P3372R3 `constexpr` Containers And Adaptors
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cxx26
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Description
WG21-P3372R3 constexpr Containers And Adaptors
LWG-4291 explicit map(const Allocator&) should be constexpr
LWG-4292 Unordered container local iterators should be constexpr iterators
We'll need to find a solution for:
- #5314
Feature-test macros:
#define __cpp_lib_constexpr_deque 202502L
#define __cpp_lib_constexpr_flat_map 202502L
#define __cpp_lib_constexpr_flat_set 202502L
#define __cpp_lib_constexpr_forward_list 202502L
#define __cpp_lib_constexpr_list 202502L
#define __cpp_lib_constexpr_map 202502L
#define __cpp_lib_constexpr_queue 202502L
#define __cpp_lib_constexpr_set 202502L
#define __cpp_lib_constexpr_stack 202502L
#define __cpp_lib_constexpr_unordered_map 202502L
#define __cpp_lib_constexpr_unordered_set 202502L
Note: We are not yet accepting PRs for C++26 features.
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Read WG21-P3372R3 and the related LWG-4291 and LWG-4292 references first. The issue names no files, tests, or implementation entry points, and notes that PRs for C++26 features are not yet being accepted; scope and completion criteria therefore require maintainer guidance.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- cpp
- Domain
- backend
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 15/100