libc++ C++2c Status

Overview

In June 2023, the C++ standard committee adopted the first changes to the next version of the C++ standard, known here as “C++2c” (probably to be C++26).

This page shows the status of libc++; the status of clang’s support of the language features is here.

Attention

Features in unreleased drafts of the standard are subject to change.

The groups that have contributed papers:

• CWG - Core Language Working group

• LWG - Library working group

• SG1 - Study group #1 (Concurrency working group)

Note

“Nothing to do” means that no library changes were needed to implement this change.

Paper Status

Paper #	Paper Name	Meeting	Status	First released version	Notes
P2497R0	Testing for success or failure of <charconv> functions	2023-06 (Varna)	Complete	18
P2592R3	Hashing support for std::chrono value classes	2023-06 (Varna)
P2587R3	to_string or not to_string	2023-06 (Varna)
P2562R1	constexpr Stable Sorting	2023-06 (Varna)	Complete	21
P2545R4	Read-Copy Update (RCU)	2023-06 (Varna)
P2530R3	Hazard Pointers for C++26	2023-06 (Varna)
P2538R1	ADL-proof std::projected	2023-06 (Varna)	Complete	18
P2495R3	Interfacing stringstreams with string_view	2023-06 (Varna)	Complete	19
P2510R3	Formatting pointers	2023-06 (Varna)	Complete	17	Implemented as a DR against C++20. (MSVC STL and libstdc++ will do the same.)
P2198R7	Freestanding Feature-Test Macros and Implementation-Defined Extensions	2023-06 (Varna)
P2338R4	Freestanding Library: Character primitives and the C library	2023-06 (Varna)
P2013R5	Freestanding Language: Optional ::operator new	2023-06 (Varna)
P2363R5	Extending associative containers with the remaining heterogeneous overloads	2023-06 (Varna)
P1901R2	Enabling the Use of weak_ptr as Keys in Unordered Associative Containers	2023-06 (Varna)
P1885R12	Naming Text Encodings to Demystify Them	2023-06 (Varna)
P0792R14	function_ref: a type-erased callable reference	2023-06 (Varna)
P2874R2	P2874R2: Mandating Annex D Require No More	2023-06 (Varna)	Complete	12
P2757R3	Type-checking format args	2023-06 (Varna)
P2637R3	Member visit	2023-06 (Varna)	Complete	19	Change of __cpp_lib_variant is completed in LLVM 20. Change of __cpp_lib_format is blocked by P2419R2.
P2641R4	Checking if a union alternative is active	2023-06 (Varna)
P1759R6	Native handles and file streams	2023-06 (Varna)	Complete	18
P2697R1	Interfacing bitset with string_view	2023-06 (Varna)	Complete	18
P1383R2	More constexpr for <cmath> and <complex>	2023-06 (Varna)
P2734R0	Adding the new SI prefixes	2023-06 (Varna)	Complete	17
P2548R6	copyable_function	2023-06 (Varna)
P2714R1	Bind front and back to NTTP callables	2023-06 (Varna)	Partial	20
P2630R4	submdspan	2023-06 (Varna)
P0543R3	Saturation arithmetic	2023-11 (Kona)	Complete	18
P2407R5	Freestanding Library: Partial Classes	2023-11 (Kona)
P2546R5	Debugging Support	2023-11 (Kona)
P2905R2	Runtime format strings	2023-11 (Kona)	Complete	18
P2918R2	Runtime format strings II	2023-11 (Kona)	Complete	18
P2909R4	Fix formatting of code units as integers (Dude, where’s my char?)	2023-11 (Kona)	Complete	18
P0952R2	A new specification for std::generate_canonical	2023-11 (Kona)
P2447R6	std::span over an initializer list	2023-11 (Kona)	Complete	18
P2821R5	span.at()	2023-11 (Kona)	Complete	18
P2868R3	Remove Deprecated std::allocator Typedef From C++26	2023-11 (Kona)	Complete	18
P2870R3	Remove basic_string::reserve() From C++26	2023-11 (Kona)	Complete	18
P2871R3	Remove Deprecated Unicode Conversion Facets from C++26	2023-11 (Kona)	Complete	18
P2819R2	Add tuple protocol to complex	2023-11 (Kona)	Complete	19
P2937R0	Freestanding: Remove strtok	2023-11 (Kona)
P2833R2	Freestanding Library: inout expected span	2023-11 (Kona)
P2836R1	std::basic_const_iterator should follow its underlying type’s convertibility	2023-11 (Kona)
