Landing: 7249bc4aacc4
Project / Subsystem
gcc / libstdc++
Date
2026-08-21
Author
Patrick Palka
Commit
7249bc4aacc443faeb054d082d25e5d5cb819df9
Source
github
Perf win
No
Breaking
No
All attributes
- project
- gcc
- subsystem
- libstdc++
- patch_id
- —
- commit_hash
- 7249bc4aacc443faeb054d082d25e5d5cb819df9
- source_type
- github
- headline
- libstdc++: Implement LWG 3749 changes to common_iterator
- tldr
- Updates common_iterator to conform to LWG 3749, ensuring correct iterator category handling.
- author
- Patrick Palka
- outcome
- committed
- performance_win
- false
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • libstdc++
- • iterator
- • C++
- • standard library
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-08-21T00:00:00.000Z
This change updates libstdc++‘s common_iterator to align with the C++ standard library’s LWG 3749 resolution. It modifies iterator_traits for common_iterator to correctly determine the iterator category, ensuring compatibility and proper behavior when dealing with different iterator and sentinel types. The changes involve adding a new helper, __detail::__common_iterator_iter_cat, and updating the iterator_traits definition.