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| author | Slanterns <slanterns.w@gmail.com> | 2024-10-22 01:08:15 -0700 |
|---|---|---|
| committer | Slanterns <slanterns.w@gmail.com> | 2024-10-22 01:37:53 -0700 |
| commit | 5b12d906bb66d308fb3e94d6d79e076fa87c7f7c (patch) | |
| tree | 387a0e34450b749c71355bf725c372d2f5c999be | |
| parent | 1de57a5ce952c722f7053aeacfc6c90bc139b678 (diff) | |
| download | rust-5b12d906bb66d308fb3e94d6d79e076fa87c7f7c.tar.gz rust-5b12d906bb66d308fb3e94d6d79e076fa87c7f7c.zip | |
optimize `Rc<T>::default`
| -rw-r--r-- | library/alloc/src/rc.rs | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/library/alloc/src/rc.rs b/library/alloc/src/rc.rs index e98ae7c31ad..582d850e14b 100644 --- a/library/alloc/src/rc.rs +++ b/library/alloc/src/rc.rs @@ -2312,7 +2312,16 @@ impl<T: Default> Default for Rc<T> { /// ``` #[inline] fn default() -> Rc<T> { - Rc::new(Default::default()) + unsafe { + Self::from_inner( + Box::leak(Box::write(Box::new_uninit(), RcInner { + strong: Cell::new(1), + weak: Cell::new(1), + value: T::default(), + })) + .into(), + ) + } } } |