libc++ C++20 Status

Overview

In July 2017, the C++ standard committee created a draft for the next version of the C++ standard, initially known as “C++2a”. In September 2020, the C++ standard committee approved this draft, and sent it to ISO for approval as C++20.

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

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
P0463R1	Endian just Endian	2017-07 (Toronto)	Complete	7
P0674R1	Extending make_shared to Support Arrays	2017-07 (Toronto)	Complete	15
P0020R6	Floating Point Atomic	2017-11 (Albuquerque)	Complete	18	The feature-test macro was not set until LLVM 20.
P0053R7	C++ Synchronized Buffered Ostream	2017-11 (Albuquerque)	Complete	18
P0202R3	Add constexpr modifiers to functions in <algorithm> and <utility> Headers	2017-11 (Albuquerque)	Complete	12
P0415R1	Constexpr for std::complex	2017-11 (Albuquerque)	Complete	16
P0439R0	Make std::memory_order a scoped enumeration	2017-11 (Albuquerque)	Complete
P0457R2	String Prefix and Suffix Checking	2017-11 (Albuquerque)	Complete	6
P0550R2	Transformation Trait remove_cvref	2017-11 (Albuquerque)	Complete	6
P0600R1	nodiscard in the Library	2017-11 (Albuquerque)	Complete	16
P0616R0	de-pessimize legacy <numeric> algorithms with std::move	2017-11 (Albuquerque)	Complete	12
P0653R2	Utility to convert a pointer to a raw pointer	2017-11 (Albuquerque)	Complete	6
P0718R2	Atomic shared_ptr	2017-11 (Albuquerque)
P0767R1	Deprecate POD	2017-11 (Albuquerque)	Complete	21	It was previously erroneously marked as complete in LLVM 7.
P0768R1	Library Support for the Spaceship (Comparison) Operator	2017-11 (Albuquerque)	Complete
P0777R1	Treating Unnecessary decay	2017-11 (Albuquerque)	Complete	7
P0122R7	<span>	2018-03 (Jacksonville)	Complete	7
P0355R7	Extending chrono to Calendars and Time Zones	2018-03 (Jacksonville)	Partial		See the Github issue for detailed status
P0551R3	Thou Shalt Not Specialize std Function Templates!	2018-03 (Jacksonville)	Complete	11
P0753R2	Manipulators for C++ Synchronized Buffered Ostream	2018-03 (Jacksonville)
P0754R2	<version>	2018-03 (Jacksonville)	Complete	7
P0809R0	Comparing Unordered Containers	2018-03 (Jacksonville)	Nothing To Do
P0858R0	Constexpr iterator requirements	2018-03 (Jacksonville)	Complete	12
P0905R1	Symmetry for spaceship	2018-03 (Jacksonville)	Complete	7
P0966R1	string::reserve Should Not Shrink	2018-03 (Jacksonville)	Complete	12	It was previously erroneously marked as complete in version 8. See bug 45368
P0019R8	Atomic Ref	2018-06 (Rapperswil)	Complete	19
P0458R2	Checking for Existence of an Element in Associative Containers	2018-06 (Rapperswil)	Complete	13
P0475R1	LWG 2511: guaranteed copy elision for piecewise construction	2018-06 (Rapperswil)	Complete
P0476R2	Bit-casting object representations	2018-06 (Rapperswil)	Complete	14
P0528R3	The Curious Case of Padding Bits, Featuring Atomic Compare-and-Exchange	2018-06 (Rapperswil)
P0542R5	Support for contract based programming in C++	2018-06 (Rapperswil)	Nothing To Do	n/a	Pulled at the 2019-07 meeting in Cologne
P0556R3	Integral power-of-2 operations	2018-06 (Rapperswil)	Complete	9
P0619R4	Reviewing Deprecated Facilities of C++17 for C++20	2018-06 (Rapperswil)	Complete	20	Removed headers are still provided as an extension, but with deprecation warnings.
