C++ Standard Library Issues List (Revision D125)

Table of Contents

Reference ISO/IEC IS 14882:2020(E)

This document is the Table of Contents for the Library Active Issues List, Library Defect Reports and Accepted Issues, and Library Closed Issues List, sorted by priority.

Revised 2025-10-12

Priority 1 (8 issues)

Issue Status Section Title Proposed Resolution Priority Duplicates
4015 Open 22.5.3.8 [optional.monadic] LWG 3973 broke const overloads of std::optional monadic operations Yes 1
4308 New 22.5.4.5 [optional.ref.iterators] std::optional<T&>::iterator can't be a contiguous iterator for some T Yes 1
4238 New 29.10.9.4 [simd.mask.unary] simd_mask<complex<double>>::operator+/-/~ return a disabled simd specialization Yes 1
4199 New 33.9.1 [exec.snd.general] constraints on user customizations of standard sender algorithms are incorrectly specified No 1
4248 New 33.9.2 [exec.snd.expos] Late domain-based dispatching of schedule_from and continues_on are flipped Yes 1
4133 New 33.13.1 [exec.as.awaitable] awaitable-receiver's members are potentially throwing No 1
4251 New 99 [indirect.asgn] Move assignment for indirect unnecessarily requires copy construction Yes 1
4206 New 99 [exec.syn] Alias template connect_result_t should be constrained with sender_to Yes 1

Priority 2 (56 issues)

Issue Status Section Title Proposed Resolution Priority Duplicates
4005 New 3.48 [defns.required.behavior] "Required behavior" too narrowly defined No 2
3538 New 16.2 [library.c] §[library.c] C library functions are not addressable No 2
3011 Open 19.3 [assertions] Requirements for assert(E) inconsistent with C No 2
3507 Open 19.6.3.4 [stacktrace.entry.query] P0881R7 ("stacktrace") does not define "actual file name", "actual line number" No 2
4322 New 20.4 [mem.composite.types] Problematic Constraints on incomplete types in indirect and polymorphic Yes 2
2939 Open 21.3.3 [meta.type.synop] Some type-completeness constraints of traits are overspecified Yes 2
3099 Open 21.3.3 [meta.type.synop] is_assignable<Incomplete&, Incomplete&> Yes 2
2153 LEWG 22.2.2 [utility.swap] Narrowing of the non-member swap contract No 2
2829 Open 22.5.3.7 [optional.observe] LWG 2740 leaves behind vacuous words No 2
2833 Open 22.6.3.2 [variant.ctor] Library needs to specify what it means when it declares a function constexpr Yes 2
3215 New 22.6.3.2 [variant.ctor] variant default constructor has vague constexpr requirements No 2
4197 New 22.6.7 [variant.visit] Complexity of std::visit with immediate functions Yes 2
3688 New 22.8.4 [expected.bad] Exception specifications of copy/move member functions of std::bad_expected_access No 2
3891 New 22.8.6.1 [expected.object.general] LWG 3870 breaks std::expected<cv T, E> Yes 2
4026 New 22.8.6.4 [expected.object.assign] Assignment operators of std::expected should propagate triviality Yes 2
4195 New 22.8.6.4 [expected.object.assign] expected<int, int> isn't specified to be trivially assignable Yes 2
3680 New 22.10.17.4.3 [func.wrap.move.ctor] Constructor of move_only_function with empty ref-qualifier is over-constrained Yes 2
2307 LEWG 23 [containers] Should the Standard Library use explicit only when necessary? No 2
4046 New 23.2.7.2 [associative.reqmts.except] Effects of inserting into or erasing from flat container adaptors when an exception is thrown need to be more permissive No 2
4122 New 23.3.16.1 [inplace.vector.overview] Ill-formed operator<=> can cause hard error when instantiating std::inplace_vector Yes 2
4151 New 23.3.16.5 [inplace.vector.modifiers] Precondition of inplace_vector::swap Yes 2
4223 New 23.4.1 [associative.general] Deduction guides for maps are mishandling tuples and references Yes 2
3802 New 23.6.8 [flat.map] flat_foo allocator-extended constructors lack move semantics No 2
3804 New 23.6.8 [flat.map] flat_foo missing some allocator-extended deduction guides No 2
4048 New 23.6.11 [flat.set] Inconsistent preconditions for transparent insertion of std::flat_map/std::flat_set Yes 2
3813 New 23.7.2.2.1 [span.overview] std::span<volatile T, E> is made ill-formed by P2278R4 when T is a normal class type Yes 2
4272 New 23.7.3.4 [mdspan.layout] For rank == 0, layout_stride is atypically convertible Yes 2
2962 Open 24.3.5.3 [input.iterators] Iterators of Containers of move-only types do not model InputIterator Yes 2
3863 New 24.5.3.2 [const.iterators.alias] Is input_iterator guaranteed to have iter_const_reference_t? No 2
4218 New 24.5.3.5 [const.iterators.ops] Constraint recursion in basic_const_iterator's relational operators due to ADL + CWG 2369 Yes 2
4121 New 25.5.7.1 [range.utility.conv.general] ranges::to constructs associative containers via c.emplace(c.end(), *it) Yes 2
3666 New 25.7.14 [range.join] join_view's difference type is too small No 2
3972 New 25.7.15.3 [range.join.with.iterator] Issues with join_with_view::iterator's iter_swap No 2
3797 New 25.7.23.2 [range.elements.view] elements_view insufficiently constrained Yes 2
3777 Open 25.7.33.2 [range.cartesian.view] Common cartesian_product_view produces an invalid range if the first range is input and one of the ranges is empty Yes 2
4226 New 25.7.35 [range.to.input] to_input_view::iterator cannot be compared to its const sentinel Yes 2
3060 New 26.10.8 [exclusive.scan] XXX_scan algorithms are specified to work with move-only T, but are specified to make N copies of T into the destination range No 2
4077 New 26.12.2 [alg.rand.generate] Unclear preconditions of std::ranges::generate_random No 2
4063 New 27.2.4.2 [char.traits.specializations.char] Freestanding std::char_traits<char>::eof depends on non-freestanding EOF No 2
4102 New 27.3.3.2 [string.view.cons] string_view(Iter, Iter) constructor breaks existing code No 2
3082 Open 28.2.3 [charconv.from.chars] from_chars specification regarding floating point rounding is inconsistent Yes 2
3081 Open 28.2.3 [charconv.from.chars] Floating point from_chars API does not distinguish between overflow and underflow Yes 2
3674 New 28.3.3.1.4 [locale.members] Removal of requirement for locale names for construction of locales not explained Yes 2
3644 New 28.5.2.2 [format.string.std] std::format does not define "integer presentation type" Yes 2
3586 New 28.5.2.2 [format.string.std] Formatting character alignment inconsistencies Yes 2
4240 New 28.5.6.3 [format.formattable] The formattable type is not a formattable type Yes 2
3693 New 29.7 [c.math] §[c.math] Can any of float/double/long double overloads be fused into template overloads? No 2
4230 New 29.10.8.4 [simd.complex.access] simd<complex>::real/imag is overconstrained Yes 2
4070 Open 31.12.6.9.2 [fs.path.fmtr.funcs] Transcoding by std::formatter<std::filesystem::path> Yes 2
2708 Open 31.12.12.2 [fs.rec.dir.itr.members] recursive_directory_iterator::recursion_pending() is incorrectly specified Yes 2
3057 Open 31.12.13.4 [fs.op.copy] Correct copy_options handling Yes 2
3288 New 32.5.6 [atomics.wait] atomic<T>::notify_one is unimplementable Yes 2
4143 New 33.7.2 [exec.set.value] execution::set_value/set_error/set_stopped/start should always return void Yes 2
4190 New 33.9.2 [exec.snd.expos] Specification of completion-signatures-for in [exec.snd.expos]/p39 is recursive Yes 2
4215 New 33.12.1 [exec.run.loop] run_loop::finish should be noexcept Yes 2
3444 New 19.1.2 [networking.ts::socket.streambuf.members] [networking.ts] net::basic_socket_streambuf::connect(Args&&...) effects are wrong No 2

Priority 3 (397 issues)

Issue Status Section Title Proposed Resolution Priority Duplicates
3513 New 3.43 [defns.prog.def.type] Fix definition of program-defined based on its uses Yes 3
3669 New 4.1.2 [intro.abstract] std::filesystem operations should be observable behaviour No 3
2506 SG1 6.10.2 [intro.multithread] Underspecification of atomics No 3
3105 New 16 [library] T1 is convertible to T2 No 3
2136 Open 16.3.2 [structure] Postconditions vs. exceptions Yes 3
3556 New 16.3.2.3 [structure.requirements] Specification of when semantic constraints are imposed by use of concepts is unclear No 3
3193 New 16.3.2.4 [structure.specifications] Mandates: and Expects: elements are not defined for types Yes 3
3401 New 16.3.2.4 [structure.specifications] Is "as if by" equivalent to "equivalent to"? No 3
3092 Open 16.3.3.3.3 [bitmask.types] Unclear semantics of enum class bitmask types Yes 3
3977 New 16.3.3.3.3 [bitmask.types] constexpr and noexcept for operators for bitmask types Yes 3
3620 New 16.3.3.3.4.1 [character.seq.general] What are execution character sets and execution wide-character sets (after P2314R4)? No 3
4049 New 16.4.2 [organization] C <foo.h> headers not in freestanding Yes 3
3690 New 16.4.2.2 [contents] std::make_from_tuple etc. should find all tuple-like std::get overloads Yes 3
3240 New 16.4.3.2 [using.headers] Headers declare more than entities No 3
3640 New 16.4.4 [utility.requirements] Clarify which exceptions are propagated Yes 3
4075 SG1 16.4.4 [utility.requirements] Thread stability requirement on constructors and destructors No 3
2146 Open 16.4.4.2 [utility.arg.requirements] Are reference types CopyConstructible/MoveConstructible/CopyAssignable/MoveAssignable/Destructible? No 3
2152 LEWG 16.4.4.3 [swappable.requirements] Instances of standard container types are not swappable Yes 3
4155 New 16.4.4.4 [nullablepointer.requirements] Cpp17NullablePointer should require that some expression can be contextually converted to bool Yes 3
3044 New 16.4.4.6 [allocator.requirements] Strange specification of max_size() for an allocator Yes 3
3157 New 16.4.4.6 [allocator.requirements] Allocator destroy and fancy pointer operations must be non-throwing Yes 3
2461 New 16.4.4.6 [allocator.requirements] Interaction between allocators and container exception safety guarantees No 3
