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rust/library/alloc/tests/vec.rs

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use core::alloc::{Allocator, Layout};
use core::assert_eq;
use core::iter::IntoIterator;
use core::num::NonZeroUsize;
use core::ptr::NonNull;
use std::alloc::System;
use std::assert_matches::assert_matches;
use std::borrow::Cow;
use std::cell::Cell;
use std::collections::TryReserveErrorKind::*;
use std::fmt::Debug;
use std::hint;
use std::iter::InPlaceIterable;
use std::mem;
use std::mem::{size_of, swap};
use std::ops::Bound::*;
use std::panic::{catch_unwind, AssertUnwindSafe};
use std::rc::Rc;
use std::sync::atomic::{AtomicU32, Ordering};
use std::vec::{Drain, IntoIter};
struct DropCounter<'a> {
count: &'a mut u32,
}
impl Drop for DropCounter<'_> {
fn drop(&mut self) {
*self.count += 1;
}
}
#[test]
fn test_small_vec_struct() {
assert_eq!(size_of::<Vec<u8>>(), size_of::<usize>() * 3);
}
#[test]
fn test_double_drop() {
struct TwoVec<T> {
x: Vec<T>,
y: Vec<T>,
}
let (mut count_x, mut count_y) = (0, 0);
{
let mut tv = TwoVec { x: Vec::new(), y: Vec::new() };
tv.x.push(DropCounter { count: &mut count_x });
tv.y.push(DropCounter { count: &mut count_y });
// If Vec had a drop flag, here is where it would be zeroed.
// Instead, it should rely on its internal state to prevent
// doing anything significant when dropped multiple times.
drop(tv.x);
// Here tv goes out of scope, tv.y should be dropped, but not tv.x.
}
assert_eq!(count_x, 1);
assert_eq!(count_y, 1);
}
#[test]
fn test_reserve() {
let mut v = Vec::new();
assert_eq!(v.capacity(), 0);
v.reserve(2);
assert!(v.capacity() >= 2);
for i in 0..16 {
v.push(i);
}
assert!(v.capacity() >= 16);
v.reserve(16);
assert!(v.capacity() >= 32);
v.push(16);
v.reserve(16);
assert!(v.capacity() >= 33)
}
#[test]
fn test_zst_capacity() {
assert_eq!(Vec::<()>::new().capacity(), usize::MAX);
}
#[test]
fn test_indexing() {
let v: Vec<isize> = vec![10, 20];
assert_eq!(v[0], 10);
assert_eq!(v[1], 20);
let mut x: usize = 0;
assert_eq!(v[x], 10);
assert_eq!(v[x + 1], 20);
x = x + 1;
assert_eq!(v[x], 20);
assert_eq!(v[x - 1], 10);
}
#[test]
fn test_debug_fmt() {
let vec1: Vec<isize> = vec![];
assert_eq!("[]", format!("{:?}", vec1));
let vec2 = vec![0, 1];
assert_eq!("[0, 1]", format!("{:?}", vec2));
let slice: &[isize] = &[4, 5];
assert_eq!("[4, 5]", format!("{slice:?}"));
}
#[test]
fn test_push() {
let mut v = vec![];
v.push(1);
assert_eq!(v, [1]);
v.push(2);
assert_eq!(v, [1, 2]);
v.push(3);
assert_eq!(v, [1, 2, 3]);
}
#[test]
fn test_extend() {
let mut v = Vec::new();
let mut w = Vec::new();
v.extend(w.clone());
assert_eq!(v, &[]);
v.extend(0..3);
for i in 0..3 {
w.push(i)
}
assert_eq!(v, w);
v.extend(3..10);
for i in 3..10 {
w.push(i)
}
assert_eq!(v, w);
v.extend(w.clone()); // specializes to `append`
assert!(v.iter().eq(w.iter().chain(w.iter())));
// Zero sized types
#[derive(PartialEq, Debug)]
struct Foo;
let mut a = Vec::new();
let b = vec![Foo, Foo];
a.extend(b);
assert_eq!(a, &[Foo, Foo]);
// Double drop
let mut count_x = 0;
{
let mut x = Vec::new();
let y = vec![DropCounter { count: &mut count_x }];
x.extend(y);
}
assert_eq!(count_x, 1);
}
#[test]
fn test_extend_from_slice() {
let a: Vec<isize> = vec![1, 2, 3, 4, 5];
let b: Vec<isize> = vec![6, 7, 8, 9, 0];
let mut v: Vec<isize> = a;
v.extend_from_slice(&b);
assert_eq!(v, [1, 2, 3, 4, 5, 6, 7, 8, 9, 0]);
}
#[test]
fn test_extend_ref() {
let mut v = vec![1, 2];
v.extend(&[3, 4, 5]);
assert_eq!(v.len(), 5);
assert_eq!(v, [1, 2, 3, 4, 5]);
let w = vec![6, 7];
v.extend(&w);
assert_eq!(v.len(), 7);
assert_eq!(v, [1, 2, 3, 4, 5, 6, 7]);
}
#[test]
fn test_slice_from_ref() {
let values = vec![1, 2, 3, 4, 5];
let slice = &values[1..3];
assert_eq!(slice, [2, 3]);
}
#[test]
fn test_slice_from_mut() {
let mut values = vec![1, 2, 3, 4, 5];
{
let slice = &mut values[2..];
assert!(slice == [3, 4, 5]);
for p in slice {
*p += 2;
}
}
assert!(values == [1, 2, 5, 6, 7]);
}
#[test]
fn test_slice_to_mut() {
let mut values = vec![1, 2, 3, 4, 5];
{
let slice = &mut values[..2];
assert!(slice == [1, 2]);
for p in slice {
*p += 1;
}
}
assert!(values == [2, 3, 3, 4, 5]);
}
#[test]
fn test_split_at_mut() {
let mut values = vec![1, 2, 3, 4, 5];
{
let (left, right) = values.split_at_mut(2);
{
let left: &[_] = left;
assert!(&left[..left.len()] == &[1, 2]);
}
for p in left {
*p += 1;
}
{
let right: &[_] = right;
assert!(&right[..right.len()] == &[3, 4, 5]);
}
for p in right {
*p += 2;
}
}
assert_eq!(values, [2, 3, 5, 6, 7]);
}
#[test]
fn test_clone() {
let v: Vec<i32> = vec![];
let w = vec![1, 2, 3];
assert_eq!(v, v.clone());
let z = w.clone();
assert_eq!(w, z);
// they should be disjoint in memory.
assert!(w.as_ptr() != z.as_ptr())
}
#[test]
fn test_clone_from() {
let mut v = vec![];
let three: Vec<Box<_>> = vec![Box::new(1), Box::new(2), Box::new(3)];
let two: Vec<Box<_>> = vec![Box::new(4), Box::new(5)];
// zero, long
v.clone_from(&three);
assert_eq!(v, three);
// equal
v.clone_from(&three);
assert_eq!(v, three);
// long, short
v.clone_from(&two);
assert_eq!(v, two);
// short, long
v.clone_from(&three);
assert_eq!(v, three)
}
#[test]
fn test_retain() {
let mut vec = vec![1, 2, 3, 4];
vec.retain(|&x| x % 2 == 0);
assert_eq!(vec, [2, 4]);
}
#[test]
fn test_retain_predicate_order() {
for to_keep in [true, false] {
let mut number_of_executions = 0;
let mut vec = vec![1, 2, 3, 4];
let mut next_expected = 1;
vec.retain(|&x| {
assert_eq!(next_expected, x);
next_expected += 1;
number_of_executions += 1;
to_keep
});
assert_eq!(number_of_executions, 4);
}
}
#[test]
#[cfg_attr(not(panic = "unwind"), ignore = "test requires unwinding support")]
fn test_retain_pred_panic_with_hole() {
let v = (0..5).map(Rc::new).collect::<Vec<_>>();
catch_unwind(AssertUnwindSafe(|| {
let mut v = v.clone();
v.retain(|r| match **r {
0 => true,
1 => false,
2 => true,
_ => panic!(),
});
}))
.unwrap_err();
// Everything is dropped when predicate panicked.
assert!(v.iter().all(|r| Rc::strong_count(r) == 1));
}
#[test]
#[cfg_attr(not(panic = "unwind"), ignore = "test requires unwinding support")]
fn test_retain_pred_panic_no_hole() {
let v = (0..5).map(Rc::new).collect::<Vec<_>>();
catch_unwind(AssertUnwindSafe(|| {
let mut v = v.clone();
v.retain(|r| match **r {
0 | 1 | 2 => true,
_ => panic!(),
});
}))
.unwrap_err();
// Everything is dropped when predicate panicked.
assert!(v.iter().all(|r| Rc::strong_count(r) == 1));
}
#[test]
#[cfg_attr(not(panic = "unwind"), ignore = "test requires unwinding support")]
fn test_retain_drop_panic() {
struct Wrap(Rc<i32>);
impl Drop for Wrap {
fn drop(&mut self) {
if *self.0 == 3 {
panic!();
}
}
}
let v = (0..5).map(|x| Rc::new(x)).collect::<Vec<_>>();
catch_unwind(AssertUnwindSafe(|| {
let mut v = v.iter().map(|r| Wrap(r.clone())).collect::<Vec<_>>();
v.retain(|w| match *w.0 {
0 => true,
1 => false,
2 => true,
3 => false, // Drop panic.
_ => true,
});
}))
.unwrap_err();
// Other elements are dropped when `drop` of one element panicked.
// The panicked wrapper also has its Rc dropped.
assert!(v.iter().all(|r| Rc::strong_count(r) == 1));
}
#[test]
fn test_retain_maybeuninits() {
// This test aimed to be run under miri.
use core::mem::MaybeUninit;
let mut vec: Vec<_> = [1i32, 2, 3, 4].map(|v| MaybeUninit::new(vec![v])).into();
vec.retain(|x| {
// SAFETY: Retain must visit every element of Vec in original order and exactly once.
// Our values is initialized at creation of Vec.
let v = unsafe { x.assume_init_ref()[0] };
if v & 1 == 0 {
return true;
}
// SAFETY: Value is initialized.
