1 // Copyright 2014 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 use std::ascii::AsciiExt;
13 use std::mem::size_of;
15 use std::vec::{Drain, IntoIter};
17 struct DropCounter<'a> {
21 impl<'a> Drop for DropCounter<'a> {
28 fn test_small_vec_struct() {
29 assert!(size_of::<Vec<u8>>() == size_of::<usize>() * 3);
33 fn test_double_drop() {
39 let (mut count_x, mut count_y) = (0, 0);
45 tv.x.push(DropCounter { count: &mut count_x });
46 tv.y.push(DropCounter { count: &mut count_y });
48 // If Vec had a drop flag, here is where it would be zeroed.
49 // Instead, it should rely on its internal state to prevent
50 // doing anything significant when dropped multiple times.
53 // Here tv goes out of scope, tv.y should be dropped, but not tv.x.
56 assert_eq!(count_x, 1);
57 assert_eq!(count_y, 1);
62 let mut v = Vec::new();
63 assert_eq!(v.capacity(), 0);
66 assert!(v.capacity() >= 2);
72 assert!(v.capacity() >= 16);
74 assert!(v.capacity() >= 32);
79 assert!(v.capacity() >= 33)
84 let mut v = Vec::new();
85 let mut w = Vec::new();
104 v.extend(w.clone()); // specializes to `append`
105 assert!(v.iter().eq(w.iter().chain(w.iter())));
108 #[derive(PartialEq, Debug)]
111 let mut a = Vec::new();
112 let b = vec![Foo, Foo];
115 assert_eq!(a, &[Foo, Foo]);
120 let mut x = Vec::new();
121 let y = vec![DropCounter { count: &mut count_x }];
124 assert_eq!(count_x, 1);
128 fn test_extend_ref() {
129 let mut v = vec![1, 2];
130 v.extend(&[3, 4, 5]);
132 assert_eq!(v.len(), 5);
133 assert_eq!(v, [1, 2, 3, 4, 5]);
138 assert_eq!(v.len(), 7);
139 assert_eq!(v, [1, 2, 3, 4, 5, 6, 7]);
143 fn test_slice_from_mut() {
144 let mut values = vec![1, 2, 3, 4, 5];
146 let slice = &mut values[2..];
147 assert!(slice == [3, 4, 5]);
153 assert!(values == [1, 2, 5, 6, 7]);
157 fn test_slice_to_mut() {
158 let mut values = vec![1, 2, 3, 4, 5];
160 let slice = &mut values[..2];
161 assert!(slice == [1, 2]);
167 assert!(values == [2, 3, 3, 4, 5]);
171 fn test_split_at_mut() {
172 let mut values = vec![1, 2, 3, 4, 5];
174 let (left, right) = values.split_at_mut(2);
176 let left: &[_] = left;
177 assert!(&left[..left.len()] == &[1, 2]);
184 let right: &[_] = right;
185 assert!(&right[..right.len()] == &[3, 4, 5]);
192 assert_eq!(values, [2, 3, 5, 6, 7]);
197 let v: Vec<i32> = vec![];
198 let w = vec![1, 2, 3];
200 assert_eq!(v, v.clone());
204 // they should be disjoint in memory.
