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Add examples for unsized {Rc,Arc}::from_raw

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John-John Tedro 2024-01-28 16:07:07 +01:00
parent 57e0dea178
commit d4adb3af58
2 changed files with 28 additions and 0 deletions
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14
library/alloc/src/rc.rs
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@ -1225,6 +1225,20 @@ impl<T: ?Sized> Rc<T> {
///
/// // The memory was freed when `x` went out of scope above, so `x_ptr` is now dangling!
/// ```
///
/// Convert a slice back into its original array:
///
/// ```
/// use std::rc::Rc;
///
/// let x: Rc<[u32]> = Rc::new([1, 2, 3]);
/// let x_ptr: *const [u32] = Rc::into_raw(x);
///
/// unsafe {
/// let x: Rc<[u32; 3]> = Rc::from_raw(x_ptr.cast::<[u32; 3]>())
/// assert_eq!(x.as_ref(), &[1, 2, 3]);
/// }
/// ```
#[inline]
#[stable(feature = "rc_raw", since = "1.17.0")]
pub unsafe fn from_raw(ptr: *const T) -> Self {

14
library/alloc/src/sync.rs
View file

@ -1371,6 +1371,20 @@ impl<T: ?Sized> Arc<T> {
///
/// // The memory was freed when `x` went out of scope above, so `x_ptr` is now dangling!
/// ```
///
/// Convert a slice back into its original array:
///
/// ```
/// use std::sync::Arc;
///
/// let x: Arc<[u32]> = Arc::new([1, 2, 3]);
/// let x_ptr: *const [u32] = Arc::into_raw(x);
///
/// unsafe {
/// let x: Arc<[u32; 3]> = Arc::from_raw(x_ptr.cast::<[u32; 3]>())
/// assert_eq!(x.as_ref(), &[1, 2, 3]);
/// }
/// ```
#[inline]
#[stable(feature = "rc_raw", since = "1.17.0")]
pub unsafe fn from_raw(ptr: *const T) -> Self {