itsscb/rust
1
0
Fork 0
mirror of https://github.com/rust-lang/rust.git synced 2025-11-17 10:36:39 +00:00
Code Issues Packages Projects Releases Wiki Activity

Update rc.rs docs

Browse Source 
Update comment per review feedback
This commit is contained in:
Jon Bauman 2025-05-06 13:19:42 -07:00 committed by GitHub
parent dd20225681
commit 6a4af821b0
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
1 changed files with 5 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
library/alloc/src/rc.rs
View File

@ -3536,11 +3536,11 @@ impl<T> Default for Weak<T> {
}
}
// NOTE: We wrapping_add here to deal with mem::forget safely. In particular
// if you mem::forget Rcs (or Weaks), the ref-count can overflow, and then
// you can free the allocation while outstanding Rcs (or Weaks) exist.
// We abort because this is such a degenerate scenario that we don't care about
// what happens -- no real program should ever experience this.
// NOTE: If you mem::forget Rcs (or Weaks), drop is skipped and the ref-count
// is not decremented, meaning the ref-count can overflow, and then you can
// free the allocation while outstanding Rcs (or Weaks) exist, which would be
// unsound. We abort because this is such a degenerate scenario that we don't
// care about what happens -- no real program should ever experience this.
//
// This should have negligible overhead since you don't actually need to
// clone these much in Rust thanks to ownership and move-semantics.