205 assert!(w.as_ptr() != z.as_ptr())
209 fn test_clone_from() {
211 let three: Vec<Box<_>> = vec![box 1, box 2, box 3];
212 let two: Vec<Box<_>> = vec![box 4, box 5];
214 v.clone_from(&three);
215 assert_eq!(v, three);
218 v.clone_from(&three);
219 assert_eq!(v, three);
226 v.clone_from(&three);
232 let mut vec = vec![1, 2, 3, 4];
233 vec.retain(|&x| x % 2 == 0);
234 assert_eq!(vec, [2, 4]);
239 fn case(a: Vec<i32>, b: Vec<i32>) {
244 case(vec![], vec![]);
245 case(vec![1], vec![1]);
246 case(vec![1, 1], vec![1]);
247 case(vec![1, 2, 3], vec![1, 2, 3]);
248 case(vec![1, 1, 2, 3], vec![1, 2, 3]);
249 case(vec![1, 2, 2, 3], vec![1, 2, 3]);
250 case(vec![1, 2, 3, 3], vec![1, 2, 3]);
251 case(vec![1, 1, 2, 2, 2, 3, 3], vec![1, 2, 3]);
255 fn test_dedup_by_key() {
256 fn case(a: Vec<i32>, b: Vec<i32>) {
258 v.dedup_by_key(|i| *i / 10);
261 case(vec![], vec![]);
262 case(vec![10], vec![10]);
263 case(vec![10, 11], vec![10]);
264 case(vec![10, 20, 30], vec![10, 20, 30]);
265 case(vec![10, 11, 20, 30], vec![10, 20, 30]);
266 case(vec![10, 20, 21, 30], vec![10, 20, 30]);
267 case(vec![10, 20, 30, 31], vec![10, 20, 30]);
268 case(vec![10, 11, 20, 21, 22, 30, 31], vec![10, 20, 30]);
273 let mut vec = vec!["foo", "bar", "Bar", "baz", "bar"];
274 vec.dedup_by(|a, b| a.eq_ignore_ascii_case(b));
276 assert_eq!(vec, ["foo", "bar", "baz", "bar"]);
278 let mut vec = vec![("foo", 1), ("foo", 2), ("bar", 3), ("bar", 4), ("bar", 5)];
279 vec.dedup_by(|a, b| a.0 == b.0 && { b.1 += a.1; true });
281 assert_eq!(vec, [("foo", 3), ("bar", 12)]);
285 fn test_dedup_unique() {
286 let mut v0: Vec<Box<_>> = vec![box 1, box 1, box 2, box 3];
288 let mut v1: Vec<Box<_>> = vec![box 1, box 2, box 2, box 3];
290 let mut v2: Vec<Box<_>> = vec![box 1, box 2, box 3, box 3];
292 // If the boxed pointers were leaked or otherwise misused, valgrind
293 // and/or rt should raise errors.
297 fn zero_sized_values() {
298 let mut v = Vec::new();
299 assert_eq!(v.len(), 0);
301 assert_eq!(v.len(), 1);
303 assert_eq!(v.len(), 2);
304 assert_eq!(v.pop(), Some(()));
305 assert_eq!(v.pop(), Some(()));
306 assert_eq!(v.pop(), None);
308 assert_eq!(v.iter().count(), 0);
310 assert_eq!(v.iter().count(), 1);
312 assert_eq!(v.iter().count(), 2);
316 assert_eq!(v.iter_mut().count(), 2);
318 assert_eq!(v.iter_mut().count(), 3);
320 assert_eq!(v.iter_mut().count(), 4);
322 for &mut () in &mut v {}
326 assert_eq!(v.iter_mut().count(), 0);
330 fn test_partition() {
331 assert_eq!(vec![].into_iter().partition(|x: &i32| *x < 3),
333 assert_eq!(vec![1, 2, 3].into_iter().partition(|x| *x < 4),
334 (vec![1, 2, 3], vec![]));
335 assert_eq!(vec![1, 2, 3].into_iter().partition(|x| *x < 2),
336 (vec![1], vec![2, 3]));
337 assert_eq!(vec![1, 2, 3].into_iter().partition(|x| *x < 0),
338 (vec![], vec![1, 2, 3]));
342 fn test_zip_unzip() {
343 let z1 = vec![(1, 4), (2, 5), (3, 6)];
345 let (left, right): (Vec<_>, Vec<_>) = z1.iter().cloned().unzip();
347 assert_eq!((1, 4), (left[0], right[0]));
348 assert_eq!((2, 5), (left[1], right[1]));
349 assert_eq!((3, 6), (left[2], right[2]));
353 fn test_vec_truncate_drop() {
354 static mut DROPS: u32 = 0;
364 let mut v = vec![Elem(1), Elem(2), Elem(3), Elem(4), Elem(5)];