4065 New 16.4.4.6.1 [allocator.requirements.general] Requirements for fancy pointers might be insufficient for self-referential implementation of containers Yes 3
3682 New 16.4.4.6.1 [allocator.requirements.general] A Cpp17Allocator type can't silently ignore an unsupported alignment No 3
4128 New 16.4.4.6.1 [allocator.requirements.general] Allocator requirements should not allow rebinding conversions to be explicit Yes 3
3928 New 16.4.5.2.2 [namespace.posix] Non-top-level namespace posix shouldn't be reserved Yes 3
3550 New 16.4.5.3 [reserved.names] Names reserved by C for standard library not reserved by C++ No 3
4033 New 16.4.5.3.3 [macro.names] §[macro.names] defining macros after importing the standard library Yes 3
3920 New 16.4.5.3.4 [extern.names] Bad footnotes claiming external linkage for entities defined as macros No 3
3142 New 16.4.5.8 [res.on.functions] std::foo<incomplete> should be ill-formed NDR Yes 3
3511 New 16.4.5.9 [res.on.arguments] Clarify global permission to move Yes 3
3429 New 16.4.5.11 [res.on.requirements] "models" should subsume like "satisfies" Yes 3
4100 New 16.4.6.4 [global.functions] Default arguments and signatures of standard library non-member functions Yes 3
2695 New 16.4.6.5 [member.functions] "As if" unclear in [member.functions] No 3
4306 New 16.4.6.5 [member.functions] Interaction between LWG 2259 and Constraints of member functions No 3
2414 Open 16.4.6.9 [reentrancy] Member function reentrancy should be implementation-defined Yes 3
4145 New 16.4.6.10 [res.on.data.races] Unclear how [res.on.data.races] apply to templated functions No 3
4252 New 16.4.6.13 [derivation] Are exposition-only classes considered specified for the purpose of final? Yes 3
3229 New 16.4.6.14 [res.on.exception.handling] §[res.on.exception.handling]#3 cannot apply to types with implicitly declared destructors Yes 3
3854 New 16.4.6.14 [res.on.exception.handling] §[res.on.exception.handling]/3 should not be applied to all standard library types No 3
4182 New 17.2.3 [support.types.nullptr] Definition of NULL is too broad Yes 3
3217 New 17.3.1 [support.limits.general] <memory> and <execution> should define __cpp_lib_parallel_algorithm Yes 3
3931 New 17.3.2 [version.syn] Too many paper bump __cpp_lib_ranges Yes 3
2730 Open 17.3.5 [numeric.limits] numeric_limits primary template definition No 3
3923 New 17.3.5.1 [numeric.limits.general] The specification of numeric_limits doesn't clearly distinguish between implementation requirements and user requirements Yes 3
3922 New 17.3.5.1 [numeric.limits.general] It's unclear whether numeric_limits can be specialized by users Yes 3
3370 New 17.4.1 [cstdint.syn] §[cstdint.syn]p2 and §[headers]p5 are not sufficiently clear No 3
2815 New 17.5 [support.start.term] quick_exit can deadlock Yes 3
3084 New 17.5 [support.start.term] Termination in C++ is unclear No 3
2737 New 17.6.3.2 [new.delete.single] Consider relaxing object size restrictions for single-object allocation functions No 3
3086 New 17.6.3.2 [new.delete.single] Possible problem in §[new.delete.single] Yes 3
2303 New 17.6.3.4 [new.delete.placement] Explicit instantiation of std::vector<UserType> broken? No 3
2508 New 17.6.3.5 [new.delete.dataraces] §[new.delete.dataraces] wording needs to be updated No 3
4130 Open 17.6.5 [ptr.launder] Preconditions for std::launder might be overly strict Yes 3
3624 New 17.7 [support.rtti] Inconsistency of <typeinfo>, <initializer_list>, and <compare> in the standard library Yes 3
2398 Open 17.7.3 [type.info] type_info's destructor shouldn't be required to be virtual Yes 3
4087 SG16 17.9.3 [exception] Standard exception messages have unspecified encoding Yes 3
2453 New 17.11 [support.initlist] §[iterator.range] and now [iterator.container] aren't available via <initializer_list> No 3
3584 New 17.12.3 [cmp.common] Clarify common comparison category conversions Yes 3
3587 New 17.12.4 [cmp.concept] std::three_way_comparable_with<T, U, void> can be satisfied but can't be modeled No 3
3491 New 17.12.6 [cmp.alg] What is a "decayed type"? No 3
3932 New 17.12.6 [cmp.alg] Expression-equivalence is sometimes unimplementable when passing prvalue expressions to comparison CPOs No 3
3653 New 17.13.2 [coroutine.syn] <coroutine> is freestanding, but uses std::hash which is not No 3
3945 New 17.14.2 [cstdarg.syn] §[cstdarg.syn] 'Compatible types' are undefined No 3
3954 New 17.15.1 [support.c.headers.general] Feature-test macros in C headers (<stddef.h> etc.) No 3
3484 New 17.15.7 [support.c.headers.other] Should <stddef.h> declare ::nullptr_t? Yes 3
3799 New 17.15.7 [support.c.headers.other] Should <math.h> provide 3-argument ::hypot overloads? No 3
3895 New 18.3 [concepts.syn] Various relation concepts are missing default values of the second template parameters Yes 3
3608 New 18.4.4 [concept.convertible] convertible_to and temporary-bound references No 3
3459 New 18.4.4 [concept.convertible] Why doesn't std::convertible_to have semantic requirement when To is reference-to-function type? No 3
4165 New 18.4.9 [concept.swappable] Should swapping a built-in array or std::array with itself result in UB? No 3
4156 SG16 19.5.3.2 [syserr.errcat.virtuals] error_category messages have unspecified encoding Yes 3
3019 New 19.5.3.4 [syserr.errcat.derived] Presentation of "program defined classes derived from error_category" [syserr.errcat.derived] unclear and contains mistakes No 3
3053 New 19.5.4.1 [syserr.errcode.overview] Prohibit error_code construction from rvalues of error_category Yes 3
3162 New 19.5.8.2 [syserr.syserr.members] system_error::system_error(error_code ec) not explicit Yes 3
3625 Open 19.6.2 [stacktrace.syn] Should <stacktrace> provide range access function templates? Yes 3
3626 New 19.6.4.1 [stacktrace.basic.overview] Is std::basic_stacktrace required to use contiguous storage? Yes 3
2421 New 20.2.5 [ptr.align] Non-specification of handling zero size in std::align [ptr.align] No 3
3192 New 20.2.8.2 [allocator.uses.construction] §[allocator.uses.construction] functions misbehave for const types Yes 3
3665 New 20.2.9.2 [allocator.traits.types] Is std::allocator_traits<Alloc>::rebind_alloc SFINAE-friendly? No 3
3917 New 20.2.10 [default.allocator] Validity of allocator<void> and possibly polymorphic_allocator<void> should be clarified Yes 3
3916 New 20.2.10 [default.allocator] allocator, polymorphic_allocator, and containers should forbid cv-qualified types No 3
3684 New 20.2.10.2 [allocator.members] std::allocator<T>::allocate_at_least in constant evaluation Yes 3
2262 Open 20.3.1.3 [unique.ptr.single] Requirement for unique_ptr<T>::get_deleter()(p) to be able to destroy the unique_ptr Yes 3
3159 New 20.3.1.3 [unique.ptr.single] §[unique.ptr.single] requirements on deleter may be too strict No 3
3911 New 20.3.1.3.5 [unique.ptr.single.observers] unique_ptr's operator* is missing a mandate Yes 3
2594 New 20.3.2.2 [util.smartptr.shared] Contradicting definition of empty shared_ptr on shared_ptr(nullptr, d) Yes 3
2906 New 20.3.2.2.2 [util.smartptr.shared.const] There is no ability to supply an allocator for the control block when constructing a shared_ptr from a unique_ptr No 3
3210 New 20.3.2.2.7 [util.smartptr.shared.create] allocate_shared is inconsistent about removing const from the pointer passed to allocator construct and destroy Yes 3
3637 New 20.5.2 [mem.res.class] pmr::memory_resource::do_allocate needs clarification No 3
3634 New 20.5.4 [mem.res.global] When are static-duration memory_resource objects destroyed? No 3
2848 New 20.5.5.2 [mem.res.pool.options] Pass-through threshold for pool allocator No 3
2452 Core 21 [meta] is_constructible, etc. and default arguments No 3
2290 Open 21 [meta] Top-level "SFINAE"-based constraints should get a separate definition in Clause 17 Yes 3
2845 New 21.3.2 [meta.rqmts] enable_if, result_of, common_type and aligned_storage do not meet the definition of TransformationTrait No 3
3697 New 21.3.6.4 [meta.unary.prop] Preconditions of reference_constructs_from_temporary/reference_converts_from_temporary seem wrong Yes 3
2116 Open 21.3.6.4 [meta.unary.prop] is_nothrow_constructible and destructors No 3
2827 New 21.3.6.4 [meta.unary.prop] is_trivially_constructible and non-trivial destructors No 3
2358 Open 21.3.6.4 [meta.unary.prop] Apparently-bogus definition of is_empty type trait Yes 3
3929 New 21.3.6.4 [meta.unary.prop] Preconditions for type traits should be Mandates Yes 3
2496 New 21.3.6.4 [meta.unary.prop] Certain hard-to-avoid errors not in the immediate context are not allowed to be triggered by the evaluation of type traits No 3
2077 Open 21.3.6.4 [meta.unary.prop] Further incomplete constraints for type traits No 3
3174 New 21.3.8 [meta.rel] Precondition on is_convertible is too strong Yes 3
3400 New 21.3.8 [meta.rel] Does is_nothrow_convertible consider destruction of the destination type? No 3
3205 New 21.3.9.7 [meta.trans.other] decay_t in the new common_type fallback should be remove_cvref_t Yes 3
4298 New 21.4.12 [meta.reflection.extract] §[meta.reflection.extract] Malformed "F noexcept" type Yes 3
2599 New 22.2.6 [declval] Library incomplete type permission phrase is unclear No 3
3342 New 22.3.2 [pairs.pair] Library wording uses "initializes x with y", which is underspecified No 3
2289 Open 22.3.2 [pairs.pair] constexpr guarantees of defaulted functions still insufficient No 3
2766 New 22.3.3 [pairs.spec] Swapping non-swappable types Yes 3
3166 New 22.3.4 [pair.astuple] No such descriptive element as Value: No 3
3378 New 22.4.2 [tuple.syn] tuple_size_v/tuple_element_t should be available when tuple_size/tuple_element are Yes 3
2528 New 22.4.4.2 [tuple.cnstr] Order of std::tuple construction unspecified No 3