P0646R1	Improving the Return Value of Erase-Like Algorithms	2018-06 (Rapperswil)	Complete	10
P0722R3	Efficient sized delete for variable sized classes	2018-06 (Rapperswil)	Complete	9
P0758R1	Implicit conversion traits and utility functions	2018-06 (Rapperswil)	Complete
P0759R1	fpos Requirements	2018-06 (Rapperswil)	Complete	11
P0769R2	Add shift to <algorithm>	2018-06 (Rapperswil)	Complete	12
P0788R3	Standard Library Specification in a Concepts and Contracts World	2018-06 (Rapperswil)	Nothing To Do	n/a	Pulled at the 2019-07 meeting in Cologne
P0879R0	Constexpr for swap and swap related functions Also resolves LWG issue 2800.	2018-06 (Rapperswil)	Complete	13
P0887R1	The identity metafunction	2018-06 (Rapperswil)	Complete	8
P0892R2	P0892R2: explicit(bool)	2018-06 (Rapperswil)	Nothing To Do
P0898R3	Standard Library Concepts	2018-06 (Rapperswil)	Complete	13
P0935R0	Eradicating unnecessarily explicit default constructors from the standard library	2018-06 (Rapperswil)	Complete	12
P0941R2	Integrating feature-test macros into the C++ WD	2018-06 (Rapperswil)	In Progress
P1023R0	constexpr comparison operators for std::array	2018-06 (Rapperswil)	Complete	8
P1025R1	Update The Reference To The Unicode Standard	2018-06 (Rapperswil)
P1120R0	Consistency improvements for <=> and other comparison operators	2018-06 (Rapperswil)
P0318R1	unwrap_ref_decay and unwrap_reference	2018-11 (San Diego)	Complete	8
P0356R5	Simplified partial function application	2018-11 (San Diego)	Complete	13
P0357R3	reference_wrapper for incomplete types	2018-11 (San Diego)	Complete	8
P0482R6	char8_t: A type for UTF-8 characters and strings	2018-11 (San Diego)	Complete	16
P0487R1	Fixing operator>>(basic_istream&, CharT*) (LWG 2499)	2018-11 (San Diego)	Complete	8
P0591R4	Utility functions to implement uses-allocator construction	2018-11 (San Diego)	Partial		The changes in [mem.poly.allocator.mem] are missing
P0595R2	std::is_constant_evaluated()	2018-11 (San Diego)	Complete	9
P0602R4	variant and optional should propagate copy/move triviality	2018-11 (San Diego)	Complete	8
P0608R3	A sane variant converting constructor	2018-11 (San Diego)	Complete	9
P0655R1	visit<R>: Explicit Return Type for visit	2018-11 (San Diego)	Complete	12
P0771R1	std::function move constructor should be noexcept	2018-11 (San Diego)	Complete	6
P0896R4	The One Ranges Proposal	2018-11 (San Diego)	Complete	15
P0899R1	P0899R1 - LWG 3016 is not a defect	2018-11 (San Diego)	Nothing To Do
P0919R3	Heterogeneous lookup for unordered containers	2018-11 (San Diego)	Complete	12
P0972R0	<chrono> zero(), min(), and max() should be noexcept	2018-11 (San Diego)	Complete	8
P1006R1	Constexpr in std::pointer_traits	2018-11 (San Diego)	Complete	8
P1007R3	std::assume_aligned	2018-11 (San Diego)	Complete	15
P1020R1	Smart pointer creation with default initialization	2018-11 (San Diego)	Complete	16	The feature-test macro was not set until LLVM 20.
P1032R1	Misc constexpr bits	2018-11 (San Diego)	Complete	13
P1085R2	Should Span be Regular?	2018-11 (San Diego)	Complete	8
P1123R0	Editorial Guidance for merging P0019r8 and P0528r3	2018-11 (San Diego)
P1148R0	Cleaning up Clause 20	2018-11 (San Diego)
P1165R1	Make stateful allocator propagation more consistent for operator+(basic_string)	2018-11 (San Diego)	Complete	15
P1209R0	Adopt Consistent Container Erasure from Library Fundamentals 2 for C++20	2018-11 (San Diego)	Complete	8
P1210R0	P1210R0: Completing the Rebase of Library Fundamentals, Version 3, Working Draft	2018-11 (San Diego)	Nothing To Do
P1236R1	Alternative Wording for P0907R4 Signed Integers are Two’s Complement	2018-11 (San Diego)
P1248R1	Remove CommonReference requirement from StrictWeakOrdering (a.k.a Fixing Relations)	2018-11 (San Diego)	Complete	13
P1285R0	Improving Completeness Requirements for Type Traits	2018-11 (San Diego)
P1353R0	Missing feature test macros	2018-11 (San Diego)	Complete	19
P0339R6	polymorphic_allocator<> as a vocabulary type	2019-02 (Kona)	Complete	16
P0340R3	Making std::underlying_type SFINAE-friendly	2019-02 (Kona)	Complete	9
P0738R2	I Stream, You Stream, We All Stream for istream_iterator	2019-02 (Kona)
P0811R3	Well-behaved interpolation for numbers and pointers	2019-02 (Kona)	Complete	9
P0920R2	Precalculated hash values in lookup	2019-02 (Kona)	Nothing To Do		Reverted by P1661
P1001R2	Target Vectorization Policies from Parallelism V2 TS to C++20	2019-02 (Kona)	Complete	17
P1024R3	Usability Enhancements for std::span	2019-02 (Kona)	Complete	9
P1164R1	Make create_directory() Intuitive	2019-02 (Kona)	Complete	12
P1227R2	Signed ssize() functions, unsigned size() functions	2019-02 (Kona)	Complete	9
P1252R2	Ranges Design Cleanup	2019-02 (Kona)	Complete	15
P1286R2	Contra CWG DR1778	2019-02 (Kona)
P1357R1	Traits for [Un]bounded Arrays	2019-02 (Kona)	Complete	9
P1458R1	Mandating the Standard Library: Clause 16 - Language support library	2019-02 (Kona)	Complete	9
P1459R1	Mandating the Standard Library: Clause 18 - Diagnostics library	2019-02 (Kona)	Complete	9
P1462R1	Mandating the Standard Library: Clause 20 - Strings library	2019-02 (Kona)	Complete	9
P1463R1	Mandating the Standard Library: Clause 21 - Containers library	2019-02 (Kona)
P1464R1	Mandating the Standard Library: Clause 22 - Iterators library	2019-02 (Kona)	Complete	9
P0325R4	to_array from LFTS with updates	2019-07 (Cologne)	Complete	10
P0408R7	Efficient Access to basic_stringbuf’s Buffer	2019-07 (Cologne)	Complete	17
P0466R5	Layout-compatibility and Pointer-interconvertibility Traits	2019-07 (Cologne)
P0553R4	Bit operations	2019-07 (Cologne)	Complete	9
P0631R8	Math Constants	2019-07 (Cologne)	Complete	11
P0645R10	Text Formatting	2019-07 (Cologne)	Complete	14	The implementation was complete since LLVM 14, but the feature-test macro was not set until LLVM 19
P0660R10	Stop Token and Joining Thread, Rev 10.	2019-07 (Cologne)	Complete	20	The feature was implemented since LLVM 18 but was guarded behind -fexperimental-library.
