3 use std::collections::TryReserveError::*;
5 use std::iter::InPlaceIterable;
6 use std::mem::{size_of, swap};
7 use std::ops::Bound::*;
8 use std::panic::{catch_unwind, AssertUnwindSafe};
10 use std::sync::atomic::{AtomicU32, Ordering};
11 use std::vec::{Drain, IntoIter};
13 struct DropCounter<'a> {
17 impl Drop for DropCounter<'_> {
24 fn test_small_vec_struct() {
25 assert_eq!(size_of::<Vec<u8>>(), size_of::<usize>() * 3);
29 fn test_double_drop() {
35 let (mut count_x, mut count_y) = (0, 0);
37 let mut tv = TwoVec { x: Vec::new(), y: Vec::new() };
38 tv.x.push(DropCounter { count: &mut count_x });
39 tv.y.push(DropCounter { count: &mut count_y });
41 // If Vec had a drop flag, here is where it would be zeroed.
42 // Instead, it should rely on its internal state to prevent
43 // doing anything significant when dropped multiple times.
46 // Here tv goes out of scope, tv.y should be dropped, but not tv.x.
49 assert_eq!(count_x, 1);
50 assert_eq!(count_y, 1);
55 let mut v = Vec::new();
56 assert_eq!(v.capacity(), 0);
59 assert!(v.capacity() >= 2);
65 assert!(v.capacity() >= 16);
67 assert!(v.capacity() >= 32);
72 assert!(v.capacity() >= 33)
76 fn test_zst_capacity() {
77 assert_eq!(Vec::<()>::new().capacity(), usize::MAX);
82 let v: Vec<isize> = vec![10, 20];
87 assert_eq!(v[x + 1], 20);
90 assert_eq!(v[x - 1], 10);
95 let vec1: Vec<isize> = vec![];
96 assert_eq!("[]", format!("{:?}", vec1));
98 let vec2 = vec![0, 1];
99 assert_eq!("[0, 1]", format!("{:?}", vec2));
101 let slice: &[isize] = &[4, 5];
102 assert_eq!("[4, 5]", format!("{:?}", slice));
111 assert_eq!(v, [1, 2]);
113 assert_eq!(v, [1, 2, 3]);
118 let mut v = Vec::new();
119 let mut w = Vec::new();
138 v.extend(w.clone()); // specializes to `append`
139 assert!(v.iter().eq(w.iter().chain(w.iter())));
142 #[derive(PartialEq, Debug)]
145 let mut a = Vec::new();
146 let b = vec![Foo, Foo];
149 assert_eq!(a, &[Foo, Foo]);
154 let mut x = Vec::new();
155 let y = vec![DropCounter { count: &mut count_x }];
158 assert_eq!(count_x, 1);
162 fn test_extend_from_slice() {
163 let a: Vec<isize> = vec![1, 2, 3, 4, 5];
164 let b: Vec<isize> = vec![6, 7, 8, 9, 0];
166 let mut v: Vec<isize> = a;
168 v.extend_from_slice(&b);
170 assert_eq!(v, [1, 2, 3, 4, 5, 6, 7, 8, 9, 0]);
174 fn test_extend_ref() {
175 let mut v = vec![1, 2];
176 v.extend(&[3, 4, 5]);
178 assert_eq!(v.len(), 5);
179 assert_eq!(v, [1, 2, 3, 4, 5]);
184 assert_eq!(v.len(), 7);
185 assert_eq!(v, [1, 2, 3, 4, 5, 6, 7]);
189 fn test_slice_from_ref() {
190 let values = vec![1, 2, 3, 4, 5];
191 let slice = &values[1..3];
193 assert_eq!(slice, [2, 3]);
197 fn test_slice_from_mut() {
198 let mut values = vec![1, 2, 3, 4, 5];
200 let slice = &mut values[2..];
201 assert!(slice == [3, 4, 5]);
207 assert!(values == [1, 2, 5, 6, 7]);
211 fn test_slice_to_mut() {
212 let mut values = vec![1, 2, 3, 4, 5];
214 let slice = &mut values[..2];
215 assert!(slice == [1, 2]);
221 assert!(values == [2, 3, 3, 4, 5]);
225 fn test_split_at_mut() {
226 let mut values = vec![1, 2, 3, 4, 5];
228 let (left, right) = values.split_at_mut(2);
230 let left: &[_] = left;
231 assert!(&left[..left.len()] == &[1, 2]);
238 let right: &[_] = right;
239 assert!(&right[..right.len()] == &[3, 4, 5]);
246 assert_eq!(values, [2, 3, 5, 6, 7]);
251 let v: Vec<i32> = vec![];
252 let w = vec![1, 2, 3];
254 assert_eq!(v, v.clone());
258 // they should be disjoint in memory.
259 assert!(w.as_ptr() != z.as_ptr())
263 fn test_clone_from() {
265 let three: Vec<Box<_>> = vec![box 1, box 2, box 3];
266 let two: Vec<Box<_>> = vec![box 4, box 5];
268 v.clone_from(&three);
269 assert_eq!(v, three);
272 v.clone_from(&three);
273 assert_eq!(v, three);
280 v.clone_from(&three);
286 let mut vec = vec![1, 2, 3, 4];
287 vec.retain(|&x| x % 2 == 0);
288 assert_eq!(vec, [2, 4]);
292 fn test_retain_pred_panic_with_hole() {
293 let v = (0..5).map(Rc::new).collect::<Vec<_>>();
294 catch_unwind(AssertUnwindSafe(|| {
295 let mut v = v.clone();
296 v.retain(|r| match **r {
304 // Everything is dropped when predicate panicked.
305 assert!(v.iter().all(|r| Rc::strong_count(r) == 1));
309 fn test_retain_pred_panic_no_hole() {
310 let v = (0..5).map(Rc::new).collect::<Vec<_>>();
311 catch_unwind(AssertUnwindSafe(|| {
312 let mut v = v.clone();
313 v.retain(|r| match **r {
319 // Everything is dropped when predicate panicked.
320 assert!(v.iter().all(|r| Rc::strong_count(r) == 1));
324 fn test_retain_drop_panic() {
325 struct Wrap(Rc<i32>);
335 let v = (0..5).map(|x| Rc::new(x)).collect::<Vec<_>>();
336 catch_unwind(AssertUnwindSafe(|| {
337 let mut v = v.iter().map(|r| Wrap(r.clone())).collect::<Vec<_>>();
338 v.retain(|w| match *w.0 {
342 3 => false, // Drop panic.
347 // Other elements are dropped when `drop` of one element panicked.
348 // The panicked wrapper also has its Rc dropped.
349 assert!(v.iter().all(|r| Rc::strong_count(r) == 1));
354 fn case(a: Vec<i32>, b: Vec<i32>) {
359 case(vec![], vec![]);
360 case(vec![1], vec![1]);
361 case(vec![1, 1], vec![1]);
362 case(vec![1, 2, 3], vec![1, 2, 3]);
363 case(vec![1, 1, 2, 3], vec![1, 2, 3]);
364 case(vec![1, 2, 2, 3], vec![1, 2, 3]);
365 case(vec![1, 2, 3, 3], vec![1, 2, 3]);
366 case(vec![1, 1, 2, 2, 2, 3, 3], vec![1, 2, 3]);
370 fn test_dedup_by_key() {
371 fn case(a: Vec<i32>, b: Vec<i32>) {
373 v.dedup_by_key(|i| *i / 10);
376 case(vec![], vec![]);
377 case(vec![10], vec![10]);
378 case(vec![10, 11], vec![10]);
379 case(vec![10, 20, 30], vec![10, 20, 30]);
380 case(vec![10, 11, 20, 30], vec![10, 20, 30]);
381 case(vec![10, 20, 21, 30], vec![10, 20, 30]);
382 case(vec![10, 20, 30, 31], vec![10, 20, 30]);
383 case(vec![10, 11, 20, 21, 22, 30, 31], vec![10, 20, 30]);
388 let mut vec = vec!["foo", "bar", "Bar", "baz", "bar"];
389 vec.dedup_by(|a, b| a.eq_ignore_ascii_case(b));
391 assert_eq!(vec, ["foo", "bar", "baz", "bar"]);
393 let mut vec = vec![("foo", 1), ("foo", 2), ("bar", 3), ("bar", 4), ("bar", 5)];
394 vec.dedup_by(|a, b| {
401 assert_eq!(vec, [("foo", 3), ("bar", 12)]);
405 fn test_dedup_unique() {
406 let mut v0: Vec<Box<_>> = vec![box 1, box 1, box 2, box 3];
408 let mut v1: Vec<Box<_>> = vec![box 1, box 2, box 2, box 3];
410 let mut v2: Vec<Box<_>> = vec![box 1, box 2, box 3, box 3];
412 // If the boxed pointers were leaked or otherwise misused, valgrind
413 // and/or rt should raise errors.
