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Change transmute()s in IdxSet::{from_slice, from_slice_mut} to casts

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This commit is contained in:
ljedrz 2018-08-09 16:59:10 +02:00
parent ffdac5d592
commit 160187937d
1 changed files with 2 additions and 6 deletions
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8
src/librustc_data_structures/indexed_set.rs
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@ -59,10 +59,6 @@ impl<T: Idx> rustc_serialize::Decodable for IdxSetBuf<T> {
// pnkfelix wants to have this be `IdxSet<T>([Word]) and then pass
// around `&mut IdxSet<T>` or `&IdxSet<T>`.
//
// WARNING: Mapping a `&IdxSetBuf<T>` to `&IdxSet<T>` (at least today)
// requires a transmute relying on representation guarantees that may
// not hold in the future.
/// Represents a set (or packed family of sets), of some element type
/// E, where each E is identified by some unique index type `T`.
@ -134,11 +130,11 @@ impl<T: Idx> IdxSetBuf<T> {
impl<T: Idx> IdxSet<T> {
unsafe fn from_slice(s: &[Word]) -> &Self {
mem::transmute(s) // (see above WARNING)
&*(s as *const [Word] as *const Self)
}
unsafe fn from_slice_mut(s: &mut [Word]) -> &mut Self {
mem::transmute(s) // (see above WARNING)
&mut *(s as *mut [Word] as *mut Self)
}
}