P2264R7	Make assert() macro user friendly for C and C++	2023-11 (Kona)
P1673R13	A free function linear algebra interface based on the BLAS	2023-11 (Kona)
P2875R4	Undeprecate polymorphic_allocator::destroy for C++26	2024-03 (Tokyo)	Complete	15
P2867R2	Remove Deprecated strstreams From C++26	2024-03 (Tokyo)	Complete	19
P2869R4	Remove Deprecated shared_ptr Atomic Access APIs from C++26	2024-03 (Tokyo)
P2872R3	Remove wstring_convert From C++26	2024-03 (Tokyo)	Complete	19
P3107R5	Permit an efficient implementation of std::print	2024-03 (Tokyo)
P3142R0	Printing Blank Lines with println	2024-03 (Tokyo)	Complete	19	Implemented as a DR against C++23. (MSVC STL and libstdc++ will do the same.)
P2845R8	Formatting of std::filesystem::path	2024-03 (Tokyo)
P0493R5	Atomic minimum/maximum	2024-03 (Tokyo)
P2542R8	views::concat	2024-03 (Tokyo)
P2591R5	Concatenation of strings and string views	2024-03 (Tokyo)	Complete	19
P2248R8	Enabling list-initialization for algorithms	2024-03 (Tokyo)
P2810R4	is_debugger_present is_replaceable	2024-03 (Tokyo)
P1068R11	Vector API for random number generation	2024-03 (Tokyo)
P2944R3	Comparisons for reference_wrapper	2024-03 (Tokyo)	Complete	21
P2642R6	Padded mdspan layouts	2024-03 (Tokyo)
P3029R1	Better mdspan’s CTAD	2024-03 (Tokyo)	Complete	19
P2747R2	constexpr placement new	2024-06 (St. Louis)	Complete	20
P2997R1	Removing the common reference requirement from the indirectly invocable concepts	2024-06 (St. Louis)	Complete	19	Implemented as a DR against C++20. (MSVC STL and libstdc++ will do the same.)
P2389R2	dextents Index Type Parameter	2024-06 (St. Louis)	Complete	19
P3168R2	Give std::optional Range Support	2024-06 (St. Louis)	Complete	22
P3217R0	Adjoints to ‘Enabling list-initialization for algorithms’: find_last	2024-06 (St. Louis)
P2985R0	A type trait for detecting virtual base classes	2024-06 (St. Louis)	Complete	20
P0843R14	inplace_vector	2024-06 (St. Louis)
P3235R3	std::print more types faster with less memory	2024-06 (St. Louis)
P2968R2	Make std::ignore a first-class object	2024-06 (St. Louis)	Complete	19
P2075R6	Philox as an extension of the C++ RNG engines	2024-06 (St. Louis)
P2422R1	Remove nodiscard annotations from the standard library specification	2024-06 (St. Louis)	Complete	19	nodiscard attributes were kept as a conforming extension
P2300R10	std::execution	2024-06 (St. Louis)
P3136R1	Retiring niebloids	2024-11 (Wrocław)	Complete	14
P3138R5	views::cache_latest	2024-11 (Wrocław)
P3379R0	Constrain std::expected equality operators	2024-11 (Wrocław)	Complete	21
P2862R1	text_encoding::name() should never return null values	2024-11 (Wrocław)
P2897R7	aligned_accessor: An mdspan accessor expressing pointer over-alignment	2024-11 (Wrocław)	Complete	21
P3355R1	Fix submdspan for C++26	2024-11 (Wrocław)
P3222R0	Fix C++26 by adding transposed special cases for P2642 layouts	2024-11 (Wrocław)
P3050R2	Fix C++26 by optimizing linalg::conjugated for noncomplex value types	2024-11 (Wrocław)
P3396R1	std::execution wording fixes	2024-11 (Wrocław)
P2835R7	Expose std::atomic_ref’s object address	2024-11 (Wrocław)
P3323R1	cv-qualified types in atomic and atomic_ref	2024-11 (Wrocław)
P3508R0	Wording for “constexpr for specialized memory algorithms”	2024-11 (Wrocław)
P3369R0	constexpr for uninitialized_default_construct	2024-11 (Wrocław)
P3370R1	Add new library headers from C23	2024-11 (Wrocław)
P3309R3	constexpr atomic and atomic_ref	2024-11 (Wrocław)
P1928R15	std::simd — merge data-parallel types from the Parallelism TS 2	2024-11 (Wrocław)
P3325R5	A Utility for Creating Execution Environments	2024-11 (Wrocław)
P3068R6	Allowing exception throwing in constant-evaluation	2024-11 (Wrocław)
P3247R2	Deprecate the notion of trivial types	2024-11 (Wrocław)	Complete	21
P3074R7	trivial unions (was std::uninitialized)	2025-02 (Hagenberg)
