C++ Standard Library Issues List (Revision D126)

Index by Section

Reference ISO/IEC IS 14882:2024(E)

This document is the Index by Section for the Library Active Issues List, Library Defect Reports and Accepted Issues, and Library Closed Issues List.

Index by Section

(view only non-Ready open issues)

Revised 2026-03-13 at 14:40:05 UTC

Section 16 (2 issues)

Issue	Status	Section	Title	Proposed Resolution	Priority	Duplicates
4469⁽ⁱ⁾	Ready	16.4.5.2.1 [namespace.std]	Names of parameters of addressable function shall remain unspecified	Yes	2
2414⁽ⁱ⁾	Ready	16.4.6.9 [reentrancy]	Member function reentrancy should be implementation-defined	Yes	3

Section 17 (3 issues)

(view only non-Ready open issues)

Issue	Status	Section	Title	Proposed Resolution	Priority	Duplicates
4474⁽ⁱ⁾	Tentatively Ready	17.3.4 [round.style]	"`round_to_nearest`" rounding mode is unclear	Yes
4477⁽ⁱ⁾	Tentatively Ready	17.6.3.4 [new.delete.placement]	Placement `operator delete` should be constexpr	Yes
4130⁽ⁱ⁾	Tentatively Ready	17.6.5 [ptr.launder]	Preconditions for `std::launder` might be overly strict	Yes	3

Section 19 (1 issues)

Issue	Status	Section	Title	Proposed Resolution	Priority	Duplicates
4454⁽ⁱ⁾	Ready	19.3.3 [assertions.assert]	`assert` should forbid `co_await` and `co_yield`	Yes	1

Section 20 (2 issues)

(view only non-Ready open issues)

Issue	Status	Section	Title	Proposed Resolution	Priority	Duplicates
4290⁽ⁱ⁾	Ready	20.2.5 [ptr.align]	Missing Mandates clauses on `is_sufficiently_aligned`	Yes	2
4324⁽ⁱ⁾	Tentatively Ready	20.3.1.3.5 [unique.ptr.single.observers]	`unique_ptr<void>::operator*` is not SFINAE-friendly	Yes	3

Section 21 (8 issues)

(view only non-Ready open issues)

Issue	Status	Section	Title	Proposed Resolution	Priority	Duplicates
4523⁽ⁱ⁾	Tentatively Ready	21.3.5 [const.wrap.class]	`constant_wrapper` should assign to `value`	Yes
4500⁽ⁱ⁾	Tentatively Ready	21.3.5 [const.wrap.class]	`constant_wrapper` wording problems	Yes
4468⁽ⁱ⁾	Tentatively Ready	21.3.5 [const.wrap.class]	§[const.wrap.class] "`operator decltype(auto)`" is ill-formed	Yes
4534⁽ⁱ⁾	Ready	21.3.6.4 [meta.unary.prop]	`is_consteval_only` preconditions are too weak	Yes
4536⁽ⁱ⁾	Ready	21.3.6.4 [meta.unary.prop]	Type traits have inconsistent interactions with immediate functions	Yes
4496⁽ⁱ⁾	Ready	21.4 [meta.reflection]	Precedes vs Reachable in [meta.reflection]	Yes	2
4483⁽ⁱ⁾	Tentatively Ready	21.4.3 [meta.define.static]	Multidimensional arrays are not supported by `meta::reflect_constant_array` and related functions	Yes	2
4517⁽ⁱ⁾	Tentatively Ready	21.4.16 [meta.reflection.define.aggregate]	`data_member_spec` should throw for cv-qualified unnamed bit-fields	Yes

Section 22 (3 issues)

(view only non-Ready open issues)

Issue	Status	Section	Title	Proposed Resolution	Priority	Duplicates
2746⁽ⁱ⁾	Ready	22.5.3.4 [optional.assign]	Inconsistency between requirements for `emplace` between `optional` and `variant`	Yes	3
4460⁽ⁱ⁾	Tentatively Ready	22.6.3.2 [variant.ctor]	Missing Throws: for last `variant` constructor	Yes
4493⁽ⁱ⁾	Tentatively Ready	22.9.2.1 [template.bitset.general]	Specification for some functions of bit reference types seems missing	Yes

Section 23 (5 issues)

(view only non-Ready open issues)

Issue	Status	Section	Title	Proposed Resolution	Priority	Duplicates
4467⁽ⁱ⁾	Tentatively Ready	23.3.9.5 [hive.operations]	`hive::splice` can throw `bad_alloc`	Yes
4499⁽ⁱ⁾	Ready	23.6.11.5 [flat.set.modifiers]	`flat_set::insert_range` specification may be problematic	Yes	2
4486⁽ⁱ⁾	Ready	23.7.2.1 [span.syn]	`integral-constant-like` and `constexpr-wrapper-like` exposition-only concept duplication	Yes
4511⁽ⁱ⁾	Ready	23.7.3.6.1 [mdspan.mdspan.overview]	Inconsistency between the deduction guide of `std::mdspan` taking `(data_handle_type, mapping_type, accessor_type)` and the corresponding constructor	Yes
4491⁽ⁱ⁾	Tentatively Ready	23.7.3.7 [mdspan.sub]	Rename `submdspan_extents` and `submdspan_canonicalize_slices`	Yes