P0784R7	More constexpr containers	2019-07 (Cologne)	Complete	12
P0980R1	Making std::string constexpr	2019-07 (Cologne)	Complete	15
P1004R2	Making std::vector constexpr	2019-07 (Cologne)	Complete	15
P1035R7	Input Range Adaptors	2019-07 (Cologne)	Complete	16
P1065R2	Constexpr INVOKE	2019-07 (Cologne)	Complete	12
P1135R6	The C++20 Synchronization Library	2019-07 (Cologne)	Complete	11
P1207R4	Movability of Single-pass Iterators	2019-07 (Cologne)	Complete	15
P1208R6	Adopt source_location for C++20	2019-07 (Cologne)	Complete	16
P1355R2	Exposing a narrow contract for ceil2	2019-07 (Cologne)	Complete	9
P1361R2	Integration of chrono with text formatting	2019-07 (Cologne)	Complete	21
P1423R3	char8_t backward compatibility remediation	2019-07 (Cologne)	Complete	15
P1424R1	‘constexpr’ feature macro concerns	2019-07 (Cologne)	Nothing To Do		Superseded by P1902
P1466R3	Miscellaneous minor fixes for chrono	2019-07 (Cologne)	Partial
P1474R1	Helpful pointers for ContiguousIterator	2019-07 (Cologne)	Complete	15
P1502R1	Standard library header units for C++20	2019-07 (Cologne)
P1522R1	Iterator Difference Type and Integer Overflow	2019-07 (Cologne)	Complete	15
P1523R1	Views and Size Types	2019-07 (Cologne)	Complete	15
P1612R1	Relocate Endian’s Specification	2019-07 (Cologne)	Complete	10
P1614R2	The Mothership has Landed	2019-07 (Cologne)	Complete	19	std::strong_order(long double, long double) is partly implemented.
P1638R1	basic_istream_view::iterator should not be copyable	2019-07 (Cologne)	Complete	16
P1643R1	Add wait/notify to atomic_ref	2019-07 (Cologne)	Complete	19
P1644R0	Add wait/notify to atomic<shared_ptr>	2019-07 (Cologne)
P1650R0	Output std::chrono::days with ‘d’ suffix	2019-07 (Cologne)	Complete	16
P1651R0	bind_front should not unwrap reference_wrapper	2019-07 (Cologne)	Complete	13
P1652R1	Printf corner cases in std::format	2019-07 (Cologne)	Complete	14
P1661R1	Remove dedicated precalculated hash lookup interface	2019-07 (Cologne)	Nothing To Do
P1754R1	Rename concepts to standard_case for C++20, while we still can	2019-07 (Cologne)	Complete	15
P0883R2	Fixing Atomic Initialization	2019-11 (Belfast)	Complete	14	shared_ptr and floating-point changes weren’t applied as they themselves aren’t implemented yet. Also, ATOMIC_FLAG_INIT was marked deprecated in version 14, but was undeprecated with the implementation of LWG3659 in version 15.
P1391R4	Range constructor for std::string_view	2019-11 (Belfast)	Complete	14
P1394R4	Range constructor for std::span	2019-11 (Belfast)	Complete	14
P1456R1	Move-only views	2019-11 (Belfast)	Complete	15
P1622R3	Mandating the Standard Library: Clause 32 - Thread support library	2019-11 (Belfast)
P1645R1	constexpr for numeric algorithms	2019-11 (Belfast)	Complete	12
P1686R2	Mandating the Standard Library: Clause 27 - Time library	2019-11 (Belfast)
P1690R1	Refinement Proposal for P0919 Heterogeneous lookup for unordered containers	2019-11 (Belfast)	Complete	12
P1716R3	ranges compare algorithm are over-constrained	2019-11 (Belfast)	Complete	15
P1718R2	Mandating the Standard Library: Clause 25 - Algorithms library	2019-11 (Belfast)
P1719R2	Mandating the Standard Library: Clause 26 - Numerics library	2019-11 (Belfast)
P1720R2	Mandating the Standard Library: Clause 28 - Localization library	2019-11 (Belfast)
P1721R2	Mandating the Standard Library: Clause 29 - Input/Output library	2019-11 (Belfast)
P1722R2	Mandating the Standard Library: Clause 30 - Regular Expression library	2019-11 (Belfast)
P1723R2	Mandating the Standard Library: Clause 31 - Atomics library	2019-11 (Belfast)
P1855R0	Make <compare> freestanding	2019-11 (Belfast)
P1862R1	Ranges adaptors for non-copyable iterators	2019-11 (Belfast)	Complete	16
P1865R1	Add max() to latch and barrier	2019-11 (Belfast)	Complete	11
P1869R1	Rename ‘condition_variable_any’ interruptible wait methods	2019-11 (Belfast)	Complete	18
P1870R1	forwarding-range is too subtle	2019-11 (Belfast)	Complete	15
P1871R1	Concept traits should be named after concepts	2019-11 (Belfast)	Complete	14
P1872R0	span should have size_type, not index_type	2019-11 (Belfast)	Complete	10
P1878R1	Constraining Readable Types	2019-11 (Belfast)	Complete	15
P1892R1	Extended locale-specific presentation specifiers for std::format	2019-11 (Belfast)	Complete	14
P1902R1	Missing feature-test macros 2018-2019	2019-11 (Belfast)
P1959R0	Remove std::weak_equality and std::strong_equality	2019-11 (Belfast)	Nothing To Do
P1960R0	NB Comment Changes Reviewed by SG1	2019-11 (Belfast)
P1961R0	Harmonizing the definitions of total order for pointers	2019-11 (Belfast)
P1965R0	Blanket Wording for Specifying “Hidden Friends”	2019-11 (Belfast)