P1494R5	Partial program correctness	2025-02 (Hagenberg)
P2900R14	Contracts for C++	2025-02 (Hagenberg)
P3475R2	Defang and deprecate memory_order::consume	2025-02 (Hagenberg)
P2786R13	Trivial Relocatability For C++26	2025-02 (Hagenberg)
P3137R3	views::to_input	2025-02 (Hagenberg)
P0472R3	Put std::monostate in <utility>	2025-02 (Hagenberg)	Complete	21
P3349R1	Converting contiguous iterators to pointers	2025-02 (Hagenberg)
P3372R3	constexpr containers and adaptors	2025-02 (Hagenberg)	In Progress
P3378R2	constexpr exception types	2025-02 (Hagenberg)
P3441R2	Rename simd_split to simd_chunk	2025-02 (Hagenberg)
P3287R3	Exploration of namespaces for std::simd	2025-02 (Hagenberg)
P2976R1	Freestanding Library: algorithm, numeric, and random	2025-02 (Hagenberg)
P3430R3	simd issues: explicit, unsequenced, identity-element position, and members of disabled simd	2025-02 (Hagenberg)
P2663R7	Interleaved complex values support in std::simd	2025-02 (Hagenberg)
P2933R4	Extend <bit> header function with overloads for std::simd	2025-02 (Hagenberg)
P2846R6	reserve_hint: Eagerly reserving memory for not-quite-sized lazy ranges	2025-02 (Hagenberg)
P3471R4	Standard Library Hardening	2025-02 (Hagenberg)
P0447R28	Introduction of std::hive to the standard library	2025-02 (Hagenberg)
P3019R14	indirect and polymorphic: Vocabulary Types for Composite Class Design	2025-02 (Hagenberg)
P2996R13	Reflection for C++26	2025-06 (Sofia)
P3394R4	Annotations for Reflection	2025-06 (Sofia)
P3293R3	Splicing a base class subobject	2025-06 (Sofia)
P3491R3	define_static_{string,object,array}	2025-06 (Sofia)
P3096R12	Function Parameter Reflection in Reflection for C++26	2025-06 (Sofia)
P2988R12	std::optional<T&>	2025-06 (Sofia)
P3348R4	C++26 should refer to C23 not C17	2025-06 (Sofia)
P3037R6	constexpr std::shared_ptr and friends	2025-06 (Sofia)
P3284R4	write_env and unstoppable Sender Adaptors	2025-06 (Sofia)
P3179R9	Parallel Range Algorithms	2025-06 (Sofia)
P3709R2	Reconsider parallel ranges::rotate_copy and ranges::reverse_copy	2025-06 (Sofia)
P3641R0	Rename std::observable to std::observable_checkpoint, and add a feature-test macro	2025-06 (Sofia)
P3044R2	sub-string_view from string	2025-06 (Sofia)
P2876R3	Proposal to extend std::simd with more constructors and accessors	2025-06 (Sofia)
P3480R6	std::simd is a range	2025-06 (Sofia)
P2664R11	Extend std::simd with permutation API	2025-06 (Sofia)
P3691R1	Reconsider naming of the namespace for std::simd	2025-06 (Sofia)
P3383R3	mdspan.at()	2025-06 (Sofia)
P2927R3	Inspecting exception_ptr	2025-06 (Sofia)
P3748R0	Inspecting exception_ptr should be constexpr	2025-06 (Sofia)
P2830R10	Standardized Constexpr Type Ordering	2025-06 (Sofia)
P3570R2	optional variants in sender/receiver	2025-06 (Sofia)
P3481R5	std::execution::bulk() issues	2025-06 (Sofia)
P3433R1	Allocator Support for Operation States	2025-06 (Sofia)
P3149R11	async_scope - Creating scopes for non-sequential concurrency	2025-06 (Sofia)
P3682R0	Remove std::execution::split	2025-06 (Sofia)
P2079R10	Parallel scheduler	2025-06 (Sofia)
P3557R3	High-Quality Sender Diagnostics with Constexpr Exceptions	2025-06 (Sofia)
P3560R2	Error Handling in Reflection	2025-06 (Sofia)
P3503R3	Make type-erased allocator use in promise and packaged_task consistent	2025-06 (Sofia)
P3008R6	Atomic floating-point min/max	2025-06 (Sofia)
P3111R8	Atomic Reduction Operations	2025-06 (Sofia)
P3060R3	Add std::views::indices(n)	2025-06 (Sofia)
P2319R5	Prevent path presentation problems	2025-06 (Sofia)
P3223R2	Making std::istream::ignore less surprising	2025-06 (Sofia)
P2781R9	std::constant_wrapper	2025-06 (Sofia)
P3697R1	Minor additions to C++26 standard library hardening	2025-06 (Sofia)
P3552R3	Add a Coroutine Task Type	2025-06 (Sofia)
P1317R2	Remove return type deduction in std::apply	2025-06 (Sofia)