3583 New 22.4.4.2 [tuple.cnstr] Clarify if/when short circuiting applies to conditions in Constraints: elements No 3
4040 New 22.4.7 [tuple.helper] Contradictory specification of std::tuple_size No 3
2472 New 22.4.9 [tuple.rel] Heterogeneous comparisons in the standard library can result in ambiguities No 3
3882 New 22.4.9 [tuple.rel] tuple relational operators have confused friendships Yes 3
2990 Open 22.5.3 [optional.optional] optional::value_type is not always a value type Yes 3
2811 New 22.5.3.2 [optional.ctor] "Selected constructor" wording is incorrect for optional/variant/any Yes 3
2746 New 22.5.3.4 [optional.assign] Inconsistency between requirements for emplace between optional and variant Yes 3
3424 New 22.5.3.7 [optional.observe] optional::value_or should never return a cv-qualified type Yes 3
3613 New 22.5.5 [optional.nullopt] Specify that nullopt_t is copyable Yes 3
3627 New 22.5.10 [optional.specalg] Inconsistent specifications for std::make_optional overloads Yes 3
2881 New 22.6.3 [variant.variant] Adopt section III of P0308R0 No 3
3069 New 22.6.3.4 [variant.assign] Move assigning variant's subobject corrupts data Yes 3
3991 New 22.6.3.4 [variant.assign] variant's move assignment should not be guaranteed to produce a valueless by exception state Yes 3
3416 New 22.7.4 [any.class] The Throws: specification of std::any does not mention allocation No 3
3423 New 22.7.5 [any.nonmembers] std::any_cast should never return a cv-qualified type Yes 3
4187 New 22.9.2 [template.bitset] bitset::reference should be const-assignable Yes 3
2348 Open 22.9.2 [template.bitset] charT('1') is not the wide equivalent of '1' Yes 3
4007 New 22.10.4 [func.require] Mystic prohibition of calling a volatile-qualified perfect forwarding call wrapper Yes 3
3046 New 22.10.6 [refwrap] Do not require reference_wrapper to support non-referenceable function types Yes 3
2547 New 22.10.8 [comparisons] Container requirements (and other library text) should say "strict total order", not just "total order" No 3
2491 New 22.10.8 [comparisons] std::less<T*> in constant expression Yes 3
3493 New 22.10.17.3.2 [func.wrap.func.con] The constructor of std::function taking an F is missing a constraint Yes 3
3642 New 22.10.17.4.3 [func.wrap.move.ctor] move_only_function assignment operators seem to be defined suboptimal Yes 3
4127 New 22.10.18.3 [func.search.bm] The Standard Library should not use predicates of the form pred(*i) != false Yes 3
3512 New 22.10.19 [unord.hash] Incorrect exception safety guarantee for unordered containers No 3
3059 New 23.2 [container.requirements] Wrong requirements for map-like associative container assignment? No 3
1521 Open 23.2.2 [container.requirements.general] Requirements on internal pointer representations in containers Yes 3
2321 Open 23.2.2 [container.requirements.general] Moving containers should (usually) be required to preserve iterators Yes 3
3297 New 23.2.4 [sequence.reqmts] Useless sequence container requirement Yes 3
2705 New 23.2.4 [sequence.reqmts] Questionable precondition on Sequence containers a.assign(n, t) Yes 3
2206 Open 23.2.4 [sequence.reqmts] Inaccuracy in initializer_list constructor requirements Yes 3
4159 New 23.2.5 [container.node] Uses-allocator construction mechanisms should be opted out for node handles Yes 3
3438 New 23.2.5.1 [container.node.overview] §[container.node.overview] missing multiset/map cases No 3
2227 Open 23.2.7 [associative.reqmts] Stateful comparison objects in associative containers No 3
2844 Open 23.2.7 [associative.reqmts] Stability of a_uniq.insert(i, j) No 3
2362 New 23.2.7 [associative.reqmts] unique, associative emplace() should not move/copy the mapped_type constructor arguments when no insertion happens No 3
3227 New 23.2.7 [associative.reqmts] Ambiguity issue for extract in ordered and unordered associative containers Yes 3
2215 Open 23.2.7 [associative.reqmts] (unordered) associative container functors should be CopyConstructible Yes 3
4132 New 23.2.7.1 [associative.reqmts.general] Throws specifications need to include boolean-testable operations Yes 3
3577 New 23.2.7.1 [associative.reqmts.general] Merging an (unordered) associative container with itself No 3
3691 New 23.2.7.1 [associative.reqmts.general] Replacement of keys in associative containers Yes 3
1175 Open 23.2.8 [unord.req] unordered complexity Yes 3
2198 Open 23.2.8 [unord.req] max_load_factor(z) makes no strong guarantees, but bans useful behavior Yes 3
2189 Open 23.2.8.2 [unord.req.except] Throwing swap breaks unordered containers' state No 3
617 Open 23.3.3 [array] std::array is a sequence that doesn't satisfy the sequence requirements? No 3
3219 New 23.3.3.1 [array.overview] std::array overview container requirements are incorrect Yes 3
2823 Open 23.3.3.1 [array.overview] std::array initialization is still not permissive enough Yes 3
3488 Open 23.3.3.4 [array.special] Is array<const int, 0> swappable or not? Yes 3
2157 Open 23.3.3.5 [array.zero] How does std::array<T,0> initialization work when T is not default-constructible? Yes 3
4123 New 23.3.5.4 [deque.modifiers] Container effects use "the assignment operator or move assignment operator" Yes 3
3308 New 23.3.5.4 [deque.modifiers] vector and deque iterator erase invalidates elements even when no change occurs Yes 3
1102 Open 23.3.13.3 [vector.capacity] std::vector's reallocation policy still unclear Yes 3
2158 Open 23.3.13.3 [vector.capacity] Conditional copy/move in std::vector Yes 3
3758 New 23.3.13.3 [vector.capacity] Element-relocating operations of std::vector and std::deque should conditionally require Cpp17CopyInsertable in their preconditions No 3
3638 New 23.3.14 [vector.bool] vector<bool>::swap(reference, reference) is useless Yes 3
1422 Open 23.3.14 [vector.bool] vector<bool> iterators are not random access No 3
3531 New 23.4.3.1 [map.overview] LWG 3025 broke previous valid code Yes 3
2713 New 23.5 [unord] More missing allocator-extended constructors for unordered containers Yes 3
3189 New 23.6.4 [priority.queue] Missing requirement for std::priority_queue No 3
3161 Open 23.6.6 [stack] Container adapters mandate use of emplace_back but don't require it Yes 3
3966 New 23.6.8.1 [flat.map.overview] The value_type and reference members of std::flat_(multi)map::(const_)iterator are unclear No 3
3963 New 23.6.8.2 [flat.map.defn] Different std::flat_map/std::flat_multimap specializations should be able to share same nested classes Yes 3
4000 New 23.6.8.7 [flat.map.modifiers] flat_map::insert_range's Effects is not quite right Yes 3
4180 New 23.6.12.5 [flat.multiset.modifiers] Inconsistent constraints on flat_foo::emplace Yes 3
3995 New 23.7.3 [views.multidim] Issue with custom index conversion in <mdspan> No 3
3952 New 24.2 [iterator.synopsis] iter_common_reference_t does not conform to the definition of indirectly_readable Yes 3
4080 New 24.3.2 [iterator.assoc.types] Presumed value and difference types of an iterator type in ranges and non-ranges algorithms No 3
3838 New 24.3.2.1 [incrementable.traits] The last specialization of incrementable_traits is under-constrained Yes 3
3615 New 24.3.2.1 [incrementable.traits] The last specialization of incrementable_traits has wrong operand types Yes 3
3287 New 24.3.2.3 [iterator.traits] Exposition-only cpp17-input-iterator concept is needlessly complex Yes 3
3890 New 24.3.4.4 [iterator.concept.winc] ABI issue for integer-class types Yes 3
3716 New 24.3.4.11 [iterator.concept.forward] §[iterator.concept.forward][forward.iterators] Two different definitions of multi-pass guarantee No 3
484 Open 24.3.5.3 [input.iterators] Convertible to T No 3
2038 Open 24.3.5.4 [output.iterators] Missing definition for incrementable iterator No 3
2035 Open 24.3.5.4 [output.iterators] Output iterator requirements are broken Yes 3
2931 Open 24.4.3 [iterator.operations] Missed optimization opportunity with single-argument std::next No 3
3344 New 24.4.3 [iterator.operations] advance(i, most-negative) and prev(i, most-negative) Yes 3
3197 New 24.4.3 [iterator.operations] std::prev should not require BidirectionalIterator Yes 3
3439 New 24.4.3 [iterator.operations] "Distance" template parameter is underspecified No 3
3623 New 24.5.1.1 [reverse.iterators.general] Uses of std::reverse_iterator with containers should not require manually including <iterator> Yes 3
2595 New 24.5.1.2 [reverse.iterator] reverse_iterator::operator[]'s return type revisited Yes 3
3602 New 24.5.1.4 [reverse.iter.cons] reverse_iterator's converting assignment is overconstrained Yes 3
3725 New 24.5.1.6 [reverse.iter.elem] reverse_iterator::operator-> should not use prev for non-pointer iterators Yes 3
3986 New 24.5.3 [const.iterators] basic_const_iterator doesn't work with optional No 3
3988 Open 24.5.3 [const.iterators] Should as_const_view and basic_const_iterator provide base()? Yes 3
4237 New 24.5.3.3 [const.iterators.iterator] The standard library iterator adaptor does not handle iterator_category correctly No 3
4125 New 24.5.4.2 [move.iterator] move_iterator's default constructor should be constrained Yes 3
4120 New 24.5.4.2 [move.iterator] move_iterator should provide iterator_category only when it models forward_iterator Yes 3
4092 New 24.5.5.1 [common.iterator] The monotonic version of common_iterator::operator== is underconstrained Yes 3
3783 New 24.5.5.1 [common.iterator] views::common may not be a range adaptor object Yes 3
3748 New 24.5.5.6 [common.iter.cmp] common_iterator and counted_iterator' operator- are missing cast to return type Yes 3
2366 New 24.6.4 [istreambuf.iterator] istreambuf_iterator end-of-stream equality Yes 3
3188 New 24.6.4 [istreambuf.iterator] istreambuf_iterator::pointer should not be unspecified Yes 3