// Value wouldn't be dropped by `Vec::retain`
// because `MaybeUninit` doesn't drop content.
drop(unsafe { x.assume_init_read() });
false
});
let vec: Vec<i32> = vec
.into_iter()
.map(|x| unsafe {
// SAFETY: All values dropped in retain predicate must be removed by `Vec::retain`.
// Remaining values are initialized.
x.assume_init()[0]
})
.collect();
assert_eq!(vec, [2, 4]);
}
#[test]
fn test_dedup() {
fn case(a: Vec<i32>, b: Vec<i32>) {
let mut v = a;
v.dedup();
assert_eq!(v, b);
}
case(vec![], vec![]);
case(vec![1], vec![1]);
case(vec![1, 1], vec![1]);
case(vec![1, 2, 3], vec![1, 2, 3]);
case(vec![1, 1, 2, 3], vec![1, 2, 3]);
case(vec![1, 2, 2, 3], vec![1, 2, 3]);
case(vec![1, 2, 3, 3], vec![1, 2, 3]);
case(vec![1, 1, 2, 2, 2, 3, 3], vec![1, 2, 3]);
}
#[test]
fn test_dedup_by_key() {
fn case(a: Vec<i32>, b: Vec<i32>) {
let mut v = a;
v.dedup_by_key(|i| *i / 10);
assert_eq!(v, b);
}
case(vec![], vec![]);
case(vec![10], vec![10]);
case(vec![10, 11], vec![10]);
case(vec![10, 20, 30], vec![10, 20, 30]);
case(vec![10, 11, 20, 30], vec![10, 20, 30]);
case(vec![10, 20, 21, 30], vec![10, 20, 30]);
case(vec![10, 20, 30, 31], vec![10, 20, 30]);
case(vec![10, 11, 20, 21, 22, 30, 31], vec![10, 20, 30]);
}
#[test]
fn test_dedup_by() {
let mut vec = vec!["foo", "bar", "Bar", "baz", "bar"];
vec.dedup_by(|a, b| a.eq_ignore_ascii_case(b));
assert_eq!(vec, ["foo", "bar", "baz", "bar"]);
let mut vec = vec![("foo", 1), ("foo", 2), ("bar", 3), ("bar", 4), ("bar", 5)];
vec.dedup_by(|a, b| {
a.0 == b.0 && {
b.1 += a.1;
true
}
});
assert_eq!(vec, [("foo", 3), ("bar", 12)]);
}
#[test]
fn test_dedup_unique() {
let mut v0: Vec<Box<_>> = vec![Box::new(1), Box::new(1), Box::new(2), Box::new(3)];
v0.dedup();
let mut v1: Vec<Box<_>> = vec![Box::new(1), Box::new(2), Box::new(2), Box::new(3)];
v1.dedup();
let mut v2: Vec<Box<_>> = vec![Box::new(1), Box::new(2), Box::new(3), Box::new(3)];
v2.dedup();
// If the boxed pointers were leaked or otherwise misused, valgrind
// and/or rt should raise errors.
}
#[test]
fn zero_sized_values() {
let mut v = Vec::new();
assert_eq!(v.len(), 0);
v.push(());
assert_eq!(v.len(), 1);
v.push(());
assert_eq!(v.len(), 2);
assert_eq!(v.pop(), Some(()));
assert_eq!(v.pop(), Some(()));
assert_eq!(v.pop(), None);
assert_eq!(v.iter().count(), 0);
v.push(());
assert_eq!(v.iter().count(), 1);
v.push(());
assert_eq!(v.iter().count(), 2);
for &() in &v {}
assert_eq!(v.iter_mut().count(), 2);
v.push(());
assert_eq!(v.iter_mut().count(), 3);
v.push(());
assert_eq!(v.iter_mut().count(), 4);
for &mut () in &mut v {}
unsafe {
v.set_len(0);
}
assert_eq!(v.iter_mut().count(), 0);
}
#[test]
fn test_partition() {
assert_eq!([].into_iter().partition(|x: &i32| *x < 3), (vec![], vec![]));
assert_eq!([1, 2, 3].into_iter().partition(|x| *x < 4), (vec![1, 2, 3], vec![]));
assert_eq!([1, 2, 3].into_iter().partition(|x| *x < 2), (vec![1], vec![2, 3]));
assert_eq!([1, 2, 3].into_iter().partition(|x| *x < 0), (vec![], vec![1, 2, 3]));
}
#[test]
fn test_zip_unzip() {
let z1 = vec![(1, 4), (2, 5), (3, 6)];
let (left, right): (Vec<_>, Vec<_>) = z1.iter().cloned().unzip();
assert_eq!((1, 4), (left[0], right[0]));
assert_eq!((2, 5), (left[1], right[1]));
assert_eq!((3, 6), (left[2], right[2]));
}
#[test]
fn test_cmp() {
let x: &[isize] = &[1, 2, 3, 4, 5];
let cmp: &[isize] = &[1, 2, 3, 4, 5];
assert_eq!(&x[..], cmp);
let cmp: &[isize] = &[3, 4, 5];
assert_eq!(&x[2..], cmp);
let cmp: &[isize] = &[1, 2, 3];
assert_eq!(&x[..3], cmp);
let cmp: &[isize] = &[2, 3, 4];
assert_eq!(&x[1..4], cmp);
let x: Vec<isize> = vec![1, 2, 3, 4, 5];
let cmp: &[isize] = &[1, 2, 3, 4, 5];
assert_eq!(&x[..], cmp);
let cmp: &[isize] = &[3, 4, 5];
assert_eq!(&x[2..], cmp);
let cmp: &[isize] = &[1, 2, 3];
assert_eq!(&x[..3], cmp);
let cmp: &[isize] = &[2, 3, 4];
assert_eq!(&x[1..4], cmp);
}
#[test]
fn test_vec_truncate_drop() {
static mut DROPS: u32 = 0;
struct Elem(i32);
impl Drop for Elem {
fn drop(&mut self) {
unsafe {
DROPS += 1;
}
}
}
let mut v = vec![Elem(1), Elem(2), Elem(3), Elem(4), Elem(5)];
assert_eq!(unsafe { DROPS }, 0);
v.truncate(3);
assert_eq!(unsafe { DROPS }, 2);
v.truncate(0);
assert_eq!(unsafe { DROPS }, 5);
}
#[test]
#[should_panic]
fn test_vec_truncate_fail() {
struct BadElem(i32);
impl Drop for BadElem {
fn drop(&mut self) {
let BadElem(ref mut x) = *self;
if *x == 0xbadbeef {
panic!("BadElem panic: 0xbadbeef")
}
}
}
let mut v = vec![BadElem(1), BadElem(2), BadElem(0xbadbeef), BadElem(4)];
v.truncate(0);
}
#[test]
fn test_index() {
let vec = vec![1, 2, 3];
assert!(vec[1] == 2);
}
#[test]
#[should_panic]
fn test_index_out_of_bounds() {
let vec = vec![1, 2, 3];
let _ = vec[3];
}
#[test]
#[should_panic]
fn test_slice_out_of_bounds_1() {
let x = vec![1, 2, 3, 4, 5];
let _ = &x[!0..];
}
#[test]
#[should_panic]
fn test_slice_out_of_bounds_2() {
let x = vec![1, 2, 3, 4, 5];
let _ = &x[..6];
}
#[test]
#[should_panic]
fn test_slice_out_of_bounds_3() {
let x = vec![1, 2, 3, 4, 5];
let _ = &x[!0..4];
}
#[test]
#[should_panic]
fn test_slice_out_of_bounds_4() {
let x = vec![1, 2, 3, 4, 5];
let _ = &x[1..6];
}
#[test]
#[should_panic]
fn test_slice_out_of_bounds_5() {
let x = vec![1, 2, 3, 4, 5];
let _ = &x[3..2];
}
#[test]
#[should_panic]
fn test_swap_remove_empty() {
let mut vec = Vec::<i32>::new();
vec.swap_remove(0);
}
#[test]
fn test_move_items() {
let vec = vec![1, 2, 3];
let mut vec2 = vec![];
for i in vec {
vec2.push(i);
}
assert_eq!(vec2, [1, 2, 3]);
}
#[test]
fn test_move_items_reverse() {
let vec = vec![1, 2, 3];
let mut vec2 = vec![];
for i in vec.into_iter().rev() {
vec2.push(i);
}
assert_eq!(vec2, [3, 2, 1]);
}
#[test]
fn test_move_items_zero_sized() {
let vec = vec![(), (), ()];
let mut vec2 = vec![];
for i in vec {
vec2.push(i);
}
assert_eq!(vec2, [(), (), ()]);
}
#[test]
fn test_drain_empty_vec() {
let mut vec: Vec<i32> = vec![];
let mut vec2: Vec<i32> = vec![];
for i in vec.drain(..) {
vec2.push(i);
}
assert!(vec.is_empty());
assert!(vec2.is_empty());
}
#[test]
fn test_drain_items() {
let mut vec = vec![1, 2, 3];
let mut vec2 = vec![];
for i in vec.drain(..) {
vec2.push(i);
}
assert_eq!(vec, []);
assert_eq!(vec2, [1, 2, 3]);
}
#[test]
fn test_drain_items_reverse() {
let mut vec = vec![1, 2, 3];
let mut vec2 = vec![];
for i in vec.drain(..).rev() {
vec2.push(i);
}
assert_eq!(vec, []);
assert_eq!(vec2, [3, 2, 1]);
}
#[test]
fn test_drain_items_zero_sized() {
let mut vec = vec![(), (), ()];
let mut vec2 = vec![];
for i in vec.drain(..) {
vec2.push(i);
}
assert_eq!(vec, []);
assert_eq!(vec2, [(), (), ()]);
}
#[test]
#[should_panic]
fn test_drain_out_of_bounds() {
let mut v = vec![1, 2, 3, 4, 5];
v.drain(5..6);
}
#[test]
fn test_drain_range() {
let mut v = vec![1, 2, 3, 4, 5];
for _ in v.drain(4..) {}
assert_eq!(v, &[1, 2, 3, 4]);
let mut v: Vec<_> = (1..6).map(|x| x.to_string()).collect();
for _ in v.drain(1..4) {}
assert_eq!(v, &[1.to_string(), 5.to_string()]);
let mut v: Vec<_> = (1..6).map(|x| x.to_string()).collect();
for _ in v.drain(1..4).rev() {}
assert_eq!(v, &[1.to_string(), 5.to_string()]);
let mut v: Vec<_> = vec![(); 5];
for _ in v.drain(1..4).rev() {}
assert_eq!(v, &[(), ()]);
}
#[test]
fn test_drain_inclusive_range() {
let mut v = vec!['a', 'b', 'c', 'd', 'e'];
for _ in v.drain(1..=3) {}
assert_eq!(v, &['a', 'e']);
let mut v: Vec<_> = (0..=5).map(|x| x.to_string()).collect();
for _ in v.drain(1..=5) {}
assert_eq!(v, &["0".to_string()]);
let mut v: Vec<String> = (0..=5).map(|x| x.to_string()).collect();
for _ in v.drain(0..=5) {}
assert_eq!(v, Vec::<String>::new());
let mut v: Vec<_> = (0..=5).map(|x| x.to_string()).collect();
for _ in v.drain(0..=3) {}