Section 24 (1 issues)

Issue	Status	Section	Title	Proposed Resolution	Priority	Duplicates
4510⁽ⁱ⁾	Ready	24.4.4.2 [range.iter.op.advance]	Ambiguity of `std::ranges::advance` and `std::ranges::next` when the difference type is also a sentinel type	Yes	3

Section 25 (1 issues)

Issue	Status	Section	Title	Proposed Resolution	Priority	Duplicates
3599⁽ⁱ⁾	Ready	25.7.16.2 [range.lazy.split.view]	The `const` overload of `lazy_split_view::begin` should be constrained by `const Pattern`	Yes	3

Section 26 (2 issues)

(view only non-Ready open issues)

Issue	Status	Section	Title	Proposed Resolution	Priority	Duplicates
4457⁽ⁱ⁾	Tentatively Ready	26.4 [algorithm.syn]	freestanding for `stable_sort`, `stable_partition` and `inplace_merge`	Yes
4492⁽ⁱ⁾	Ready	26.7.7 [alg.generate]	`std::generate` and `std::ranges::generate` wording is unclear for parallel algorithms	Yes	2

Section 27 (2 issues)

(view only non-Ready open issues)

Issue	Status	Section	Title	Proposed Resolution	Priority	Duplicates
4378⁽ⁱ⁾	Tentatively Ready	27.4.3.6 [string.access]	Inconsistency between `std::basic_string`'s `data()` and `operator[]` specification	Yes	4
4259⁽ⁱ⁾	Tentatively Ready	27.4.3.8.2 [string.find]	P1148R0 changed the return values of searching functions of `std::basic_string` on some platforms	Yes	3

Section 28 (2 issues)

(view only non-Ready open issues)

Issue	Status	Section	Title	Proposed Resolution	Priority	Duplicates
4522⁽ⁱ⁾	Tentatively Ready	28.5.2.2 [format.string.std]	Clarify that `std::format` transcodes for `std::wformat_strings`	Yes
4090⁽ⁱ⁾	Tentatively Ready	28.5.2.2 [format.string.std]	Underspecified use of locale facets for locale-dependent `std::format`	Yes	3

Section 29 (2 issues)

(view only non-Ready open issues)

Issue	Status	Section	Title	Proposed Resolution	Priority	Duplicates
4514⁽ⁱ⁾	Tentatively Ready	29.9.13.9 [linalg.algs.blas1.nrm2]	Missing absolute value of `init` in `vector_two_norm` and `matrix_frob_norm`	Yes
4535⁽ⁱ⁾	Ready	29.10.1 [simd.general]	Disallow user specialization of `<simd>` templates	Yes

Section 30 (2 issues)

(view only non-Ready open issues)

Issue	Status	Section	Title	Proposed Resolution	Priority	Duplicates
4481⁽ⁱ⁾	Tentatively Ready	30.5.1 [time.duration.general]	Disallow `chrono::duration<const T, P>`	Yes
3831⁽ⁱ⁾	Tentatively Ready	30.12 [time.format]	Two-digit formatting of negative `year` is ambiguous	Yes	3

Section 31 (1 issues)

Issue	Status	Section	Title	Proposed Resolution	Priority	Duplicates
4512⁽ⁱ⁾	Ready	31.12.6.1 [fs.class.path.general]	The `system_encoded_string()` and `generic_system_encoded_string()` member functions of `std::filesystem::path` are misnamed	Yes

Section 32 (3 issues)

(view only non-Ready open issues)

Issue	Status	Section	Title	Proposed Resolution	Priority	Duplicates
4472⁽ⁱ⁾	Ready	32.5.7 [atomics.ref.generic]	`std::atomic_ref<const T>` can be constructed from temporaries	Yes
4480⁽ⁱ⁾	Tentatively Ready	32.5.12 [stdatomic.h.syn]	`<stdatomic.h>` should provide `ATOMIC_CHAR8_T_LOCK_FREE`	Yes
3504⁽ⁱ⁾	Ready	32.7.4 [thread.condition.condvar]	`condition_variable::wait_for` is overspecified	Yes	3

Section 33 (5 issues)

(view only non-Ready open issues)

Issue	Status	Section	Title	Proposed Resolution	Priority	Duplicates
4528⁽ⁱ⁾	Tentatively Ready	33.13.6.2 [task.class]	`task` needs `get_completion_signatures()`	Yes
4485⁽ⁱ⁾	Tentatively Ready	33.13.6.4 [task.state]	Move specification for `task::stop_token_type`	Yes
4525⁽ⁱ⁾	Tentatively Ready	33.13.6.5 [task.promise]	`task`'s `final_suspend` should `move` the result	Yes
4527⁽ⁱ⁾	Tentatively Ready	33.13.6.5 [task.promise]	`await_transform` needs to use `as_awaitable`	Yes
4529⁽ⁱ⁾	Tentatively Ready	33.13.6.5 [task.promise]	`task::promise_type::await_transform` declaration and definition mismatch	Yes