4 #[cfg(panic = "unwind")]
9 assert_eq!(size_of::<u8>(), 1);
10 assert_eq!(size_of::<u16>(), 2);
11 assert_eq!(size_of::<u32>(), 4);
12 assert_eq!(size_of::<u64>(), 8);
16 #[cfg(target_pointer_width = "16")]
18 assert_eq!(size_of::<usize>(), 2);
19 assert_eq!(size_of::<*const usize>(), 2);
23 #[cfg(target_pointer_width = "32")]
25 assert_eq!(size_of::<usize>(), 4);
26 assert_eq!(size_of::<*const usize>(), 4);
30 #[cfg(target_pointer_width = "64")]
32 assert_eq!(size_of::<usize>(), 8);
33 assert_eq!(size_of::<*const usize>(), 8);
37 fn size_of_val_basic() {
38 assert_eq!(size_of_val(&1u8), 1);
39 assert_eq!(size_of_val(&1u16), 2);
40 assert_eq!(size_of_val(&1u32), 4);
41 assert_eq!(size_of_val(&1u64), 8);
46 assert_eq!(align_of::<u8>(), 1);
47 assert_eq!(align_of::<u16>(), 2);
48 assert_eq!(align_of::<u32>(), 4);
52 #[cfg(target_pointer_width = "16")]
54 assert_eq!(align_of::<usize>(), 2);
55 assert_eq!(align_of::<*const usize>(), 2);
59 #[cfg(target_pointer_width = "32")]
61 assert_eq!(align_of::<usize>(), 4);
62 assert_eq!(align_of::<*const usize>(), 4);
66 #[cfg(target_pointer_width = "64")]
68 assert_eq!(align_of::<usize>(), 8);
69 assert_eq!(align_of::<*const usize>(), 8);
73 fn align_of_val_basic() {
74 assert_eq!(align_of_val(&1u8), 1);
75 assert_eq!(align_of_val(&1u16), 2);
76 assert_eq!(align_of_val(&1u32), 4);
80 fn align_of_val_raw_packed() {
85 let storage = [0u8; 4];
86 let b: *const B = ptr::from_raw_parts(storage.as_ptr().cast(), 1);
87 assert_eq!(unsafe { align_of_val_raw(b) }, 1);
89 const ALIGN_OF_VAL_RAW: usize = {
90 let storage = [0u8; 4];
91 let b: *const B = ptr::from_raw_parts(storage.as_ptr().cast(), 1);
92 unsafe { align_of_val_raw(b) }
94 assert_eq!(ALIGN_OF_VAL_RAW, 1);
101 swap(&mut x, &mut y);
103 assert_eq!(y, 31337);
108 let mut x = Some("test".to_string());
109 let y = replace(&mut x, None);
110 assert!(x.is_none());
111 assert!(y.is_some());
115 fn test_transmute_copy() {
116 assert_eq!(1, unsafe { transmute_copy(&1) });
120 fn test_transmute_copy_shrink() {
121 assert_eq!(0_u8, unsafe { transmute_copy(&0_u64) });
125 fn test_transmute_copy_unaligned() {
133 let u = Unaligned::default();
134 assert_eq!(0_u64, unsafe { transmute_copy(&u.b) });
138 #[cfg(panic = "unwind")]
139 fn test_transmute_copy_grow_panics() {
142 let err = panic::catch_unwind(panic::AssertUnwindSafe(|| unsafe {
143 let _unused: u64 = transmute_copy(&1_u8);
147 Ok(_) => unreachable!(),
150 .downcast::<&'static str>()
152 if *s == "cannot transmute_copy if Dst is larger than Src" {
158 .unwrap_or_else(|p| panic::resume_unwind(p));
165 fn test_discriminant_send_sync() {
174 fn is_send_sync<T: Send + Sync>() {}
176 is_send_sync::<Discriminant<Regular>>();
177 is_send_sync::<Discriminant<NotSendSync>>();
181 fn assume_init_good() {
182 const TRUE: bool = unsafe { MaybeUninit::<bool>::new(true).assume_init() };
188 fn uninit_array_assume_init() {
189 let mut array = [MaybeUninit::<i16>::uninit(); 5];
196 let array = unsafe { array.transpose().assume_init() };
198 assert_eq!(array, [3, 1, 4, 1, 5]);