365 assert_eq!(unsafe { DROPS }, 0);
367 assert_eq!(unsafe { DROPS }, 2);
369 assert_eq!(unsafe { DROPS }, 5);
374 fn test_vec_truncate_fail() {
376 impl Drop for BadElem {
378 let BadElem(ref mut x) = *self;
380 panic!("BadElem panic: 0xbadbeef")
385 let mut v = vec![BadElem(1), BadElem(2), BadElem(0xbadbeef), BadElem(4)];
391 let vec = vec![1, 2, 3];
392 assert!(vec[1] == 2);
397 fn test_index_out_of_bounds() {
398 let vec = vec![1, 2, 3];
404 fn test_slice_out_of_bounds_1() {
405 let x = vec![1, 2, 3, 4, 5];
411 fn test_slice_out_of_bounds_2() {
412 let x = vec![1, 2, 3, 4, 5];
418 fn test_slice_out_of_bounds_3() {
419 let x = vec![1, 2, 3, 4, 5];
425 fn test_slice_out_of_bounds_4() {
426 let x = vec![1, 2, 3, 4, 5];
432 fn test_slice_out_of_bounds_5() {
433 let x = vec![1, 2, 3, 4, 5];
439 fn test_swap_remove_empty() {
440 let mut vec = Vec::<i32>::new();
445 fn test_move_items() {
446 let vec = vec![1, 2, 3];
447 let mut vec2 = vec![];
451 assert_eq!(vec2, [1, 2, 3]);
455 fn test_move_items_reverse() {
456 let vec = vec![1, 2, 3];
457 let mut vec2 = vec![];
458 for i in vec.into_iter().rev() {
461 assert_eq!(vec2, [3, 2, 1]);
465 fn test_move_items_zero_sized() {
466 let vec = vec![(), (), ()];
467 let mut vec2 = vec![];
471 assert_eq!(vec2, [(), (), ()]);
475 fn test_drain_items() {
476 let mut vec = vec![1, 2, 3];
477 let mut vec2 = vec![];
478 for i in vec.drain(..) {
482 assert_eq!(vec2, [1, 2, 3]);
486 fn test_drain_items_reverse() {
487 let mut vec = vec![1, 2, 3];
488 let mut vec2 = vec![];
489 for i in vec.drain(..).rev() {
493 assert_eq!(vec2, [3, 2, 1]);
497 fn test_drain_items_zero_sized() {
498 let mut vec = vec![(), (), ()];
499 let mut vec2 = vec![];
500 for i in vec.drain(..) {
504 assert_eq!(vec2, [(), (), ()]);
509 fn test_drain_out_of_bounds() {
510 let mut v = vec![1, 2, 3, 4, 5];
515 fn test_drain_range() {
516 let mut v = vec![1, 2, 3, 4, 5];
517 for _ in v.drain(4..) {
519 assert_eq!(v, &[1, 2, 3, 4]);
521 let mut v: Vec<_> = (1..6).map(|x| x.to_string()).collect();
522 for _ in v.drain(1..4) {
524 assert_eq!(v, &[1.to_string(), 5.to_string()]);
526 let mut v: Vec<_> = (1..6).map(|x| x.to_string()).collect();
527 for _ in v.drain(1..4).rev() {
529 assert_eq!(v, &[1.to_string(), 5.to_string()]);
531 let mut v: Vec<_> = vec![(); 5];
532 for _ in v.drain(1..4).rev() {
534 assert_eq!(v, &[(), ()]);
538 fn test_drain_inclusive_range() {
539 let mut v = vec!['a', 'b', 'c', 'd', 'e'];
540 for _ in v.drain(1..=3) {
542 assert_eq!(v, &['a', 'e']);
544 let mut v: Vec<_> = (0..=5).map(|x| x.to_string()).collect();
545 for _ in v.drain(1..=5) {
547 assert_eq!(v, &["0".to_string()]);
549 let mut v: Vec<String> = (0..=5).map(|x| x.to_string()).collect();
550 for _ in v.drain(0..=5) {
552 assert_eq!(v, Vec::<String>::new());
554 let mut v: Vec<_> = (0..=5).map(|x| x.to_string()).collect();
555 for _ in v.drain(0..=3) {
557 assert_eq!(v, &["4".to_string(), "5".to_string()]);
559 let mut v: Vec<_> = (0..=1).map(|x| x.to_string()).collect();
560 for _ in v.drain(..=0) {
562 assert_eq!(v, &["1".to_string()]);
566 fn test_drain_max_vec_size() {
567 let mut v = Vec::<()>::with_capacity(usize::max_value());
568 unsafe { v.set_len(usize::max_value()); }
