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

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[Motions 2026 03 lwg 1] P4145R0 C++ Standard Library Ready Issues#8926
tkoeppe merged 44 commits intomainfrom
motions-2026-03-lwg-1

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@burblebee burblebee commented Apr 7, 2026 •
edited by tkoeppe
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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
Also fixes cplusplus/nbballot#817
Also fixes cplusplus/nbballot#815

Notes:

  • LWG4474: See FIXMEs for concerns about the wording.

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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 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
frederick-vs-ja
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Comment thread source/support.tex Outdated
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jwakely commented Apr 9, 2026

The fourth commit in the series (fd289eb) says "CWG" instead of "LWG" in the commit log.

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I added a few minor comments but everything looks correct. Nice work, Dawn!

@eisenwave eisenwave added this to the post-2026-03 milestone Apr 12, 2026
@tkoeppe tkoeppe force-pushed the motions-2026-03-lwg-1 branch 2 times, most recently from 7014982 to 824dc70 Compare April 12, 2026 16:24
burblebee added 14 commits April 12, 2026 18:17
@burblebee @tkoeppe
LWG2414 Member function reentrancy should be implementation-defined
2ea7dbc
@burblebee @tkoeppe
LWG2746 Inconsistency between requirements for emplace between option…
5ea831b 
…al and variant
@burblebee @tkoeppe
LWG3504 condition_variable::wait_for is overspecified
0d37df0
@burblebee @tkoeppe
LWG3599 The const overload of lazy_split_view::begin should be constr…
b58214b 
…ained by const Pattern
@burblebee @tkoeppe
LWG4290 Missing Mandates clauses on is_sufficiently_aligned
612c845
@burblebee @tkoeppe
LWG4453 atomic_ref<cv T>::required_alignment should be the same as for T
346d301 
Editorial note:
* [atomics.ref.ops]p3 Added "," to match wording added in p1.
@burblebee @tkoeppe
LWG4454 assert should forbid co_await and co_yield
b9add07 
Fixes NB GB 05-129 (C++26 CD).
@burblebee @tkoeppe
LWG4469 Names of parameters of addressable function shall remain unsp…
e1234bc 
…ecified
@burblebee @tkoeppe
LWG4472 std::atomic_ref<const T> can be constructed from temporaries
7a18690
@burblebee @tkoeppe
LWG4486 integral-constant-like and constexpr-wrapper-like exposition-…
b4abee9 
…only concept duplication

Fixes NB US 151-242 (C++26 CD).
@burblebee @tkoeppe
LWG4492 std::generate and std::ranges::generate wording is unclear fo…
6923184 
…r parallel algorithms
@burblebee @tkoeppe
LWG4496 Precedes vs Reachable in [meta.reflection]
2e5143b
@burblebee @tkoeppe
LWG4499 flat_set::insert_range specification may be problematic
1c73ec4
@burblebee @tkoeppe
LWG4510 Ambiguity of std::ranges::advance and std::ranges::next when …
cc66a29 
…the difference type is also a sentinel type
burblebee added 25 commits April 12, 2026 18:17
@burblebee @tkoeppe
LWG4090 Underspecified use of locale facets for locale-dependent std:…
d1705f9 
…:format
@burblebee @tkoeppe
LWG4130 Preconditions for std::launder might be overly strict
d67ab97
@burblebee @tkoeppe
LWG4259 P1148R0 changed the return values of searching functions of s…
f700f35 
…td::basic_string on some platforms

Editorial note:
* [string.find] Use braces in complex if statement.
@burblebee @tkoeppe
LWG4324 unique_ptr<void>::operator* is not SFINAE-friendly
ebffd32
@burblebee @tkoeppe
LWG4378 Inconsistency between std::basic_string's data() and operator…
2d3f1b4 
…[] specification
@burblebee @tkoeppe
LWG4457 freestanding for stable_sort, stable_partition and inplace_merge
dbd9c63 
Fixes NB US 157-255 (C++26 CD).
@burblebee @tkoeppe
LWG4460 Missing Throws: for last variant constructor
b4780d5
@burblebee @tkoeppe
LWG4467 hive::splice can throw bad_alloc
0aed523
@burblebee @tkoeppe
LWG4468 [const.wrap.class] "operator decltype(auto)" is ill-formed
f2ceb54
@burblebee @tkoeppe
LWG4474 "round_to_nearest" rounding mode is unclear
d74efc4
@burblebee @tkoeppe
LWG4477 Placement operator delete should be constexpr
ba3eb6e
@burblebee @tkoeppe
LWG4480 <stdatomic.h> should provide ATOMIC_CHAR8_T_LOCK_FREE
658ef11
@burblebee @tkoeppe
LWG4481 Disallow chrono::duration<const T, P>
34bedfa
@burblebee @tkoeppe
LWG4483 Multidimensional arrays are not supported by meta::reflect_co…
1819377 
…nstant_array and related functions
@burblebee @tkoeppe
LWG4491 Rename submdspan_extents and submdspan_canonicalize_slices
063e722 
Fixes NB US 152-243, PL 008 (C++26 CD).
@burblebee @tkoeppe
LWG4493 Specification for some functions of bit reference types seems…
b87220c 
… missing
@burblebee @tkoeppe
LWG4500 constant_wrapper wording problems
518f4c2
@burblebee @tkoeppe
LWG4514 Missing absolute value of init in vector_two_norm and matrix_…
661ee8a 
…frob_norm
@burblebee @tkoeppe
LWG4517 data_member_spec should throw for cv-qualified unnamed bit-fi…
061e643 
…elds
@burblebee @tkoeppe
LWG4522 Clarify that std::format transcodes for std::wformat_strings
add4df6
@burblebee @tkoeppe
LWG4523 constant_wrapper should assign to value
be29bdf
@burblebee @tkoeppe
LWG4525 task's final_suspend should move the result
1bbe751
@burblebee @tkoeppe
LWG4527 await_transform needs to use as_awaitable
79a781c
@burblebee @tkoeppe
LWG4528 task needs get_completion_signatures()
a76d1f2
@burblebee @tkoeppe
LWG4529 task::promise_type::await_transform declaration and definitio…
a3bbccb 
…n mismatch
@tkoeppe tkoeppe force-pushed the motions-2026-03-lwg-1 branch from 824dc70 to a3bbccb Compare April 12, 2026 17:18
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Comment thread source/meta.tex
then \tcode{options.name} does not contain a value; and
\item
if \tcode{options.name} does not contain a value, then
\tcode{is_const(type) || is_volatile(type)} is \tcode{false}; and
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We're picking up a lot of "; and"s here, but that's what the paper says.

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tkoeppe commented Apr 12, 2026

The fourth commit in the series (fd289eb) says "CWG" instead of "LWG" in the commit log.

Fixed.

@tkoeppe tkoeppe merged commit cc902d3 into main Apr 12, 2026
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@eisenwave eisenwave mentioned this pull request Apr 13, 2026
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[2026-03 LWG Motion 1] P4145R0 C++ Standard Library Ready Issues

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@burblebee @jensmaurer @jwakely @tkoeppe @eisenwave @frederick-vs-ja