417 fn zero_sized_values() {
418 let mut v = Vec::new();
419 assert_eq!(v.len(), 0);
421 assert_eq!(v.len(), 1);
423 assert_eq!(v.len(), 2);
424 assert_eq!(v.pop(), Some(()));
425 assert_eq!(v.pop(), Some(()));
426 assert_eq!(v.pop(), None);
428 assert_eq!(v.iter().count(), 0);
430 assert_eq!(v.iter().count(), 1);
432 assert_eq!(v.iter().count(), 2);
436 assert_eq!(v.iter_mut().count(), 2);
438 assert_eq!(v.iter_mut().count(), 3);
440 assert_eq!(v.iter_mut().count(), 4);
442 for &mut () in &mut v {}
446 assert_eq!(v.iter_mut().count(), 0);
450 fn test_partition() {
451 assert_eq!(vec![].into_iter().partition(|x: &i32| *x < 3), (vec![], vec![]));
452 assert_eq!(vec![1, 2, 3].into_iter().partition(|x| *x < 4), (vec![1, 2, 3], vec![]));
453 assert_eq!(vec![1, 2, 3].into_iter().partition(|x| *x < 2), (vec![1], vec![2, 3]));
454 assert_eq!(vec![1, 2, 3].into_iter().partition(|x| *x < 0), (vec![], vec![1, 2, 3]));
458 fn test_zip_unzip() {
459 let z1 = vec![(1, 4), (2, 5), (3, 6)];
461 let (left, right): (Vec<_>, Vec<_>) = z1.iter().cloned().unzip();
463 assert_eq!((1, 4), (left[0], right[0]));
464 assert_eq!((2, 5), (left[1], right[1]));
465 assert_eq!((3, 6), (left[2], right[2]));
470 let x: &[isize] = &[1, 2, 3, 4, 5];
471 let cmp: &[isize] = &[1, 2, 3, 4, 5];
472 assert_eq!(&x[..], cmp);
473 let cmp: &[isize] = &[3, 4, 5];
474 assert_eq!(&x[2..], cmp);
475 let cmp: &[isize] = &[1, 2, 3];
476 assert_eq!(&x[..3], cmp);
477 let cmp: &[isize] = &[2, 3, 4];
478 assert_eq!(&x[1..4], cmp);
480 let x: Vec<isize> = vec![1, 2, 3, 4, 5];
481 let cmp: &[isize] = &[1, 2, 3, 4, 5];
482 assert_eq!(&x[..], cmp);
483 let cmp: &[isize] = &[3, 4, 5];
484 assert_eq!(&x[2..], cmp);
485 let cmp: &[isize] = &[1, 2, 3];
486 assert_eq!(&x[..3], cmp);
487 let cmp: &[isize] = &[2, 3, 4];
488 assert_eq!(&x[1..4], cmp);
492 fn test_vec_truncate_drop() {
493 static mut DROPS: u32 = 0;
503 let mut v = vec![Elem(1), Elem(2), Elem(3), Elem(4), Elem(5)];
504 assert_eq!(unsafe { DROPS }, 0);
506 assert_eq!(unsafe { DROPS }, 2);
508 assert_eq!(unsafe { DROPS }, 5);
513 fn test_vec_truncate_fail() {
515 impl Drop for BadElem {
517 let BadElem(ref mut x) = *self;
519 panic!("BadElem panic: 0xbadbeef")
524 let mut v = vec![BadElem(1), BadElem(2), BadElem(0xbadbeef), BadElem(4)];
530 let vec = vec![1, 2, 3];
531 assert!(vec[1] == 2);
536 fn test_index_out_of_bounds() {
537 let vec = vec![1, 2, 3];
543 fn test_slice_out_of_bounds_1() {
544 let x = vec![1, 2, 3, 4, 5];
550 fn test_slice_out_of_bounds_2() {
551 let x = vec![1, 2, 3, 4, 5];
557 fn test_slice_out_of_bounds_3() {
558 let x = vec![1, 2, 3, 4, 5];
564 fn test_slice_out_of_bounds_4() {
565 let x = vec![1, 2, 3, 4, 5];
571 fn test_slice_out_of_bounds_5() {
572 let x = vec![1, 2, 3, 4, 5];
578 fn test_swap_remove_empty() {
579 let mut vec = Vec::<i32>::new();
584 fn test_move_items() {
585 let vec = vec![1, 2, 3];
586 let mut vec2 = vec![];
590 assert_eq!(vec2, [1, 2, 3]);
594 fn test_move_items_reverse() {
595 let vec = vec![1, 2, 3];
596 let mut vec2 = vec![];
597 for i in vec.into_iter().rev() {
600 assert_eq!(vec2, [3, 2, 1]);
604 fn test_move_items_zero_sized() {
605 let vec = vec![(), (), ()];
606 let mut vec2 = vec![];
610 assert_eq!(vec2, [(), (), ()]);
614 fn test_drain_empty_vec() {
615 let mut vec: Vec<i32> = vec![];
616 let mut vec2: Vec<i32> = vec![];
617 for i in vec.drain(..) {
620 assert!(vec.is_empty());
621 assert!(vec2.is_empty());
625 fn test_drain_items() {
626 let mut vec = vec![1, 2, 3];
627 let mut vec2 = vec![];
628 for i in vec.drain(..) {
632 assert_eq!(vec2, [1, 2, 3]);
636 fn test_drain_items_reverse() {
637 let mut vec = vec![1, 2, 3];
638 let mut vec2 = vec![];
639 for i in vec.drain(..).rev() {
643 assert_eq!(vec2, [3, 2, 1]);
647 fn test_drain_items_zero_sized() {
648 let mut vec = vec![(), (), ()];
649 let mut vec2 = vec![];
650 for i in vec.drain(..) {
654 assert_eq!(vec2, [(), (), ()]);
659 fn test_drain_out_of_bounds() {
660 let mut v = vec![1, 2, 3, 4, 5];
665 fn test_drain_range() {
666 let mut v = vec![1, 2, 3, 4, 5];
667 for _ in v.drain(4..) {}
668 assert_eq!(v, &[1, 2, 3, 4]);
670 let mut v: Vec<_> = (1..6).map(|x| x.to_string()).collect();
671 for _ in v.drain(1..4) {}
672 assert_eq!(v, &[1.to_string(), 5.to_string()]);
674 let mut v: Vec<_> = (1..6).map(|x| x.to_string()).collect();
675 for _ in v.drain(1..4).rev() {}
676 assert_eq!(v, &[1.to_string(), 5.to_string()]);
678 let mut v: Vec<_> = vec![(); 5];
679 for _ in v.drain(1..4).rev() {}
680 assert_eq!(v, &[(), ()]);
684 fn test_drain_inclusive_range() {
685 let mut v = vec!['a', 'b', 'c', 'd', 'e'];
686 for _ in v.drain(1..=3) {}
687 assert_eq!(v, &['a', 'e']);
689 let mut v: Vec<_> = (0..=5).map(|x| x.to_string()).collect();
690 for _ in v.drain(1..=5) {}
691 assert_eq!(v, &["0".to_string()]);
693 let mut v: Vec<String> = (0..=5).map(|x| x.to_string()).collect();
694 for _ in v.drain(0..=5) {}
695 assert_eq!(v, Vec::<String>::new());
697 let mut v: Vec<_> = (0..=5).map(|x| x.to_string()).collect();
698 for _ in v.drain(0..=3) {}
699 assert_eq!(v, &["4".to_string(), "5".to_string()]);
701 let mut v: Vec<_> = (0..=1).map(|x| x.to_string()).collect();
702 for _ in v.drain(..=0) {}
703 assert_eq!(v, &["1".to_string()]);
707 fn test_drain_max_vec_size() {
708 let mut v = Vec::<()>::with_capacity(usize::MAX);
710 v.set_len(usize::MAX);
712 for _ in v.drain(usize::MAX - 1..) {}
713 assert_eq!(v.len(), usize::MAX - 1);
715 let mut v = Vec::<()>::with_capacity(usize::MAX);
717 v.set_len(usize::MAX);
719 for _ in v.drain(usize::MAX - 1..=usize::MAX - 1) {}
720 assert_eq!(v.len(), usize::MAX - 1);
725 fn test_drain_index_overflow() {
726 let mut v = Vec::<()>::with_capacity(usize::MAX);
728 v.set_len(usize::MAX);
730 v.drain(0..=usize::MAX);
735 fn test_drain_inclusive_out_of_bounds() {
736 let mut v = vec![1, 2, 3, 4, 5];
742 fn test_drain_start_overflow() {
