Skip to content

Mention that casting to *const () is a way to roundtrip with from_raw_parts #143341

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 1 commit into from
Aug 27, 2025
Merged

Mention that casting to *const () is a way to roundtrip with from_raw_parts #143341

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
3 changes: 3 additions & 0 deletions library/core/src/ptr/metadata.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -106,6 +106,9 @@ pub const fn metadata<T: PointeeSized>(ptr: *const T) -> <T as Pointee>::Metadat
/// For slices, see the documentation of [`slice::from_raw_parts`] for safety requirements.
/// For trait objects, the metadata must come from a pointer to the same underlying erased type.
///
/// If you are attempting to deconstruct a DST in a generic context to be reconstructed later,
/// a thin pointer can always be obtained by casting `*const T` to `*const ()`.
///
/// [`slice::from_raw_parts`]: crate::slice::from_raw_parts
#[unstable(feature = "ptr_metadata", issue = "81513")]
#[inline]
Expand Down
Loading