P0447R28 `<hive>`
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Description
WG21-P0447R28 <hive>
WG21-P3923R0 Additional NB Comment Resolutions For Kona 2025 (sections 2.2, 2.3, 2.4, 2.5)
LWG-4233 The helper lambda of std::erase for hive should specify return type as bool
LWG-4234 Including <hive> doesn't provide std::begin/end
LWG-4318 Have hive::erase_if reevaluate end() to avoid UB
LWG-4379 hive::reserve() needs Throws: element adjusted to match block min/max considerations
LWG-4467 hive::splice can throw bad_alloc
LWG-4554 Remove undefined behavior from hive for invalid limits
Feature-test macro:
#define __cpp_lib_hive 202502L
My VS-PR-738409 taught the IDE about this new extensionless header.
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
Start by reading WG21-P0447R28 and the listed LWG issues and NB comment resolutions to understand the required std::hive behavior. No source files or tests are named in the issue; completion would require implementing the C++26 feature, addressing the listed resolutions, and providing the __cpp_lib_hive 202502L feature-test macro. Note that the issue says PRs are not yet being accepted.
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
- Mostly clear
- Newbie friendliness
- 15/100