743 let mut v = vec![1, 2, 3];
744 v.drain((Excluded(usize::MAX), Included(0)));
749 fn test_drain_end_overflow() {
750 let mut v = vec![1, 2, 3];
751 v.drain((Included(0), Included(usize::MAX)));
755 fn test_drain_leak() {
756 static mut DROPS: i32 = 0;
758 #[derive(Debug, PartialEq)]
768 panic!("panic in `drop`");
783 catch_unwind(AssertUnwindSafe(|| {
788 assert_eq!(unsafe { DROPS }, 4);
789 assert_eq!(v, vec![D(0, false), D(1, false), D(6, false),]);
794 let mut v = vec![1, 2, 3, 4, 5];
795 let a = [10, 11, 12];
796 v.splice(2..4, a.iter().cloned());
797 assert_eq!(v, &[1, 2, 10, 11, 12, 5]);
798 v.splice(1..3, Some(20));
799 assert_eq!(v, &[1, 20, 11, 12, 5]);
803 fn test_splice_inclusive_range() {
804 let mut v = vec![1, 2, 3, 4, 5];
805 let a = [10, 11, 12];
806 let t1: Vec<_> = v.splice(2..=3, a.iter().cloned()).collect();
807 assert_eq!(v, &[1, 2, 10, 11, 12, 5]);
808 assert_eq!(t1, &[3, 4]);
809 let t2: Vec<_> = v.splice(1..=2, Some(20)).collect();
810 assert_eq!(v, &[1, 20, 11, 12, 5]);
811 assert_eq!(t2, &[2, 10]);
816 fn test_splice_out_of_bounds() {
817 let mut v = vec![1, 2, 3, 4, 5];
818 let a = [10, 11, 12];
819 v.splice(5..6, a.iter().cloned());
824 fn test_splice_inclusive_out_of_bounds() {
825 let mut v = vec![1, 2, 3, 4, 5];
826 let a = [10, 11, 12];
827 v.splice(5..=5, a.iter().cloned());
831 fn test_splice_items_zero_sized() {
832 let mut vec = vec![(), (), ()];
834 let t: Vec<_> = vec.splice(1..2, vec2.iter().cloned()).collect();
835 assert_eq!(vec, &[(), ()]);
836 assert_eq!(t, &[()]);
840 fn test_splice_unbounded() {
841 let mut vec = vec![1, 2, 3, 4, 5];
842 let t: Vec<_> = vec.splice(.., None).collect();
843 assert_eq!(vec, &[]);
844 assert_eq!(t, &[1, 2, 3, 4, 5]);
848 fn test_splice_forget() {
849 let mut v = vec![1, 2, 3, 4, 5];
850 let a = [10, 11, 12];
851 std::mem::forget(v.splice(2..4, a.iter().cloned()));
852 assert_eq!(v, &[1, 2]);
856 fn test_into_boxed_slice() {
857 let xs = vec![1, 2, 3];
858 let ys = xs.into_boxed_slice();
859 assert_eq!(&*ys, [1, 2, 3]);
864 let mut vec = vec![1, 2, 3];
865 let mut vec2 = vec![4, 5, 6];
866 vec.append(&mut vec2);
867 assert_eq!(vec, [1, 2, 3, 4, 5, 6]);
868 assert_eq!(vec2, []);
872 fn test_split_off() {
873 let mut vec = vec![1, 2, 3, 4, 5, 6];
874 let orig_capacity = vec.capacity();
875 let vec2 = vec.split_off(4);
876 assert_eq!(vec, [1, 2, 3, 4]);
877 assert_eq!(vec2, [5, 6]);
878 assert_eq!(vec.capacity(), orig_capacity);
882 fn test_split_off_take_all() {
883 let mut vec = vec![1, 2, 3, 4, 5, 6];
884 let orig_ptr = vec.as_ptr();
885 let orig_capacity = vec.capacity();
886 let vec2 = vec.split_off(0);
888 assert_eq!(vec2, [1, 2, 3, 4, 5, 6]);
889 assert_eq!(vec.capacity(), orig_capacity);
890 assert_eq!(vec2.as_ptr(), orig_ptr);
894 fn test_into_iter_as_slice() {
895 let vec = vec!['a', 'b', 'c'];
896 let mut into_iter = vec.into_iter();
897 assert_eq!(into_iter.as_slice(), &['a', 'b', 'c']);
898 let _ = into_iter.next().unwrap();
899 assert_eq!(into_iter.as_slice(), &['b', 'c']);
900 let _ = into_iter.next().unwrap();
901 let _ = into_iter.next().unwrap();
902 assert_eq!(into_iter.as_slice(), &[]);
906 fn test_into_iter_as_mut_slice() {
907 let vec = vec!['a', 'b', 'c'];
908 let mut into_iter = vec.into_iter();
909 assert_eq!(into_iter.as_slice(), &['a', 'b', 'c']);
910 into_iter.as_mut_slice()[0] = 'x';
911 into_iter.as_mut_slice()[1] = 'y';
912 assert_eq!(into_iter.next().unwrap(), 'x');
913 assert_eq!(into_iter.as_slice(), &['y', 'c']);
917 fn test_into_iter_debug() {
918 let vec = vec!['a', 'b', 'c'];
919 let into_iter = vec.into_iter();
920 let debug = format!("{:?}", into_iter);
921 assert_eq!(debug, "IntoIter(['a', 'b', 'c'])");
925 fn test_into_iter_count() {
926 assert_eq!(vec![1, 2, 3].into_iter().count(), 3);
930 fn test_into_iter_clone() {
931 fn iter_equal<I: Iterator<Item = i32>>(it: I, slice: &[i32]) {
932 let v: Vec<i32> = it.collect();
933 assert_eq!(&v[..], slice);
935 let mut it = vec![1, 2, 3].into_iter();
936 iter_equal(it.clone(), &[1, 2, 3]);
937 assert_eq!(it.next(), Some(1));
938 let mut it = it.rev();
939 iter_equal(it.clone(), &[3, 2]);
940 assert_eq!(it.next(), Some(3));
941 iter_equal(it.clone(), &[2]);
942 assert_eq!(it.next(), Some(2));
943 iter_equal(it.clone(), &[]);
944 assert_eq!(it.next(), None);
948 fn test_into_iter_leak() {
949 static mut DROPS: i32 = 0;
960 panic!("panic in `drop`");
965 let v = vec![D(false), D(true), D(false)];
967 catch_unwind(move || drop(v.into_iter())).ok();
969 assert_eq!(unsafe { DROPS }, 3);
973 fn test_from_iter_specialization() {
974 let src: Vec<usize> = vec![0usize; 1];
975 let srcptr = src.as_ptr();
976 let sink = src.into_iter().collect::<Vec<_>>();
977 let sinkptr = sink.as_ptr();
978 assert_eq!(srcptr, sinkptr);
982 fn test_from_iter_partially_drained_in_place_specialization() {
983 let src: Vec<usize> = vec![0usize; 10];
984 let srcptr = src.as_ptr();
985 let mut iter = src.into_iter();
988 let sink = iter.collect::<Vec<_>>();
989 let sinkptr = sink.as_ptr();
990 assert_eq!(srcptr, sinkptr);
994 fn test_from_iter_specialization_with_iterator_adapters() {
995 fn assert_in_place_trait<T: InPlaceIterable>(_: &T) {}
996 let src: Vec<usize> = vec![0usize; 256];
997 let srcptr = src.as_ptr();
1002 .zip(std::iter::repeat(1usize))
1003 .map(|(a, b)| a + b)
1004 .map_while(Option::Some)
1007 .map(|e| std::num::NonZeroUsize::new(e));
1008 assert_in_place_trait(&iter);
1009 let sink = iter.collect::<Vec<_>>();
1010 let sinkptr = sink.as_ptr();
1011 assert_eq!(srcptr, sinkptr as *const usize);
1015 fn test_from_iter_specialization_head_tail_drop() {
1016 let drop_count: Vec<_> = (0..=2).map(|_| Rc::new(())).collect();
1017 let src: Vec<_> = drop_count.iter().cloned().collect();
1018 let srcptr = src.as_ptr();
1019 let iter = src.into_iter();
1020 let sink: Vec<_> = iter.skip(1).take(1).collect();
