Skip to content

Note the layout of pointers to T:Sized matches that of C pointers #100

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 2 commits into from
Apr 11, 2019
Merged

Note the layout of pointers to T:Sized matches that of C pointers #100

Changes from 1 commit
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
9471a9a
Note the layout of pointers to T:Sized matches that of C pointers
gnzlbg Mar 14, 2019
228a0fd
Add warning about reference validity
gnzlbg Mar 15, 2019
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
4 changes: 4 additions & 0 deletions reference/src/layout/pointers.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -31,6 +31,10 @@ and are at least one word.

The layouts of `&T`, `&mut T` and `*T` are the same.

If `T` is sized, references and pointers to `T` have a size and alignment of one
word and have therefore the same layout as C pointers - they can be used in C FFI
where pointers are expected.

We do not make any guarantees about the layout of
multi-trait objects `&(dyn T + U)` or references to other dynamically sized types,
other than that they are at least word-aligned, and have size at least one word.
Expand Down