicUsize::new(0),
1509 AtomicUsize::new(0), AtomicUsize::new(0), AtomicUsize::new(0), AtomicUsize::new(0),
1510 AtomicUsize::new(0), AtomicUsize::new(0), AtomicUsize::new(0), AtomicUsize::new(0),
1511 AtomicUsize::new(0), AtomicUsize::new(0), AtomicUsize::new(0), AtomicUsize::new(0),
1514 static VERSIONS: AtomicUsize = AtomicUsize::new(0);
1516 #[derive(Clone, Eq)]
1517 struct DropCounter {
1520 version: Cell<usize>,
1523 impl PartialEq for DropCounter {
1524 fn eq(&self, other: &Self) -> bool {
1525 self.partial_cmp(other) == Some(Ordering::Equal)
1529 impl PartialOrd for DropCounter {
1530 fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
1531 self.version.set(self.version.get() + 1);
1532 other.version.set(other.version.get() + 1);
1533 VERSIONS.fetch_add(2, Relaxed);
1534 self.x.partial_cmp(&other.x)
1538 impl Ord for DropCounter {
1539 fn cmp(&self, other: &Self) -> Ordering {
1540 self.partial_cmp(other).unwrap()
1544 impl Drop for DropCounter {
1545 fn drop(&mut self) {
1546 DROP_COUNTS[self.id].fetch_add(1, Relaxed);
1547 VERSIONS.fetch_sub(self.version.get(), Relaxed);
1552 ($input:ident, $func:ident) => {
1553 let len = $input.len();
1555 // Work out the total number of comparisons required to sort
1557 let mut count = 0usize;
1558 $input.to_owned().$func(|a, b| { count += 1; a.cmp(b) });
1560 // ... and then panic on each and every single one.
1561 for panic_countdown in 0..count {
1562 // Refresh the counters.
1563 VERSIONS.store(0, Relaxed);
1565 DROP_COUNTS[i].store(0, Relaxed);
1568 let v = $input.to_owned();
1569 let _ = thread::spawn(move || {
1571 let mut panic_countdown = panic_countdown;
1573 if panic_countdown == 0 {
1574 SILENCE_PANIC.with(|s| s.set(true));
1577 panic_countdown -= 1;
1582 // Check that the number of things dropped is exactly
1583 // what we expect (i.e., the contents of `v`).
1584 for (i, c) in DROP_COUNTS.iter().enumerate().take(len) {
1585 let count = c.load(Relaxed);
1587 "found drop count == {} for i == {}, len == {}",
1591 // Check that the most recent versions of values were dropped.
1592 assert_eq!(VERSIONS.load(Relaxed), 0);
1597 thread_local!(static SILENCE_PANIC: Cell<bool> = Cell::new(false));
1600 #[cfg_attr(target_os = "emscripten", ignore)] // no threads
1601 #[cfg(not(miri))] // Miri does not support threads
1603 let prev = panic::take_hook();
1604 panic::set_hook(Box::new(move |info| {
1605 if !SILENCE_PANIC.with(|s| s.get()) {
1610 let mut rng = thread_rng();
1612 for len in (1..20).chain(70..MAX_LEN) {
1613 for &modulus in &[5, 20, 50] {
1614 for &has_runs in &[false, true] {
1615 let mut input = (0..len)
1618 x: rng.next_u32() % modulus,
1620 version: Cell::new(0),
1623 .collect::<Vec<_>>();
1626 for c in &mut input {
1631 let a = rng.gen::<usize>() % len;
1632 let b = rng.gen::<usize>() % len;
1634 input[a..b].reverse();
1641 test!(input, sort_by);
1642 test!(input, sort_unstable_by);
1649 fn repeat_generic_slice() {
1650 assert_eq!([1, 2].repeat(2), vec![1, 2, 1, 2]);
1651 assert_eq!([1, 2, 3, 4].repeat(0), vec![]);
1652 assert_eq!([1, 2, 3, 4].repeat(1), vec![1, 2, 3, 4]);
1654 [1, 2, 3, 4].repeat(3),
1655 vec![1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4]