assert_eq!(v, &["4".to_string(), "5".to_string()]);
let mut v: Vec<_> = (0..=1).map(|x| x.to_string()).collect();
for _ in v.drain(..=0) {}
assert_eq!(v, &["1".to_string()]);
}
#[test]
fn test_drain_max_vec_size() {
let mut v = Vec::<()>::with_capacity(usize::MAX);
unsafe {
v.set_len(usize::MAX);
}
for _ in v.drain(usize::MAX - 1..) {}
assert_eq!(v.len(), usize::MAX - 1);
let mut v = Vec::<()>::with_capacity(usize::MAX);
unsafe {
v.set_len(usize::MAX);
}
for _ in v.drain(usize::MAX - 1..=usize::MAX - 1) {}
assert_eq!(v.len(), usize::MAX - 1);
}
#[test]
#[should_panic]
fn test_drain_index_overflow() {
let mut v = Vec::<()>::with_capacity(usize::MAX);
unsafe {
v.set_len(usize::MAX);
}
v.drain(0..=usize::MAX);
}
#[test]
#[should_panic]
fn test_drain_inclusive_out_of_bounds() {
let mut v = vec![1, 2, 3, 4, 5];
v.drain(5..=5);
}
#[test]
#[should_panic]
fn test_drain_start_overflow() {
let mut v = vec![1, 2, 3];
v.drain((Excluded(usize::MAX), Included(0)));
}
#[test]
#[should_panic]
fn test_drain_end_overflow() {
let mut v = vec![1, 2, 3];
v.drain((Included(0), Included(usize::MAX)));
}
#[test]
#[cfg_attr(not(panic = "unwind"), ignore = "test requires unwinding support")]
fn test_drain_leak() {
static mut DROPS: i32 = 0;
#[derive(Debug, PartialEq)]
struct D(u32, bool);
impl Drop for D {
fn drop(&mut self) {
unsafe {
DROPS += 1;
}
if self.1 {
panic!("panic in `drop`");
}
}
}
let mut v = vec![
D(0, false),
D(1, false),
D(2, false),
D(3, false),
D(4, true),
D(5, false),
D(6, false),
];
catch_unwind(AssertUnwindSafe(|| {
v.drain(2..=5);
}))
.ok();
assert_eq!(unsafe { DROPS }, 4);
assert_eq!(v, vec![D(0, false), D(1, false), D(6, false),]);
}
#[test]
fn test_drain_keep_rest() {
let mut v = vec![0, 1, 2, 3, 4, 5, 6];
let mut drain = v.drain(1..6);
assert_eq!(drain.next(), Some(1));
assert_eq!(drain.next_back(), Some(5));
assert_eq!(drain.next(), Some(2));
drain.keep_rest();
assert_eq!(v, &[0, 3, 4, 6]);
}
#[test]
fn test_drain_keep_rest_all() {
let mut v = vec![0, 1, 2, 3, 4, 5, 6];
v.drain(1..6).keep_rest();
assert_eq!(v, &[0, 1, 2, 3, 4, 5, 6]);
}
#[test]
fn test_drain_keep_rest_none() {
let mut v = vec![0, 1, 2, 3, 4, 5, 6];
let mut drain = v.drain(1..6);
drain.by_ref().for_each(drop);
drain.keep_rest();
assert_eq!(v, &[0, 6]);
}
#[test]
fn test_splice() {
let mut v = vec![1, 2, 3, 4, 5];
let a = [10, 11, 12];
v.splice(2..4, a);
assert_eq!(v, &[1, 2, 10, 11, 12, 5]);
v.splice(1..3, Some(20));
assert_eq!(v, &[1, 20, 11, 12, 5]);
}
#[test]
fn test_splice_inclusive_range() {
let mut v = vec![1, 2, 3, 4, 5];
let a = [10, 11, 12];
let t1: Vec<_> = v.splice(2..=3, a).collect();
assert_eq!(v, &[1, 2, 10, 11, 12, 5]);
assert_eq!(t1, &[3, 4]);
let t2: Vec<_> = v.splice(1..=2, Some(20)).collect();
assert_eq!(v, &[1, 20, 11, 12, 5]);
assert_eq!(t2, &[2, 10]);
}
#[test]
#[should_panic]
fn test_splice_out_of_bounds() {
let mut v = vec![1, 2, 3, 4, 5];
let a = [10, 11, 12];
v.splice(5..6, a);
}
#[test]
#[should_panic]
fn test_splice_inclusive_out_of_bounds() {
let mut v = vec![1, 2, 3, 4, 5];
let a = [10, 11, 12];
v.splice(5..=5, a);
}
#[test]
fn test_splice_items_zero_sized() {
let mut vec = vec![(), (), ()];
let vec2 = vec![];
let t: Vec<_> = vec.splice(1..2, vec2.iter().cloned()).collect();
assert_eq!(vec, &[(), ()]);
assert_eq!(t, &[()]);
}
#[test]
fn test_splice_unbounded() {
let mut vec = vec![1, 2, 3, 4, 5];
let t: Vec<_> = vec.splice(.., None).collect();
assert_eq!(vec, &[]);
assert_eq!(t, &[1, 2, 3, 4, 5]);
}
#[test]
fn test_splice_forget() {
let mut v = vec![1, 2, 3, 4, 5];
let a = [10, 11, 12];
std::mem::forget(v.splice(2..4, a));
assert_eq!(v, &[1, 2]);
}
#[test]
fn test_into_boxed_slice() {
let xs = vec![1, 2, 3];
let ys = xs.into_boxed_slice();
assert_eq!(&*ys, [1, 2, 3]);
}
#[test]
fn test_append() {
let mut vec = vec![1, 2, 3];
let mut vec2 = vec![4, 5, 6];
vec.append(&mut vec2);
assert_eq!(vec, [1, 2, 3, 4, 5, 6]);
assert_eq!(vec2, []);
}
#[test]
fn test_split_off() {
let mut vec = vec![1, 2, 3, 4, 5, 6];
let orig_capacity = vec.capacity();
let vec2 = vec.split_off(4);
assert_eq!(vec, [1, 2, 3, 4]);
assert_eq!(vec2, [5, 6]);
assert_eq!(vec.capacity(), orig_capacity);
}
#[test]
fn test_split_off_take_all() {
let mut vec = vec![1, 2, 3, 4, 5, 6];
let orig_ptr = vec.as_ptr();
let orig_capacity = vec.capacity();
let vec2 = vec.split_off(0);
assert_eq!(vec, []);
assert_eq!(vec2, [1, 2, 3, 4, 5, 6]);
assert_eq!(vec.capacity(), orig_capacity);
assert_eq!(vec2.as_ptr(), orig_ptr);
}
#[test]
fn test_into_iter_as_slice() {
let vec = vec!['a', 'b', 'c'];
let mut into_iter = vec.into_iter();
assert_eq!(into_iter.as_slice(), &['a', 'b', 'c']);
let _ = into_iter.next().unwrap();
assert_eq!(into_iter.as_slice(), &['b', 'c']);
let _ = into_iter.next().unwrap();
let _ = into_iter.next().unwrap();
assert_eq!(into_iter.as_slice(), &[]);
}
#[test]
fn test_into_iter_as_mut_slice() {
let vec = vec!['a', 'b', 'c'];
let mut into_iter = vec.into_iter();
assert_eq!(into_iter.as_slice(), &['a', 'b', 'c']);
into_iter.as_mut_slice()[0] = 'x';
into_iter.as_mut_slice()[1] = 'y';
assert_eq!(into_iter.next().unwrap(), 'x');
assert_eq!(into_iter.as_slice(), &['y', 'c']);
}
#[test]
fn test_into_iter_debug() {
let vec = vec!['a', 'b', 'c'];
let into_iter = vec.into_iter();
let debug = format!("{into_iter:?}");
assert_eq!(debug, "IntoIter(['a', 'b', 'c'])");
}
#[test]
fn test_into_iter_count() {
assert_eq!([1, 2, 3].into_iter().count(), 3);
}
#[test]
fn test_into_iter_next_chunk() {
let mut iter = b"lorem".to_vec().into_iter();
assert_eq!(iter.next_chunk().unwrap(), [b'l', b'o']); // N is inferred as 2
assert_eq!(iter.next_chunk().unwrap(), [b'r', b'e', b'm']); // N is inferred as 3
assert_eq!(iter.next_chunk::<4>().unwrap_err().as_slice(), &[]); // N is explicitly 4
}
#[test]
fn test_into_iter_clone() {
fn iter_equal<I: Iterator<Item = i32>>(it: I, slice: &[i32]) {
let v: Vec<i32> = it.collect();
assert_eq!(&v[..], slice);
}
let mut it = [1, 2, 3].into_iter();
iter_equal(it.clone(), &[1, 2, 3]);
assert_eq!(it.next(), Some(1));
let mut it = it.rev();
iter_equal(it.clone(), &[3, 2]);
assert_eq!(it.next(), Some(3));
iter_equal(it.clone(), &[2]);
assert_eq!(it.next(), Some(2));
iter_equal(it.clone(), &[]);
assert_eq!(it.next(), None);
}
#[test]
#[cfg_attr(not(panic = "unwind"), ignore = "test requires unwinding support")]
fn test_into_iter_leak() {
static mut DROPS: i32 = 0;
struct D(bool);
impl Drop for D {
fn drop(&mut self) {
unsafe {
DROPS += 1;
}
if self.0 {
panic!("panic in `drop`");
}
}
}
let v = vec![D(false), D(true), D(false)];
catch_unwind(move || drop(v.into_iter())).ok();
assert_eq!(unsafe { DROPS }, 3);
}
#[test]
fn test_into_iter_advance_by() {
let mut i = vec![1, 2, 3, 4, 5].into_iter();
assert_eq!(i.advance_by(0), Ok(()));
assert_eq!(i.advance_back_by(0), Ok(()));
assert_eq!(i.as_slice(), [1, 2, 3, 4, 5]);
assert_eq!(i.advance_by(1), Ok(()));
assert_eq!(i.advance_back_by(1), Ok(()));
assert_eq!(i.as_slice(), [2, 3, 4]);
assert_eq!(i.advance_back_by(usize::MAX), Err(NonZeroUsize::new(usize::MAX - 3).unwrap()));
assert_eq!(i.advance_by(usize::MAX), Err(NonZeroUsize::new(usize::MAX).unwrap()));
assert_eq!(i.advance_by(0), Ok(()));
assert_eq!(i.advance_back_by(0), Ok(()));
assert_eq!(i.len(), 0);
}
#[test]
fn test_into_iter_drop_allocator() {
struct ReferenceCountedAllocator<'a>(DropCounter<'a>);
unsafe impl Allocator for ReferenceCountedAllocator<'_> {
fn allocate(&self, layout: Layout) -> Result<NonNull<[u8]>, core::alloc::AllocError> {
System.allocate(layout)
}
unsafe fn deallocate(&self, ptr: NonNull<u8>, layout: Layout) {
// Safety: Invariants passed to caller.