1021 let sinkptr = sink.as_ptr();
1022 assert_eq!(srcptr, sinkptr, "specialization was applied");
1023 assert_eq!(Rc::strong_count(&drop_count[0]), 1, "front was dropped");
1024 assert_eq!(Rc::strong_count(&drop_count[1]), 2, "one element was collected");
1025 assert_eq!(Rc::strong_count(&drop_count[2]), 1, "tail was dropped");
1026 assert_eq!(sink.len(), 1);
1030 fn test_from_iter_specialization_panic_drop() {
1031 let drop_count: Vec<_> = (0..=2).map(|_| Rc::new(())).collect();
1032 let src: Vec<_> = drop_count.iter().cloned().collect();
1033 let iter = src.into_iter();
1035 let _ = std::panic::catch_unwind(AssertUnwindSafe(|| {
1038 .filter_map(|(i, e)| {
1040 std::panic!("aborting iteration");
1044 .collect::<Vec<_>>();
1048 drop_count.iter().map(Rc::strong_count).all(|count| count == 1),
1049 "all items were dropped once"
1054 fn test_cow_from() {
1055 let borrowed: &[_] = &["borrowed", "(slice)"];
1056 let owned = vec!["owned", "(vec)"];
1057 match (Cow::from(owned.clone()), Cow::from(borrowed)) {
1058 (Cow::Owned(o), Cow::Borrowed(b)) => assert!(o == owned && b == borrowed),
1059 _ => panic!("invalid `Cow::from`"),
1064 fn test_from_cow() {
1065 let borrowed: &[_] = &["borrowed", "(slice)"];
1066 let owned = vec!["owned", "(vec)"];
1067 assert_eq!(Vec::from(Cow::Borrowed(borrowed)), vec!["borrowed", "(slice)"]);
1068 assert_eq!(Vec::from(Cow::Owned(owned)), vec!["owned", "(vec)"]);
1072 fn assert_covariance() {
1073 fn drain<'new>(d: Drain<'static, &'static str>) -> Drain<'new, &'new str> {
1076 fn into_iter<'new>(i: IntoIter<&'static str>) -> IntoIter<&'new str> {
1082 fn from_into_inner() {
1083 let vec = vec![1, 2, 3];
1084 let ptr = vec.as_ptr();
1085 let vec = vec.into_iter().collect::<Vec<_>>();
1086 assert_eq!(vec, [1, 2, 3]);
1087 assert_eq!(vec.as_ptr(), ptr);
1089 let ptr = &vec[1] as *const _;
1090 let mut it = vec.into_iter();
1092 let vec = it.collect::<Vec<_>>();
1093 assert_eq!(vec, [2, 3]);
1094 assert!(ptr != vec.as_ptr());
1098 fn overaligned_allocations() {
1101 let mut v = vec![Foo(273)];
1102 for i in 0..0x1000 {
1104 assert!(v[0].0 == 273);
1105 assert!(v.as_ptr() as usize & 0xff == 0);
1107 assert!(v[0].0 == 273);
1108 assert!(v.as_ptr() as usize & 0xff == 0);
1113 fn drain_filter_empty() {
1114 let mut vec: Vec<i32> = vec![];
1117 let mut iter = vec.drain_filter(|_| true);
1118 assert_eq!(iter.size_hint(), (0, Some(0)));
1119 assert_eq!(iter.next(), None);
1120 assert_eq!(iter.size_hint(), (0, Some(0)));
1121 assert_eq!(iter.next(), None);
1122 assert_eq!(iter.size_hint(), (0, Some(0)));
1124 assert_eq!(vec.len(), 0);
1125 assert_eq!(vec, vec![]);
1129 fn drain_filter_zst() {
1130 let mut vec = vec![(), (), (), (), ()];
1131 let initial_len = vec.len();
1134 let mut iter = vec.drain_filter(|_| true);
1135 assert_eq!(iter.size_hint(), (0, Some(initial_len)));
1136 while let Some(_) = iter.next() {
1138 assert_eq!(iter.size_hint(), (0, Some(initial_len - count)));
1140 assert_eq!(iter.size_hint(), (0, Some(0)));
1141 assert_eq!(iter.next(), None);
1142 assert_eq!(iter.size_hint(), (0, Some(0)));
1145 assert_eq!(count, initial_len);
1146 assert_eq!(vec.len(), 0);
1147 assert_eq!(vec, vec![]);
1151 fn drain_filter_false() {
1152 let mut vec = vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
1154 let initial_len = vec.len();
1157 let mut iter = vec.drain_filter(|_| false);
1158 assert_eq!(iter.size_hint(), (0, Some(initial_len)));
1159 for _ in iter.by_ref() {
1162 assert_eq!(iter.size_hint(), (0, Some(0)));
1163 assert_eq!(iter.next(), None);
1164 assert_eq!(iter.size_hint(), (0, Some(0)));
1167 assert_eq!(count, 0);
1168 assert_eq!(vec.len(), initial_len);
1169 assert_eq!(vec, vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);
1173 fn drain_filter_true() {
1174 let mut vec = vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
1176 let initial_len = vec.len();
1179 let mut iter = vec.drain_filter(|_| true);
1180 assert_eq!(iter.size_hint(), (0, Some(initial_len)));
1181 while let Some(_) = iter.next() {
1183 assert_eq!(iter.size_hint(), (0, Some(initial_len - count)));
1185 assert_eq!(iter.size_hint(), (0, Some(0)));
1186 assert_eq!(iter.next(), None);
1187 assert_eq!(iter.size_hint(), (0, Some(0)));
1190 assert_eq!(count, initial_len);
1191 assert_eq!(vec.len(), 0);
1192 assert_eq!(vec, vec![]);
1196 fn drain_filter_complex() {
1198 // [+xxx++++++xxxxx++++x+x++]
1200 1, 2, 4, 6, 7, 9, 11, 13, 15, 17, 18, 20, 22, 24, 26, 27, 29, 31, 33, 34, 35, 36, 37,
1204 let removed = vec.drain_filter(|x| *x % 2 == 0).collect::<Vec<_>>();
1205 assert_eq!(removed.len(), 10);
1206 assert_eq!(removed, vec![2, 4, 6, 18, 20, 22, 24, 26, 34, 36]);
1208 assert_eq!(vec.len(), 14);
1209 assert_eq!(vec, vec![1, 7, 9, 11, 13, 15, 17, 27, 29, 31, 33, 35, 37, 39]);
1213 // [xxx++++++xxxxx++++x+x++]
1215 2, 4, 6, 7, 9, 11, 13, 15, 17, 18, 20, 22, 24, 26, 27, 29, 31, 33, 34, 35, 36, 37, 39,
1218 let removed = vec.drain_filter(|x| *x % 2 == 0).collect::<Vec<_>>();
1219 assert_eq!(removed.len(), 10);
1220 assert_eq!(removed, vec![2, 4, 6, 18, 20, 22, 24, 26, 34, 36]);
1222 assert_eq!(vec.len(), 13);
1223 assert_eq!(vec, vec![7, 9, 11, 13, 15, 17, 27, 29, 31, 33, 35, 37, 39]);
1227 // [xxx++++++xxxxx++++x+x]
1229 vec![2, 4, 6, 7, 9, 11, 13, 15, 17, 18, 20, 22, 24, 26, 27, 29, 31, 33, 34, 35, 36];
1231 let removed = vec.drain_filter(|x| *x % 2 == 0).collect::<Vec<_>>();
1232 assert_eq!(removed.len(), 10);
1233 assert_eq!(removed, vec![2, 4, 6, 18, 20, 22, 24, 26, 34, 36]);
1235 assert_eq!(vec.len(), 11);
1236 assert_eq!(vec, vec![7, 9, 11, 13, 15, 17, 27, 29, 31, 33, 35]);
1240 // [xxxxxxxxxx+++++++++++]
1241 let mut vec = vec![2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 1, 3, 5, 7, 9, 11, 13, 15, 17, 19];
1243 let removed = vec.drain_filter(|x| *x % 2 == 0).collect::<Vec<_>>();
1244 assert_eq!(removed.len(), 10);
