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Auto merge of #27358 - bluss:split-at-mut, r=aturon

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Use raw pointers to avoid aliasing violation in split_at_mut

Fixes #27357
This commit is contained in:
bors 2015-07-29 09:57:50 +00:00
commit d10ff632ce
1 changed files with 5 additions and 4 deletions
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9
src/libcore/slice.rs
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@ -300,11 +300,12 @@ impl<T> SliceExt for [T] {
#[inline]
fn split_at_mut(&mut self, mid: usize) -> (&mut [T], &mut [T]) {
let len = self.len();
let ptr = self.as_mut_ptr();
assert!(mid <= len);
unsafe {
let self2: &mut [T] = mem::transmute_copy(&self);
(ops::IndexMut::index_mut(self, ops::RangeTo { end: mid } ),
ops::IndexMut::index_mut(self2, ops::RangeFrom { start: mid } ))
(from_raw_parts_mut(ptr, mid),
from_raw_parts_mut(ptr.offset(mid as isize), len - mid))
}
}