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refactor Arc<T>::default

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Slanterns 2024-10-22 01:37:13 -07:00
parent 7782401c52
commit 0a963ab2da
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1 changed files with 10 additions and 7 deletions
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17
library/alloc/src/sync.rs
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@ -3447,13 +3447,16 @@ impl<T: Default> Default for Arc<T> {
/// assert_eq!(*x, 0); /// assert_eq!(*x, 0);
/// ``` /// ```
fn default() -> Arc<T> { fn default() -> Arc<T> {
let x = Box::into_raw(Box::write(Box::new_uninit(), ArcInner { unsafe {
strong: atomic::AtomicUsize::new(1), Self::from_inner(
weak: atomic::AtomicUsize::new(1), Box::leak(Box::write(Box::new_uninit(), ArcInner {
data: T::default(), strong: atomic::AtomicUsize::new(1),
})); weak: atomic::AtomicUsize::new(1),
// SAFETY: `Box::into_raw` consumes the `Box` and never returns null data: T::default(),
unsafe { Self::from_inner(NonNull::new_unchecked(x)) } }))
.into(),
)
}
} }
} }