unsafe { System.deallocate(ptr, layout) }
}
}
let mut drop_count = 0;
let allocator = ReferenceCountedAllocator(DropCounter { count: &mut drop_count });
let _ = Vec::<u32, _>::new_in(allocator);
assert_eq!(drop_count, 1);
let allocator = ReferenceCountedAllocator(DropCounter { count: &mut drop_count });
let _ = Vec::<u32, _>::new_in(allocator).into_iter();
assert_eq!(drop_count, 2);
}
#[test]
fn test_into_iter_zst() {
#[derive(Debug, Clone)]
struct AlignedZstWithDrop([u64; 0]);
impl Drop for AlignedZstWithDrop {
fn drop(&mut self) {
let addr = self as *mut _ as usize;
assert!(hint::black_box(addr) % mem::align_of::<u64>() == 0);
}
}
const C: AlignedZstWithDrop = AlignedZstWithDrop([0u64; 0]);
for _ in vec![C].into_iter() {}
for _ in vec![C; 5].into_iter().rev() {}
let mut it = vec![C, C].into_iter();
assert_eq!(it.advance_by(1), Ok(()));
drop(it);
let mut it = vec![C, C].into_iter();
it.next_chunk::<1>().unwrap();
drop(it);
let mut it = vec![C, C].into_iter();
it.next_chunk::<4>().unwrap_err();
drop(it);
}
#[test]
fn test_from_iter_specialization() {
let src: Vec<usize> = vec![0usize; 1];
let srcptr = src.as_ptr();
let sink = src.into_iter().collect::<Vec<_>>();
let sinkptr = sink.as_ptr();
assert_eq!(srcptr, sinkptr);
}
#[test]
fn test_from_iter_partially_drained_in_place_specialization() {
let src: Vec<usize> = vec![0usize; 10];
let srcptr = src.as_ptr();
let mut iter = src.into_iter();
iter.next();
iter.next();
let sink = iter.collect::<Vec<_>>();
let sinkptr = sink.as_ptr();
assert_eq!(srcptr, sinkptr);
}
#[test]
fn test_from_iter_specialization_with_iterator_adapters() {
fn assert_in_place_trait<T: InPlaceIterable>(_: &T) {}
let src: Vec<usize> = vec![0usize; 256];
let srcptr = src.as_ptr();
let iter = src
.into_iter()
.enumerate()
.map(|i| i.0 + i.1)
.zip(std::iter::repeat(1usize))
.map(|(a, b)| a + b)
.map_while(Option::Some)
.skip(1)
.map(|e| if e != usize::MAX { Ok(std::num::NonZeroUsize::new(e)) } else { Err(()) });
assert_in_place_trait(&iter);
let sink = iter.collect::<Result<Vec<_>, _>>().unwrap();
let sinkptr = sink.as_ptr();
assert_eq!(srcptr, sinkptr as *const usize);
}
#[test]
fn test_from_iter_specialization_head_tail_drop() {
let drop_count: Vec<_> = (0..=2).map(|_| Rc::new(())).collect();
let src: Vec<_> = drop_count.iter().cloned().collect();
let srcptr = src.as_ptr();
let iter = src.into_iter();
let sink: Vec<_> = iter.skip(1).take(1).collect();
let sinkptr = sink.as_ptr();
assert_eq!(srcptr, sinkptr, "specialization was applied");
assert_eq!(Rc::strong_count(&drop_count[0]), 1, "front was dropped");
assert_eq!(Rc::strong_count(&drop_count[1]), 2, "one element was collected");
assert_eq!(Rc::strong_count(&drop_count[2]), 1, "tail was dropped");
assert_eq!(sink.len(), 1);
}
#[test]
#[cfg_attr(not(panic = "unwind"), ignore = "test requires unwinding support")]
fn test_from_iter_specialization_panic_during_iteration_drops() {
let drop_count: Vec<_> = (0..=2).map(|_| Rc::new(())).collect();
let src: Vec<_> = drop_count.iter().cloned().collect();
let iter = src.into_iter();
let _ = std::panic::catch_unwind(AssertUnwindSafe(|| {
let _ = iter
.enumerate()
.filter_map(|(i, e)| {
if i == 1 {
std::panic!("aborting iteration");
}
Some(e)
})
.collect::<Vec<_>>();
}));
assert!(
drop_count.iter().map(Rc::strong_count).all(|count| count == 1),
"all items were dropped once"
);
}
#[test]
#[cfg_attr(not(panic = "unwind"), ignore = "test requires unwinding support")]
fn test_from_iter_specialization_panic_during_drop_doesnt_leak() {
static mut DROP_COUNTER_OLD: [usize; 5] = [0; 5];
static mut DROP_COUNTER_NEW: [usize; 2] = [0; 2];
#[derive(Debug)]
struct Old(usize);
impl Drop for Old {
fn drop(&mut self) {
unsafe {
DROP_COUNTER_OLD[self.0] += 1;
}
if self.0 == 3 {
panic!();
}
println!("Dropped Old: {}", self.0);
}
}
#[derive(Debug)]
struct New(usize);
impl Drop for New {
fn drop(&mut self) {
unsafe {
DROP_COUNTER_NEW[self.0] += 1;
}
println!("Dropped New: {}", self.0);
}
}
let _ = std::panic::catch_unwind(AssertUnwindSafe(|| {
let v = vec![Old(0), Old(1), Old(2), Old(3), Old(4)];
let _ = v.into_iter().map(|x| New(x.0)).take(2).collect::<Vec<_>>();
}));
assert_eq!(unsafe { DROP_COUNTER_OLD[0] }, 1);
assert_eq!(unsafe { DROP_COUNTER_OLD[1] }, 1);
assert_eq!(unsafe { DROP_COUNTER_OLD[2] }, 1);
assert_eq!(unsafe { DROP_COUNTER_OLD[3] }, 1);
assert_eq!(unsafe { DROP_COUNTER_OLD[4] }, 1);
assert_eq!(unsafe { DROP_COUNTER_NEW[0] }, 1);
assert_eq!(unsafe { DROP_COUNTER_NEW[1] }, 1);
}
// regression test for issue #85322. Peekable previously implemented InPlaceIterable,
// but due to an interaction with IntoIter's current Clone implementation it failed to uphold
// the contract.