P0586R2	Safe integral comparisons	2020-02 (Prague)	Complete	13
P0593R6	Implicit creation of objects for low-level object manipulation	2020-02 (Prague)
P1115R3	Improving the Return Value of Erase-Like Algorithms II: Free erase/erase if	2020-02 (Prague)	Complete	11
P1243R4	Rangify New Algorithms	2020-02 (Prague)	Complete	15
P1460R1	Mandating the Standard Library: Clause 20 - Utilities library	2020-02 (Prague)
P1739R4	Avoid template bloat for safe_ranges in combination with “subrange-y” view adaptors	2020-02 (Prague)	Complete	15
P1831R1	Deprecating volatile: library	2020-02 (Prague)
P1868R2	width: clarifying units of width and precision in std::format	2020-02 (Prague)	Complete	14
P1956R1	On the names of low-level bit manipulation functions	2020-02 (Prague)	Complete	12
P1957R2	Converting from T* to bool should be considered narrowing (re: US 212)	2020-02 (Prague)	Complete	18
P1963R0	P1963R0: Fixing US 313	2020-02 (Prague)	Nothing To Do
P1964R2	Wording for boolean-testable	2020-02 (Prague)	Complete	13
P1970R2	Consistency for size() functions: Add ranges::ssize	2020-02 (Prague)	Complete	15
P1973R1	Rename “_default_init” Functions, Rev1	2020-02 (Prague)	Complete	16	The feature-test macro was not set until LLVM 20.
P1976R2	Fixed-size span construction from dynamic range	2020-02 (Prague)	Complete	11
P1981R0	Rename leap to leap_second	2020-02 (Prague)	Complete	19
P1982R0	Rename link to time_zone_link	2020-02 (Prague)	Complete	19
P1983R0	Wording for GB301, US296, US292, US291, and US283	2020-02 (Prague)	Complete	15
P1994R1	elements_view needs its own sentinel	2020-02 (Prague)	Complete	16
P2002R1	Defaulted comparison specification cleanups	2020-02 (Prague)	Complete	7
P2045R1	P2045R1: Missing Mandates for the standard library	2020-02 (Prague)	Nothing To Do
P2085R0	Consistent defaulted comparisons	2020-02 (Prague)
P2091R0	Issues with range access CPOs	2020-02 (Prague)	Complete	15
P2101R0	P2101R0: ‘Models’ subsumes ‘satisfies’ (Wording for US298 and US300)	2020-02 (Prague)	Nothing To Do
P2102R0	Make ‘implicit expression variations’ more explicit (Wording for US185)	2020-02 (Prague)	Complete	15
P2106R0	Alternative wording for GB315 and GB316	2020-02 (Prague)	Complete	15
P2116R0	Remove tuple-like protocol support from fixed-extent span	2020-02 (Prague)	Complete	11
P2231R1	Missing constexpr in std::optional and std::variant	2021-06 (Virtual)	Complete	19	Changes of feature-test macros are completed in LLVM 20.
P2325R3	Views should not be required to be default constructible	2021-06 (Virtual)	Complete	16
P2210R2	Superior String Splitting	2021-06 (Virtual)	Complete	16
P2216R3	std::format improvements	2021-06 (Virtual)	Complete	15
P2281R1	Clarifying range adaptor objects	2021-06 (Virtual)	Complete	14
P2328R1	join_view should join all views of ranges	2021-06 (Virtual)	Complete	15
P2367R0	Remove misuses of list-initialization from Clause 24	2021-06 (Virtual)	Complete	15
P2372R3	Fixing locale handling in chrono formatters	2021-10 (Virtual)	In Progress
P2415R2	What is a view	2021-10 (Virtual)	Complete	14
P2418R2	Add support for std::generator-like types to std::format	2021-10 (Virtual)	Complete	15
P2432R1	Fix istream_view	2021-10 (Virtual)	Complete	16

Library Working Group Issues Status

Issue #	Issue Name	Meeting	Status	First released version	Notes
LWG2070	allocate_shared should use allocator_traits<A>::construct	2017-07 (Toronto)	Nothing To Do		Resolved by P0674R1
LWG2444	Inconsistent complexity for std::sort_heap	2017-07 (Toronto)	Nothing To Do
LWG2593	Moved-from state of Allocators	2017-07 (Toronto)	Nothing To Do
LWG2597	std::log misspecified for complex numbers	2017-07 (Toronto)
LWG2783	stack::emplace() and queue::emplace() should return decltype(auto)	2017-07 (Toronto)	Complete
LWG2932	Constraints on parallel algorithm implementations are underspecified	2017-07 (Toronto)
LWG2937	Is equivalent("existing_thing", "not_existing_thing") an error	2017-07 (Toronto)	Complete
LWG2940	result_of specification also needs a little cleanup	2017-07 (Toronto)	Nothing To Do
LWG2942	LWG 2873’s resolution missed weak_ptr::owner_before	2017-07 (Toronto)	Complete
LWG2954	Specialization of the convenience variable templates should be prohibited	2017-07 (Toronto)	Complete
LWG2961	Bad postcondition for set_default_resource	2017-07 (Toronto)	Complete	16
LWG2966	Incomplete resolution of US 74	2017-07 (Toronto)	Nothing To Do
LWG2974	Diagnose out of bounds tuple_element/variant_alternative	2017-07 (Toronto)	Complete
LWG2779	[networking.ts] Relax requirements on buffer sequence iterators	2017-11 (Albuquerque)	Nothing To Do
LWG2870	Default value of parameter theta of polar should be dependent	2017-11 (Albuquerque)	Complete
