Trait tracing_core::stdlib::ops::DerefPure

pub unsafe trait DerefPure { }

🔬This is a nightly-only experimental API. (deref_pure_trait #87121)

Perma-unstable marker trait. Indicates that the type has a well-behaved Deref (and, if applicable, DerefMut) implementation. This is relied on for soundness of deref patterns.

FIXME(deref_patterns): The precise semantics are undecided; the rough idea is that successive calls to deref/deref_mut without intermediate mutation should be idempotent, in the sense that they return the same value as far as pattern-matching is concerned. Calls to deref/deref_mut must leave the pointer itself likewise unchanged.

Implementors

impl DerefPure for String

impl<B> DerefPure for Cow<'_, B>

where B: ToOwned + ?Sized, <B as ToOwned>::Owned: Borrow<B>,

impl<Ptr> DerefPure for Pin<Ptr>

where Ptr: DerefPure,

impl<T> DerefPure for &T

where T: ?Sized,

impl<T> DerefPure for &mut T

where T: ?Sized,

impl<T> DerefPure for Ref<'_, T>

where T: ?Sized,

impl<T> DerefPure for RefMut<'_, T>

where T: ?Sized,

impl<T> DerefPure for ManuallyDrop<T>

where T: ?Sized,

impl<T, A> DerefPure for Box<T, A>

where A: Allocator, T: ?Sized,

impl<T, A> DerefPure for Rc<T, A>

where A: Allocator, T: ?Sized,

impl<T, A> DerefPure for Arc<T, A>

where A: Allocator, T: ?Sized,

impl<T, A> DerefPure for Vec<T, A>

where A: Allocator,