#[test]
fn test_collect_after_iterator_clone() {
let v = vec![0; 5];
let mut i = v.into_iter().map(|i| i + 1).peekable();
i.peek();
let v = i.clone().collect::<Vec<_>>();
assert_eq!(v, [1, 1, 1, 1, 1]);
assert!(v.len() <= v.capacity());
}
#[test]
fn test_cow_from() {
let borrowed: &[_] = &["borrowed", "(slice)"];
let owned = vec!["owned", "(vec)"];
match (Cow::from(owned.clone()), Cow::from(borrowed)) {
(Cow::Owned(o), Cow::Borrowed(b)) => assert!(o == owned && b == borrowed),
_ => panic!("invalid `Cow::from`"),
}
}
#[test]
fn test_from_cow() {
let borrowed: &[_] = &["borrowed", "(slice)"];
let owned = vec!["owned", "(vec)"];
assert_eq!(Vec::from(Cow::Borrowed(borrowed)), vec!["borrowed", "(slice)"]);
assert_eq!(Vec::from(Cow::Owned(owned)), vec!["owned", "(vec)"]);
}
#[allow(dead_code)]
fn assert_covariance() {
fn drain<'new>(d: Drain<'static, &'static str>) -> Drain<'new, &'new str> {
d
}
fn into_iter<'new>(i: IntoIter<&'static str>) -> IntoIter<&'new str> {
i
}
}
#[test]
fn from_into_inner() {
let vec = vec![1, 2, 3];
let ptr = vec.as_ptr();
let vec = vec.into_iter().collect::<Vec<_>>();
assert_eq!(vec, [1, 2, 3]);
assert_eq!(vec.as_ptr(), ptr);
let ptr = &vec[1] as *const _;
let mut it = vec.into_iter();
it.next().unwrap();
let vec = it.collect::<Vec<_>>();
assert_eq!(vec, [2, 3]);
assert!(ptr != vec.as_ptr());
}
#[test]
fn overaligned_allocations() {
#[repr(align(256))]
struct Foo(usize);
let mut v = vec![Foo(273)];
for i in 0..0x1000 {
v.reserve_exact(i);
assert!(v[0].0 == 273);
assert!(v.as_ptr() as usize & 0xff == 0);
v.shrink_to_fit();
assert!(v[0].0 == 273);
assert!(v.as_ptr() as usize & 0xff == 0);
}
}
#[test]
fn extract_if_empty() {
let mut vec: Vec<i32> = vec![];
{
let mut iter = vec.extract_if(|_| true);
assert_eq!(iter.size_hint(), (0, Some(0)));
assert_eq!(iter.next(), None);
assert_eq!(iter.size_hint(), (0, Some(0)));
assert_eq!(iter.next(), None);
assert_eq!(iter.size_hint(), (0, Some(0)));
}
assert_eq!(vec.len(), 0);
assert_eq!(vec, vec![]);
}
#[test]
fn extract_if_zst() {
let mut vec = vec![(), (), (), (), ()];
let initial_len = vec.len();
let mut count = 0;
{
let mut iter = vec.extract_if(|_| true);
assert_eq!(iter.size_hint(), (0, Some(initial_len)));
while let Some(_) = iter.next() {
count += 1;
assert_eq!(iter.size_hint(), (0, Some(initial_len - count)));
}
assert_eq!(iter.size_hint(), (0, Some(0)));
assert_eq!(iter.next(), None);
assert_eq!(iter.size_hint(), (0, Some(0)));
}
assert_eq!(count, initial_len);
assert_eq!(vec.len(), 0);
assert_eq!(vec, vec![]);
}
#[test]
fn extract_if_false() {
let mut vec = vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
let initial_len = vec.len();
let mut count = 0;
{
let mut iter = vec.extract_if(|_| false);
assert_eq!(iter.size_hint(), (0, Some(initial_len)));
for _ in iter.by_ref() {
count += 1;
}
assert_eq!(iter.size_hint(), (0, Some(0)));
assert_eq!(iter.next(), None);
assert_eq!(iter.size_hint(), (0, Some(0)));
}
assert_eq!(count, 0);
assert_eq!(vec.len(), initial_len);
assert_eq!(vec, vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);
}
#[test]
fn extract_if_true() {
let mut vec = vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
let initial_len = vec.len();
let mut count = 0;
{
let mut iter = vec.extract_if(|_| true);
assert_eq!(iter.size_hint(), (0, Some(initial_len)));
while let Some(_) = iter.next() {
count += 1;
assert_eq!(iter.size_hint(), (0, Some(initial_len - count)));
}
assert_eq!(iter.size_hint(), (0, Some(0)));
assert_eq!(iter.next(), None);
assert_eq!(iter.size_hint(), (0, Some(0)));
}
assert_eq!(count, initial_len);
assert_eq!(vec.len(), 0);
assert_eq!(vec, vec![]);
}
#[test]
fn extract_if_complex() {
{
// [+xxx++++++xxxxx++++x+x++]
let mut vec = vec![
1, 2, 4, 6, 7, 9, 11, 13, 15, 17, 18, 20, 22, 24, 26, 27, 29, 31, 33, 34, 35, 36, 37,
39,
];
let removed = vec.extract_if(|x| *x % 2 == 0).collect::<Vec<_>>();
assert_eq!(removed.len(), 10);
assert_eq!(removed, vec![2, 4, 6, 18, 20, 22, 24, 26, 34, 36]);
assert_eq!(vec.len(), 14);
assert_eq!(vec, vec![1, 7, 9, 11, 13, 15, 17, 27, 29, 31, 33, 35, 37, 39]);
}
{
// [xxx++++++xxxxx++++x+x++]
let mut vec = vec![
2, 4, 6, 7, 9, 11, 13, 15, 17, 18, 20, 22, 24, 26, 27, 29, 31, 33, 34, 35, 36, 37, 39,
];
let removed = vec.extract_if(|x| *x % 2 == 0).collect::<Vec<_>>();
assert_eq!(removed.len(), 10);
assert_eq!(removed, vec![2, 4, 6, 18, 20, 22, 24, 26, 34, 36]);
assert_eq!(vec.len(), 13);
assert_eq!(vec, vec![7, 9, 11, 13, 15, 17, 27, 29, 31, 33, 35, 37, 39]);
}
{
// [xxx++++++xxxxx++++x+x]
let mut vec =
vec![2, 4, 6, 7, 9, 11, 13, 15, 17, 18, 20, 22, 24, 26, 27, 29, 31, 33, 34, 35, 36];
let removed = vec.extract_if(|x| *x % 2 == 0).collect::<Vec<_>>();
assert_eq!(removed.len(), 10);
assert_eq!(removed, vec![2, 4, 6, 18, 20, 22, 24, 26, 34, 36]);
assert_eq!(vec.len(), 11);
assert_eq!(vec, vec![7, 9, 11, 13, 15, 17, 27, 29, 31, 33, 35]);
}
{
// [xxxxxxxxxx+++++++++++]
let mut vec = vec![2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 1, 3, 5, 7, 9, 11, 13, 15, 17, 19];
let removed = vec.extract_if(|x| *x % 2 == 0).collect::<Vec<_>>();
assert_eq!(removed.len(), 10);
assert_eq!(removed, vec![2, 4, 6, 8, 10, 12, 14, 16, 18, 20]);
assert_eq!(vec.len(), 10);
assert_eq!(vec, vec![1, 3, 5, 7, 9, 11, 13, 15, 17, 19]);
}
{
// [+++++++++++xxxxxxxxxx]
let mut vec = vec![1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20];
let removed = vec.extract_if(|x| *x % 2 == 0).collect::<Vec<_>>();
assert_eq!(removed.len(), 10);
assert_eq!(removed, vec![2, 4, 6, 8, 10, 12, 14, 16, 18, 20]);
assert_eq!(vec.len(), 10);
assert_eq!(vec, vec![1, 3, 5, 7, 9, 11, 13, 15, 17, 19]);
}
}
// FIXME: re-enable emscripten once it can unwind again
#[test]
#[cfg(not(target_os = "emscripten"))]
#[cfg_attr(not(panic = "unwind"), ignore = "test requires unwinding support")]
fn extract_if_consumed_panic() {
use std::rc::Rc;
use std::sync::Mutex;
struct Check {
index: usize,
drop_counts: Rc<Mutex<Vec<usize>>>,
}
impl Drop for Check {
fn drop(&mut self) {
self.drop_counts.lock().unwrap()[self.index] += 1;
println!("drop: {}", self.index);
}
}
let check_count = 10;
let drop_counts = Rc::new(Mutex::new(vec![0_usize; check_count]));
let mut data: Vec<Check> = (0..check_count)
.map(|index| Check { index, drop_counts: Rc::clone(&drop_counts) })
.collect();
let _ = std::panic::catch_unwind(move || {
let filter = |c: &mut Check| {
if c.index == 2 {
panic!("panic at index: {}", c.index);
}
// Verify that if the filter could panic again on another element
// that it would not cause a double panic and all elements of the
// vec would still be dropped exactly once.
if c.index == 4 {
panic!("panic at index: {}", c.index);
}
c.index < 6
};
let drain = data.extract_if(filter);
// NOTE: The ExtractIf is explicitly consumed
drain.for_each(drop);
});
let drop_counts = drop_counts.lock().unwrap();
assert_eq!(check_count, drop_counts.len());
for (index, count) in drop_counts.iter().cloned().enumerate() {
assert_eq!(1, count, "unexpected drop count at index: {} (count: {})", index, count);
}
}
// FIXME: Re-enable emscripten once it can catch panics
#[test]
#[cfg(not(target_os = "emscripten"))]
#[cfg_attr(not(panic = "unwind"), ignore = "test requires unwinding support")]
fn extract_if_unconsumed_panic() {
use std::rc::Rc;
use std::sync::Mutex;
struct Check {
index: usize,
drop_counts: Rc<Mutex<Vec<usize>>>,
}
impl Drop for Check {
fn drop(&mut self) {
self.drop_counts.lock().unwrap()[self.index] += 1;
println!("drop: {}", self.index);
}
}
let check_count = 10;
let drop_counts = Rc::new(Mutex::new(vec![0_usize; check_count]));
let mut data: Vec<Check> = (0..check_count)
.map(|index| Check { index, drop_counts: Rc::clone(&drop_counts) })
.collect();
let _ = std::panic::catch_unwind(move || {
let filter = |c: &mut Check| {
if c.index == 2 {
panic!("panic at index: {}", c.index);
}
// Verify that if the filter could panic again on another element
// that it would not cause a double panic and all elements of the
// vec would still be dropped exactly once.
