Skip to content

[Motions 2026 03 lwg 1] P4145R0 C++ Standard Library Ready Issues#8926

Open
burblebee wants to merge 44 commits intomainfrom
motions-2026-03-lwg-1
Open

[Motions 2026 03 lwg 1] P4145R0 C++ Standard Library Ready Issues#8926
burblebee wants to merge 44 commits intomainfrom
motions-2026-03-lwg-1

Conversation

@burblebee
Copy link
Copy Markdown
Contributor

@burblebee burblebee commented Apr 7, 2026 •
edited by jensmaurer
Loading

Fixes #8835.

Also fixes cplusplus/nbballot#708
Also fixes cplusplus/nbballot#814
Also fixes cplusplus/nbballot#879
Also fixes cplusplus/nbballot#855
Also fixes cplusplus/nbballot#830

Notes:

  • LWG4474: See FIXMEs for concerns about the wording.

@jensmaurer
Copy link
Copy Markdown
Member

jensmaurer commented Apr 7, 2026

I have added "fixes cplusplus/nbballot" links in the initial comment of this pull request. It would be good to amend the corresponding commits with our usual "Fixes NB ... (C++26 CD)." text (examples all over "git log").

@burblebee burblebee force-pushed the motions-2026-03-lwg-1 branch from c3db190 to 1ec13a4 Compare April 7, 2026 13:21
@burblebee burblebee marked this pull request as ready for review April 7, 2026 13:21
@burblebee burblebee marked this pull request as draft April 7, 2026 13:47
burblebee added 20 commits April 7, 2026 06:53
@burblebee
LWG4454 assert should forbid co_await and co_yield
e8dfb74 
Fixes NB GB 05-129 (C++26 CD).
@burblebee
LWG4469 Names of parameters of addressable function shall remain unsp…
c4a7293 
…ecified
@burblebee
LWG4472 std::atomic_ref<const T> can be constructed from temporaries
b5910b5
@burblebee
LWG4486 integral-constant-like and constexpr-wrapper-like exposition-…
fe6d73c 
…only concept duplication

Fixes NB US 151-242 (C++26 CD).
@burblebee
LWG4492 std::generate and std::ranges::generate wording is unclear fo…
6662593 
…r parallel algorithms
@burblebee
LWG4496 Precedes vs Reachable in [meta.reflection]
32bf976
@burblebee
LWG4499 flat_set::insert_range specification may be problematic
a8c8631
@burblebee
LWG4510 Ambiguity of std::ranges::advance and std::ranges::next when …
ecf1b99 
…the difference type is also a sentinel type
@burblebee
LWG4511 Inconsistency between the deduction guide of std::mdspan taki…
cc98777 
…ng (data_handle_type, mapping_type, accessor_type) and the corresponding constructor
@burblebee
LWG4512 The system_encoded_string() and generic_system_encoded_string…
2123003 
…() member functions of std::filesystem::path are misnamed

Fixes NB US 189-304 (C++26 CD).
@burblebee
LWG4535 Disallow user specialization of <simd> templates
cd9953e 
Fixes NB US 176-280 (C++26 CD).
@burblebee
LWG4536 Type traits have inconsistent interactions with immediate fun…
7fed466 
…ctions
@burblebee
LWG3831 Two-digit formatting of negative year is ambiguous
a102476 
[tab:time.format.spec],[tab:time.parse.spec] Fixed wording and formatting in examples
@burblebee
LWG4090 Underspecified use of locale facets for locale-dependent std:…
3cdb19b 
…:format
@burblebee
LWG4130 Preconditions for std::launder might be overly strict
865861d
@burblebee
LWG4259 P1148R0 changed the return values of searching functions of s…
bdffae9 
…td::basic_string on some platforms
@burblebee
LWG4324 unique_ptr<void>::operator* is not SFINAE-friendly
9e936ca
@burblebee
LWG4378 Inconsistency between std::basic_string's data() and operator…
074f180 
…[] specification
@burblebee
LWG4457 freestanding for stable_sort, stable_partition and inplace_merge
eba8f61 
Fixes NB US 157-255 (C++26 CD).
@burblebee
LWG4460 Missing Throws: for last variant constructor
c4bab84
burblebee added 18 commits April 7, 2026 06:55
@burblebee
LWG4467 hive::splice can throw bad_alloc
7138a1d
@burblebee
LWG4468 [const.wrap.class] "operator decltype(auto)" is ill-formed
a675875
@burblebee
LWG4474 "round_to_nearest" rounding mode is unclear
bc2c669
@burblebee
LWG4477 Placement operator delete should be constexpr
6c9af3d
@burblebee
LWG4480 <stdatomic.h> should provide ATOMIC_CHAR8_T_LOCK_FREE
edc506e
@burblebee
LWG4481 Disallow chrono::duration<const T, P>
7bcf512
@burblebee
LWG4483 Multidimensional arrays are not supported by meta::reflect_co…
6da1031 
…nstant_array and related functions
@burblebee
LWG4491 Rename submdspan_extents and submdspan_canonicalize_slices
ddefdcd 
Fixes NB US 152-243, PL-008 (C++26 CD).
@burblebee
LWG4493 Specification for some functions of bit reference types seems…
ab81391 
… missing
@burblebee
LWG4500 constant_wrapper wording problems
907d064
@burblebee
LWG4514 Missing absolute value of init in vector_two_norm and matrix_…
7b4c8c9 
…frob_norm
@burblebee
LWG4517 data_member_spec should throw for cv-qualified unnamed bit-fi…
7dbbd7e 
…elds
@burblebee
LWG4522 Clarify that std::format transcodes for std::wformat_strings
4279714
@burblebee
LWG4523 constant_wrapper should assign to value
6e26db0
@burblebee
LWG4525 task's final_suspend should move the result
30a71cc
@burblebee
LWG4527 await_transform needs to use as_awaitable
8a67cca
@burblebee
LWG4528 task needs get_completion_signatures()
0f900e8
@burblebee
LWG4529 task::promise_type::await_transform declaration and definitio…
076fc37 
…n mismatch
@burblebee burblebee force-pushed the motions-2026-03-lwg-1 branch from 1ec13a4 to 076fc37 Compare April 7, 2026 13:56
@burblebee burblebee marked this pull request as ready for review April 7, 2026 13:58
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment

Reviewers

No reviews

Assignees

No one assigned

Labels

None yet

Projects

None yet

Milestone

No milestone

Development

Successfully merging this pull request may close these issues.

[2026-03 LWG Motion 1] P4145R0 C++ Standard Library Ready Issues

2 participants

@burblebee @jensmaurer