200 let [] = unsafe { [MaybeUninit::<!>::uninit(); 0].transpose().assume_init() };
204 fn uninit_write_slice() {
205 let mut dst = [MaybeUninit::new(255); 64];
208 assert_eq!(MaybeUninit::write_slice(&mut dst, &src), &src);
212 #[should_panic(expected = "source slice length (32) does not match destination slice length (64)")]
213 fn uninit_write_slice_panic_lt() {
214 let mut dst = [MaybeUninit::uninit(); 64];
217 MaybeUninit::write_slice(&mut dst, &src);
221 #[should_panic(expected = "source slice length (128) does not match destination slice length (64)")]
222 fn uninit_write_slice_panic_gt() {
223 let mut dst = [MaybeUninit::uninit(); 64];
226 MaybeUninit::write_slice(&mut dst, &src);
230 fn uninit_clone_from_slice() {
231 let mut dst = [MaybeUninit::new(255); 64];
234 assert_eq!(MaybeUninit::write_slice_cloned(&mut dst, &src), &src);
238 #[should_panic(expected = "destination and source slices have different lengths")]
239 fn uninit_write_slice_cloned_panic_lt() {
240 let mut dst = [MaybeUninit::uninit(); 64];
243 MaybeUninit::write_slice_cloned(&mut dst, &src);
247 #[should_panic(expected = "destination and source slices have different lengths")]
248 fn uninit_write_slice_cloned_panic_gt() {
249 let mut dst = [MaybeUninit::uninit(); 64];
252 MaybeUninit::write_slice_cloned(&mut dst, &src);
256 #[cfg(panic = "unwind")]
257 fn uninit_write_slice_cloned_mid_panic() {
260 enum IncrementOrPanic {
266 impl Clone for IncrementOrPanic {
267 fn clone(&self) -> Self {
269 Self::Increment(rc) => Self::Increment(rc.clone()),
270 Self::ExpectedPanic => panic!("expected panic on clone"),
271 Self::UnexpectedPanic => panic!("unexpected panic on clone"),
276 let rc = Rc::new(());
279 MaybeUninit::uninit(),
280 MaybeUninit::uninit(),
281 MaybeUninit::uninit(),
282 MaybeUninit::uninit(),
286 IncrementOrPanic::Increment(rc.clone()),
287 IncrementOrPanic::Increment(rc.clone()),
288 IncrementOrPanic::ExpectedPanic,
289 IncrementOrPanic::UnexpectedPanic,
292 let err = panic::catch_unwind(panic::AssertUnwindSafe(|| {
293 MaybeUninit::write_slice_cloned(&mut dst, &src);
299 Ok(_) => unreachable!(),
302 .downcast::<&'static str>()
303 .and_then(|s| if *s == "expected panic on clone" { Ok(s) } else { Err(s) })
304 .unwrap_or_else(|p| panic::resume_unwind(p));
306 assert_eq!(Rc::strong_count(&rc), 1)
312 fn uninit_write_slice_cloned_no_drop() {
318 panic!("dropped a bomb! kaboom")
322 let mut dst = [MaybeUninit::uninit()];
325 MaybeUninit::write_slice_cloned(&mut dst, &src);
331 fn uninit_const_assume_init_read() {
332 const FOO: u32 = unsafe { MaybeUninit::new(42).assume_init_read() };
337 fn const_maybe_uninit() {
340 #[derive(Debug, PartialEq)]
346 const FIELD_BY_FIELD: Foo = unsafe {
347 let mut val = MaybeUninit::uninit();
348 init_y(&mut val); // order shouldn't matter
353 const fn init_x(foo: &mut MaybeUninit<Foo>) {
355 *ptr::addr_of_mut!((*foo.as_mut_ptr()).x) = 1;
359 const fn init_y(foo: &mut MaybeUninit<Foo>) {
361 *ptr::addr_of_mut!((*foo.as_mut_ptr()).y) = 2;
365 assert_eq!(FIELD_BY_FIELD, Foo { x: 1, y: 2 });