LWG2935	What should create_directories do when p already exists but is not a directory?	2017-11 (Albuquerque)	Nothing To Do
LWG2941	[thread.req.timing] wording should apply to both member and namespace-level functions	2017-11 (Albuquerque)	Nothing To Do
LWG2944	LWG 2905 accidentally removed requirement that construction of the deleter doesn’t throw an exception	2017-11 (Albuquerque)	Nothing To Do
LWG2945	Order of template parameters in optional comparisons	2017-11 (Albuquerque)	Complete
LWG2948	unique_ptr does not define operator<< for stream output	2017-11 (Albuquerque)	Complete
LWG2950	std::byte operations are misspecified	2017-11 (Albuquerque)	Complete
LWG2952	iterator_traits should work for pointers to cv T	2017-11 (Albuquerque)	Complete
LWG2953	LWG 2853 should apply to deque::erase too	2017-11 (Albuquerque)	Complete
LWG2958	Moves improperly defined as deleted	2017-11 (Albuquerque)	Complete
LWG2964	Apparently redundant requirement for dynamic_pointer_cast	2017-11 (Albuquerque)
LWG2965	Non-existing path::native_string() in filesystem_error::what() specification	2017-11 (Albuquerque)	Nothing To Do
LWG2972	What is is_trivially_destructible_v<int>?	2017-11 (Albuquerque)	Complete
LWG2976	Dangling uses_allocator specialization for packaged_task	2017-11 (Albuquerque)	Complete	20	Originally implemented in LLVM 6 but reverted later. Old documentation incorrectly said it was implemented.
LWG2977	unordered_meow::merge() has incorrect Throws: clause	2017-11 (Albuquerque)	Nothing To Do
LWG2978	Hash support for pmr::string and friends	2017-11 (Albuquerque)	Complete	16
LWG2979	aligned_union should require complete object types	2017-11 (Albuquerque)	Complete
LWG2980	Cannot compare_exchange empty pointers	2017-11 (Albuquerque)
LWG2981	Remove redundant deduction guides from standard library	2017-11 (Albuquerque)	Nothing To Do
LWG2982	Making size_type consistent in associative container deduction guides	2017-11 (Albuquerque)
LWG2988	Clause 32 cleanup missed one typename	2017-11 (Albuquerque)	Complete	13
LWG2993	reference_wrapper<T> conversion from T&&	2017-11 (Albuquerque)	Complete	13
LWG2998	Requirements on function objects passed to {forward_,}list-specific algorithms	2017-11 (Albuquerque)	Nothing To Do
LWG3001	weak_ptr::element_type needs remove_extent_t	2017-11 (Albuquerque)	Complete	14
LWG3024	variant’s copies must be deleted instead of disabled via SFINAE	2017-11 (Albuquerque)	Complete
LWG2164	What are the semantics of vector.emplace(vector.begin(), vector.back())?	2018-03 (Jacksonville)	Complete
LWG2243	istream::putback problem	2018-03 (Jacksonville)	Complete
LWG2816	resize_file has impossible postcondition	2018-03 (Jacksonville)	Nothing To Do
LWG2843	Unclear behavior of std::pmr::memory_resource::do_allocate()	2018-03 (Jacksonville)	Complete
LWG2849	Why does !is_regular_file(from) cause copy_file to report a “file already exists” error?	2018-03 (Jacksonville)	Nothing To Do
LWG2851	std::filesystem enum classes are now underspecified	2018-03 (Jacksonville)	Nothing To Do
LWG2946	LWG 2758’s resolution missed further corrections	2018-03 (Jacksonville)	Complete
LWG2969	polymorphic_allocator::construct() shouldn’t pass resource()	2018-03 (Jacksonville)	Complete
LWG2975	Missing case for pair construction in scoped and polymorphic allocators	2018-03 (Jacksonville)
LWG2989	path‘s stream insertion operator lets you insert everything under the sun	2018-03 (Jacksonville)	Complete
LWG3000	monotonic_memory_resource::do_is_equal uses dynamic_cast unnecessarily	2018-03 (Jacksonville)	Complete	16
LWG3002	[networking.ts] basic_socket_acceptor::is_open() isn’t noexcept	2018-03 (Jacksonville)	Nothing To Do
LWG3004	§[string.capacity] and §[vector.capacity] should specify time complexity for capacity()	2018-03 (Jacksonville)	Nothing To Do
LWG3005	Destruction order of arrays by make_shared/allocate_shared only recommended?	2018-03 (Jacksonville)
LWG3007	allocate_shared should rebind allocator to cv-unqualified value_type for construction	2018-03 (Jacksonville)
LWG3009	Including <string_view> doesn’t provide std::size/empty/data	2018-03 (Jacksonville)	Complete
LWG3010	[networking.ts] uses_executor says “if a type T::executor_type exists”	2018-03 (Jacksonville)	Nothing To Do
LWG3013	(recursive_)directory_iterator construction and traversal should not be noexcept	2018-03 (Jacksonville)	Complete
LWG3014	More noexcept issues with filesystem operations	2018-03 (Jacksonville)	Complete
LWG3015	copy_options::*unspecified* underspecified	2018-03 (Jacksonville)	Nothing To Do
LWG3017	list splice functions should use addressof	2018-03 (Jacksonville)	Complete
