core::pin

Trait PinCoerceUnsized

pub unsafe trait PinCoerceUnsized: Deref { }

🔬This is a nightly-only experimental API. (pin_coerce_unsized_trait #150112)

Expand description

Trait that indicates that this is a pointer or a wrapper for one, where unsizing can be performed on the pointee when it is pinned.

§Safety

Given a pointer of this type, the concrete type returned by its deref method and (if it implements DerefMut) its deref_mut method must be the same type and must not change without a modification. The following operations are not considered modifications:

Moving the pointer.
Performing unsizing coercions on the pointer.
Performing dynamic dispatch with the pointer.
Calling deref or deref_mut on the pointer.

The concrete type of a trait object is the type that the vtable corresponds to. The concrete type of a slice is an array of the same element type and the length specified in the metadata. The concrete type of a sized type is the type itself.