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add comment explaining why what we do is legal

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Ralf Jung 2018-11-17 10:20:28 +01:00
parent 41434e001b
commit 25d46f3091
1 changed files with 2 additions and 0 deletions
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src/libcore/cell.rs
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@ -1509,6 +1509,8 @@ impl<T: ?Sized> UnsafeCell<T> {
#[inline] #[inline]
#[stable(feature = "rust1", since = "1.0.0")] #[stable(feature = "rust1", since = "1.0.0")]
pub const fn get(&self) -> *mut T { pub const fn get(&self) -> *mut T {
// We can just cast the pointer from `UnsafeCell<T>` to `T` because of
// #[repr(transparent)]
self as *const UnsafeCell<T> as *const T as *mut T self as *const UnsafeCell<T> as *const T as *mut T
} }
} }