Trait tracing_core::stdlib::ops::DerefPure

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pub unsafe trait DerefPure { }
🔬This is a nightly-only experimental API. (deref_pure_trait #87121)
Expand description

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.

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impl DerefPure for String

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impl<B> DerefPure for Cow<'_, B>
where B: ToOwned + ?Sized, <B as ToOwned>::Owned: Borrow<B>,

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impl<Ptr> DerefPure for Pin<Ptr>
where Ptr: DerefPure,

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impl<T> DerefPure for &T
where T: ?Sized,

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impl<T> DerefPure for &mut T
where T: ?Sized,

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impl<T> DerefPure for Ref<'_, T>
where T: ?Sized,

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impl<T> DerefPure for RefMut<'_, T>
where T: ?Sized,

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impl<T> DerefPure for ManuallyDrop<T>
where T: ?Sized,

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impl<T, A> DerefPure for Box<T, A>
where A: Allocator, T: ?Sized,

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impl<T, A> DerefPure for Rc<T, A>
where A: Allocator, T: ?Sized,

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impl<T, A> DerefPure for Arc<T, A>
where A: Allocator, T: ?Sized,

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impl<T, A> DerefPure for Vec<T, A>
where A: Allocator,