1245 assert_eq!(removed, vec![2, 4, 6, 8, 10, 12, 14, 16, 18, 20]);
1247 assert_eq!(vec.len(), 10);
1248 assert_eq!(vec, vec![1, 3, 5, 7, 9, 11, 13, 15, 17, 19]);
1252 // [+++++++++++xxxxxxxxxx]
1253 let mut vec = vec![1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20];
1255 let removed = vec.drain_filter(|x| *x % 2 == 0).collect::<Vec<_>>();
1256 assert_eq!(removed.len(), 10);
1257 assert_eq!(removed, vec![2, 4, 6, 8, 10, 12, 14, 16, 18, 20]);
1259 assert_eq!(vec.len(), 10);
1260 assert_eq!(vec, vec![1, 3, 5, 7, 9, 11, 13, 15, 17, 19]);
1264 // FIXME: re-enable emscripten once it can unwind again
1266 #[cfg(not(target_os = "emscripten"))]
1267 fn drain_filter_consumed_panic() {
1269 use std::sync::Mutex;
1273 drop_counts: Rc<Mutex<Vec<usize>>>,
1276 impl Drop for Check {
1277 fn drop(&mut self) {
1278 self.drop_counts.lock().unwrap()[self.index] += 1;
1279 println!("drop: {}", self.index);
1283 let check_count = 10;
1284 let drop_counts = Rc::new(Mutex::new(vec![0_usize; check_count]));
1285 let mut data: Vec<Check> = (0..check_count)
1286 .map(|index| Check { index, drop_counts: Rc::clone(&drop_counts) })
1289 let _ = std::panic::catch_unwind(move || {
1290 let filter = |c: &mut Check| {
1292 panic!("panic at index: {}", c.index);
1294 // Verify that if the filter could panic again on another element
1295 // that it would not cause a double panic and all elements of the
1296 // vec would still be dropped exactly once.
1298 panic!("panic at index: {}", c.index);
1302 let drain = data.drain_filter(filter);
1304 // NOTE: The DrainFilter is explicitly consumed
1305 drain.for_each(drop);
1308 let drop_counts = drop_counts.lock().unwrap();
1309 assert_eq!(check_count, drop_counts.len());
1311 for (index, count) in drop_counts.iter().cloned().enumerate() {
1312 assert_eq!(1, count, "unexpected drop count at index: {} (count: {})", index, count);
1316 // FIXME: Re-enable emscripten once it can catch panics
1318 #[cfg(not(target_os = "emscripten"))]
1319 fn drain_filter_unconsumed_panic() {
1321 use std::sync::Mutex;
1325 drop_counts: Rc<Mutex<Vec<usize>>>,
1328 impl Drop for Check {
1329 fn drop(&mut self) {
1330 self.drop_counts.lock().unwrap()[self.index] += 1;
1331 println!("drop: {}", self.index);
1335 let check_count = 10;
1336 let drop_counts = Rc::new(Mutex::new(vec![0_usize; check_count]));
1337 let mut data: Vec<Check> = (0..check_count)
1338 .map(|index| Check { index, drop_counts: Rc::clone(&drop_counts) })
1341 let _ = std::panic::catch_unwind(move || {
1342 let filter = |c: &mut Check| {
1344 panic!("panic at index: {}", c.index);
1346 // Verify that if the filter could panic again on another element
1347 // that it would not cause a double panic and all elements of the
1348 // vec would still be dropped exactly once.
1350 panic!("panic at index: {}", c.index);
1354 let _drain = data.drain_filter(filter);
1356 // NOTE: The DrainFilter is dropped without being consumed
1359 let drop_counts = drop_counts.lock().unwrap();
1360 assert_eq!(check_count, drop_counts.len());
1362 for (index, count) in drop_counts.iter().cloned().enumerate() {
1363 assert_eq!(1, count, "unexpected drop count at index: {} (count: {})", index, count);
1368 fn drain_filter_unconsumed() {
1369 let mut vec = vec![1, 2, 3, 4];
1370 let drain = vec.drain_filter(|&mut x| x % 2 != 0);
1372 assert_eq!(vec, [2, 4]);
1376 fn test_reserve_exact() {
1377 // This is all the same as test_reserve
1379 let mut v = Vec::new();
1380 assert_eq!(v.capacity(), 0);
1383 assert!(v.capacity() >= 2);
1389 assert!(v.capacity() >= 16);
1390 v.reserve_exact(16);
1391 assert!(v.capacity() >= 32);
1395 v.reserve_exact(16);
1396 assert!(v.capacity() >= 33)
1400 #[cfg_attr(miri, ignore)] // Miri does not support signalling OOM
1401 #[cfg_attr(target_os = "android", ignore)] // Android used in CI has a broken dlmalloc
1402 fn test_try_reserve() {
1403 // These are the interesting cases:
1404 // * exactly isize::MAX should never trigger a CapacityOverflow (can be OOM)
1405 // * > isize::MAX should always fail
1406 // * On 16/32-bit should CapacityOverflow
1407 // * On 64-bit should OOM
1408 // * overflow may trigger when adding `len` to `cap` (in number of elements)
1409 // * overflow may trigger when multiplying `new_cap` by size_of::<T> (to get bytes)
1411 const MAX_CAP: usize = isize::MAX as usize;
1412 const MAX_USIZE: usize = usize::MAX;
1414 // On 16/32-bit, we check that allocations don't exceed isize::MAX,
1415 // on 64-bit, we assume the OS will give an OOM for such a ridiculous size.
1416 // Any platform that succeeds for these requests is technically broken with
1417 // ptr::offset because LLVM is the worst.
1418 let guards_against_isize = usize::BITS < 64;
1421 // Note: basic stuff is checked by test_reserve
1422 let mut empty_bytes: Vec<u8> = Vec::new();
1424 // Check isize::MAX doesn't count as an overflow
1425 if let Err(CapacityOverflow) = empty_bytes.try_reserve(MAX_CAP) {
1426 panic!("isize::MAX shouldn't trigger an overflow!");
1428 // Play it again, frank! (just to be sure)
1429 if let Err(CapacityOverflow) = empty_bytes.try_reserve(MAX_CAP) {
1430 panic!("isize::MAX shouldn't trigger an overflow!");
1433 if guards_against_isize {
1434 // Check isize::MAX + 1 does count as overflow
1435 if let Err(CapacityOverflow) = empty_bytes.try_reserve(MAX_CAP + 1) {
1437 panic!("isize::MAX + 1 should trigger an overflow!")
1440 // Check usize::MAX does count as overflow
1441 if let Err(CapacityOverflow) = empty_bytes.try_reserve(MAX_USIZE) {
1443 panic!("usize::MAX should trigger an overflow!")
1446 // Check isize::MAX + 1 is an OOM
1447 if let Err(AllocError { .. }) = empty_bytes.try_reserve(MAX_CAP + 1) {
1449 panic!("isize::MAX + 1 should trigger an OOM!")
1452 // Check usize::MAX is an OOM
1453 if let Err(AllocError { .. }) = empty_bytes.try_reserve(MAX_USIZE) {
1455 panic!("usize::MAX should trigger an OOM!")
