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Rollup merge of 21663 - tbu-:pr_doc_cell_static_safety, r=alexcrichton

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Manish Goregaokar 2015-01-29 03:15:25 +05:30
commit 518ce538a9
1 changed files with 0 additions and 6 deletions
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6
src/libcore/cell.rs
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@ -594,12 +594,6 @@ impl<'b, T> DerefMut for RefMut<'b, T> {
/// The `UnsafeCell<T>` type is the only legal way to obtain aliasable data that is considered
/// mutable. In general, transmuting an `&T` type into an `&mut T` is considered undefined behavior.
///
/// Although it is possible to put an `UnsafeCell<T>` into static item, it is not permitted to take
/// the address of the static item if the item is not declared as mutable. This rule exists because
/// immutable static items are stored in read-only memory, and thus any attempt to mutate their
/// interior can cause segfaults. Immutable static items containing `UnsafeCell<T>` instances are
/// still useful as read-only initializers, however, so we do not forbid them altogether.
///
/// Types like `Cell<T>` and `RefCell<T>` use this type to wrap their internal data.
///
/// `UnsafeCell<T>` doesn't opt-out from any marker traits, instead, types with an `UnsafeCell<T>`