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

Merged

tkoeppe merged 44 commits intomainfrom

motions-2026-03-lwg-1

Apr 12, 2026

Commits on Apr 12, 2026

LWG2414 Member function reentrancy should be implementation-defined

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LWG2746 Inconsistency between requirements for emplace between optional and variant

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LWG3504 condition_variable::wait_for is overspecified

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LWG3599 The const overload of lazy_split_view::begin should be constrained by const Pattern

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LWG4290 Missing Mandates clauses on is_sufficiently_aligned

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LWG4453 atomic_ref<cv T>::required_alignment should be the same as for T

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LWG4454 assert should forbid co_await and co_yield

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LWG4469 Names of parameters of addressable function shall remain unspecified

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LWG4472 std::atomic_ref<const T> can be constructed from temporaries

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LWG4486 integral-constant-like and constexpr-wrapper-like exposition-only concept duplication

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LWG4492 std::generate and std::ranges::generate wording is unclear for parallel algorithms

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LWG4496 Precedes vs Reachable in [meta.reflection]

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LWG4499 flat_set::insert_range specification may be problematic

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LWG4510 Ambiguity of std::ranges::advance and std::ranges::next when the difference type is also a sentinel type

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LWG4511 Inconsistency between the deduction guide of std::mdspan taking (data_handle_type, mapping_type, accessor_type) and the corresponding constructor

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LWG4512 The system_encoded_string() and generic_system_encoded_string() member functions of std::filesystem::path are misnamed

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LWG4535 Disallow user specialization of <simd> templates

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LWG4536 Type traits have inconsistent interactions with immediate functions

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LWG3831 Two-digit formatting of negative year is ambiguous

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LWG4090 Underspecified use of locale facets for locale-dependent std::format

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LWG4130 Preconditions for std::launder might be overly strict

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LWG4259 P1148R0 changed the return values of searching functions of std::basic_string on some platforms

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LWG4324 unique_ptr<void>::operator* is not SFINAE-friendly

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LWG4378 Inconsistency between std::basic_string's data() and operator[] specification

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LWG4457 freestanding for stable_sort, stable_partition and inplace_merge

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LWG4460 Missing Throws: for last variant constructor

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LWG4467 hive::splice can throw bad_alloc

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LWG4468 [const.wrap.class] "operator decltype(auto)" is ill-formed

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LWG4474 "round_to_nearest" rounding mode is unclear

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LWG4477 Placement operator delete should be constexpr

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LWG4480 <stdatomic.h> should provide ATOMIC_CHAR8_T_LOCK_FREE

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LWG4481 Disallow chrono::duration<const T, P>

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LWG4483 Multidimensional arrays are not supported by meta::reflect_constant_array and related functions

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LWG4491 Rename submdspan_extents and submdspan_canonicalize_slices

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LWG4493 Specification for some functions of bit reference types seems missing

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LWG4500 constant_wrapper wording problems

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LWG4514 Missing absolute value of init in vector_two_norm and matrix_frob_norm

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LWG4517 data_member_spec should throw for cv-qualified unnamed bit-fields

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LWG4522 Clarify that std::format transcodes for std::wformat_strings

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LWG4523 constant_wrapper should assign to value

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LWG4525 task's final_suspend should move the result

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LWG4527 await_transform needs to use as_awaitable

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LWG4528 task needs get_completion_signatures()

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LWG4529 task::promise_type::await_transform declaration and definition mismatch

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