Library Working Group Issues Status

Issue #	Issue Name	Meeting	Status	First released version	Notes
LWG2994	Needless UB for basic_string and basic_string_view	2023-06 (Varna)	Complete	5
LWG3884	flat_foo is missing allocator-extended copy/move constructors	2023-06 (Varna)
LWG3885	op should be in [zombie.names]	2023-06 (Varna)	Nothing To Do
LWG3887	Version macro for allocate_at_least	2023-06 (Varna)	Complete	19
LWG3893	LWG 3661 broke atomic<shared_ptr<T>> a; a = nullptr;	2023-06 (Varna)
LWG3894	generator::promise_type::yield_value(ranges::elements_of<Rng, Alloc>) should not be noexcept	2023-06 (Varna)
LWG3903	span destructor is redundantly noexcept	2023-06 (Varna)	Complete	7
LWG3904	lazy_split_view::outer-iterator’s const-converting constructor isn’t setting trailing_empty_	2023-06 (Varna)
LWG3905	Type of std::fexcept_t	2023-06 (Varna)	Complete	3.4
LWG3912	enumerate_view::iterator::operator- should be noexcept	2023-06 (Varna)
LWG3914	Inconsistent template-head of ranges::enumerate_view	2023-06 (Varna)
LWG3915	Redundant paragraph about expression variations	2023-06 (Varna)
LWG3925	Concept formattable’s definition is incorrect	2023-06 (Varna)	Complete	17
LWG3927	Unclear preconditions for operator[] for sequence containers	2023-06 (Varna)	Nothing To Do
LWG3935	template<class X> constexpr complex& operator=(const complex<X>&) has no specification	2023-06 (Varna)	Complete	3.4
LWG3938	Cannot use std::expected monadic ops with move-only error_type	2023-06 (Varna)	Complete	18
LWG3940	std::expected<void, E>::value() also needs E to be copy constructible	2023-06 (Varna)	Complete	18
LWG2392	“character type” is used but not defined	2023-11 (Kona)
LWG3203	span element access invalidation	2023-11 (Kona)	Nothing To Do
LWG3305	any_cast<void>	2023-11 (Kona)	Complete	18
LWG3431	<=> for containers should require three_way_comparable<T> instead of <=>	2023-11 (Kona)
LWG3749	common_iterator should handle integer-class difference types	2023-11 (Kona)
LWG3809	Is std::subtract_with_carry_engine<uint16_t> supposed to work	2023-11 (Kona)
LWG3892	Incorrect formatting of nested ranges and tuples	2023-11 (Kona)	Complete	17
LWG3897	inout_ptr will not update raw pointer to 0	2023-11 (Kona)	Complete	19
LWG3946	The definition of const_iterator_t should be reworked	2023-11 (Kona)
LWG3947	Unexpected constraints on adjacent_transform_view::base()	2023-11 (Kona)
LWG3948	possibly-const-range and as-const-pointer should be noexcept	2023-11 (Kona)
LWG3949	std::atomic<bool>’s trivial destructor dropped in C++17 spec wording	2023-11 (Kona)
LWG3951	[expected.object.swap]: Using value() instead of has_value()	2023-11 (Kona)	Complete	16
LWG3953	iter_move for common_iterator and counted_iterator should return decltype(auto)	2023-11 (Kona)	Complete	20
LWG3957	[container.alloc.reqmts] The value category of v should be claimed	2023-11 (Kona)
LWG3965	Incorrect example in [format.string.escaped] p3 for formatting of combining characters	2023-11 (Kona)	Complete	19
LWG3970	[mdspan.syn] Missing definition of full_extent_t and full_extent	2023-11 (Kona)
LWG3973	Monadic operations should be ADL-proof	2023-11 (Kona)
LWG3974	mdspan::operator[] should not copy OtherIndexTypes	2023-11 (Kona)
LWG3987	Including <flat_foo> doesn’t provide std::begin/end	2023-11 (Kona)	Complete