1461 // Same basic idea, but with non-zero len
1462 let mut ten_bytes: Vec<u8> = vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
1464 if let Err(CapacityOverflow) = ten_bytes.try_reserve(MAX_CAP - 10) {
1465 panic!("isize::MAX shouldn't trigger an overflow!");
1467 if let Err(CapacityOverflow) = ten_bytes.try_reserve(MAX_CAP - 10) {
1468 panic!("isize::MAX shouldn't trigger an overflow!");
1470 if guards_against_isize {
1471 if let Err(CapacityOverflow) = ten_bytes.try_reserve(MAX_CAP - 9) {
1473 panic!("isize::MAX + 1 should trigger an overflow!");
1476 if let Err(AllocError { .. }) = ten_bytes.try_reserve(MAX_CAP - 9) {
1478 panic!("isize::MAX + 1 should trigger an OOM!")
1481 // Should always overflow in the add-to-len
1482 if let Err(CapacityOverflow) = ten_bytes.try_reserve(MAX_USIZE) {
1484 panic!("usize::MAX should trigger an overflow!")
1489 // Same basic idea, but with interesting type size
1490 let mut ten_u32s: Vec<u32> = vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
1492 if let Err(CapacityOverflow) = ten_u32s.try_reserve(MAX_CAP / 4 - 10) {
1493 panic!("isize::MAX shouldn't trigger an overflow!");
1495 if let Err(CapacityOverflow) = ten_u32s.try_reserve(MAX_CAP / 4 - 10) {
1496 panic!("isize::MAX shouldn't trigger an overflow!");
1498 if guards_against_isize {
1499 if let Err(CapacityOverflow) = ten_u32s.try_reserve(MAX_CAP / 4 - 9) {
1501 panic!("isize::MAX + 1 should trigger an overflow!");
1504 if let Err(AllocError { .. }) = ten_u32s.try_reserve(MAX_CAP / 4 - 9) {
1506 panic!("isize::MAX + 1 should trigger an OOM!")
1509 // Should fail in the mul-by-size
1510 if let Err(CapacityOverflow) = ten_u32s.try_reserve(MAX_USIZE - 20) {
1512 panic!("usize::MAX should trigger an overflow!");
1518 #[cfg_attr(miri, ignore)] // Miri does not support signalling OOM
1519 #[cfg_attr(target_os = "android", ignore)] // Android used in CI has a broken dlmalloc
1520 fn test_try_reserve_exact() {
1521 // This is exactly the same as test_try_reserve with the method changed.
1522 // See that test for comments.
1524 const MAX_CAP: usize = isize::MAX as usize;
1525 const MAX_USIZE: usize = usize::MAX;
1527 let guards_against_isize = size_of::<usize>() < 8;
1530 let mut empty_bytes: Vec<u8> = Vec::new();
1532 if let Err(CapacityOverflow) = empty_bytes.try_reserve_exact(MAX_CAP) {
1533 panic!("isize::MAX shouldn't trigger an overflow!");
1535 if let Err(CapacityOverflow) = empty_bytes.try_reserve_exact(MAX_CAP) {
1536 panic!("isize::MAX shouldn't trigger an overflow!");
1539 if guards_against_isize {
1540 if let Err(CapacityOverflow) = empty_bytes.try_reserve_exact(MAX_CAP + 1) {
1542 panic!("isize::MAX + 1 should trigger an overflow!")
1545 if let Err(CapacityOverflow) = empty_bytes.try_reserve_exact(MAX_USIZE) {
1547 panic!("usize::MAX should trigger an overflow!")
1550 if let Err(AllocError { .. }) = empty_bytes.try_reserve_exact(MAX_CAP + 1) {
1552 panic!("isize::MAX + 1 should trigger an OOM!")
1555 if let Err(AllocError { .. }) = empty_bytes.try_reserve_exact(MAX_USIZE) {
1557 panic!("usize::MAX should trigger an OOM!")
1563 let mut ten_bytes: Vec<u8> = vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
1565 if let Err(CapacityOverflow) = ten_bytes.try_reserve_exact(MAX_CAP - 10) {
1566 panic!("isize::MAX shouldn't trigger an overflow!");
1568 if let Err(CapacityOverflow) = ten_bytes.try_reserve_exact(MAX_CAP - 10) {
1569 panic!("isize::MAX shouldn't trigger an overflow!");
1571 if guards_against_isize {
1572 if let Err(CapacityOverflow) = ten_bytes.try_reserve_exact(MAX_CAP - 9) {
1574 panic!("isize::MAX + 1 should trigger an overflow!");
1577 if let Err(AllocError { .. }) = ten_bytes.try_reserve_exact(MAX_CAP - 9) {
1579 panic!("isize::MAX + 1 should trigger an OOM!")
1582 if let Err(CapacityOverflow) = ten_bytes.try_reserve_exact(MAX_USIZE) {
1584 panic!("usize::MAX should trigger an overflow!")
1589 let mut ten_u32s: Vec<u32> = vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
1591 if let Err(CapacityOverflow) = ten_u32s.try_reserve_exact(MAX_CAP / 4 - 10) {
1592 panic!("isize::MAX shouldn't trigger an overflow!");
1594 if let Err(CapacityOverflow) = ten_u32s.try_reserve_exact(MAX_CAP / 4 - 10) {
1595 panic!("isize::MAX shouldn't trigger an overflow!");
1597 if guards_against_isize {
1598 if let Err(CapacityOverflow) = ten_u32s.try_reserve_exact(MAX_CAP / 4 - 9) {
1600 panic!("isize::MAX + 1 should trigger an overflow!");
1603 if let Err(AllocError { .. }) = ten_u32s.try_reserve_exact(MAX_CAP / 4 - 9) {
1605 panic!("isize::MAX + 1 should trigger an OOM!")
1608 if let Err(CapacityOverflow) = ten_u32s.try_reserve_exact(MAX_USIZE - 20) {
1610 panic!("usize::MAX should trigger an overflow!")
1616 fn test_stable_pointers() {
1617 /// Pull an element from the iterator, then drop it.
1618 /// Useful to cover both the `next` and `drop` paths of an iterator.
1619 fn next_then_drop<I: Iterator>(mut i: I) {
1624 // Test that, if we reserved enough space, adding and removing elements does not
1625 // invalidate references into the vector (such as `v0`). This test also
1626 // runs in Miri, which would detect such problems.
1627 // Note that this test does *not* constitute a stable guarantee that all these functions do not
1628 // reallocate! Only what is explicitly documented at
1629 // <https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#guarantees> is stably guaranteed.
1630 let mut v = Vec::with_capacity(128);
1633 // Laundering the lifetime -- we take care that `v` does not reallocate, so that's okay.
1635 let v0 = unsafe { &mut *(v0 as *mut _) };
1636 // Now do a bunch of things and occasionally use `v0` again to assert it is still valid.
1638 // Pushing/inserting and popping/removing
1642 assert_eq!(*v0, 13);
1645 assert_eq!(*v0, 13);
1648 assert_eq!(v.len(), 2);
1649 v.swap_remove(1); // swap_remove the last element
1650 assert_eq!(*v0, 13);
1653 v.append(&mut vec![27, 19]);
1654 assert_eq!(*v0, 13);
1657 v.extend_from_slice(&[1, 2]);
1658 v.extend(&[1, 2]); // `slice::Iter` (with `T: Copy`) specialization
1659 v.extend(vec![2, 3]); // `vec::IntoIter` specialization
1660 v.extend(std::iter::once(3)); // `TrustedLen` specialization
1661 v.extend(std::iter::empty::<i32>()); // `TrustedLen` specialization with empty iterator
1662 v.extend(std::iter::once(3).filter(|_| true)); // base case
1663 v.extend(std::iter::once(&3)); // `cloned` specialization
1664 assert_eq!(*v0, 13);
1668 assert_eq!(*v0, 13);
1671 v.resize_with(v.len() + 10, || 42);
1672 assert_eq!(*v0, 13);
1673 v.resize_with(2, || panic!());
1674 assert_eq!(*v0, 13);
1676 // No-op reservation
1678 v.reserve_exact(32);
1679 assert_eq!(*v0, 13);
1682 v.resize_with(10, || 42);
1683 next_then_drop(v.drain(5..));
1684 assert_eq!(*v0, 13);
1687 v.resize_with(10, || 42);
1688 next_then_drop(v.splice(5.., vec![1, 2, 3, 4, 5])); // empty tail after range
1689 assert_eq!(*v0, 13);
1690 next_then_drop(v.splice(5..8, vec![1])); // replacement is smaller than original range
1691 assert_eq!(*v0, 13);
1692 next_then_drop(v.splice(5..6, vec![1; 10].into_iter().filter(|_| true))); // lower bound not exact
1693 assert_eq!(*v0, 13);
1695 // spare_capacity_mut
1696 v.spare_capacity_mut();
1697 assert_eq!(*v0, 13);
1699 // Smoke test that would fire even outside Miri if an actual relocation happened.
