🚸 Add lifetime annotation to write_spec[]#140
Merged
Conversation
Problem: - `operator[]` on a (non-`const`) `write_spec` returns a `field_proxy` so that assignment works. This means that code like this is a pitfall: ```cpp auto result = sync_read(group / "reg.field_f"); // missing const return result["reg.field"_f]; // operator[] called on non-const ``` This code returns a `field_proxy` which is a view type referencing the result. Which dangles after the `return`. Solution: - Add lifetimebound annotation to `operator[]` so that clang's `-Wreturn-stack-address` fires in this case.
bdeane-intel
approved these changes
Feb 5, 2026
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
2 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Problem:
operator[]on a (non-const)write_specreturns afield_proxyso that assignment works. This means that code like this is a pitfall:This code returns a
field_proxywhich is a view type referencing the result. Which dangles after thereturn.Solution:
operator[]so that clang's-Wreturn-stack-addressfires in this case.