LWG3990	Program-defined specializations of std::tuple and std::variant can’t be properly supported	2023-11 (Kona)	Complete	21
LWG4001	iota_view should provide empty	2023-11 (Kona)	Complete	19
LWG3767	codecvt<charN_t, char8_t, mbstate_t> incorrectly added to locale	2024-03 (Tokyo)
LWG3919	enumerate_view may invoke UB for sized common non-forward underlying ranges	2024-03 (Tokyo)
LWG3950	std::basic_string_view comparison operators are overspecified	2024-03 (Tokyo)	Complete	18
LWG3975	Specializations of basic_format_context should not be permitted	2024-03 (Tokyo)	Nothing To Do
LWG3984	ranges::to’s recursion branch may be ill-formed	2024-03 (Tokyo)	Complete	19
LWG4011	“Effects: Equivalent to return” in [span.elem]	2024-03 (Tokyo)	Nothing To Do
LWG4012	common_view::begin/end are missing the simple-view check	2024-03 (Tokyo)
LWG4013	lazy_split_view::outer-iterator::value_type should not provide default constructor	2024-03 (Tokyo)
LWG4016	container-insertable checks do not match what container-inserter does	2024-03 (Tokyo)	Complete	20
LWG4023	Preconditions of std::basic_streambuf::setg/setp	2024-03 (Tokyo)	Complete	19
LWG4025	Move assignment operator of std::expected<cv void, E> should not be conditionally deleted	2024-03 (Tokyo)	Complete	20
LWG4030	Clarify whether arithmetic expressions in [numeric.sat.func] are mathematical or C++	2024-03 (Tokyo)	Nothing To Do
LWG4031	bad_expected_access<void> member functions should be noexcept	2024-03 (Tokyo)	Complete	16
LWG4035	single_view should provide empty	2024-03 (Tokyo)	Complete	19
LWG4036	__alignof_is_defined is only implicitly specified in C++ and not yet deprecated	2024-03 (Tokyo)
LWG4037	Static data members of ctype_base are not yet required to be usable in constant expressions	2024-03 (Tokyo)
LWG4038	std::text_encoding::aliases_view should have constexpr iterators	2024-03 (Tokyo)
LWG4043	“ASCII” is not a registered character encoding	2024-03 (Tokyo)	Nothing To Do
LWG4045	tuple can create dangling references from tuple-like	2024-03 (Tokyo)
LWG4053	Unary call to std::views::repeat does not decay the argument	2024-03 (Tokyo)	Complete	19
LWG4054	Repeating a repeat_view should repeat the view	2024-03 (Tokyo)	Complete	19
LWG3944	Formatters converting sequences of char to sequences of wchar_t	2024-06 (St. Louis)	Complete	21
LWG4060	submdspan preconditions do not forbid creating invalid pointer	2024-06 (St. Louis)
LWG4061	Should std::basic_format_context be default-constructible/copyable/movable?	2024-06 (St. Louis)	Complete	19
LWG4071	reference_wrapper comparisons are not SFINAE-friendly	2024-06 (St. Louis)	Complete	19
LWG4074	compatible-joinable-ranges is underconstrained	2024-06 (St. Louis)	Complete	21
LWG4076	concat_view should be freestanding	2024-06 (St. Louis)
LWG4079	Missing Preconditions in concat_view::iterator`s conversion constructor	2024-06 (St. Louis)
LWG4082	views::concat(r) is well-formed when r is an output_range	2024-06 (St. Louis)
LWG4083	views::as_rvalue should reject non-input ranges	2024-06 (St. Louis)
LWG4096	views::iota(views::iota(0)) should be rejected	2024-06 (St. Louis)	Complete	22
LWG4098	views::adjacent<0> should reject non-forward ranges	2024-06 (St. Louis)