569 for _ in v.drain(usize::max_value() - 1..) {
571 assert_eq!(v.len(), usize::max_value() - 1);
573 let mut v = Vec::<()>::with_capacity(usize::max_value());
574 unsafe { v.set_len(usize::max_value()); }
575 for _ in v.drain(usize::max_value() - 1..=usize::max_value() - 1) {
577 assert_eq!(v.len(), usize::max_value() - 1);
582 fn test_drain_inclusive_out_of_bounds() {
583 let mut v = vec![1, 2, 3, 4, 5];
589 let mut v = vec![1, 2, 3, 4, 5];
590 let a = [10, 11, 12];
591 v.splice(2..4, a.iter().cloned());
592 assert_eq!(v, &[1, 2, 10, 11, 12, 5]);
593 v.splice(1..3, Some(20));
594 assert_eq!(v, &[1, 20, 11, 12, 5]);
598 fn test_splice_inclusive_range() {
599 let mut v = vec![1, 2, 3, 4, 5];
600 let a = [10, 11, 12];
601 let t1: Vec<_> = v.splice(2..=3, a.iter().cloned()).collect();
602 assert_eq!(v, &[1, 2, 10, 11, 12, 5]);
603 assert_eq!(t1, &[3, 4]);
604 let t2: Vec<_> = v.splice(1..=2, Some(20)).collect();
605 assert_eq!(v, &[1, 20, 11, 12, 5]);
606 assert_eq!(t2, &[2, 10]);
611 fn test_splice_out_of_bounds() {
612 let mut v = vec![1, 2, 3, 4, 5];
613 let a = [10, 11, 12];
614 v.splice(5..6, a.iter().cloned());
619 fn test_splice_inclusive_out_of_bounds() {
620 let mut v = vec![1, 2, 3, 4, 5];
621 let a = [10, 11, 12];
622 v.splice(5..=5, a.iter().cloned());
626 fn test_splice_items_zero_sized() {
627 let mut vec = vec![(), (), ()];
629 let t: Vec<_> = vec.splice(1..2, vec2.iter().cloned()).collect();
630 assert_eq!(vec, &[(), ()]);
631 assert_eq!(t, &[()]);
635 fn test_splice_unbounded() {
636 let mut vec = vec![1, 2, 3, 4, 5];
637 let t: Vec<_> = vec.splice(.., None).collect();
638 assert_eq!(vec, &[]);
639 assert_eq!(t, &[1, 2, 3, 4, 5]);
643 fn test_splice_forget() {
644 let mut v = vec![1, 2, 3, 4, 5];
645 let a = [10, 11, 12];
646 ::std::mem::forget(v.splice(2..4, a.iter().cloned()));
647 assert_eq!(v, &[1, 2]);
651 fn test_into_boxed_slice() {
652 let xs = vec![1, 2, 3];
653 let ys = xs.into_boxed_slice();
654 assert_eq!(&*ys, [1, 2, 3]);
659 let mut vec = vec![1, 2, 3];
660 let mut vec2 = vec![4, 5, 6];
661 vec.append(&mut vec2);
662 assert_eq!(vec, [1, 2, 3, 4, 5, 6]);
663 assert_eq!(vec2, []);
667 fn test_split_off() {
668 let mut vec = vec![1, 2, 3, 4, 5, 6];
669 let vec2 = vec.split_off(4);
670 assert_eq!(vec, [1, 2, 3, 4]);
671 assert_eq!(vec2, [5, 6]);
675 fn test_into_iter_as_slice() {
676 let vec = vec!['a', 'b', 'c'];
677 let mut into_iter = vec.into_iter();
678 assert_eq!(into_iter.as_slice(), &['a', 'b', 'c']);
679 let _ = into_iter.next().unwrap();
680 assert_eq!(into_iter.as_slice(), &['b', 'c']);
681 let _ = into_iter.next().unwrap();
682 let _ = into_iter.next().unwrap();
683 assert_eq!(into_iter.as_slice(), &[]);
687 fn test_into_iter_as_mut_slice() {
688 let vec = vec!['a', 'b', 'c'];
689 let mut into_iter = vec.into_iter();
690 assert_eq!(into_iter.as_slice(), &['a', 'b', 'c']);
691 into_iter.as_mut_slice()[0] = 'x';
692 into_iter.as_mut_slice()[1] = 'y';
693 assert_eq!(into_iter.next().unwrap(), 'x');
694 assert_eq!(into_iter.as_slice(), &['y', 'c']);
698 fn test_into_iter_debug() {
699 let vec = vec!['a', 'b', 'c'];
700 let into_iter = vec.into_iter();
701 let debug = format!("{:?}", into_iter);