if c.index == 4 {
panic!("panic at index: {}", c.index);
}
c.index < 6
};
let _drain = data.extract_if(filter);
// NOTE: The ExtractIf is dropped without being consumed
});
let drop_counts = drop_counts.lock().unwrap();
assert_eq!(check_count, drop_counts.len());
for (index, count) in drop_counts.iter().cloned().enumerate() {
assert_eq!(1, count, "unexpected drop count at index: {} (count: {})", index, count);
}
}
#[test]
fn extract_if_unconsumed() {
let mut vec = vec![1, 2, 3, 4];
let drain = vec.extract_if(|&mut x| x % 2 != 0);
drop(drain);
assert_eq!(vec, [1, 2, 3, 4]);
}
#[test]
fn test_reserve_exact() {
// This is all the same as test_reserve
let mut v = Vec::new();
assert_eq!(v.capacity(), 0);
v.reserve_exact(2);
assert!(v.capacity() >= 2);
for i in 0..16 {
v.push(i);
}
assert!(v.capacity() >= 16);
v.reserve_exact(16);
assert!(v.capacity() >= 32);
v.push(16);
v.reserve_exact(16);
assert!(v.capacity() >= 33)
}
#[test]
#[cfg_attr(miri, ignore)] // Miri does not support signalling OOM
#[cfg_attr(target_os = "android", ignore)] // Android used in CI has a broken dlmalloc
fn test_try_reserve() {
// These are the interesting cases:
// * exactly isize::MAX should never trigger a CapacityOverflow (can be OOM)
// * > isize::MAX should always fail
// * On 16/32-bit should CapacityOverflow
// * On 64-bit should OOM
// * overflow may trigger when adding `len` to `cap` (in number of elements)
// * overflow may trigger when multiplying `new_cap` by size_of::<T> (to get bytes)
const MAX_CAP: usize = isize::MAX as usize;
const MAX_USIZE: usize = usize::MAX;
{
// Note: basic stuff is checked by test_reserve
let mut empty_bytes: Vec<u8> = Vec::new();
// Check isize::MAX doesn't count as an overflow
if let Err(CapacityOverflow) = empty_bytes.try_reserve(MAX_CAP).map_err(|e| e.kind()) {
panic!("isize::MAX shouldn't trigger an overflow!");
}
// Play it again, frank! (just to be sure)
if let Err(CapacityOverflow) = empty_bytes.try_reserve(MAX_CAP).map_err(|e| e.kind()) {
panic!("isize::MAX shouldn't trigger an overflow!");
}
// Check isize::MAX + 1 does count as overflow
assert_matches!(
empty_bytes.try_reserve(MAX_CAP + 1).map_err(|e| e.kind()),
Err(CapacityOverflow),
"isize::MAX + 1 should trigger an overflow!"
);
// Check usize::MAX does count as overflow
assert_matches!(
empty_bytes.try_reserve(MAX_USIZE).map_err(|e| e.kind()),
Err(CapacityOverflow),
"usize::MAX should trigger an overflow!"
);
}
{
// Same basic idea, but with non-zero len
let mut ten_bytes: Vec<u8> = vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
if let Err(CapacityOverflow) = ten_bytes.try_reserve(MAX_CAP - 10).map_err(|e| e.kind()) {
panic!("isize::MAX shouldn't trigger an overflow!");
}
if let Err(CapacityOverflow) = ten_bytes.try_reserve(MAX_CAP - 10).map_err(|e| e.kind()) {
panic!("isize::MAX shouldn't trigger an overflow!");
}
assert_matches!(
ten_bytes.try_reserve(MAX_CAP - 9).map_err(|e| e.kind()),
Err(CapacityOverflow),
"isize::MAX + 1 should trigger an overflow!"
);
// Should always overflow in the add-to-len
assert_matches!(
ten_bytes.try_reserve(MAX_USIZE).map_err(|e| e.kind()),
Err(CapacityOverflow),
"usize::MAX should trigger an overflow!"
);
}
{
// Same basic idea, but with interesting type size
let mut ten_u32s: Vec<u32> = vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
if let Err(CapacityOverflow) = ten_u32s.try_reserve(MAX_CAP / 4 - 10).map_err(|e| e.kind())
{
panic!("isize::MAX shouldn't trigger an overflow!");
}
if let Err(CapacityOverflow) = ten_u32s.try_reserve(MAX_CAP / 4 - 10).map_err(|e| e.kind())
{
panic!("isize::MAX shouldn't trigger an overflow!");
}
assert_matches!(
ten_u32s.try_reserve(MAX_CAP / 4 - 9).map_err(|e| e.kind()),
Err(CapacityOverflow),
"isize::MAX + 1 should trigger an overflow!"
);
// Should fail in the mul-by-size
assert_matches!(
ten_u32s.try_reserve(MAX_USIZE - 20).map_err(|e| e.kind()),
Err(CapacityOverflow),
"usize::MAX should trigger an overflow!"
);
}
}
#[test]
#[cfg_attr(miri, ignore)] // Miri does not support signalling OOM
#[cfg_attr(target_os = "android", ignore)] // Android used in CI has a broken dlmalloc
fn test_try_reserve_exact() {
// This is exactly the same as test_try_reserve with the method changed.
// See that test for comments.
const MAX_CAP: usize = isize::MAX as usize;
const MAX_USIZE: usize = usize::MAX;
{
let mut empty_bytes: Vec<u8> = Vec::new();
if let Err(CapacityOverflow) = empty_bytes.try_reserve_exact(MAX_CAP).map_err(|e| e.kind())
{
panic!("isize::MAX shouldn't trigger an overflow!");
}
if let Err(CapacityOverflow) = empty_bytes.try_reserve_exact(MAX_CAP).map_err(|e| e.kind())
{
panic!("isize::MAX shouldn't trigger an overflow!");
}
assert_matches!(
empty_bytes.try_reserve_exact(MAX_CAP + 1).map_err(|e| e.kind()),
Err(CapacityOverflow),
"isize::MAX + 1 should trigger an overflow!"
);
assert_matches!(
empty_bytes.try_reserve_exact(MAX_USIZE).map_err(|e| e.kind()),
Err(CapacityOverflow),
"usize::MAX should trigger an overflow!"
);
}
{
let mut ten_bytes: Vec<u8> = vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
if let Err(CapacityOverflow) =
ten_bytes.try_reserve_exact(MAX_CAP - 10).map_err(|e| e.kind())
{
panic!("isize::MAX shouldn't trigger an overflow!");
}
if let Err(CapacityOverflow) =
ten_bytes.try_reserve_exact(MAX_CAP - 10).map_err(|e| e.kind())
{
panic!("isize::MAX shouldn't trigger an overflow!");
}
assert_matches!(
ten_bytes.try_reserve_exact(MAX_CAP - 9).map_err(|e| e.kind()),
Err(CapacityOverflow),
"isize::MAX + 1 should trigger an overflow!"
);
assert_matches!(
ten_bytes.try_reserve_exact(MAX_USIZE).map_err(|e| e.kind()),
Err(CapacityOverflow),
"usize::MAX should trigger an overflow!"
);
}
{
let mut ten_u32s: Vec<u32> = vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
if let Err(CapacityOverflow) =
ten_u32s.try_reserve_exact(MAX_CAP / 4 - 10).map_err(|e| e.kind())
{
panic!("isize::MAX shouldn't trigger an overflow!");
}
if let Err(CapacityOverflow) =
ten_u32s.try_reserve_exact(MAX_CAP / 4 - 10).map_err(|e| e.kind())
{
panic!("isize::MAX shouldn't trigger an overflow!");
}
assert_matches!(
ten_u32s.try_reserve_exact(MAX_CAP / 4 - 9).map_err(|e| e.kind()),
Err(CapacityOverflow),
"isize::MAX + 1 should trigger an overflow!"
);
assert_matches!(
ten_u32s.try_reserve_exact(MAX_USIZE - 20).map_err(|e| e.kind()),
Err(CapacityOverflow),
"usize::MAX should trigger an overflow!"
);
}
}
#[test]
fn test_stable_pointers() {
/// Pull an element from the iterator, then drop it.
/// Useful to cover both the `next` and `drop` paths of an iterator.
fn next_then_drop<I: Iterator>(mut i: I) {
i.next().unwrap();
drop(i);
}
// Test that, if we reserved enough space, adding and removing elements does not
// invalidate references into the vector (such as `v0`). This test also
// runs in Miri, which would detect such problems.
// Note that this test does *not* constitute a stable guarantee that all these functions do not
// reallocate! Only what is explicitly documented at
// <https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#guarantees> is stably guaranteed.
let mut v = Vec::with_capacity(128);
v.push(13);
// Laundering the lifetime -- we take care that `v` does not reallocate, so that's okay.
let v0 = &mut v[0];
let v0 = unsafe { &mut *(v0 as *mut _) };
// Now do a bunch of things and occasionally use `v0` again to assert it is still valid.
// Pushing/inserting and popping/removing
v.push(1);
v.push(2);
v.insert(1, 1);
assert_eq!(*v0, 13);
v.remove(1);
v.pop().unwrap();
assert_eq!(*v0, 13);
v.push(1);
v.swap_remove(1);
assert_eq!(v.len(), 2);
v.swap_remove(1); // swap_remove the last element
assert_eq!(*v0, 13);
// Appending
v.append(&mut vec![27, 19]);
assert_eq!(*v0, 13);
// Extending
v.extend_from_slice(&[1, 2]);
v.extend(&[1, 2]); // `slice::Iter` (with `T: Copy`) specialization
v.extend(vec![2, 3]); // `vec::IntoIter` specialization
v.extend(std::iter::once(3)); // `TrustedLen` specialization
v.extend(std::iter::empty::<i32>()); // `TrustedLen` specialization with empty iterator
v.extend(std::iter::once(3).filter(|_| true)); // base case
v.extend(std::iter::once(&3)); // `cloned` specialization
assert_eq!(*v0, 13);
// Truncation
v.truncate(2);
assert_eq!(*v0, 13);
// Resizing
v.resize_with(v.len() + 10, || 42);
assert_eq!(*v0, 13);
v.resize_with(2, || panic!());
assert_eq!(*v0, 13);
// No-op reservation
v.reserve(32);
v.reserve_exact(32);
assert_eq!(*v0, 13);
// Partial draining
v.resize_with(10, || 42);
next_then_drop(v.drain(5..));
assert_eq!(*v0, 13);
// Splicing
v.resize_with(10, || 42);
next_then_drop(v.splice(5.., vec![1, 2, 3, 4, 5])); // empty tail after range
assert_eq!(*v0, 13);
next_then_drop(v.splice(5..8, vec![1])); // replacement is smaller than original range
assert_eq!(*v0, 13);
next_then_drop(v.splice(5..6, [1; 10].into_iter().filter(|_| true))); // lower bound not exact
assert_eq!(*v0, 13);
// spare_capacity_mut
v.spare_capacity_mut();
assert_eq!(*v0, 13);
// Smoke test that would fire even outside Miri if an actual relocation happened.