LWG4105	ranges::ends_with`s Returns misses difference casting	2024-06 (St. Louis)
LWG4106	basic_format_args should not be default-constructible	2024-06 (St. Louis)	Complete	19
LWG3216	Rebinding the allocator before calling construct/destroy in allocate_shared	2024-11 (Wrocław)
LWG3436	std::construct_at should support arrays	2024-11 (Wrocław)
LWG3886	Monad mo’ problems	2024-11 (Wrocław)
LWG3899	co_yielding elements of an lvalue generator is unnecessarily inefficient	2024-11 (Wrocław)
LWG3900	The allocator_arg_t overloads of generator::promise_type::operator new should not be constrained	2024-11 (Wrocław)
LWG3918	std::uninitialized_move/_n and guaranteed copy elision	2024-11 (Wrocław)
LWG4014	LWG 3809 changes behavior of some existing std::subtract_with_carry_engine code	2024-11 (Wrocław)
LWG4024	Underspecified destruction of objects created in std::make_shared_for_overwrite/std::allocate_shared_for_overwrite	2024-11 (Wrocław)	Complete	16
LWG4027	possibly-const-range should prefer returning const R&	2024-11 (Wrocław)
LWG4044	Confusing requirements for std::print on POSIX platforms	2024-11 (Wrocław)
LWG4064	Clarify that std::launder is not needed when using the result of std::memcpy	2024-11 (Wrocław)
LWG4072	std::optional comparisons: constrain harder	2024-11 (Wrocław)
LWG4084	std::fixed ignores std::uppercase	2024-11 (Wrocław)
LWG4085	ranges::generate_random’s helper lambda should specify the return type	2024-11 (Wrocław)
LWG4088	println ignores the locale imbued in std::ostream	2024-11 (Wrocław)	Complete	18
LWG4112	has-arrow should required operator->() to be const-qualified	2024-11 (Wrocław)
LWG4113	Disallow has_unique_object_representations<Incomplete[]>	2024-11 (Wrocław)	Complete
LWG4119	generator::promise_type::yield_value(ranges::elements_of<R, Alloc>)’s nested generator may be ill-formed	2024-11 (Wrocław)
LWG4124	Cannot format zoned_time with resolution coarser than seconds	2024-11 (Wrocław)
LWG4126	Some feature-test macros for fully freestanding features are not yet marked freestanding	2024-11 (Wrocław)
LWG4134	Issue with Philox algorithm specification	2024-11 (Wrocław)
LWG4135	The helper lambda of std::erase for list should specify return type as bool	2024-11 (Wrocław)	Complete	21
LWG4140	Useless default constructors for bit reference types	2024-11 (Wrocław)	Complete
LWG4141	Improve prohibitions on “additional storage”	2024-11 (Wrocław)
LWG4142	format_parse_context::check_dynamic_spec should require at least one type	2024-11 (Wrocław)
LWG4144	Disallow unique_ptr<T&, D>	2024-11 (Wrocław)
LWG4147	Precondition on inplace_vector::emplace	2024-11 (Wrocław)
LWG4148	unique_ptr::operator* should not allow dangling references	2024-11 (Wrocław)
LWG4153	Fix extra “-1” for philox_engine::max()	2024-11 (Wrocław)
LWG4154	The Mandates for std::packaged_task’s constructor from a callable entity should consider decaying	2024-11 (Wrocław)
LWG4157	The resolution of LWG3465 was damaged by P2167R3	2024-11 (Wrocław)	Complete	20
LWG4164	Missing guarantees for forward_list modifiers	2024-11 (Wrocław)	Complete	21
LWG4169	std::atomic<T>’s default constructor should be constrained	2024-11 (Wrocław)
LWG4170	contiguous_iterator should require to_address(I{})	2024-11 (Wrocław)
LWG3578	Iterator SCARYness in the context of associative container merging	2025-02 (Hagenberg)