702 assert_eq!(debug, "IntoIter(['a', 'b', 'c'])");
706 fn test_into_iter_count() {
707 assert_eq!(vec![1, 2, 3].into_iter().count(), 3);
711 fn test_into_iter_clone() {
712 fn iter_equal<I: Iterator<Item = i32>>(it: I, slice: &[i32]) {
713 let v: Vec<i32> = it.collect();
714 assert_eq!(&v[..], slice);
716 let mut it = vec![1, 2, 3].into_iter();
717 iter_equal(it.clone(), &[1, 2, 3]);
718 assert_eq!(it.next(), Some(1));
719 let mut it = it.rev();
720 iter_equal(it.clone(), &[3, 2]);
721 assert_eq!(it.next(), Some(3));
722 iter_equal(it.clone(), &[2]);
723 assert_eq!(it.next(), Some(2));
724 iter_equal(it.clone(), &[]);
725 assert_eq!(it.next(), None);
730 let borrowed: &[_] = &["borrowed", "(slice)"];
731 let owned = vec!["owned", "(vec)"];
732 match (Cow::from(owned.clone()), Cow::from(borrowed)) {
733 (Cow::Owned(o), Cow::Borrowed(b)) => assert!(o == owned && b == borrowed),
734 _ => panic!("invalid `Cow::from`"),
740 let borrowed: &[_] = &["borrowed", "(slice)"];
741 let owned = vec!["owned", "(vec)"];
742 assert_eq!(Vec::from(Cow::Borrowed(borrowed)), vec!["borrowed", "(slice)"]);
743 assert_eq!(Vec::from(Cow::Owned(owned)), vec!["owned", "(vec)"]);
747 fn assert_covariance() {
748 fn drain<'new>(d: Drain<'static, &'static str>) -> Drain<'new, &'new str> {
751 fn into_iter<'new>(i: IntoIter<&'static str>) -> IntoIter<&'new str> {
757 fn test_placement() {
758 let mut vec = vec![1];
759 assert_eq!(vec.place_back() <- 2, &2);
760 assert_eq!(vec.len(), 2);
761 assert_eq!(vec.place_back() <- 3, &3);
762 assert_eq!(vec.len(), 3);
763 assert_eq!(&vec, &[1, 2, 3]);
767 fn test_placement_panic() {
768 let mut vec = vec![1, 2, 3];
769 fn mkpanic() -> usize { panic!() }
770 let _ = panic::catch_unwind(panic::AssertUnwindSafe(|| { vec.place_back() <- mkpanic(); }));
771 assert_eq!(vec.len(), 3);
775 fn from_into_inner() {
776 let vec = vec![1, 2, 3];
777 let ptr = vec.as_ptr();
778 let vec = vec.into_iter().collect::<Vec<_>>();
779 assert_eq!(vec, [1, 2, 3]);
780 assert_eq!(vec.as_ptr(), ptr);
782 let ptr = &vec[1] as *const _;
783 let mut it = vec.into_iter();
785 let vec = it.collect::<Vec<_>>();
786 assert_eq!(vec, [2, 3]);
787 assert!(ptr != vec.as_ptr());
791 fn overaligned_allocations() {
794 let mut v = vec![Foo(273)];
797 assert!(v[0].0 == 273);
798 assert!(v.as_ptr() as usize & 0xff == 0);
800 assert!(v[0].0 == 273);
801 assert!(v.as_ptr() as usize & 0xff == 0);
806 fn drain_filter_empty() {
807 let mut vec: Vec<i32> = vec![];
810 let mut iter = vec.drain_filter(|_| true);
811 assert_eq!(iter.size_hint(), (0, Some(0)));
812 assert_eq!(iter.next(), None);
813 assert_eq!(iter.size_hint(), (0, Some(0)));
814 assert_eq!(iter.next(), None);
815 assert_eq!(iter.size_hint(), (0, Some(0)));
817 assert_eq!(vec.len(), 0);
818 assert_eq!(vec, vec![]);
822 fn drain_filter_zst() {
823 let mut vec = vec![(), (), (), (), ()];
824 let initial_len = vec.len();
827 let mut iter = vec.drain_filter(|_| true);
828 assert_eq!(iter.size_hint(), (0, Some(initial_len)));
829 while let Some(_) = iter.next() {
831 assert_eq!(iter.size_hint(), (0, Some(initial_len - count)));
833 assert_eq!(iter.size_hint(), (0, Some(0)));
834 assert_eq!(iter.next(), None);
