diff options
| -rw-r--r-- | library/core/src/pin.rs | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/library/core/src/pin.rs b/library/core/src/pin.rs index 9f0284d5d95..b73cd046e5a 100644 --- a/library/core/src/pin.rs +++ b/library/core/src/pin.rs @@ -781,6 +781,34 @@ impl<'a, T: ?Sized> Pin<&'a mut T> { } } +impl<T: ?Sized> Pin<&'static T> { + /// Get a pinned reference from a static reference. + /// + /// This is safe, because `T` is borrowed for the `'static` lifetime, which + /// never ends. + #[unstable(feature = "pin_static_ref", issue = "none")] + #[rustc_const_unstable(feature = "const_pin", issue = "76654")] + pub const fn static_ref(r: &'static T) -> Pin<&'static T> { + // SAFETY: The 'static borrow guarantees the data will not be + // moved/invalidated until it gets dropped (which is never). + unsafe { Pin::new_unchecked(r) } + } +} + +impl<T: ?Sized> Pin<&'static mut T> { + /// Get a pinned mutable reference from a static mutable reference. + /// + /// This is safe, because `T` is borrowed for the `'static` lifetime, which + /// never ends. + #[unstable(feature = "pin_static_ref", issue = "none")] + #[rustc_const_unstable(feature = "const_pin", issue = "76654")] + pub const fn static_mut(r: &'static mut T) -> Pin<&'static mut T> { + // SAFETY: The 'static borrow guarantees the data will not be + // moved/invalidated until it gets dropped (which is never). + unsafe { Pin::new_unchecked(r) } + } +} + #[stable(feature = "pin", since = "1.33.0")] impl<P: Deref> Deref for Pin<P> { type Target = P::Target; |