1701 assert_eq!(v[0], 0);
1704 // https://github.com/rust-lang/rust/pull/49496 introduced specialization based on:
1707 // unsafe impl<T: ?Sized> IsZero for *mut T {
1708 // fn is_zero(&self) -> bool {
1709 // (*self).is_null()
1714 // … to call `RawVec::with_capacity_zeroed` for creating `Vec<*mut T>`,
1715 // which is incorrect for fat pointers since `<*mut T>::is_null` only looks at the data component.
1716 // That is, a fat pointer can be “null” without being made entirely of zero bits.
1718 fn vec_macro_repeating_null_raw_fat_pointer() {
1719 let raw_dyn = &mut (|| ()) as &mut dyn Fn() as *mut dyn Fn();
1720 let vtable = dbg!(ptr_metadata(raw_dyn));
1721 let null_raw_dyn = ptr_from_raw_parts(std::ptr::null_mut(), vtable);
1722 assert!(null_raw_dyn.is_null());
1724 let vec = vec![null_raw_dyn; 1];
1725 dbg!(ptr_metadata(vec[0]));
1726 assert!(vec[0] == null_raw_dyn);
1728 // Polyfill for https://github.com/rust-lang/rfcs/pull/2580
1730 fn ptr_metadata(ptr: *mut dyn Fn()) -> *mut () {
1731 unsafe { std::mem::transmute::<*mut dyn Fn(), DynRepr>(ptr).vtable }
1734 fn ptr_from_raw_parts(data: *mut (), vtable: *mut ()) -> *mut dyn Fn() {
1735 unsafe { std::mem::transmute::<DynRepr, *mut dyn Fn()>(DynRepr { data, vtable }) }
1745 // This test will likely fail if you change the capacities used in
1746 // `RawVec::grow_amortized`.
1748 fn test_push_growth_strategy() {
1749 // If the element size is 1, we jump from 0 to 8, then double.
1751 let mut v1: Vec<u8> = vec![];
1752 assert_eq!(v1.capacity(), 0);
1756 assert_eq!(v1.capacity(), 8);
1761 assert_eq!(v1.capacity(), 16);
1766 assert_eq!(v1.capacity(), 32);
1771 assert_eq!(v1.capacity(), 64);
1775 // If the element size is 2..=1024, we jump from 0 to 4, then double.
1777 let mut v2: Vec<u16> = vec![];
1778 let mut v1024: Vec<[u8; 1024]> = vec![];
1779 assert_eq!(v2.capacity(), 0);
1780 assert_eq!(v1024.capacity(), 0);
1784 v1024.push([0; 1024]);
1785 assert_eq!(v2.capacity(), 4);
1786 assert_eq!(v1024.capacity(), 4);
1791 v1024.push([0; 1024]);
1792 assert_eq!(v2.capacity(), 8);
1793 assert_eq!(v1024.capacity(), 8);
1798 v1024.push([0; 1024]);
1799 assert_eq!(v2.capacity(), 16);
1800 assert_eq!(v1024.capacity(), 16);
1805 v1024.push([0; 1024]);
1806 assert_eq!(v2.capacity(), 32);
1807 assert_eq!(v1024.capacity(), 32);
1812 v1024.push([0; 1024]);
1813 assert_eq!(v2.capacity(), 64);
1814 assert_eq!(v1024.capacity(), 64);
1818 // If the element size is > 1024, we jump from 0 to 1, then double.
1820 let mut v1025: Vec<[u8; 1025]> = vec![];
1821 assert_eq!(v1025.capacity(), 0);
1824 v1025.push([0; 1025]);
1825 assert_eq!(v1025.capacity(), 1);
1829 v1025.push([0; 1025]);
1830 assert_eq!(v1025.capacity(), 2);
1834 v1025.push([0; 1025]);
1835 assert_eq!(v1025.capacity(), 4);
1839 v1025.push([0; 1025]);
1840 assert_eq!(v1025.capacity(), 8);
1844 v1025.push([0; 1025]);
1845 assert_eq!(v1025.capacity(), 16);
1849 v1025.push([0; 1025]);
1850 assert_eq!(v1025.capacity(), 32);
1854 v1025.push([0; 1025]);
1855 assert_eq!(v1025.capacity(), 64);
1860 macro_rules! generate_assert_eq_vec_and_prim {
1861 ($name:ident<$B:ident>($type:ty)) => {
1862 fn $name<A: PartialEq<$B> + Debug, $B: Debug>(a: Vec<A>, b: $type) {
1869 generate_assert_eq_vec_and_prim! { assert_eq_vec_and_slice <B>(&[B]) }
1870 generate_assert_eq_vec_and_prim! { assert_eq_vec_and_array_3<B>([B; 3]) }
1873 fn partialeq_vec_and_prim() {
1874 assert_eq_vec_and_slice(vec![1, 2, 3], &[1, 2, 3]);
1875 assert_eq_vec_and_array_3(vec![1, 2, 3], [1, 2, 3]);
1878 macro_rules! assert_partial_eq_valid {
1879 ($a2:expr, $a3:expr; $b2:expr, $b3: expr) => {
1880 assert!($a2 == $b2);
1881 assert!($a2 != $b3);
1882 assert!($a3 != $b2);
1883 assert!($a3 == $b3);
1884 assert_eq!($a2, $b2);
1885 assert_ne!($a2, $b3);
1886 assert_ne!($a3, $b2);
1887 assert_eq!($a3, $b3);
1892 fn partialeq_vec_full() {
1893 let vec2: Vec<_> = vec![1, 2];
1894 let vec3: Vec<_> = vec![1, 2, 3];
1895 let slice2: &[_] = &[1, 2];
1896 let slice3: &[_] = &[1, 2, 3];
1897 let slicemut2: &[_] = &mut [1, 2];
1898 let slicemut3: &[_] = &mut [1, 2, 3];
1899 let array2: [_; 2] = [1, 2];
1900 let array3: [_; 3] = [1, 2, 3];
1901 let arrayref2: &[_; 2] = &[1, 2];
1902 let arrayref3: &[_; 3] = &[1, 2, 3];
1904 assert_partial_eq_valid!(vec2,vec3; vec2,vec3);
1905 assert_partial_eq_valid!(vec2,vec3; slice2,slice3);
1906 assert_partial_eq_valid!(vec2,vec3; slicemut2,slicemut3);
1907 assert_partial_eq_valid!(slice2,slice3; vec2,vec3);
1908 assert_partial_eq_valid!(slicemut2,slicemut3; vec2,vec3);
1909 assert_partial_eq_valid!(vec2,vec3; array2,array3);
1910 assert_partial_eq_valid!(vec2,vec3; arrayref2,arrayref3);
1911 assert_partial_eq_valid!(vec2,vec3; arrayref2[..],arrayref3[..]);
1915 fn test_vec_cycle() {
1918 v: Vec<Cell<Option<&'a C<'a>>>>,
1927 let mut c1 = C::new();
1928 let mut c2 = C::new();
1929 let mut c3 = C::new();
1932 c1.v.push(Cell::new(None));
1933 c1.v.push(Cell::new(None));
1935 c2.v.push(Cell::new(None));
1936 c2.v.push(Cell::new(None));
1938 c3.v.push(Cell::new(None));
1939 c3.v.push(Cell::new(None));
1942 c1.v[0].set(Some(&c2));
1943 c1.v[1].set(Some(&c3));
1945 c2.v[0].set(Some(&c2));
1946 c2.v[1].set(Some(&c3));
1948 c3.v[0].set(Some(&c1));
1949 c3.v[1].set(Some(&c2));
1953 fn test_vec_cycle_wrapped() {
1955 v: Vec<Cell<Option<&'a C<'a>>>>,
1963 fn new() -> Refs<'a> {
1964 Refs { v: Vec::new() }
1970 C { refs: Refs::new() }
1974 let mut c1 = C::new();
1975 let mut c2 = C::new();
1976 let mut c3 = C::new();
1978 c1.refs.v.push(Cell::new(None));
1979 c1.refs.v.push(Cell::new(None));
1980 c2.refs.v.push(Cell::new(None));
1981 c2.refs.v.push(Cell::new(None));
1982 c3.refs.v.push(Cell::new(None));
1983 c3.refs.v.push(Cell::new(None));
1985 c1.refs.v[0].set(Some(&c2));
1986 c1.refs.v[1].set(Some(&c3));