3108 New 24.6.4.2 [istreambuf.iterator.proxy] istreambuf_iterator::proxy::operator* should be const Yes 3
4181 New 24.7 [iterator.range] Some ranges have negative ssize No 3
4131 New 24.7 [iterator.range] Including <optional> doesn't provide std::begin/end Yes 3
3537 New 24.7 [iterator.range] §[iterator.range] Missing noexcept for std::rbegin/rend for arrays and initializer_list No 3
4010 New 25.5.4.3 [range.subrange.access] subrange::advance should be improved Yes 3
3985 New 25.5.7.2 [range.utility.conv.to] ranges::to should Mandates C not to be view Yes 3
4008 New 25.5.7.2 [range.utility.conv.to] §[range.utility.conv.to] ranges::to may cause infinite recursion if range_value_t<C> is a non-move-constructible range Yes 3
4018 New 25.5.7.2 [range.utility.conv.to] ranges::to's copy branch is underconstrained Yes 3
3983 New 25.5.7.3 [range.utility.conv.adaptors] ranges::to adaptors are underconstrained Yes 3
3907 New 25.6 [range.factories] Can iterator types of range adaptors and range factories be SCARY? No 3
3614 New 25.6.4.2 [range.iota.view] iota_view::size and the most negative signed integer values Yes 3
4002 New 25.6.4.3 [range.iota.iterator] The definition of iota_view::iterator::iterator_concept should be improved Yes 3
3846 New 25.6.4.3 [range.iota.iterator] iota_view::iterator::operator- is overconstrained Yes 3
3609 New 25.6.4.4 [range.iota.sentinel] std::ranges::iota_view<int, long> has non-subtractable iterator and sentinel types Yes 3
3955 New 25.6.5.2 [range.repeat.view] Add noexcept to several repeat_view[::iterator] member functions Yes 3
3763 New 25.6.5.3 [range.repeat.iterator] Should range adaptor iterators only provide iterator_category when its difference_type is not an integer-class type? Yes 3
3679 LEWG 25.6.6 [range.istream] Is <ranges> sufficient for istream_view? No 3
3489 New 25.6.6.3 [range.istream.iterator] Improve istream_view wording Yes 3
3829 New 25.7.7.2 [range.as.rvalue.view] as_rvalue_view::end should improve non-common case Yes 3
3730 New 25.7.12.2 [range.drop.view] std::ranges::drop_view may have different size type from its underlying view Yes 3
3873 New 25.7.15.2 [range.join.with.view] join_with_view's const begin is underconstrained No 3
4059 New 25.7.15.3 [range.join.with.iterator] Leaky abstraction in join_with_view's iterator Yes 3
3852 New 25.7.15.3 [range.join.with.iterator] join_with_view::iterator's iter_move and iter_swap should be conditionally noexcept Yes 3
3685 New 25.7.16.2 [range.lazy.split.view] In lazy_split_view, CTAD doesn't work when given an input_range input and a tiny-range pattern Yes 3
3599 New 25.7.16.2 [range.lazy.split.view] The const overload of lazy_split_view::begin should be constrained by const Pattern Yes 3
3686 New 25.7.16.3 [range.lazy.split.outer] In lazy_split_view, comparing a default-constructed outer-iterator or inner-iterator with std::default_sentinel results in null pointer dereference Yes 3
4017 New 25.7.17.3 [range.split.iterator] Behavior of std::views::split on an empty range Yes 3
4081 New 25.7.18.3 [range.concat.iterator] concat_view::iterator::operator- is overconstrained Yes 3
4089 New 25.7.18.3 [range.concat.iterator] concat_view::iterator's iter_swap is overconstrained Yes 3
4019 SG9 25.7.21 [range.reverse] Reversing an infinite range leads to an infinite loop No 3
4097 LEWG 25.7.21.1 [range.reverse.overview] views::reverse should be specialized for some view types Yes 3
3830 New 25.7.21.2 [range.reverse.view] reverse_view should not cache when ranges::next has constant time complexity Yes 3
4114 New 25.7.23.3 [range.elements.iterator] elements_view::iterator::operator* missing conditional noexcept specification Yes 3
3832 New 25.7.23.3 [range.elements.iterator] Missing change for element_view::iterator in LWG 3798 Yes 3
3731 New 25.7.25.2 [range.zip.view] zip_view and adjacent_view are underconstrained Yes 3
4210 New 25.7.34.3 [range.cache.latest.iterator] Issue with cache_latest_view::iterator's reference type No 3
4057 New 25.8.6 [coro.generator.iterator] generator::iterator's operator* is not noexcept when it can be Yes 3
2963 New 26 [algorithms] Algorithms with underspecified iterator requirements No 3
1238 Open 26 [algorithms] Defining algorithms taking iterator for range No 3
3049 Open 26.2 [algorithms.requirements] Missing wording allowing algorithms to use copies of function objects as substitutes for their parameters Yes 3
3793 New 26.6.5 [alg.foreach] Requirements for some algorithms' Size template parameters are unclear No 3
4093 New 26.6.18 [alg.fold] ranges::fold_left_first_with_iter incorrectly constructs optional<U> Yes 3
4094 New 26.6.18 [alg.fold] ranges::fold_meow is overconstrained Yes 3
3969 New 26.6.18 [alg.fold] std::ranges::fold_left_first_with_iter should be more ADL-proof Yes 3
3089 New 26.7.1 [alg.copy] copy_n should require non-overlapping ranges Yes 3
2471 Open 26.7.1 [alg.copy] copy_n's number of InputIterator increments unspecified No 3
4103 New 26.7.9 [alg.unique] ranges::unique_copy's constraints for the case where result is an input_iterator are not quite right Yes 3
2267 New 26.8.2.4 [partial.sort.copy] partial_sort_copy underspecified for ranges of two different types No 3
4162 New 26.8.3 [alg.nth.element] Worst time complexity of non-parallel versions of nth_element is underspecified Yes 3
4111 New 26.8.4 [alg.binary.search] LWG 270 and ranges version of binary search algorithms No 3
3534 LEWG 26.8.7.4 [set.intersection] ranges::set_intersection and ranges::set_difference algorithm requirements are too strict Yes 3
3029 Open 26.8.8.3 [pop.heap] pop_heap over-constrains input Yes 3
4167 New 26.8.9 [alg.min.max] Use of "smaller" and "larger" in min, max, and minmax is unclear Yes 3
3487 New 26.10 [numeric.ops] Missing precondition on input and output aliasing of [numeric.ops] No 3
3463 New 26.10.11 [transform.inclusive.scan] Incorrect requirements for transform_inclusive_scan without initial value Yes 3
3628 New 26.11 [specialized.algorithms] "Effects: Equivalent to:" and uninitialized memory algorithms No 3
3063 New 26.11 [specialized.algorithms] Parallel algorithms in <memory> are underspecified No 3
3647 New 26.11.2 [special.mem.concepts] nothrow-input-iterator constraints should not mention copying Yes 3
3888 New 26.11.8 [specialized.construct] Most ranges uninitialized memory algorithms are underconstrained Yes 3
3889 New 26.11.9 [specialized.destroy] std::(ranges::)destroy_at should destroy array elements in the decreasing index order Yes 3
3942 New 27.2.4 [char.traits.specializations] Inconsistent use of const char_type& in standard specializations of std::char_traits Yes 3
2959 New 27.2.4.4 [char.traits.specializations.char16.t] char_traits<char16_t>::eof is a valid UTF-16 code unit No 3
3989 New 27.3 [string.view] The whole range for an iterator obtained from a std::span or std::basic_string_view is not clear No 3
3457 New 27.3.3 [string.view.template] *this is not invalidated Yes 3
3339 New 27.4.3 [basic.string] Move-constructed empty-container capacity No 3
3451 New 27.4.3 [basic.string] Inconsistently explicit deduction guides Yes 3
4029 New 27.4.3.1 [basic.string.general] basic_string accidentally fails to meet the reversible container requirements Yes 3
3663 New 27.4.3.3 [string.cons] basic_string(const T&, const Alloc&) turns moves into copies Yes 3
3662 New 27.4.3.7.2 [string.append] basic_string::append/assign(NTBS, pos, n) suboptimal Yes 3
3837 New 27.4.4.5 [string.erasure] std::erase_if overloads for non-associative containers should move (and not copy) their predicate object Yes 3
2238 Open 27.5 [c.strings] Problematic iterator-pair constructor of containers No 3
3456 New 28.2.3 [charconv.from.chars] Pattern used by std::from_chars is underspecified Yes 3
3353 New 28.3.3.1 [locale] locale's copy assignment operator should return locale& Yes 3
3337 New 28.3.4.2.5.3 [locale.codecvt.virtuals] What is "is initialized" supposed to mean? No 3
3689 New 28.3.4.3.2.3 [facet.num.get.virtuals] num_get overflow determination unclear and incorrect No 3
2117 Open 28.3.4.3.3.3 [facet.num.put.virtuals] ios_base manipulators should have showgrouping/noshowgrouping No 3
2703 New 28.3.4.3.3.3 [facet.num.put.virtuals] No provision for fill-padding when boolalpha is set No 3
4216 New 28.3.4.3.3.3 [facet.num.put.virtuals] num_put::do_put and void pointers Yes 3
2702 New 28.3.4.3.3.3 [facet.num.put.virtuals] num_put::do_put(..., bool) performs ill-formed do_put call No 3
3275 New 28.3.4.6.2.3 [locale.time.get.virtuals] Why does time_get::do_get require a valid pointer when none of the others do? Yes 3
2983 New 28.3.4.7.3.3 [locale.money.put.virtuals] money_put::do_put underspecified Yes 3
2691 New 28.3.4.7.4 [locale.moneypunct] money_base::space and do_put: U+0020 versus fill Yes 3
3651 New 28.5 [format] Unspecified lifetime guarantees for the format string No 3
3641 New 28.5.1 [format.syn] Add operator== to format_to_n_result Yes 3
3939 New 28.5.2.2 [format.string.std] §[format.string.std] char is not formatted as a character when charT is wchar_t No 3
4090 Open 28.5.2.2 [format.string.std] Underspecified use of locale facets for locale-dependent std::format Yes 3
3993 New 28.5.6.1 [formatter.requirements] The parse function of a BasicFormatter type needs to be constexpr Yes 3
3943 New 28.5.6.3 [format.formattable] Clarify lifetime requirements of BasicFormatter and Formatter Yes 3
3706 New 28.5.6.4 [format.formatter.spec] How does std::format work with character arrays of unknown bound? No 3
4107 New 28.5.7.4 [format.range.fmtmap] Map formatter may conflict with user-defined specializations of pair/tuple formatters Yes 3
2490 New 28.6 [re] <regex> needs lots of noexcept No 3
3606 New 28.6.2 [re.req] Missing regex_traits::locale_type requirements No 3