835 assert_eq!(iter.size_hint(), (0, Some(0)));
838 assert_eq!(count, initial_len);
839 assert_eq!(vec.len(), 0);
840 assert_eq!(vec, vec![]);
844 fn drain_filter_false() {
845 let mut vec = vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
847 let initial_len = vec.len();
850 let mut iter = vec.drain_filter(|_| false);
851 assert_eq!(iter.size_hint(), (0, Some(initial_len)));
852 for _ in iter.by_ref() {
855 assert_eq!(iter.size_hint(), (0, Some(0)));
856 assert_eq!(iter.next(), None);
857 assert_eq!(iter.size_hint(), (0, Some(0)));
860 assert_eq!(count, 0);
861 assert_eq!(vec.len(), initial_len);
862 assert_eq!(vec, vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);
866 fn drain_filter_true() {
867 let mut vec = vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
869 let initial_len = vec.len();
872 let mut iter = vec.drain_filter(|_| true);
873 assert_eq!(iter.size_hint(), (0, Some(initial_len)));
874 while let Some(_) = iter.next() {
876 assert_eq!(iter.size_hint(), (0, Some(initial_len - count)));
878 assert_eq!(iter.size_hint(), (0, Some(0)));
879 assert_eq!(iter.next(), None);
880 assert_eq!(iter.size_hint(), (0, Some(0)));
883 assert_eq!(count, initial_len);
884 assert_eq!(vec.len(), 0);
885 assert_eq!(vec, vec![]);
889 fn drain_filter_complex() {
891 { // [+xxx++++++xxxxx++++x+x++]
892 let mut vec = vec![1,
894 7, 9, 11, 13, 15, 17,
902 let removed = vec.drain_filter(|x| *x % 2 == 0).collect::<Vec<_>>();
903 assert_eq!(removed.len(), 10);
904 assert_eq!(removed, vec![2, 4, 6, 18, 20, 22, 24, 26, 34, 36]);
906 assert_eq!(vec.len(), 14);
907 assert_eq!(vec, vec![1, 7, 9, 11, 13, 15, 17, 27, 29, 31, 33, 35, 37, 39]);
910 { // [xxx++++++xxxxx++++x+x++]
911 let mut vec = vec![2, 4, 6,
912 7, 9, 11, 13, 15, 17,
920 let removed = vec.drain_filter(|x| *x % 2 == 0).collect::<Vec<_>>();
921 assert_eq!(removed.len(), 10);
922 assert_eq!(removed, vec![2, 4, 6, 18, 20, 22, 24, 26, 34, 36]);
924 assert_eq!(vec.len(), 13);
925 assert_eq!(vec, vec![7, 9, 11, 13, 15, 17, 27, 29, 31, 33, 35, 37, 39]);
928 { // [xxx++++++xxxxx++++x+x]
929 let mut vec = vec![2, 4, 6,
930 7, 9, 11, 13, 15, 17,
937 let removed = vec.drain_filter(|x| *x % 2 == 0).collect::<Vec<_>>();
938 assert_eq!(removed.len(), 10);
939 assert_eq!(removed, vec![2, 4, 6, 18, 20, 22, 24, 26, 34, 36]);
941 assert_eq!(vec.len(), 11);
942 assert_eq!(vec, vec![7, 9, 11, 13, 15, 17, 27, 29, 31, 33, 35]);
945 { // [xxxxxxxxxx+++++++++++]
946 let mut vec = vec![2, 4, 6, 8, 10, 12, 14, 16, 18, 20,
947 1, 3, 5, 7, 9, 11, 13, 15, 17, 19];
949 let removed = vec.drain_filter(|x| *x % 2 == 0).collect::<Vec<_>>();
950 assert_eq!(removed.len(), 10);
951 assert_eq!(removed, vec![2, 4, 6, 8, 10, 12, 14, 16, 18, 20]);
953 assert_eq!(vec.len(), 10);
954 assert_eq!(vec, vec![1, 3, 5, 7, 9, 11, 13, 15, 17, 19]);
957 { // [+++++++++++xxxxxxxxxx]
958 let mut vec = vec![1, 3, 5, 7, 9, 11, 13, 15, 17, 19,
959 2, 4, 6, 8, 10, 12, 14, 16, 18, 20];
961 let removed = vec.drain_filter(|x| *x % 2 == 0).collect::<Vec<_>>();
962 assert_eq!(removed.len(), 10);
963 assert_eq!(removed, vec![2, 4, 6, 8, 10, 12, 14, 16, 18, 20]);
965 assert_eq!(vec.len(), 10);
966 assert_eq!(vec, vec![1, 3, 5, 7, 9, 11, 13, 15, 17, 19]);