1987 c2.refs.v[0].set(Some(&c2));
1988 c2.refs.v[1].set(Some(&c3));
1989 c3.refs.v[0].set(Some(&c1));
1990 c3.refs.v[1].set(Some(&c2));
1994 fn test_zero_sized_vec_push() {
1998 let mut tester = Vec::with_capacity(len);
1999 assert_eq!(tester.len(), 0);
2000 assert!(tester.capacity() >= len);
2004 assert_eq!(tester.len(), len);
2005 assert_eq!(tester.iter().count(), len);
2011 fn test_vec_macro_repeat() {
2012 assert_eq!(vec![1; 3], vec![1, 1, 1]);
2013 assert_eq!(vec![1; 2], vec![1, 1]);
2014 assert_eq!(vec![1; 1], vec![1]);
2015 assert_eq!(vec![1; 0], vec![]);
2017 // from_elem syntax (see RFC 832)
2018 let el = Box::new(1);
2020 assert_eq!(vec![el; n], vec![Box::new(1), Box::new(1), Box::new(1)]);
2024 fn test_vec_swap() {
2025 let mut a: Vec<isize> = vec![0, 1, 2, 3, 4, 5, 6];
2027 assert_eq!(a[2], 4);
2028 assert_eq!(a[4], 2);
2030 swap(&mut n, &mut a[0]);
2031 assert_eq!(a[0], 42);
2036 fn test_extend_from_within_spec() {
2040 impl Clone for CopyOnly {
2041 fn clone(&self) -> Self {
2042 panic!("extend_from_within must use specialization on copy");
2046 vec![CopyOnly, CopyOnly].extend_from_within(..);
2050 fn test_extend_from_within_clone() {
2051 let mut v = vec![String::from("sssss"), String::from("12334567890"), String::from("c")];
2052 v.extend_from_within(1..);
2054 assert_eq!(v, ["sssss", "12334567890", "c", "12334567890", "c"]);
2058 fn test_extend_from_within_complete_rande() {
2059 let mut v = vec![0, 1, 2, 3];
2060 v.extend_from_within(..);
2062 assert_eq!(v, [0, 1, 2, 3, 0, 1, 2, 3]);
2066 fn test_extend_from_within_empty_rande() {
2067 let mut v = vec![0, 1, 2, 3];
2068 v.extend_from_within(1..1);
2070 assert_eq!(v, [0, 1, 2, 3]);
2075 fn test_extend_from_within_out_of_rande() {
2076 let mut v = vec![0, 1];
2077 v.extend_from_within(..3);
2081 fn test_extend_from_within_zst() {
2082 let mut v = vec![(); 8];
2083 v.extend_from_within(3..7);
2085 assert_eq!(v, [(); 12]);
2089 fn test_extend_from_within_empty_vec() {
2090 let mut v = Vec::<i32>::new();
2091 v.extend_from_within(..);
2097 fn test_extend_from_within() {
2098 let mut v = vec![String::from("a"), String::from("b"), String::from("c")];
2099 v.extend_from_within(1..=2);
2100 v.extend_from_within(..=1);
2102 assert_eq!(v, ["a", "b", "c", "b", "c", "a", "b"]);
2106 fn test_vec_dedup_by() {
2107 let mut vec: Vec<i32> = vec![1, -1, 2, 3, 1, -5, 5, -2, 2];
2109 vec.dedup_by(|a, b| a.abs() == b.abs());
2111 assert_eq!(vec, [1, 2, 3, 1, -5, -2]);
2115 fn test_vec_dedup_empty() {
2116 let mut vec: Vec<i32> = Vec::new();
2120 assert_eq!(vec, []);
2124 fn test_vec_dedup_one() {
2125 let mut vec = vec![12i32];
2129 assert_eq!(vec, [12]);
2133 fn test_vec_dedup_multiple_ident() {
2134 let mut vec = vec![12, 12, 12, 12, 12, 11, 11, 11, 11, 11, 11];
2138 assert_eq!(vec, [12, 11]);
2142 fn test_vec_dedup_partialeq() {
2144 struct Foo(i32, i32);
2146 impl PartialEq for Foo {
2147 fn eq(&self, other: &Foo) -> bool {
2152 let mut vec = vec![Foo(0, 1), Foo(0, 5), Foo(1, 7), Foo(1, 9)];
2155 assert_eq!(vec, [Foo(0, 1), Foo(1, 7)]);
2159 fn test_vec_dedup() {
2160 let mut vec: Vec<bool> = Vec::with_capacity(8);
2161 let mut template = vec.clone();
2163 for x in 0u8..255u8 {
2167 let iter = (0..8).map(move |bit| (x >> bit) & 1 == 1);
2169 template.extend_from_slice(&vec);
2171 let (dedup, _) = template.partition_dedup();
2174 assert_eq!(vec, dedup);
2179 fn test_vec_dedup_panicking() {
2182 drop_counter: &'static AtomicU32,
2187 impl PartialEq for Panic {
2188 fn eq(&self, other: &Self) -> bool {
2189 self.value == other.value
2193 impl Drop for Panic {
2194 fn drop(&mut self) {
2195 let x = self.drop_counter.fetch_add(1, Ordering::SeqCst);
2200 static DROP_COUNTER: AtomicU32 = AtomicU32::new(0);
2202 Panic { drop_counter: &DROP_COUNTER, value: false, index: 0 },
2203 Panic { drop_counter: &DROP_COUNTER, value: false, index: 5 },
2204 Panic { drop_counter: &DROP_COUNTER, value: true, index: 6 },
2205 Panic { drop_counter: &DROP_COUNTER, value: true, index: 7 },
2208 Panic { drop_counter: &DROP_COUNTER, value: false, index: 0 },
2209 // these elements get deduplicated
2210 Panic { drop_counter: &DROP_COUNTER, value: false, index: 1 },
2211 Panic { drop_counter: &DROP_COUNTER, value: false, index: 2 },
2212 Panic { drop_counter: &DROP_COUNTER, value: false, index: 3 },
2213 Panic { drop_counter: &DROP_COUNTER, value: false, index: 4 },
2215 Panic { drop_counter: &DROP_COUNTER, value: false, index: 5 },
2216 Panic { drop_counter: &DROP_COUNTER, value: true, index: 6 },
2217 Panic { drop_counter: &DROP_COUNTER, value: true, index: 7 },
2220 let _ = std::panic::catch_unwind(std::panic::AssertUnwindSafe(|| {
2224 let ok = vec.iter().zip(expected.iter()).all(|(x, y)| x.index == y.index);
2227 panic!("expected: {:?}\ngot: {:?}\n", expected, vec);
2231 // Regression test for issue #82533
2233 fn test_extend_from_within_panicing_clone() {
2235 drop_count: &'dc AtomicU32,
2239 impl Clone for Panic<'_> {
2240 fn clone(&self) -> Self {
2242 panic!("panic! at the clone");
2249 impl Drop for Panic<'_> {
2250 fn drop(&mut self) {
2251 self.drop_count.fetch_add(1, Ordering::SeqCst);
2255 let count = core::sync::atomic::AtomicU32::new(0);
2257 Panic { drop_count: &count, aaaaa: false },
2258 Panic { drop_count: &count, aaaaa: true },
2259 Panic { drop_count: &count, aaaaa: false },
2262 // This should clone&append one Panic{..} at the end, and then panic while
2263 // cloning second Panic{..}. This means that `Panic::drop` should be called
2264 // 4 times (3 for items already in vector, 1 for just appended).
2266 // Previously just appended item was leaked, making drop_count = 3, instead of 4.
2267 std::panic::catch_unwind(move || vec.extend_from_within(..)).unwrap_err();
2269 assert_eq!(count.load(Ordering::SeqCst), 4);