3 #[cfg(panic = "unwind")]
8 assert_eq!(size_of::<u8>(), 1);
9 assert_eq!(size_of::<u16>(), 2);
10 assert_eq!(size_of::<u32>(), 4);
11 assert_eq!(size_of::<u64>(), 8);
15 #[cfg(target_pointer_width = "16")]
17 assert_eq!(size_of::<usize>(), 2);
18 assert_eq!(size_of::<*const usize>(), 2);
22 #[cfg(target_pointer_width = "32")]
24 assert_eq!(size_of::<usize>(), 4);
25 assert_eq!(size_of::<*const usize>(), 4);
29 #[cfg(target_pointer_width = "64")]
31 assert_eq!(size_of::<usize>(), 8);
32 assert_eq!(size_of::<*const usize>(), 8);
36 fn size_of_val_basic() {
37 assert_eq!(size_of_val(&1u8), 1);
38 assert_eq!(size_of_val(&1u16), 2);
39 assert_eq!(size_of_val(&1u32), 4);
40 assert_eq!(size_of_val(&1u64), 8);
45 assert_eq!(align_of::<u8>(), 1);
46 assert_eq!(align_of::<u16>(), 2);
47 assert_eq!(align_of::<u32>(), 4);
51 #[cfg(target_pointer_width = "16")]
53 assert_eq!(align_of::<usize>(), 2);
54 assert_eq!(align_of::<*const usize>(), 2);
58 #[cfg(target_pointer_width = "32")]
60 assert_eq!(align_of::<usize>(), 4);
61 assert_eq!(align_of::<*const usize>(), 4);
65 #[cfg(target_pointer_width = "64")]
67 assert_eq!(align_of::<usize>(), 8);
68 assert_eq!(align_of::<*const usize>(), 8);
72 fn align_of_val_basic() {
73 assert_eq!(align_of_val(&1u8), 1);
74 assert_eq!(align_of_val(&1u16), 2);
75 assert_eq!(align_of_val(&1u32), 4);
89 let mut x = Some("test".to_string());
90 let y = replace(&mut x, None);
96 fn test_transmute_copy() {
97 assert_eq!(1, unsafe { transmute_copy(&1) });
101 fn test_transmute() {
105 impl Foo for isize {}
107 let a = box 100isize as Box<dyn Foo>;
109 let x: ::core::raw::TraitObject = transmute(a);
110 assert!(*(x.data as *const isize) == 100);
111 let _x: Box<dyn Foo> = transmute(x);
115 assert_eq!(transmute::<_, Vec<u8>>("L".to_string()), [76]);
121 fn test_discriminant_send_sync() {
130 fn is_send_sync<T: Send + Sync>() {}
132 is_send_sync::<Discriminant<Regular>>();
133 is_send_sync::<Discriminant<NotSendSync>>();
137 fn assume_init_good() {
138 const TRUE: bool = unsafe { MaybeUninit::<bool>::new(true).assume_init() };
144 fn uninit_array_assume_init() {
145 let mut array: [MaybeUninit<i16>; 5] = MaybeUninit::uninit_array();
152 let array = unsafe { MaybeUninit::array_assume_init(array) };
154 assert_eq!(array, [3, 1, 4, 1, 5]);
158 fn uninit_write_slice() {
159 let mut dst = [MaybeUninit::new(255); 64];
162 assert_eq!(MaybeUninit::write_slice(&mut dst, &src), &src);
166 #[should_panic(expected = "source slice length (32) does not match destination slice length (64)")]
167 fn uninit_write_slice_panic_lt() {
168 let mut dst = [MaybeUninit::uninit(); 64];
171 MaybeUninit::write_slice(&mut dst, &src);
175 #[should_panic(expected = "source slice length (128) does not match destination slice length (64)")]
176 fn uninit_write_slice_panic_gt() {
177 let mut dst = [MaybeUninit::uninit(); 64];
180 MaybeUninit::write_slice(&mut dst, &src);
184 fn uninit_clone_from_slice() {
185 let mut dst = [MaybeUninit::new(255); 64];
188 assert_eq!(MaybeUninit::write_slice_cloned(&mut dst, &src), &src);
192 #[should_panic(expected = "destination and source slices have different lengths")]
193 fn uninit_write_slice_cloned_panic_lt() {
194 let mut dst = [MaybeUninit::uninit(); 64];
197 MaybeUninit::write_slice_cloned(&mut dst, &src);
201 #[should_panic(expected = "destination and source slices have different lengths")]
202 fn uninit_write_slice_cloned_panic_gt() {
203 let mut dst = [MaybeUninit::uninit(); 64];
206 MaybeUninit::write_slice_cloned(&mut dst, &src);
210 #[cfg(panic = "unwind")]
211 fn uninit_write_slice_cloned_mid_panic() {
214 enum IncrementOrPanic {
220 impl Clone for IncrementOrPanic {
221 fn clone(&self) -> Self {
223 Self::Increment(rc) => Self::Increment(rc.clone()),
224 Self::ExpectedPanic => panic!("expected panic on clone"),
225 Self::UnexpectedPanic => panic!("unexpected panic on clone"),
230 let rc = Rc::new(());
233 MaybeUninit::uninit(),
234 MaybeUninit::uninit(),
235 MaybeUninit::uninit(),
236 MaybeUninit::uninit(),
240 IncrementOrPanic::Increment(rc.clone()),
241 IncrementOrPanic::Increment(rc.clone()),
242 IncrementOrPanic::ExpectedPanic,
243 IncrementOrPanic::UnexpectedPanic,
246 let err = panic::catch_unwind(panic::AssertUnwindSafe(|| {
247 MaybeUninit::write_slice_cloned(&mut dst, &src);
253 Ok(_) => unreachable!(),
256 .downcast::<&'static str>()
257 .and_then(|s| if *s == "expected panic on clone" { Ok(s) } else { Err(s) })
258 .unwrap_or_else(|p| panic::resume_unwind(p));
260 assert_eq!(Rc::strong_count(&rc), 1)
266 fn uninit_write_slice_cloned_no_drop() {
272 panic!("dropped a bomb! kaboom")
276 let mut dst = [MaybeUninit::uninit()];
279 MaybeUninit::write_slice_cloned(&mut dst, &src);
285 #[cfg(not(bootstrap))]
286 fn uninit_const_assume_init_read() {
287 const FOO: u32 = unsafe { MaybeUninit::new(42).assume_init_read() };