nordic-dev.net/rust
nordic-dev.net/rust
2
0
Fork 0
mirror of https://github.com/rust-lang/rust.git synced 2024-10-31 22:41:50 +00:00
Code Issues Packages Projects Releases Wiki Activity

Rollup merge of #104081 - joshlf:patch-6, r=dtolnay

Browse Source 
PhantomData layout guarantees
This commit is contained in:
Matthias Krüger 2023-01-07 20:43:19 +01:00 committed by GitHub
commit 08653c8c57
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 6 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
library/core/src/marker.rs
View File

@ -623,6 +623,12 @@ impl<T: ?Sized> !Sync for *mut T {}
/// (ideally) or `PhantomData<*const T>` (if no lifetime applies), so
/// as not to indicate ownership.
///
/// ## Layout
///
/// For all `T`, the following are guaranteed:
/// * `size_of::<PhantomData<T>>() == 0`
/// * `align_of::<PhantomData<T>>() == 1`
///
/// [drop check]: ../../nomicon/dropck.html
#[lang = "phantom_data"]
#[stable(feature = "rust1", since = "1.0.0")]