2431 New 28.6.2 [re.req] Missing regular expression traits requirements No 3
3998 New 28.6.4 [re.const] Constants in std::regex_constants should be allowed to be enumerators No 3
2331 Open 28.6.4.2 [re.synopt] regex_constants::collate's effects are inaccurately summarized Yes 3
3605 New 28.6.4.3 [re.matchflag] regex_constants::match_prev_avail is underspecified No 3
2338 Open 28.6.6 [re.traits] §[re.traits]/7 expects of locale facets something not guaranteed by [locale.facet]/4 Yes 3
3261 New 28.6.7 [re.regex] regex components' noexcept annotations appear broken for POCMA or throwing BidirectionalIterator No 3
3604 New 28.6.7.2 [re.regex.construct] What is the effect of an invalid value of type syntax_option_type? No 3
3341 New 28.6.7.2 [re.regex.construct] basic_regex range constructor: Missing requirements for iterator types No 3
3603 New 28.6.7.2 [re.regex.construct] Matching of null characters by regular expressions is underspecified No 3
2137 Open 28.6.7.3 [re.regex.assign] Misleadingly constrained post-condition in the presence of exceptions Yes 3
3126 New 28.6.8 [re.submatch] There's no std::sub_match::compare(string_view) overload Yes 3
2216 New 28.6.10.4 [re.alg.replace] regex_replace(basic_string) allocator handling No 3
2220 Open 28.6.11.2.3 [re.tokiter.comp] Under-specification of operator== for regex_token_iterator Yes 3
2987 New 28.6.12 [re.grammar] Relationship between traits_inst.lookup_collatename and the regex FSM is underspecified with regards to ClassAtomCollatingElement No 3
4161 New 29.4 [complex.numbers] Some free functions don't automatically work for program-defined std::complex<NonFloatingPoint> No 3
3934 New 29.4.3 [complex] std::complex<T>::operator=(const T&) has no specification Yes 3
2714 New 29.4.6 [complex.ops] complex stream extraction underspecified Yes 3
2846 New 29.4.10 [cmplx.over] Undefined phrase "effectively cast" Yes 3
4289 LEWG 29.5.3.2 [rand.req.seedseq] Seed sequence is overspecified Yes 3
4212 New 29.5.4.5 [rand.eng.philox] Make the round states in [rand.eng.philox] explicit Yes 3
3402 New 29.5.9.3.4 [rand.dist.bern.negbin] Wording for negative_binomial_distribution is unclear as a consequence of LWG 2406 resolution No 3
2847 New 29.7.1 [cmath.syn] sin(float) should call sinf(float) No 3
3093 New 29.7.2 [c.math.abs] LWG 2294/2192 missed a std::abs overload No 3
3172 New 29.7.3 [c.math.hypot3] 3-arg std::hypot is underspecified compared to the 2-arg overload Yes 3
3066 New 29.7.6 [sf.cmath] "report a domain error" in [sf.cmath]/1 is underspecified No 3
4185 New 29.9.7 [linalg.helpers] Ill-formed, no diagnostic required on runtime behavior No 3
3090 New 30.5.2 [time.duration.cons] What is §[time.duration.cons]p4's "no overflow is induced in the conversion" intended to mean? Yes 3
3503 New 30.5.8 [time.duration.cast] chrono::ceil has surprising requirement Yes 3
2383 Open 30.5.9 [time.duration.literals] Overflow cannot be ill-formed for chrono::duration integer literals No 3
4288 New 30.7.2.2 [time.clock.system.members] The Constraints: element in [time.clock.system.members] is probably wrong Yes 3
4193 New 30.11.2 [time.zone.db] §[time.zone.db] the specification uses the undefined term "thread-safe" No 3
4067 New 30.11.7.2 [time.zone.zonedtime.ctor] Inconsistency and potential infinity meta-recursion in std::chrono::zoned_time's constructors Yes 3
4139 New 30.11.8 [time.zone.leap] §[time.zone.leap] recursive constraint in <=> No 3
3831 New 30.12 [time.format] Two-digit formatting of negative year is ambiguous Yes 3
4118 New 30.12 [time.format] How should duration formatters format custom rep types? Yes 3
3856 New 30.12 [time.format] Unclear which conversion specifiers are valid for each chrono type Yes 3
3921 New 30.12 [time.format] Is std::chrono::duration<std::int64_t, std::ratio<INT64_MAX - 1, INT64_MAX>>{40} required to be correctly formatted? No 3
3844 Open 30.12 [time.format] Non-numeric formats for negative durations Yes 3
3962 New 30.13 [time.parse] What is the "decimal precision of the input"? Yes 3
3960 New 30.13 [time.parse] How does chrono::parse handle duplicated data? Yes 3
3961 New 30.13 [time.parse] Does chrono::parse check format strings? Yes 3
423 Open 31 [input.output] Effects of negative streamsize in iostreams Yes 3
3696 New 31.2.2 [stream.types] "Basic integral types" should not be used Yes 3
2675 New 31.5.2.7 [ios.base.callback] register_callback can fail No 3
4192 New 31.5.2.8 [ios.base.cons] §[ios.base.cons] ios_base members may not have indeterminate values after construction Yes 3
2504 New 31.6.3 [streambuf] basic_streambuf is not an abstract class No 3
3658 New 31.6.3.3.5 [streambuf.pub.put] basic_streambuf::sputn is both overspecified and underspecified Yes 3
2497 New 31.7.6.2.4 [ostream.sentry] Use of uncaught_exception() Yes 3
4101 New 31.7.6.3.2 [ostream.inserters.arithmetic] LWG 117 loses the sign for negative NaN on some architectures Yes 3
3501 New 31.7.6.5 [ostream.manip] basic_syncbuf-related manipulators refer to some Allocator without defining it Yes 3
3937 New 31.7.7 [std.manip] I/O manipulators should be specified in terms of base classes No 3
2984 New 31.7.8 [ext.manip] put_money(99) is unnecessarily undefined Yes 3
3309 New 31.8 [string.streams] Is <ios> implicitly #included by <sstream>, <fstream> etc.? No 3
3097 New 31.8.2.5 [stringbuf.virtuals] basic_stringbuf seekoff effects trigger undefined behavior and have contradictory returns No 3
3497 New 31.11.2.4 [syncstream.syncbuf.members] Postconditions for basic_syncbuf::emit() No 3
3496 New 31.11.2.4 [syncstream.syncbuf.members] What does "uniquely associated" mean for basic_syncbuf::emit()? No 3
3098 New 31.12.6.5.9 [fs.path.decompose] Misleading example for filesystem::path::filename() Yes 3
3699 New 31.12.6.5.11 [fs.path.gen] lexically_relative on UNC drive paths (\\?\C:\...) results in a default-constructed value No 3
3794 New 31.12.6.6 [fs.path.itr] std::filesystem::path::iterator::reference should be allowed to be std::filesystem::path Yes 3
2947 New 31.12.8.1 [fs.enum.path.format] Clarify several filesystem terms No 3
3078 New 31.12.10 [fs.class.directory.entry] directory_entry, directory_iterator and recursive_directory_iterator perform needless path copies No 3
3668 New 31.12.11.2 [fs.dir.itr.members] [recursive_]directory_iterator constructors refer to undefined options Yes 3
3056 New 31.12.13.5 [fs.op.copy.file] copy_file() copies which attributes? Yes 3
3744 New 31.12.13.6 [fs.op.copy.symlink] copy_symlink(junction, new_symlink)'s behavior is unclear No 3
2819 New 32.2.5 [thread.req.lockable] Unspecified Return type: elements Yes 3
3499 New 32.2.5.4 [thread.req.lockable.timed] Timed lockable and mutex requirements are imprecise about duration and time_point No 3
3924 New 32.3.1 [thread.stoptoken.intro] Stop token data race avoidance requirements unclear Yes 3
3516 New 32.4.3.2 [thread.thread.id] thread::id spaceship may be inconsistent with equality Yes 3
3475 New 32.4.3.3 [thread.thread.constr] std::thread's constructor needs to be able to report general memory allocation failures Yes 3
3633 New 32.5 [atomics] Atomics are copy constructible and copy assignable from volatile atomics Yes 3
3220 New 32.5.2 [atomics.syn] P0558 broke conforming C++14 uses of atomic shared_ptr Yes 3
4004 SG1 32.5.4 [atomics.order] The load and store operation in §[atomics.order] p1 is ambiguous No 3
4174 SG1 32.5.4 [atomics.order] How does [atomics.order] p3 apply when then modification is an initialization? No 3
3941 Open 32.5.4 [atomics.order] §[atomics.order] inadvertently prohibits widespread implementation techniques No 3
3263 New 32.5.6 [atomics.wait] Atomic waiting function calls should only be unblocked once Yes 3
3409 New 32.5.7.2 [atomics.ref.ops] Too lax description of atomic_ref<T>::required_alignment Yes 3
3417 SG1 32.5.8.2 [atomics.types.operations] Missing volatile atomic deprecations Yes 3
3047 New 32.5.8.3 [atomics.types.int] atomic compound assignment operators can cause undefined behavior when corresponding fetch_meow members don't Yes 3
3906 New 32.5.8.5 [atomics.types.pointer] "Undefined address" is undefined No 3
3418 New 32.5.9 [atomics.nonmembers] Deprecated free functions in <atomic> Yes 3
3343 Open 32.7.3 [thread.condition.nonmember] Ordering of calls to unlock() and notify_all() in Effects element of notify_all_at_thread_exit() should be reversed Yes 3
3504 New 32.7.4 [thread.condition.condvar] condition_variable::wait_for is overspecified Yes 3
3898 New 32.9.3.3 [thread.barrier.class] Possibly unintended preconditions for completion functions of std::barrier Yes 3
2530 Open 32.10.5 [futures.state] Clarify observable side effects of releasing a shared state No 3
2532 Open 32.10.6 [futures.promise] Satisfying a promise at thread exit Yes 3
3582 New 32.10.9 [futures.async] Unclear where std::async exceptions are handled Yes 3
4160 New 32.10.10.1 [futures.task.general] packaged_task should reject rvalue reference return types Yes 3
4158 New 32.10.10.2 [futures.task.members] packaged_task::operator= should abandon its shared state Yes 3
2507 New 99 [depr.locale.stdcvt] codecvt_mode should be a bitmask type No 3
3840 Open D.22.1 [depr.fs.path.factory] filesystem::u8path should be undeprecated Yes 3
3812 New 6.1.2.6 [fund.ts.v3::propagate_const.const_observers] [fund.ts.v3] Incorrect constraint on propagate_const conversion function Yes 3
3167 Open 8.2 [fund.ts.v3::memory.observer.ptr] [fund.ts.v3] Does observer_ptr support function types? No 3
3357 Open 99 [fund.ts.v3::rand.util.randint] [fund.ts.v3] default_random_engine is overspecified for per-thread engine Yes 3
3124 New 13.7.5 [networking.ts::async.exec.ctx.globals] [networking.ts] Unclear how execution_context is intended to store services Yes 3
