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Mark boxed::into_raw as safe

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By the same logic that `mem::forget` is safe, `boxed::into_raw` is actually a safe function. Fixes #25755.
This commit is contained in:
Michael Layzell 2015-05-24 21:45:29 -04:00
parent 893e416933
commit 04ab4a3471
1 changed files with 3 additions and 7 deletions
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10
src/liballoc/boxed.rs
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@ -139,24 +139,20 @@ pub unsafe fn from_raw(raw: *mut T) -> Self {
/// convert pointer back to `Box` with `Box::from_raw` function, because
/// `Box` does not specify, how memory is allocated.
///
/// Function is unsafe, because result of this function is no longer
/// automatically managed that may lead to memory or other resource
/// leak.
///
/// # Examples
/// ```
/// # #![feature(alloc)]
/// use std::boxed;
///
/// let seventeen = Box::new(17u32);
/// let raw = unsafe { boxed::into_raw(seventeen) };
/// let raw = boxed::into_raw(seventeen);
/// let boxed_again = unsafe { Box::from_raw(raw) };
/// ```
#[unstable(feature = "alloc",
reason = "may be renamed")]
#[inline]
pub unsafe fn into_raw<T : ?Sized>(b: Box<T>) -> *mut T {
mem::transmute(b)
pub fn into_raw<T : ?Sized>(b: Box<T>) -> *mut T {
unsafe { mem::transmute(b) }
}
#[stable(feature = "rust1", since = "1.0.0")]