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Remove unnecessary unsafe code in Arc deferred initialization examples.

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This commit is contained in:
Jakob Degen 2022-01-20 05:36:19 -05:00
parent 7bc47cfd92
commit 4de76184aa
2 changed files with 42 additions and 58 deletions
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40
library/alloc/src/rc.rs
View File

@ -451,12 +451,10 @@ pub fn new_cyclic(data_fn: impl FnOnce(&Weak<T>) -> T) -> Rc<T> {
///
/// let mut five = Rc::<u32>::new_uninit();
///
/// let five = unsafe {
/// // Deferred initialization:
/// Rc::get_mut_unchecked(&mut five).as_mut_ptr().write(5);
/// Rc::get_mut(&mut five).unwrap().write(5);
///
/// five.assume_init()
/// };
/// let five = unsafe { five.assume_init() };
///
/// assert_eq!(*five, 5)
/// ```
@ -543,12 +541,10 @@ pub fn try_new(value: T) -> Result<Rc<T>, AllocError> {
///
/// let mut five = Rc::<u32>::try_new_uninit()?;
///
/// let five = unsafe {
/// // Deferred initialization:
/// Rc::get_mut_unchecked(&mut five).as_mut_ptr().write(5);
/// Rc::get_mut(&mut five).unwrap().write(5);
///
/// five.assume_init()
/// };
/// let five = unsafe { five.assume_init() };
///
/// assert_eq!(*five, 5);
/// # Ok::<(), std::alloc::AllocError>(())
@ -660,14 +656,13 @@ impl<T> Rc<[T]> {
///
/// let mut values = Rc::<[u32]>::new_uninit_slice(3);
///
/// let values = unsafe {
/// // Deferred initialization:
/// Rc::get_mut_unchecked(&mut values)[0].as_mut_ptr().write(1);
/// Rc::get_mut_unchecked(&mut values)[1].as_mut_ptr().write(2);
/// Rc::get_mut_unchecked(&mut values)[2].as_mut_ptr().write(3);
/// let data = Rc::get_mut(&mut values).unwrap();
/// data[0].write(1);
/// data[1].write(2);
/// data[2].write(3);
///
/// values.assume_init()
/// };
/// let values = unsafe { values.assume_init() };
///
/// assert_eq!(*values, [1, 2, 3])
/// ```
@ -738,12 +733,10 @@ impl<T> Rc<mem::MaybeUninit<T>> {
///
/// let mut five = Rc::<u32>::new_uninit();
///
/// let five = unsafe {
/// // Deferred initialization:
/// Rc::get_mut_unchecked(&mut five).as_mut_ptr().write(5);
/// Rc::get_mut(&mut five).unwrap().write(5);
///
/// five.assume_init()
/// };
/// let five = unsafe { five.assume_init() };
///
/// assert_eq!(*five, 5)
/// ```
@ -777,14 +770,13 @@ impl<T> Rc<[mem::MaybeUninit<T>]> {
///
/// let mut values = Rc::<[u32]>::new_uninit_slice(3);
///
/// let values = unsafe {
/// // Deferred initialization:
/// Rc::get_mut_unchecked(&mut values)[0].as_mut_ptr().write(1);
/// Rc::get_mut_unchecked(&mut values)[1].as_mut_ptr().write(2);
/// Rc::get_mut_unchecked(&mut values)[2].as_mut_ptr().write(3);
/// let data = Rc::get_mut(&mut values).unwrap();
/// data[0].write(1);
/// data[1].write(2);
/// data[2].write(3);
///
/// values.assume_init()
/// };
/// let values = unsafe { values.assume_init() };
///
/// assert_eq!(*values, [1, 2, 3])
/// ```

40
library/alloc/src/sync.rs
View File

@ -437,12 +437,10 @@ pub fn new_cyclic(data_fn: impl FnOnce(&Weak<T>) -> T) -> Arc<T> {
///
/// let mut five = Arc::<u32>::new_uninit();
///
/// let five = unsafe {
/// // Deferred initialization:
/// Arc::get_mut_unchecked(&mut five).as_mut_ptr().write(5);
/// Arc::get_mut(&mut five).unwrap().write(5);
///
/// five.assume_init()
/// };
/// let five = unsafe { five.assume_init() };
///
/// assert_eq!(*five, 5)
/// ```
@ -545,12 +543,10 @@ pub fn try_new(data: T) -> Result<Arc<T>, AllocError> {
///
/// let mut five = Arc::<u32>::try_new_uninit()?;
///
/// let five = unsafe {
/// // Deferred initialization:
/// Arc::get_mut_unchecked(&mut five).as_mut_ptr().write(5);
/// Arc::get_mut(&mut five).unwrap().write(5);
///
/// five.assume_init()
/// };
/// let five = unsafe { five.assume_init() };
///
/// assert_eq!(*five, 5);
/// # Ok::<(), std::alloc::AllocError>(())
@ -652,14 +648,13 @@ impl<T> Arc<[T]> {
///
/// let mut values = Arc::<[u32]>::new_uninit_slice(3);
///
/// let values = unsafe {
/// // Deferred initialization:
/// Arc::get_mut_unchecked(&mut values)[0].as_mut_ptr().write(1);
/// Arc::get_mut_unchecked(&mut values)[1].as_mut_ptr().write(2);
/// Arc::get_mut_unchecked(&mut values)[2].as_mut_ptr().write(3);
/// let data = Arc::get_mut(&mut values).unwrap();
/// data[0].write(1);
/// data[1].write(2);
/// data[2].write(3);
///
/// values.assume_init()
/// };
/// let values = unsafe { values.assume_init() };
///
/// assert_eq!(*values, [1, 2, 3])
/// ```
@ -730,12 +725,10 @@ impl<T> Arc<mem::MaybeUninit<T>> {
///
/// let mut five = Arc::<u32>::new_uninit();
///
/// let five = unsafe {
/// // Deferred initialization:
/// Arc::get_mut_unchecked(&mut five).as_mut_ptr().write(5);
/// Arc::get_mut(&mut five).unwrap().write(5);
///
/// five.assume_init()
/// };
/// let five = unsafe { five.assume_init() };
///
/// assert_eq!(*five, 5)
/// ```
@ -770,14 +763,13 @@ impl<T> Arc<[mem::MaybeUninit<T>]> {
///
/// let mut values = Arc::<[u32]>::new_uninit_slice(3);
///
/// let values = unsafe {
/// // Deferred initialization:
/// Arc::get_mut_unchecked(&mut values)[0].as_mut_ptr().write(1);
/// Arc::get_mut_unchecked(&mut values)[1].as_mut_ptr().write(2);
/// Arc::get_mut_unchecked(&mut values)[2].as_mut_ptr().write(3);
/// let data = Arc::get_mut(&mut values).unwrap();
/// data[0].write(1);
/// data[1].write(2);
/// data[2].write(3);
///
/// values.assume_init()
/// };
/// let values = unsafe { values.assume_init() };
///
/// assert_eq!(*values, [1, 2, 3])
/// ```