3021 New 16.2.2 [networking.ts::buffer.reqmts.constbuffersequence] [networking.ts] Relax pointer equivalence requirement for ConstBufferSequence Yes 3
3027 New 16.2.4 [networking.ts::buffer.reqmts.dynamicbuffer] [networking.ts] DynamicBuffer prepare exception specification Yes 3
3072 New 16.2.4 [networking.ts::buffer.reqmts.dynamicbuffer] [networking.ts] DynamicBuffer object lifetimes underspecified Yes 3
3073 New 17 [networking.ts::buffer.stream] [networking.ts] (async_)read and (async_)write don't support DynamicBuffer lvalues Yes 3
3445 LEWG 19.2.1 [networking.ts::socket.iostream.cons] [networking.ts] net::basic_socket_istream::connect should be constrained Yes 3

Priority 4 (80 issues)

Issue Status Section Title Proposed Resolution Priority Duplicates
2949 New 16 [library] Unclear complexity requirements: space vs. time No 4
3267 New 16.4.4.6 [allocator.requirements] Rebound allocators and is_always_equal Yes 4
4047 New 16.4.5.2.1 [namespace.std] Explicitly specifying template arguments for std::swap should not be supported No 4
3926 New 16.4.5.2.1 [namespace.std] Which namespace std is the mentioned one? Yes 4
2248 New 17.3.5 [numeric.limits] numeric_limits::is_iec559 misnamed No 4
2493 New 17.11 [support.initlist] initializer_list supports incomplete classes No 4
3883 New 17.15.7 [support.c.headers.other] §[support.c.headers.other] Ambiguity in the requirements for includes Yes 4
4041 New 18.4.9 [concept.swappable] The requirements on literal type in [concept.swappable] should be removed Yes 4
4032 New 20.3.2.2.2 [util.smartptr.shared.const] Possibly invalid types in the constraints of constructors of std::shared_ptr Yes 4
2751 New 20.3.2.2.3 [util.smartptr.shared.dest] shared_ptr deleter not specified to observe expired weak_ptr instances No 4
3681 New 20.5.1 [mem.res.syn] Further considerations on LWG 3679 No 4
3902 New 22.2.6 [declval] Return type of std::declval<cv void> should be (cv-unqualified) void Yes 4
3728 New 22.4.9 [tuple.rel] Can't make neither head nor tail of the description of operator<=>(tuple, tuple) Yes 4
3805 New 22.10 [function.objects] Expression evaluating to a call wrapper is a prvalue, not an object No 4
3979 New 22.10.13 [func.not.fn] Should we reject std::bind_front<42>() and its friends? Yes 4
3968 New 22.11.8 [bit.endian] std::endian::native value should be more specific about object representations Yes 4
4173 New 23 [containers] Better term for "references, pointers and iterators to elements" No 4
4176 New 23 [containers] Refer back to container requirements when extending them No 4
2269 New 23.2.2 [container.requirements.general] Container iterators and argument-dependent lookup No 4
1213 Open 24.3 [iterator.requirements] Meaning of valid and singular iterator underspecified No 4
4055 New 24.4.3 [iterator.operations] §[iterator.operations] std::distance is missing a precondition Yes 4
4303 New 24.4.4.3 [range.iter.op.distance] std::decay_t in the specification of ranges::distance is problematic Yes 4
2858 New 24.5.1 [reverse.iterators] LWG 2472: actually an incompatibility with C++03 Yes 4
4104 New 24.5.3 [const.iterators] basic_const_iterator<volatile int*> is not a contiguous_iterator No 4
4115 New 24.5.4.6 [move.iter.elem] move_iterator::operator* should have conditional noexcept specification Yes 4
3107 New 24.6.4 [istreambuf.iterator] istreambuf_iterator has public exposition-only member Yes 4
3729 New 25.2 [ranges.syn] std::tuple_element_t<std::ranges::subrange<I, S, K>> should remove top-level cv-qualifiers Yes 4
3896 New 25.4.6 [range.refinements] The definition of viewable_range is not quite right Yes 4
4183 New 25.5.4.1 [range.subrange.general] subrange should provide data() Yes 4
3845 New 25.5.7.2 [range.utility.conv.to] ranges::to's from_range_t tag branch has the wrong constraint Yes 4
3722 New 25.5.7.2 [range.utility.conv.to] ranges::to reserves the wrong size Yes 4
3994 New 25.7.2 [range.adaptor.object] adaptor(args...)(r) is not equivalent to std::bind_back(adaptor, args...)(r) No 4
4099 New 25.7.7.1 [range.as.rvalue.overview] The simple case of views::as_rvalue and views::common are not strictly correct Yes 4
3855 New 25.7.16.2 [range.lazy.split.view] tiny-range is not quite right Yes 4
4108 SG9 25.7.16.2 [range.lazy.split.view] lazy_split_view should be sized_range when pattern is empty tiny-range Yes 4
4073 New 25.7.18.2 [range.concat.view] concat_view::size may overflow No 4
4091 New 25.7.18.2 [range.concat.view] concat_view rejects non-movable references Yes 4
3864 New 25.7.25 [range.zip] zip over range of reference to an abstract type No 4
4117 New 25.8.6 [coro.generator.iterator] generator::iterator should provide iterator_concept Yes 4
2173 Open 26 [algorithms] The meaning of operator + in the description of the algorithms Yes 4
3868 LEWG 26.7.5 [alg.replace] Constrained algorithms should not require output_iterator Yes 4
4034 New 26.8.9 [alg.min.max] Clarify specification of std::min and std::max Yes 4
2513 New 27.1 [strings.general] Missing requirements for basic_string::value_type No 4
3694 New 27.2.2 [char.traits.require] Should traits_type::length be customizable? No 4
4152 New 27.2.2 [char.traits.require] The primary template of std::char_traits is totally underspecified Yes 4
2237 New 27.5 [c.strings] <cuchar> macros No 4
3214 New 28.3.4.3.2.3 [facet.num.get.virtuals] §[facet.num.get.virtuals] doesn't say what it means for digit grouping to be consistent No 4
2512 Open 28.3.4.6.2.3 [locale.time.get.virtuals] Y2K bites; what is an "unambiguous year identifier"? No 4
3997 New 28.5.1 [format.syn] std::formatter specializations should be consistently restricted to supported character types No 4
4078 New 28.5.5 [format.functions] What if arguments alias the output buffer in std::format_to? No 4
523 Open 28.6 [re] regex case-insensitive character ranges are unimplementable as specified No 4
3835 New 28.6.1 [re.general] Requirements for CharT in the regex library No 4
3630 New 28.6.7.2 [re.regex.construct] Inconsistent basic_regex construction and assignment from iterator range No 4
2986 New 28.6.12 [re.grammar] Handling of multi-character collating elements by the regex FSM is underspecified No 4
2546 New 28.6.12 [re.grammar] Implementability of locale-sensitive UnicodeEscapeSequence matching No 4
3933 New 29.4.3 [complex] P1467R9 accidentally changed the signatures of certain constructors of std::complex Yes 4
4052 New 29.5.9.6.2 [rand.dist.samp.pconst] Bogus requirements for piecewise_linear_distribution Yes 4
3964 New 29.6.3.3 [valarray.transcend] std::atan2 and std::pow overloads that take two std::valarray parameters should require the arguments to have the same length Yes 4
2423 New 29.6.5 [template.slice.array] Missing specification slice_array, gslice_array, mask_array, indirect_array copy constructor Yes 4
2115 Open 29.6.8 [template.mask.array] Undefined behaviour for valarray assignments with mask_array index? No 4
2923 New 29.7.1 [cmath.syn] noexcept is inconsistently applied across headers which import components of the C standard library No 4
2592 New 30.2 [time.syn] Require that chrono::duration_casts from smaller durations to larger durations do not overflow Yes 4
3678 New 30.11.5.1 [time.zone.overview] Constructors of std::chrono::time_zone might be overly unspecified Yes 4
3910 New 31.4.2 [iostream.objects.overview] The effects of including <iostream> on initialization are not yet precisely specified Yes 4
3675 New 31.5.2.6 [ios.base.storage] std::ios_base::iword/pword might be misspecified Yes 4
2214 Open 31.5.4.2 [basic.ios.cons] Clarify basic_ios::init call restrictions Yes 4
2342 New 31.7.6.2 [ostream] User conversion to wchar_t const* or to wchar_t not invoked for operator<< Yes 4
2286 Open 31.8.2.5 [stringbuf.virtuals] stringbuf::underflow() underspecified Yes 4
2265 Open 32.5.4 [atomics.order] 29.3p9 appears to rule out some acceptable executions No 4
3999 New 32.5.4 [atomics.order] P0439R0 changed the value category of memory order constants Yes 4
3268 New 32.5.4 [atomics.order] memory_order::memory_order_foo broken in C++20 Yes 4
4177 SG1 32.5.4 [atomics.order] §[atomics.order] p8 "circularly depend on their own computation" is unclear for loop No 4
2202 Deferred 32.10.9 [futures.async] Missing allocator support by async No 4
2480 New 99 [depr.conversions.buffer] Error handling of wbuffer_convert unclear No 4
2479 New 99 [depr.conversions.buffer] Unclear how wbuffer_convert uses cvtstate No 4
2478 New 99 [depr.conversions.string] Unclear how wstring_convert uses cvtstate No 4
3095 New 99 [depr.strstreambuf.virtuals] strstreambuf refers to nonexistent member of fpos, fpos::offset Yes 4
3109 New 99 [depr.strstreambuf] strstreambuf is copyable No 4
2481 New 99 [depr.conversions.string] wstring_convert should be more precise regarding "byte-error string" etc. No 4
4295 New 8.2.6 [fund.ts.v3::memory.observer.ptr.special] [fund.ts.v3] experimental::observer_ptr should have more constexpr Yes 4

Not Prioritized (193 issues)

Issue Status Section Title Proposed Resolution Priority Duplicates
4317 New 16.4.4.2 [utility.arg.requirements] The meaning of "resource" in the Cpp17Destructible requirements is undefined Yes
4296 New 16.4.4.5 [hash.requirements] Clarify that Cpp17Hash does not imply stateless No
4258 New 16.4.4.6.1 [allocator.requirements.general] Size type mismatch in constraints involving Cpp17Allocator No
4149 New 16.4.5.3.3 [macro.names] User defined macros without standard headers (294 redux) Yes
4068 New 16.4.5.11 [res.on.requirements] Terminology for objects whose types model a concept No
4129 New 16.4.6.10 [res.on.data.races] Possibly incorrect wording for data race avoidance Yes
