P0843R14 `<inplace_vector>`
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Description
WG21-P0843R14 <inplace_vector>
WG21-P3981R2 Better Return Types In inplace_vector And exception_ptr_cast() (obviously, only half of this paper applies here)
WG21-P4022R0 Remove inplace_vector::try_append_range
LWG-4122 Ill-formed operator<=> can cause hard error when instantiating std::inplace_vector
LWG-4147 Precondition on inplace_vector::emplace
LWG-4151 Precondition of inplace_vector::swap
LWG-4396 Improve inplace_vector(from_range_t, R&& rg)
This was also patched by the Core paper WG21-P3074R7 "Trivial unions".
Feature-test macros (in WG21-N5046; from cplusplus/draft#8898 and cplusplus/draft#7680):
#define __cpp_lib_inplace_vector 202603L
#define __cpp_lib_constexpr_inplace_vector 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 reviewing WG21-P0843R14 and the other listed papers, including the cited LWG issues and WG21-P3074R7. The issue names no implementation files or tests, and notes that PRs for C++26 features are not yet being accepted; completion would require implementing the applicable specification and feature-test macros when work is opened.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- cpp
- Domain
- devtools
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 20/100