LWG3956	chrono::parse uses from_stream as a customization point	2025-02 (Hagenberg)
LWG4172	unique_lock self-move-assignment is broken	2025-02 (Hagenberg)
LWG4175	get_env() specified in terms of as_const() but this doesn’t work with rvalue senders	2025-02 (Hagenberg)
LWG4179	Wrong range in [alg.search]	2025-02 (Hagenberg)
LWG4186	regex_traits::transform_primary mistakenly detects typeid of a function	2025-02 (Hagenberg)
LWG4189	cache_latest_view should be freestanding	2025-02 (Hagenberg)
LWG4191	P1467 changed the return type of pow(complex<float>, int)	2025-02 (Hagenberg)
LWG4196	Complexity of inplace_merge() is incorrect	2025-02 (Hagenberg)
LWG4198	schedule_from isn’t starting the schedule sender if decay-copying results throws	2025-06 (Sofia)
LWG4202	enable-sender should be a variable template	2025-06 (Sofia)
LWG4203	Constraints on get-state functions are incorrect	2025-06 (Sofia)
LWG4204	specification of as-sndr2(Sig) in [exec.let] is incomplete	2025-06 (Sofia)
LWG4205	let_[*].transform_env is specified in terms of the let_* sender itself instead of its child	2025-06 (Sofia)
LWG4208	Wording needs to ensure that in connect(sndr, rcvr) that rcvr expression is only evaluated once	2025-06 (Sofia)
LWG4209	default_domain::transform_env should be returning FWD-ENV(env)	2025-06 (Sofia)
LWG4188	ostream::sentry destructor should handle exceptions	2025-06 (Sofia)
LWG4200	The operation_state concept can be simplified	2025-06 (Sofia)
LWG4201	with-await-transform::await_transform should not use a deduced return type	2025-06 (Sofia)
LWG4217	Clarify mdspan layout mapping requirements for rank == 0	2025-06 (Sofia)
LWG4222	expected constructor from a single value missing a constraint	2025-06 (Sofia)	Complete	22
LWG4224	Philox engines should be freestanding	2025-06 (Sofia)
LWG4227	Missing noexcept operator in [exec.when.all]	2025-06 (Sofia)
LWG4231	datapar::chunk<N> should use simd-size-type instead of size_t	2025-06 (Sofia)
LWG4232	datapar::resize does not resize	2025-06 (Sofia)
LWG4233	The helper lambda of std::erase for hive should specify return type as bool	2025-06 (Sofia)
LWG4234	Including <hive> doesn’t provide std::begin/end	2025-06 (Sofia)
LWG4235	cache_latest_view and to_input_view miss reserve_hint	2025-06 (Sofia)
LWG4236	chunk_view::outer-iterator::value_type should provide reserve_hint	2025-06 (Sofia)
LWG4239	flat_map’s transparent comparator no longer works for string literals	2025-06 (Sofia)
LWG4242	ranges::distance does not work with volatile iterators	2025-06 (Sofia)
LWG4245	Operators that interact with counted_iterator and default_sentinel_t should be noexcept	2025-06 (Sofia)
LWG4247	Header <stdbit.h> is not yet freestanding	2025-06 (Sofia)
LWG3343	Ordering of calls to unlock() and notify_all() in Effects element of notify_all_at_thread_exit() should be reversed	Not Adopted Yet	Complete	16
LWG4139	§[time.zone.leap] recursive constraint in <=>	Not Adopted Yet	Complete	20
LWG3456	Pattern used by std::from_chars is underspecified (option B)	Not Adopted Yet	Complete	20
LWG3882	tuple relational operators have confused friendships	Not Adopted Yet	Complete	21	The comparsion operators are constrained harder than the proposed resolution. libstdc++ and MSVC STL do the same.