4286 New 17.3.2 [version.syn] Some more feature-test macros for fully freestanding features are not marked freestanding Yes
4207 New 17.8.2.2 [support.srcloc.cons] Point of reference for source_location is not specified when used in an default template argument Yes
4051 New 17.12.2 [cmp.categories] A less hacky and more useful way to compare comparison category types Yes
4305 New 17.12.7 [compare.type] Missing user requirements on type_order template Yes
4388 New 17.14.2 [cstdarg.syn] Align new definition of va_start with C23 Yes
3454 Open 20.2.3 [pointer.traits] pointer_traits::pointer_to should be constexpr Yes
4058 New 20.2.4 [pointer.conversion] std::to_address() should be SFINAE-friendly Yes
4290 New 20.2.5 [ptr.align] Missing Mandates clauses on is_sufficiently_aligned Yes
4168 New 20.2.6 [obj.lifetime] std::start_lifetime_as inadvertently has undefined behavior due to use of std::bit_cast Yes
4282 New 20.2.6 [obj.lifetime] Imprecise Throws: clause in std::relocate Yes
4283 New 20.2.6 [obj.lifetime] std::trivially_relocate needs stronger preconditions on "nested" objects with dynamic lifetime Yes
4312 New 20.2.8.2 [allocator.uses.construction] Const and value category mismatch for allocator_arg_t/allocator_arg in the description of uses-allocator construction Yes
4324 New 20.3.1.3.5 [unique.ptr.single.observers] unique_ptr<void>::operator* is not SFINAE-friendly Yes
4110 New 20.3.2.2.2 [util.smartptr.shared.const] shared_ptr(nullptr_t, Deleter) is overconstrained, breaking some sensible deleters Yes
4250 New 20.4.1.7 [indirect.swap] swap overloads for indirect and polymorphic only found by ADL Yes
4325 New 20.4.1.8 [indirect.relops] std::indirect's operator== still does not support incomplete types Yes
4311 New 20.5.3.3 [mem.poly.allocator.mem] Can std::pmr::polymorphic_allocator::construct just call std::uninitialized_construct_using_allocator? Yes
2922 LEWG 21.3.3 [meta.type.synop] The *_constant<> templates do not make use of template<auto> No
4383 New 21.3.5 [const.wrap.class] constant_wrapper's pseudo-mutators are underconstrained Yes
3486 LEWG 21.3.6.4 [meta.unary.prop] is_constructible<T[], T...> may be misleading in C++20 No
3967 New 21.3.6.4 [meta.unary.prop] The specification for std::is_nothrow_* traits may be ambiguous in some cases involving noexcept(false) No
4028 New 21.3.8 [meta.rel] std::is_(nothrow_)convertible should be reworded to avoid dependence on the return statement Yes
4138 New 21.3.12 [meta.const.eval] is_within_lifetime should mandate is_object Yes
4316 New 21.4.13 [meta.reflection.substitute] {can_}substitute specification is ill-formed No
4313 New 22.4.4.2 [tuple.cnstr] Uses-allocator construction of pair in tuple's allocator_arg_t constructors Yes
4267 New 22.4.4.2 [tuple.cnstr] Uses-allocator construction is meaningless for tuple of references Yes
532 LEWG 22.4.9 [tuple.rel] Tuple comparison Yes 348
4281 New 22.5.3.7 [optional.observe] Inconsistency between value_or() and error_or() in std::expected No
4406 New 22.5.3.7 [optional.observe] optional::value_or return statement is inconsistent with Mandates Yes
4304 New 22.5.4.6 [optional.ref.observe] std::optional<NonReturnable&> is ill-formed due to value_or Yes
4367 New 22.5.4.7 [optional.ref.monadic] Improve optional<T&>::or_else Yes
4299 New 22.5.4.7 [optional.ref.monadic] Missing Mandates: part in optional<T&>::transform Yes
4370 New 22.5.9 [optional.comp.with.t] Comparison of optional<T> to T may be ill-formed Yes
2991 Open 22.6.3.2 [variant.ctor] variant copy constructor missing noexcept(see below) Yes
4366 New 22.8.6.8 [expected.object.eq] Heterogeneous comparison of expected may be ill-formed Yes
4268 New 22.10.4 [func.require] function<void()> suppresses nodiscard warnings No
4319 New 22.10.4 [func.require] Supporting copy-elision in function wrappers Yes
4264 New 22.10.17.1 [func.wrap.general] Skipping indirection is not allowed for function_ref Yes
4255 New 22.10.17.4.3 [func.wrap.move.ctor] move_only_function constructor should recognize empty copyable_functions Yes
4373 New 22.10.17.6.2 [func.wrap.ref.class] function_ref should provide result_type Yes
4256 New 22.10.17.6.3 [func.wrap.ref.ctor] Incorrect constrains for function_ref constructors from nontype_t Yes
4365 New 22.10.18.3 [func.search.bm] boyer_moore_searcher and boyer_moore_horspool_searcher should be constexpr-friendly Yes
2884 LEWG 23 [containers] Relational operators for containers should sfinae; if the underlying type is not comparable, neither should the container be No
2885 LEWG 23 [containers] The relational operators of optional and variant completely reflect the semantics of the element types — this is inconsistent with other types in the library No
3976 New 23.2.2.5 [container.alloc.reqmts] What does it mean for a type to be "allocator aware"? No
4396 New 23.2.4 [sequence.reqmts] Improve inplace_vector(from_range_t, R&& rg) Yes
4225 New 23.3.5.3 [deque.capacity] What should happen when an exception is thrown on resizing std::deque, std::forward_list, or std::list? No
4320 New 23.3.9 [hive] hive operations involving insertion/erasure should have 𝒪(log n) time complexity Yes
4379 New 23.3.9.3 [hive.capacity] hive::reserve() needs Throws: element adjusted to match block min/max considerations Yes
4380 New 23.3.9.3 [hive.capacity] hive::reserve() complexity does not reflect potential deallocation of blocks Yes
4323 New 23.3.9.5 [hive.operations] hive::unique time complexity should incorporate potential block removal complexity Yes
4219 New 23.3.13.6 [vector.erasure] std::vector::erase[_if] should be based on ranges remove Yes
4398 New 23.6.2 [queue.syn] enable_nonlocking_formatter_optimization should be disabled for container adaptors Yes
4371 New 23.6.3.1 [queue.defn] Container adaptor's empty/size should be noexcept Yes
4350 New 23.6.8 [flat.map] Should flat adaptors use insert_range when available? No
3959 New 23.6.8 [flat.map] Should the comparator of std::flat_map/std::flat_multimap be copied twice in some operations? No
4374 New 23.6.8.7 [flat.map.modifiers] flat_meow range insertion behavior is unclear if in-place merge cannot allocate additional memory No
4352 New 23.6.9.1 [flat.multimap.overview] "operations on flat_multimap are equivalent to those of flat_map" No
4384 New 23.6.11.2 [flat.set.defn] flat_set::erase(iterator) is underconstrained Yes
4351 New 23.7.2.1 [span.syn] integral-constant-like needs more remove_cvref_t Yes
4397 New 23.7.2.2.2 [span.cons] Improve span(R&& r) Yes
4404 New 23.7.2.2.3 [span.deduct] Should span(R&&) CTAD apply P2280? Yes
4275 New 23.7.3.2 [mdspan.syn] std::dynamic_extent should also be defined in <mdspan> Yes
4020 New 23.7.3.3.2 [mdspan.extents.expo] extents::index-cast weirdness Yes
4314 New 23.7.3.4 [mdspan.layout] Missing move in mdspan layout mapping::operator() Yes
4372 New 23.7.3.4.8.1 [mdspan.layout.leftpad.overview] Weaken Mandates: for dynamic padding values in padded layouts Yes
4021 New 23.7.3.6.1 [mdspan.mdspan.overview] mdspan::is_always_meow() should be noexcept Yes
4405 New 23.7.3.6.2 [mdspan.mdspan.cons] mdspan constructor should disallow derived to base conversions Yes
4271 New 24.3.1 [iterator.requirements.general] Caching range views claim amortized amortized 𝒪(1) runtime complexity for algorithms that are in fact 𝒪(n) Yes
4171 New 24.3.6.3 [indirectcallable.indirectinvocable] P2609R3 breaks code that uses views::zip and get<T> No
4270 New 24.3.6.4 [projected] Diagnose misuse of std::projected::operator* Yes
4385 New 24.7 [iterator.range] Including <simd> doesn't provide std::begin/end Yes
4387 Open 24.7 [iterator.range] Including <stacktrace> doesn't provide std::begin/end Yes
4307 New 25.2 [ranges.syn] Make good use of sized-random-access-range and bidirectional-common in <ranges> Yes
4062 New 25.3.13 [range.prim.empty] ranges::empty has no semantic requirements for forward_ranges No
4389 New 25.4.2 [range.range] ranges::for_each possibly behaves differently from range-based for Yes
4229 New 25.5.7.2 [range.utility.conv.to] std::ranges::to with union return type Yes
4066 New 25.5.7.2 [range.utility.conv.to] ranges::to should reserve when sized_sentinel_for is satisfied Yes
4381 New 25.5.7.2 [range.utility.conv.to] std::ranges::to specification using CTAD not supported by core language Yes
4214 New 25.7.10.1 [range.take.overview] Missing Preconditions for take/drop adaptor Yes
4050 New 25.7.10.1 [range.take.overview] Should views::iota(0) | views::take(5) be views::iota(0, 5)? Yes
4009 New 25.7.12.2 [range.drop.view] drop_view::begin const may have 𝒪(n) complexity Yes
4401 New 25.7.14.2 [range.join.view] join_view should be sized_range when applied to ranges of simd::vec Yes
4220 New 25.7.14.2 [range.join.view] join_view incorrectly stores inner range Yes
4249 New 25.7.16.3 [range.lazy.split.outer] The past end issue for lazy_split_view Yes
4166 New 25.7.18.2 [range.concat.view] concat_view::end() should be more constrained in order to support noncopyable iterators Yes
4116 New 25.7.24.3 [range.enumerate.iterator] enumerate_view::iterator and cartesian_product_view::iterator should not always provide iterator_category Yes
4254 New 25.7.32.3 [range.stride.iterator] stride_view::iterator should provide operator-> Yes
4277 New 26.2 [algorithms.requirements] §[algorithms.requirements] It is unclear what an algorithm is Yes
4273 New 26.3.6 [execpol] Standard execution policy types should be conventional tag class types Yes
4297 New 26.4 [algorithm.syn] Missing permutable constraint for iterator overloads in Parallel Range Algorithms Yes
4241 New 26.6.5 [alg.foreach] ranges::for_each(_n) should be less constrained Yes
4262 New 26.7.1 [alg.copy] copy_if, remove_copy, remove_copy_if, unique_copy have too strong preconditions Yes