// Also ensures the pointer is still writeable after all this.
*v0 -= 13;
assert_eq!(v[0], 0);
}
// https://github.com/rust-lang/rust/pull/49496 introduced specialization based on:
//
// ```
// unsafe impl<T: ?Sized> IsZero for *mut T {
// fn is_zero(&self) -> bool {
// (*self).is_null()
// }
// }
// ```
//
// … to call `RawVec::with_capacity_zeroed` for creating `Vec<*mut T>`,
// which is incorrect for fat pointers since `<*mut T>::is_null` only looks at the data component.
// That is, a fat pointer can be “null” without being made entirely of zero bits.
#[test]
fn vec_macro_repeating_null_raw_fat_pointer() {
let raw_dyn = &mut (|| ()) as &mut dyn Fn() as *mut dyn Fn();
let vtable = dbg!(ptr_metadata(raw_dyn));
let null_raw_dyn = ptr_from_raw_parts(std::ptr::null_mut(), vtable);
assert!(null_raw_dyn.is_null());
let vec = vec![null_raw_dyn; 1];
dbg!(ptr_metadata(vec[0]));
assert!(vec[0] == null_raw_dyn);
// Polyfill for https://github.com/rust-lang/rfcs/pull/2580
fn ptr_metadata(ptr: *mut dyn Fn()) -> *mut () {
unsafe { std::mem::transmute::<*mut dyn Fn(), DynRepr>(ptr).vtable }
}
fn ptr_from_raw_parts(data: *mut (), vtable: *mut ()) -> *mut dyn Fn() {
unsafe { std::mem::transmute::<DynRepr, *mut dyn Fn()>(DynRepr { data, vtable }) }
}
#[repr(C)]
struct DynRepr {
data: *mut (),
vtable: *mut (),
}
}
// This test will likely fail if you change the capacities used in
// `RawVec::grow_amortized`.
#[test]
fn test_push_growth_strategy() {
// If the element size is 1, we jump from 0 to 8, then double.
{
let mut v1: Vec<u8> = vec![];
assert_eq!(v1.capacity(), 0);
for _ in 0..8 {
v1.push(0);
assert_eq!(v1.capacity(), 8);
}
for _ in 8..16 {
v1.push(0);
assert_eq!(v1.capacity(), 16);
}
for _ in 16..32 {
v1.push(0);
assert_eq!(v1.capacity(), 32);
}
for _ in 32..64 {
v1.push(0);
assert_eq!(v1.capacity(), 64);
}
}
// If the element size is 2..=1024, we jump from 0 to 4, then double.
{
let mut v2: Vec<u16> = vec![];
let mut v1024: Vec<[u8; 1024]> = vec![];
assert_eq!(v2.capacity(), 0);
assert_eq!(v1024.capacity(), 0);
for _ in 0..4 {
v2.push(0);
v1024.push([0; 1024]);
assert_eq!(v2.capacity(), 4);
assert_eq!(v1024.capacity(), 4);
}
for _ in 4..8 {
v2.push(0);
v1024.push([0; 1024]);
assert_eq!(v2.capacity(), 8);
assert_eq!(v1024.capacity(), 8);
}
for _ in 8..16 {
v2.push(0);
v1024.push([0; 1024]);
assert_eq!(v2.capacity(), 16);
assert_eq!(v1024.capacity(), 16);
}
for _ in 16..32 {
v2.push(0);
v1024.push([0; 1024]);
assert_eq!(v2.capacity(), 32);
assert_eq!(v1024.capacity(), 32);
}
for _ in 32..64 {
v2.push(0);
v1024.push([0; 1024]);
assert_eq!(v2.capacity(), 64);
assert_eq!(v1024.capacity(), 64);
}
}
// If the element size is > 1024, we jump from 0 to 1, then double.
{
let mut v1025: Vec<[u8; 1025]> = vec![];
assert_eq!(v1025.capacity(), 0);
for _ in 0..1 {
v1025.push([0; 1025]);
assert_eq!(v1025.capacity(), 1);
}
for _ in 1..2 {
v1025.push([0; 1025]);
assert_eq!(v1025.capacity(), 2);
}
for _ in 2..4 {
v1025.push([0; 1025]);
assert_eq!(v1025.capacity(), 4);
}
for _ in 4..8 {
v1025.push([0; 1025]);
assert_eq!(v1025.capacity(), 8);
}
for _ in 8..16 {
v1025.push([0; 1025]);
assert_eq!(v1025.capacity(), 16);
}
for _ in 16..32 {
v1025.push([0; 1025]);
assert_eq!(v1025.capacity(), 32);
}
for _ in 32..64 {
v1025.push([0; 1025]);
assert_eq!(v1025.capacity(), 64);
}
}
}
macro_rules! generate_assert_eq_vec_and_prim {
($name:ident<$B:ident>($type:ty)) => {
fn $name<A: PartialEq<$B> + Debug, $B: Debug>(a: Vec<A>, b: $type) {
assert!(a == b);
assert_eq!(a, b);
}
};
}
generate_assert_eq_vec_and_prim! { assert_eq_vec_and_slice <B>(&[B]) }
generate_assert_eq_vec_and_prim! { assert_eq_vec_and_array_3<B>([B; 3]) }
#[test]
fn partialeq_vec_and_prim() {
assert_eq_vec_and_slice(vec![1, 2, 3], &[1, 2, 3]);
assert_eq_vec_and_array_3(vec![1, 2, 3], [1, 2, 3]);
}
macro_rules! assert_partial_eq_valid {
($a2:expr, $a3:expr; $b2:expr, $b3: expr) => {
assert!($a2 == $b2);
assert!($a2 != $b3);
assert!($a3 != $b2);
assert!($a3 == $b3);
assert_eq!($a2, $b2);
assert_ne!($a2, $b3);
assert_ne!($a3, $b2);
assert_eq!($a3, $b3);
};
}
#[test]
fn partialeq_vec_full() {
let vec2: Vec<_> = vec![1, 2];
let vec3: Vec<_> = vec![1, 2, 3];
let slice2: &[_] = &[1, 2];
let slice3: &[_] = &[1, 2, 3];
let slicemut2: &[_] = &mut [1, 2];
let slicemut3: &[_] = &mut [1, 2, 3];
let array2: [_; 2] = [1, 2];
let array3: [_; 3] = [1, 2, 3];
let arrayref2: &[_; 2] = &[1, 2];
let arrayref3: &[_; 3] = &[1, 2, 3];
assert_partial_eq_valid!(vec2,vec3; vec2,vec3);
assert_partial_eq_valid!(vec2,vec3; slice2,slice3);
assert_partial_eq_valid!(vec2,vec3; slicemut2,slicemut3);
assert_partial_eq_valid!(slice2,slice3; vec2,vec3);
assert_partial_eq_valid!(slicemut2,slicemut3; vec2,vec3);
assert_partial_eq_valid!(vec2,vec3; array2,array3);
assert_partial_eq_valid!(vec2,vec3; arrayref2,arrayref3);
assert_partial_eq_valid!(vec2,vec3; arrayref2[..],arrayref3[..]);
}
#[test]
fn test_vec_cycle() {
#[derive(Debug)]
struct C<'a> {
v: Vec<Cell<Option<&'a C<'a>>>>,
}
impl<'a> C<'a> {
fn new() -> C<'a> {
C { v: Vec::new() }
}
}
let mut c1 = C::new();
let mut c2 = C::new();
let mut c3 = C::new();
// Push
c1.v.push(Cell::new(None));
c1.v.push(Cell::new(None));
c2.v.push(Cell::new(None));
c2.v.push(Cell::new(None));
c3.v.push(Cell::new(None));
c3.v.push(Cell::new(None));
// Set
c1.v[0].set(Some(&c2));
c1.v[1].set(Some(&c3));
c2.v[0].set(Some(&c2));
c2.v[1].set(Some(&c3));
c3.v[0].set(Some(&c1));
c3.v[1].set(Some(&c2));
}
#[test]
fn test_vec_cycle_wrapped() {
struct Refs<'a> {
v: Vec<Cell<Option<&'a C<'a>>>>,
}
struct C<'a> {
refs: Refs<'a>,
}
impl<'a> Refs<'a> {
fn new() -> Refs<'a> {
Refs { v: Vec::new() }
}
}
impl<'a> C<'a> {
fn new() -> C<'a> {
C { refs: Refs::new() }
}
}
let mut c1 = C::new();
let mut c2 = C::new();
let mut c3 = C::new();
c1.refs.v.push(Cell::new(None));
c1.refs.v.push(Cell::new(None));
c2.refs.v.push(Cell::new(None));
c2.refs.v.push(Cell::new(None));
c3.refs.v.push(Cell::new(None));
c3.refs.v.push(Cell::new(None));
c1.refs.v[0].set(Some(&c2));
c1.refs.v[1].set(Some(&c3));
c2.refs.v[0].set(Some(&c2));
c2.refs.v[1].set(Some(&c3));
c3.refs.v[0].set(Some(&c1));
c3.refs.v[1].set(Some(&c2));
}
#[test]
fn test_zero_sized_capacity() {
for len in [0, 1, 2, 4, 8, 16, 32, 64, 128, 256] {
let v = Vec::<()>::with_capacity(len);
assert_eq!(v.len(), 0);
assert_eq!(v.capacity(), usize::MAX);
}
}
#[test]
fn test_zero_sized_vec_push() {
const N: usize = 8;
for len in 0..N {
let mut tester = Vec::with_capacity(len);
assert_eq!(tester.len(), 0);
assert!(tester.capacity() >= len);
for _ in 0..len {
tester.push(());
}
assert_eq!(tester.len(), len);
assert_eq!(tester.iter().count(), len);
tester.clear();
}
}
#[test]
fn test_vec_macro_repeat() {
assert_eq!(vec![1; 3], vec![1, 1, 1]);
assert_eq!(vec![1; 2], vec![1, 1]);
assert_eq!(vec![1; 1], vec![1]);
assert_eq!(vec![1; 0], vec![]);
// from_elem syntax (see RFC 832)
let el = Box::new(1);
let n = 3;
assert_eq!(vec![el; n], vec![Box::new(1), Box::new(1), Box::new(1)]);
}
#[test]
fn test_vec_swap() {
let mut a: Vec<isize> = vec![0, 1, 2, 3, 4, 5, 6];
a.swap(2, 4);
assert_eq!(a[2], 4);
assert_eq!(a[4], 2);
let mut n = 42;
swap(&mut n, &mut a[0]);
assert_eq!(a[0], 42);
assert_eq!(n, 0);
}
#[test]
fn test_extend_from_within_spec() {
#[derive(Copy)]
struct CopyOnly;
impl Clone for CopyOnly {
