diff options
Diffstat (limited to 'library/core/src/array')
| -rw-r--r-- | library/core/src/array/mod.rs | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/library/core/src/array/mod.rs b/library/core/src/array/mod.rs index c1d3aca6fdd..5730074bf27 100644 --- a/library/core/src/array/mod.rs +++ b/library/core/src/array/mod.rs @@ -19,6 +19,20 @@ mod iter; #[unstable(feature = "array_value_iter", issue = "65798")] pub use iter::IntoIter; +/// Converts a reference to `T` into a reference to an array of length 1 (without copying). +#[unstable(feature = "array_from_ref", issue = "none")] +pub fn from_ref<T>(s: &T) -> &[T; 1] { + // SAFETY: Converting `&T` to `&[T; 1]` is sound. + unsafe { &*(s as *const T).cast::<[T; 1]>() } +} + +/// Converts a mutable reference to `T` into a mutable reference to an array of length 1 (without copying). +#[unstable(feature = "array_from_ref", issue = "none")] +pub fn from_mut<T>(s: &mut T) -> &mut [T; 1] { + // SAFETY: Converting `&mut T` to `&mut [T; 1]` is sound. + unsafe { &mut *(s as *mut T).cast::<[T; 1]>() } +} + /// Utility trait implemented only on arrays of fixed size /// /// This trait can be used to implement other traits on fixed-size arrays |