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| -rw-r--r-- | src/liballoc/boxed.rs | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/src/liballoc/boxed.rs b/src/liballoc/boxed.rs index db7420954a0..5419491fc23 100644 --- a/src/liballoc/boxed.rs +++ b/src/liballoc/boxed.rs @@ -239,6 +239,16 @@ impl<T> Box<T> { pub fn pin(x: T) -> Pin<Box<T>> { (box x).into() } + + /// Converts a `Box<T>` into a `Box<[T]>` + /// + /// This conversion does not allocate on the heap and happens in place. + /// + #[unstable(feature = "box_into_boxed_slice", issue = "71582")] + pub fn into_boxed_slice(boxed: Box<T>) -> Box<[T]> { + // *mut T and *mut [T; 1] have the same size and alignment + unsafe { Box::from_raw(Box::into_raw(boxed) as *mut [T; 1] as *mut [T]) } + } } impl<T> Box<[T]> { |