4269 New 26.7.9 [alg.unique] unique_copy passes arguments to its predicate backwards Yes
2985 LEWG 26.7.10 [alg.reverse] std::reverse should be permitted to be vectorized Yes
2973 LEWG 26.8.6 [alg.merge] inplace_merge exact comparison count complexity prohibits useful real-world optimizations Yes
4265 New 26.10.16 [numeric.ops.midpoint] std::midpoint should not accept const bool Yes
2883 LEWG 27.3 [string.view] The standard library should provide string_view parameters instead or in addition for functions defined with char const * or string const & as parameter types. No
4378 New 27.4.3.6 [string.access] Inconsistency between std::basic_string's data() and operator[] specification Yes
4259 New 27.4.3.8.2 [string.find] P1148R0 changed the return values of searching functions of std::basic_string on some platforms Yes
4261 New 27.4.3.8.2 [string.find] P1206R7 broke uses of container adaptors with old custom sequence containers No
4287 New 28.3.4.2.5.3 [locale.codecvt.virtuals] §[locale.codecvt.virtuals] do_in and do_out could do with better specification Yes
4285 New 28.3.4.6.2.2 [locale.time.get.members] time_get::do_get_date is problematic even after LWG 461 No
4263 New 28.5 [format] What should std::format_to etc. behave when the output is overlong? No
4146 New 28.5.6.4 [format.formatter.spec] §[format.formatter.spec]/3 unconditionally enables nonlocking for container adaptors Yes
4284 New 28.5.6.4 [format.formatter.spec] Integer-class types should be formattable Yes
4221 New 28.5.7 [format.range] Cannot format const-iterable only ranges No
4399 New 28.5.9 [format.tuple] enable_nonlocking_formatter_optimization for pair and tuple needs remove_cvref_t Yes
4109 New 29.5.3.1 [rand.req.genl] Instantiating templates in §[rand] with int8_t/uint8_t is undefined behavior Yes
4136 New 29.9.3 [linalg.general] Specify behavior of [linalg] Hermitian algorithms on diagonal with nonzero imaginary part Yes
4302 New 29.9.13.8 [linalg.algs.blas1.ssq] Problematic vector_sum_of_squares wording Yes
4409 New 29.10 [simd] Constant expression ranges::size(r) Constraints and Mandates in [simd] Yes
4407 New 29.10.7.2 [simd.ctor] constexpr-wrapper-like needs remove_cvref_t in simd::basic_vec constructor Yes
4403 New 29.10.7.2 [simd.ctor] simd::basic_vec CTAD misses difference type casting Yes
4390 New 29.10.7.2 [simd.ctor] simd::basic_vec(U&&) default template parameter Yes
4391 New 29.10.7.2 [simd.ctor] Ambiguities of simd::basic_vec constructor Yes
4408 New 29.10.7.3 [simd.subscr] Hardening simd::vec::operator[] Yes
4392 New 29.10.8.7 [simd.loadstore] simd::unchecked_load misses difference type casting Yes
4394 New 29.10.8.7 [simd.loadstore] simd::unchecked_load(I first, S last) construct span maybe ill-formed Yes
4393 New 29.10.8.11 [simd.permute.memory] simd::unchecked_scatter_to is underconstrained Yes
4386 New 29.10.8.13 [simd.alg] std::simd::select(bool c, const T& a, const U& b) is underconstrained Yes
4375 New 29.10.8.15 [simd.bit] std::simd::bit_ceil should not be noexcept Yes
4402 New 29.10.9.1 [simd.mask.overview] List-initialization of iterators in [simd.mask.overview] Yes
4382 New 29.10.9.2 [simd.mask.ctor] The simd::basic_mask(bool) overload needs to be more constrained Yes
4376 New 29.10.9.4 [simd.mask.unary] ABI tag in return type of [simd.mask.unary] is overconstrained Yes
4211 New 30.11.2.1 [time.zone.db.tzdb] IANA time zone database allows links to refer to links Yes
4400 New 30.12 [time.format] enable_nonlocking_formatter_optimization for durations with custom rep Yes
4022 New 30.12 [time.format] Ambiguity in the formatting of negative years with format specifier %C Yes
4039 New 31.7.6.3.5 [ostream.formatted.print] §[ostream.formatted.print]: Inappropriate usage of badbit in definition of vprint_unicode/vprint_nonunicode Yes
4364 New 31.7.7 [std.manip] SFINAE-friendliness on operator<< and operator>> for unspecified I/O manipulators No
3992 New 31.8.2.4 [stringbuf.members] basic_stringbuf::str()&& should enforce 𝒪(1) Yes
4279 New 31.12.13.2 [fs.op.absolute] §[fs.op.absolute] Non-normative encouragement should be Recommended practice No
4362 New 32.3.8 [stoptoken.inplace] Inconsistent usage of constexpr for inplace_stop_token and inplace_stop_source Yes
1484 LEWG 32.4.3 [thread.thread.class] Need a way to join a thread with a timeout No
4310 New 32.4.3.3 [thread.thread.constr] Is "the completion of the invocation of the constructor" considered as an expression? No
2236 SG1 32.5.2 [atomics.syn] kill_dependency unconditionally noexcept No
4309 New 32.5.4 [atomics.order] How are two seq_cst operations ordered in the single total order if these two operations are unsequenced? No
1459 LEWG 32.5.4 [atomics.order] Overlapping evaluations are allowed No 1458
4377 New 32.5.7.2 [atomics.ref.ops] Misleading note about lock-free property of std::atomic_ref Yes
4244 New 32.5.7.2 [atomics.ref.ops] Whether the spuriously failed comparison applies to compare_exchange_strong is unclear No
4321 New 32.5.8.2 [atomics.types.operations] How are evaluations occurring within a store and a load operation ordered where the store synchronized with the load No
1488 LEWG 32.6 [thread.mutex] Improve interoperability between the C++0x and C1x threads APIs No
961 LEWG 32.6.4 [thread.mutex.requirements] Various threading bugs #11 No 936
936 LEWG 32.6.4 [thread.mutex.requirements] Mutex type overspecified No 961
1493 LEWG 32.6.4 [thread.mutex.requirements] Add mutex, recursive_mutex, is_locked function No
4353 New 33 [exec] Uses of MANDATE-NOTHROW in CPOs should not enclose CPO argument sub-expressions No
4260 New 33.2.1 [exec.queryable.general] Query objects must be default constructible Yes
4326 New 33.5.1 [exec.fwd.env] Standard defined queries can't customize forwarding_query_t by inheriting from it Yes
4354 New 33.5.8 [exec.get.fwd.progress] Reconsider weakly_parallel as the default forward_progress_guarantee Yes
4327 New 33.6 [exec.sched] Equal schedulers should be required to have same behaviour No
4328 New 33.6 [exec.sched] Remove note in §[exec.sched] regarding waiting for completion of scheduled operations Yes
4213 New 33.9 [exec.snd] Sender spec depends on unspecified order of evaluation No
4278 New 33.9.2 [exec.snd.expos] Consider changing how get-domain-early(sndr) works No
4368 New 33.9.5 [exec.domain.default] Potential dangling reference returned from transform_sender Yes
4363 New 33.9.6 [exec.snd.transform] transform_sender comparing types ignoring cv-qualifiers doesn't take into account differences in value category Yes
4355 New 33.9.10 [exec.connect] connect-awaitable() should mandate rcvr can receive all completion-signals rather than using constraints Yes
4356 New 33.9.10 [exec.connect] connect() should use get_allocator(get_env(rcvr)) to allocate the coroutine-state for a connect-awaitable coroutine Yes
4357 New 33.9.10 [exec.connect] connect-awaitable should use is_void_v to check for result-type of co_await expression instead of same_as<void> Yes
4395 New 33.9.12.3 [exec.write.env] write_env implementation-detail lambda should have explicit return type No
4369 New 33.9.12.9 [exec.then] check-types function for upon_error and upon_stopped is wrong Yes
4359 New 33.13.1 [exec.as.awaitable] as_awaitable(expr, p) does not define semantics of call if p is not an lvalue Yes
4358 New 33.13.1 [exec.as.awaitable] §[exec.as.awaitable] is using "Preconditions:" when it should probably be described in the constraint Yes
4360 New 33.13.1 [exec.as.awaitable] awaitable-sender concept should qualify use of awaitable-receiver type Yes
4361 New 33.13.1 [exec.as.awaitable] awaitable-receiver::set_value should use Mandates instead of constraints Yes
4330 New 33.13.3 [exec.affine.on] affine_on semantics No
4331 New 33.13.3 [exec.affine.on] affine_on shape may be wrong No
4332 New 33.13.3 [exec.affine.on] affine_on shouldn't forward the stop token to the scheduling operation No
4344 New 33.13.3 [exec.affine.on] affine_on has no specification for the default Yes
4329 New 33.13.3 [exec.affine.on] Customising affine_on for other algorithms No
4336 New 33.13.5 [exec.task.scheduler] bulk vs. task_scheduler No
4342 New 33.13.5 [exec.task.scheduler] Missing rvalue reference qualification for task_scheduler::ts-sender::connect() Yes
4339 New 33.13.6 [exec.task] task's coroutine frame may be released late Yes
4338 New 33.13.6.2 [task.class] sender unaware coroutines should be able to co_await a task No
4341 New 33.13.6.2 [task.class] Missing rvalue reference qualification for task::connect() Yes
4343 New 33.13.6.2 [task.class] Missing default template arguments for task Yes
4348 New 33.13.6.2 [task.class] task doesn't support symmetric transfer No
4333 New 33.13.6.5 [task.promise] task uses unusual allocator customisation No
4335 New 33.13.6.5 [task.promise] task shadows the environment's allocator No
4337 New 33.13.6.5 [task.promise] co_await change_coroutine_scheduler(s) requires assignable Yes
4340 New 33.13.6.5 [task.promise] task::promise_type::unhandled_stopped() should be noexcept Yes
4345 New 33.13.6.5 [task.promise] task::promise_type::return_value default template parameter Yes
4346 New 33.13.6.5 [task.promise] task::promise_type::return_void/value lack a specification Yes
4347 New 33.13.6.5 [task.promise] task's stop source is always created No
4349 New 33.13.6.5 [task.promise] task is not actually started lazily Yes
4334 New 33.13.6.5 [task.promise] task<...>::promise_type supports arbitrary allocator_arg position No
2533 SG1 99 [concurr.ts::futures.unique.future] [concurr.ts] Constrain threads where future::then can run a continuation No
3114 LEWG 16 [networking.ts::buffer] [networking.ts] Permit efficient composition when using DynamicBuffer Yes