LWG3020	[networking.ts] Remove spurious nested value_type buffer sequence requirement	2018-03 (Jacksonville)	Nothing To Do
LWG3026	filesystem::weakly_canonical still defined in terms of canonical(p, base)	2018-03 (Jacksonville)	Complete
LWG3030	Who shall meet the requirements of try_lock?	2018-03 (Jacksonville)	Nothing To Do
LWG3034	P0767R1 breaks previously-standard-layout types	2018-03 (Jacksonville)	Complete
LWG3035	std::allocator‘s constructors should be constexpr	2018-03 (Jacksonville)	Complete
LWG3039	Unnecessary decay in thread and packaged_task	2018-03 (Jacksonville)	Complete
LWG3041	Unnecessary decay in reference_wrapper	2018-03 (Jacksonville)	Complete
LWG3042	is_literal_type_v should be inline	2018-03 (Jacksonville)	Complete
LWG3043	Bogus postcondition for filesystem_error constructor	2018-03 (Jacksonville)	Complete
LWG3045	atomic<floating-point> doesn’t have value_type or difference_type	2018-03 (Jacksonville)	Complete	18
LWG3048	transform_reduce(exec, first1, last1, first2, init) discards execution policy	2018-03 (Jacksonville)	Complete	17
LWG3051	Floating point classifications were inadvertently changed in P0175	2018-03 (Jacksonville)	Nothing To Do
LWG3075	basic_string needs deduction guides from basic_string_view	2018-03 (Jacksonville)	Complete
LWG2139	What is a user-defined type?	2018-06 (Rapperswil)
LWG2970	Return type of std::visit misspecified	2018-06 (Rapperswil)	Complete	11
LWG3058	Parallel adjacent_difference shouldn’t require creating temporaries	2018-06 (Rapperswil)
LWG3062	Unnecessary decay_t in is_execution_policy_v should be remove_cvref_t	2018-06 (Rapperswil)	Complete	17
LWG3067	recursive_directory_iterator::pop must invalidate	2018-06 (Rapperswil)	Nothing To Do
LWG3071	[networking.ts] read_until still refers to “input sequence”	2018-06 (Rapperswil)	Nothing To Do
LWG3074	Non-member functions for valarray should only deduce from the valarray	2018-06 (Rapperswil)
LWG3076	basic_string CTAD ambiguity	2018-06 (Rapperswil)	Complete
LWG3079	LWG 2935 forgot to fix the existing_p overloads of create_directory	2018-06 (Rapperswil)	Nothing To Do
LWG3080	Floating point from_chars pattern specification breaks round-tripping	2018-06 (Rapperswil)
LWG3083	What should ios::iword(-1) do?	2018-06 (Rapperswil)	Nothing To Do
LWG3094	[time.duration.io]p4 makes surprising claims about encoding	2018-06 (Rapperswil)
LWG3100	Unnecessary and confusing “empty span” wording	2018-06 (Rapperswil)	Nothing To Do
LWG3102	Clarify span iterator and const_iterator behavior	2018-06 (Rapperswil)	Complete
LWG3104	Fixing duration division	2018-06 (Rapperswil)	Complete
LWG2183	Muddled allocator requirements for match_results constructors	2018-11 (San Diego)	Complete
LWG2184	Muddled allocator requirements for match_results assignments	2018-11 (San Diego)	Complete
LWG2412	promise::set_value() and promise::get_future() should not race	2018-11 (San Diego)
LWG2499	operator>>(basic_istream&, CharT*) makes it hard to avoid buffer overflows	2018-11 (San Diego)	Nothing To Do		Resolved by P0487R1
LWG2682	filesystem::copy() won’t create a symlink to a directory	2018-11 (San Diego)	Nothing To Do
LWG2697	[concurr.ts] Behavior of future/shared_future unwrapping constructor when given an invalid future	2018-11 (San Diego)
LWG2797	Trait precondition violations	2018-11 (San Diego)	Nothing To Do		Resolved by P1285R0
LWG2936	Path comparison is defined in terms of the generic format	2018-11 (San Diego)	Complete
LWG2943	Problematic specification of the wide version of basic_filebuf::open	2018-11 (San Diego)	Nothing To Do
LWG2960	[fund.ts.v3] nonesuch is insufficiently useless	2018-11 (San Diego)	Complete
LWG2995	basic_stringbuf default constructor forbids it from using SSO capacity	2018-11 (San Diego)	Complete	20
LWG2996	Missing rvalue overloads for shared_ptr operations	2018-11 (San Diego)	Complete	17
LWG3008	make_shared (sub)object destruction semantics are not specified	2018-11 (San Diego)	Complete	16
LWG3022	is_convertible<derived*, base*> may lead to ODR	2018-11 (San Diego)	Nothing To Do		Resolved by P1285R0
LWG3025	Map-like container deduction guides should use pair<Key, T>, not pair<const Key, T>	2018-11 (San Diego)	Complete
LWG3031	Algorithms and predicates with non-const reference arguments	2018-11 (San Diego)
LWG3037	polymorphic_allocator and incomplete types	2018-11 (San Diego)	Complete	16
LWG3038	polymorphic_allocator::allocate should not allow integer overflow to create vulnerabilities	2018-11 (San Diego)	Complete	14
LWG3054	uninitialized_copy appears to not be able to meet its exception-safety guarantee	2018-11 (San Diego)	Nothing To Do