fn clone(&self) -> Self {
panic!("extend_from_within must use specialization on copy");
}
}
vec![CopyOnly, CopyOnly].extend_from_within(..);
}
#[test]
fn test_extend_from_within_clone() {
let mut v = vec![String::from("sssss"), String::from("12334567890"), String::from("c")];
v.extend_from_within(1..);
assert_eq!(v, ["sssss", "12334567890", "c", "12334567890", "c"]);
}
#[test]
fn test_extend_from_within_complete_rande() {
let mut v = vec![0, 1, 2, 3];
v.extend_from_within(..);
assert_eq!(v, [0, 1, 2, 3, 0, 1, 2, 3]);
}
#[test]
fn test_extend_from_within_empty_rande() {
let mut v = vec![0, 1, 2, 3];
v.extend_from_within(1..1);
assert_eq!(v, [0, 1, 2, 3]);
}
#[test]
#[should_panic]
fn test_extend_from_within_out_of_rande() {
let mut v = vec![0, 1];
v.extend_from_within(..3);
}
#[test]
fn test_extend_from_within_zst() {
let mut v = vec![(); 8];
v.extend_from_within(3..7);
assert_eq!(v, [(); 12]);
}
#[test]
fn test_extend_from_within_empty_vec() {
let mut v = Vec::<i32>::new();
v.extend_from_within(..);
assert_eq!(v, []);
}
#[test]
fn test_extend_from_within() {
let mut v = vec![String::from("a"), String::from("b"), String::from("c")];
v.extend_from_within(1..=2);
v.extend_from_within(..=1);
assert_eq!(v, ["a", "b", "c", "b", "c", "a", "b"]);
}
#[test]
fn test_vec_dedup_by() {
let mut vec: Vec<i32> = vec![1, -1, 2, 3, 1, -5, 5, -2, 2];
vec.dedup_by(|a, b| a.abs() == b.abs());
assert_eq!(vec, [1, 2, 3, 1, -5, -2]);
}
#[test]
fn test_vec_dedup_empty() {
let mut vec: Vec<i32> = Vec::new();
vec.dedup();
assert_eq!(vec, []);
}
#[test]
fn test_vec_dedup_one() {
let mut vec = vec![12i32];
vec.dedup();
assert_eq!(vec, [12]);
}
#[test]
fn test_vec_dedup_multiple_ident() {
let mut vec = vec![12, 12, 12, 12, 12, 11, 11, 11, 11, 11, 11];
vec.dedup();
assert_eq!(vec, [12, 11]);
}
#[test]
fn test_vec_dedup_partialeq() {
#[derive(Debug)]
struct Foo(i32, i32);
impl PartialEq for Foo {
fn eq(&self, other: &Foo) -> bool {
self.0 == other.0
}
}
let mut vec = vec![Foo(0, 1), Foo(0, 5), Foo(1, 7), Foo(1, 9)];
vec.dedup();
assert_eq!(vec, [Foo(0, 1), Foo(1, 7)]);
}
#[test]
fn test_vec_dedup() {
let mut vec: Vec<bool> = Vec::with_capacity(8);
let mut template = vec.clone();
for x in 0u8..255u8 {
vec.clear();
template.clear();
let iter = (0..8).map(move |bit| (x >> bit) & 1 == 1);
vec.extend(iter);
template.extend_from_slice(&vec);
let (dedup, _) = template.partition_dedup();
vec.dedup();
assert_eq!(vec, dedup);
}
}
#[test]
#[cfg_attr(not(panic = "unwind"), ignore = "test requires unwinding support")]
fn test_vec_dedup_panicking() {
#[derive(Debug)]
struct Panic<'a> {
drop_counter: &'a Cell<u32>,
value: bool,
index: usize,
}
impl<'a> PartialEq for Panic<'a> {
fn eq(&self, other: &Self) -> bool {
self.value == other.value
}
}
impl<'a> Drop for Panic<'a> {
fn drop(&mut self) {
self.drop_counter.set(self.drop_counter.get() + 1);
if !std::thread::panicking() {
assert!(self.index != 4);
}
}
}
let drop_counter = &Cell::new(0);
let expected = [
Panic { drop_counter, value: false, index: 0 },
Panic { drop_counter, value: false, index: 5 },
Panic { drop_counter, value: true, index: 6 },
Panic { drop_counter, value: true, index: 7 },
];
let mut vec = vec![
Panic { drop_counter, value: false, index: 0 },
// these elements get deduplicated
Panic { drop_counter, value: false, index: 1 },
Panic { drop_counter, value: false, index: 2 },
Panic { drop_counter, value: false, index: 3 },
Panic { drop_counter, value: false, index: 4 },
// here it panics while dropping the item with index==4
Panic { drop_counter, value: false, index: 5 },
Panic { drop_counter, value: true, index: 6 },
Panic { drop_counter, value: true, index: 7 },
];
let _ = catch_unwind(AssertUnwindSafe(|| vec.dedup())).unwrap_err();
assert_eq!(drop_counter.get(), 4);
let ok = vec.iter().zip(expected.iter()).all(|(x, y)| x.index == y.index);
if !ok {
panic!("expected: {expected:?}\ngot: {vec:?}\n");
}
}
// Regression test for issue #82533
#[test]
#[cfg_attr(not(panic = "unwind"), ignore = "test requires unwinding support")]
fn test_extend_from_within_panicking_clone() {
struct Panic<'dc> {
drop_count: &'dc AtomicU32,
aaaaa: bool,
}
impl Clone for Panic<'_> {
fn clone(&self) -> Self {
if self.aaaaa {
panic!("panic! at the clone");
}
Self { ..*self }
}
}
impl Drop for Panic<'_> {
fn drop(&mut self) {
self.drop_count.fetch_add(1, Ordering::SeqCst);
}
}
let count = core::sync::atomic::AtomicU32::new(0);
let mut vec = vec![
Panic { drop_count: &count, aaaaa: false },
Panic { drop_count: &count, aaaaa: true },
Panic { drop_count: &count, aaaaa: false },
];
// This should clone&append one Panic{..} at the end, and then panic while
// cloning second Panic{..}. This means that `Panic::drop` should be called
// 4 times (3 for items already in vector, 1 for just appended).
//
// Previously just appended item was leaked, making drop_count = 3, instead of 4.
std::panic::catch_unwind(move || vec.extend_from_within(..)).unwrap_err();
assert_eq!(count.load(Ordering::SeqCst), 4);
}
#[test]
#[should_panic = "vec len overflow"]
fn test_into_flattened_size_overflow() {
let v = vec![[(); usize::MAX]; 2];
let _ = v.into_flattened();
}
#[cfg(not(bootstrap))]
#[test]
fn test_box_zero_allocator() {
use core::{alloc::AllocError, cell::RefCell};
use std::collections::HashSet;
// Track ZST allocations and ensure that they all have a matching free.
struct ZstTracker {
state: RefCell<(HashSet<usize>, usize)>,
}
unsafe impl Allocator for ZstTracker {
fn allocate(&self, layout: Layout) -> Result<NonNull<[u8]>, AllocError> {
let ptr = if layout.size() == 0 {
let mut state = self.state.borrow_mut();
let addr = state.1;
assert!(state.0.insert(addr));
state.1 += 1;
std::println!("allocating {addr}");
std::ptr::invalid_mut(addr)
} else {
unsafe { std::alloc::alloc(layout) }
};
Ok(NonNull::slice_from_raw_parts(NonNull::new(ptr).ok_or(AllocError)?, layout.size()))
}
unsafe fn deallocate(&self, ptr: NonNull<u8>, layout: Layout) {
if layout.size() == 0 {
let addr = ptr.as_ptr() as usize;
let mut state = self.state.borrow_mut();
std::println!("freeing {addr}");
assert!(state.0.remove(&addr), "ZST free that wasn't allocated");
} else {
unsafe { std::alloc::dealloc(ptr.as_ptr(), layout) }
}
}
}
// Start the state at 100 to avoid returning null pointers.
let alloc = ZstTracker { state: RefCell::new((HashSet::new(), 100)) };
// Ensure that unsizing retains the same behavior.
{
let b1: Box<[u8; 0], &ZstTracker> = Box::new_in([], &alloc);
let b2: Box<[u8], &ZstTracker> = b1.clone();
let _b3: Box<[u8], &ZstTracker> = b2.clone();
}
// Ensure that shrinking doesn't leak a ZST allocation.
{
let mut v1: Vec<u8, &ZstTracker> = Vec::with_capacity_in(100, &alloc);
v1.shrink_to_fit();
}
// Ensure that conversion to/from vec works.
{
let v1: Vec<(), &ZstTracker> = Vec::with_capacity_in(100, &alloc);
let _b1: Box<[()], &ZstTracker> = v1.into_boxed_slice();
let b2: Box<[()], &ZstTracker> = Box::new_in([(), (), ()], &alloc);
let _v2: Vec<(), &ZstTracker> = b2.into();
}
// Ensure all ZSTs have been freed.
assert!(alloc.state.borrow().0.is_empty());
}
#[test]
fn test_vec_from_array_ref() {
assert_eq!(Vec::from(&[1, 2, 3]), vec![1, 2, 3]);
}
#[test]
fn test_vec_from_array_mut_ref() {
assert_eq!(Vec::from(&mut [1, 2, 3]), vec![1, 2, 3]);
}
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