LWG3065	LWG 2989 missed that all path‘s other operators should be hidden friends as well	2018-11 (San Diego)	Complete
LWG3096	path::lexically_relative is confused by trailing slashes	2018-11 (San Diego)	Complete
LWG3116	OUTERMOST_ALLOC_TRAITS needs remove_reference_t	2018-11 (San Diego)
LWG3122	__cpp_lib_chrono_udls was accidentally dropped	2018-11 (San Diego)	Complete
LWG3127	basic_osyncstream::rdbuf needs a const_cast	2018-11 (San Diego)	Complete	18
LWG3128	strstream::rdbuf needs a const_cast	2018-11 (San Diego)	Nothing To Do
LWG3129	regex_token_iterator constructor uses wrong pointer arithmetic	2018-11 (San Diego)
LWG3130	§[input.output] needs many addressof	2018-11 (San Diego)	Complete	20
LWG3131	addressof all the things	2018-11 (San Diego)
LWG3132	Library needs to ban macros named expects or ensures	2018-11 (San Diego)	Nothing To Do
LWG3134	[fund.ts.v3] LFTSv3 contains extraneous [meta] variable templates that should have been deleted by P09961	2018-11 (San Diego)	Nothing To Do		Resolved by P1210R0
LWG3137	Header for __cpp_lib_to_chars	2018-11 (San Diego)	Complete
LWG3140	COMMON_REF is unimplementable as specified	2018-11 (San Diego)	Nothing To Do
LWG3145	file_clock breaks ABI for C++17 implementations	2018-11 (San Diego)	Complete
LWG3147	Definitions of “likely” and “unlikely” are likely to cause problems	2018-11 (San Diego)	Nothing To Do
LWG3148	<concepts> should be freestanding	2018-11 (San Diego)
LWG3153	Common and common_type have too little in common	2018-11 (San Diego)	Complete	13
LWG3154	Common and CommonReference have a common defect	2018-11 (San Diego)	Nothing To Do
LWG3012	atomic<T> is unimplementable for non-is_trivially_copy_constructible T	2019-02 (Kona)
LWG3040	basic_string_view::starts_with Effects are incorrect	2019-02 (Kona)	Complete
LWG3077	(push|emplace)_back should invalidate the end iterator	2019-02 (Kona)	Nothing To Do
LWG3087	One final &x in §[list.ops]	2019-02 (Kona)	Nothing To Do
LWG3101	span‘s Container constructors need another constraint	2019-02 (Kona)	Complete
LWG3112	system_error and filesystem_error constructors taking a string may not be able to meet their postconditions	2019-02 (Kona)	Nothing To Do
LWG3119	Program-definedness of closure types	2019-02 (Kona)	Nothing To Do
LWG3133	Modernizing numeric type requirements	2019-02 (Kona)
LWG3144	span does not have a const_pointer typedef	2019-02 (Kona)	Complete
LWG3173	Enable CTAD for ref-view	2019-02 (Kona)	Complete	15
LWG3179	subrange should always model Range	2019-02 (Kona)	Nothing To Do
LWG3180	Inconsistently named return type for ranges::minmax_element	2019-02 (Kona)	Complete	15
LWG3182	Specification of Same could be clearer	2019-02 (Kona)	Complete	15
LWG2899	is_(nothrow_)move_constructible and tuple, optional and unique_ptr	2019-07 (Cologne)
LWG3055	path::operator+=(*single-character*) misspecified	2019-07 (Cologne)	Complete	7
LWG3158	tuple(allocator_arg_t, const Alloc&) should be conditionally explicit	2019-07 (Cologne)	Complete	10
LWG3169	ranges permutation generators discard useful information	2019-07 (Cologne)	Complete	15
LWG3183	Normative permission to specialize Ranges variable templates	2019-07 (Cologne)	Nothing To Do
LWG3184	Inconsistencies in bind_front wording	2019-07 (Cologne)	Complete	13
LWG3185	Uses-allocator construction functions missing constexpr and noexcept	2019-07 (Cologne)	Complete	16
LWG3186	ranges removal, partition, and partial_sort_copy algorithms discard useful information	2019-07 (Cologne)	Complete	15
LWG3187	P0591R4 reverted DR 2586 fixes to scoped_allocator_adaptor::construct()	2019-07 (Cologne)
LWG3191	std::ranges::shuffle synopsis does not match algorithm definition	2019-07 (Cologne)	Complete	15
LWG3196	std::optional<T> is ill-formed is T is an array	2019-07 (Cologne)	Complete
LWG3198	Bad constraint on std::span::span()	2019-07 (Cologne)	Complete
LWG3199	istream >> bitset<0> fails	2019-07 (Cologne)	Complete	10
LWG3202	P0318R1 was supposed to be revised	2019-07 (Cologne)	Complete
LWG3206	year_month_day conversion to sys_days uses not-existing member function	2019-07 (Cologne)	Complete
LWG3208	Boolean‘s expression requirements are ordered inconsistently	2019-07 (Cologne)	Nothing To Do
LWG3209	Expression in year::ok() returns clause is ill-formed	2019-07 (Cologne)	Complete
LWG3231	year_month_day_last::day specification does not cover !ok() values	2019-11 (Belfast)	Nothing To Do
LWG3225	zoned_time converting constructor shall not be noexcept	2019-11 (Belfast)	Complete	19
LWG3190	std::allocator::allocate sometimes returns too little storage	2019-11 (Belfast)	Complete	14
LWG3218	Modifier for %d parse flag does not match POSIX and format specification	2019-11 (Belfast)
LWG3224	zoned_time constructor from TimeZonePtr does not specify initialization of tp_	2019-11 (Belfast)	Complete	19
LWG3230	Format specifier %y/%Y is missing locale alternative versions	2019-11 (Belfast)	Complete	16
LWG3232	Inconsistency in zoned_time deduction guides	2019-11 (Belfast)	Complete	19
LWG3222	P0574R1 introduced preconditions on non-existent parameters	2019-11 (Belfast)
LWG3221	Result of year_month arithmetic with months is ambiguous	2019-11 (Belfast)	Complete	8
LWG3235	parse manipulator without abbreviation is not callable	2019-11 (Belfast)
LWG3246	LWG3246: What are the constraints on the template parameter of basic_format_arg?	2019-11 (Belfast)	Nothing To Do
LWG3253	basic_syncbuf::basic_syncbuf() should not be explicit	2019-11 (Belfast)	Complete	20
LWG3245	Unnecessary restriction on '%p' parse specifier	2019-11 (Belfast)
LWG3244	Constraints for Source in §[fs.path.req] insufficiently constrainty	2019-11 (Belfast)
LWG3241	chrono-spec grammar ambiguity in §[time.format]	2019-11 (Belfast)	Complete	16
LWG3257	Missing feature testing macro update from P0858	2019-11 (Belfast)	Complete	12
LWG3256	Feature testing macro for constexpr algorithms	2019-11 (Belfast)	Complete	13
LWG3273	Specify weekday_indexed to range of [0, 7]	2019-11 (Belfast)	Complete	16
LWG3070	path::lexically_relative causes surprising results if a filename can also be a root-name	2019-11 (Belfast)
LWG3266	to_chars(bool) should be deleted	2019-11 (Belfast)	Complete	14
LWG3272	%I%p should parse/format duration since midnight	2019-11 (Belfast)
LWG3259	The definition of constexpr iterators should be adjusted	2019-11 (Belfast)	Nothing To Do
LWG3103	Errors in taking subview of span should be ill-formed where possible	2019-11 (Belfast)	Complete	11
LWG3274	Missing feature test macro for <span>	2019-11 (Belfast)	Complete	11
LWG3276	Class split_view::outer_iterator::value_type should inherit from view_interface	2019-11 (Belfast)	Complete	15
LWG3277	Pre-increment on prvalues is not a requirement of weakly_incrementable	2019-11 (Belfast)	Nothing To Do
LWG3149	DefaultConstructible should require default initialization	2019-11 (Belfast)	Complete	13
LWG1203	More useful rvalue stream insertion	2020-02 (Prague)	Complete	12
LWG2859	Definition of reachable in [ptr.launder] misses pointer arithmetic from pointer-interconvertible object	2020-02 (Prague)
LWG3018	shared_ptr of function type	2020-02 (Prague)	Nothing To Do
LWG3050	Conversion specification problem in chrono::duration constructor	2020-02 (Prague)	Complete	19
LWG3141	CopyConstructible doesn’t preserve source values	2020-02 (Prague)	Nothing To Do
LWG3150	UniformRandomBitGenerator should validate min and max	2020-02 (Prague)	Complete	13
LWG3175	The CommonReference requirement of concept SwappableWith is not satisfied in the example	2020-02 (Prague)	Complete	13
LWG3194	ConvertibleTo prose does not match code	2020-02 (Prague)	Complete	13
LWG3200	midpoint should not constrain T is complete	2020-02 (Prague)	Nothing To Do
LWG3201	lerp should be marked as noexcept	2020-02 (Prague)	Complete
LWG3226	zoned_time constructor from string_view should accept zoned_time<Duration2, TimeZonePtr2>	2020-02 (Prague)	Complete	19
LWG3233	Broken requirements for shared_ptr converting constructors	2020-02 (Prague)	Complete	19
LWG3237	LWG 3038 and 3190 have inconsistent PRs	2020-02 (Prague)	Complete	16
LWG3238	Insufficiently-defined behavior of std::function deduction guides	2020-02 (Prague)	Nothing To Do
LWG3242	std::format: missing rules for arg-id in width and precision	2020-02 (Prague)	Complete	14
LWG3243	std::format and negative zeroes	2020-02 (Prague)	Complete	14
LWG3247	ranges::iter_move should perform ADL-only lookup of iter_move	2020-02 (Prague)	Complete	15
LWG3248	std::format #b, #B, #o, #x, and #X presentation types misformat negative numbers	2020-02 (Prague)	Complete	14
LWG3250	std::format: # (alternate form) for NaN and inf	2020-02 (Prague)	Complete	14
LWG3251	Are std::format alignment specifiers applied to string arguments?	2020-02 (Prague)	Complete	14
LWG3252	Parse locale’s aware modifiers for commands are not consistent with POSIX spec	2020-02 (Prague)
LWG3254	Strike stop_token‘s operator!=	2020-02 (Prague)	Complete	17
LWG3255	span‘s array constructor is too strict	2020-02 (Prague)	Complete
LWG3260	year_month* arithmetic rejects durations convertible to years	2020-02 (Prague)
LWG3262	Formatting of negative durations is not specified	2020-02 (Prague)	Complete	16
LWG3264	sized_range and ranges::size redundantly use disable_sized_range	2020-02 (Prague)	Complete	15
LWG3269	Parse manipulators do not specify the result of the extraction from stream	2020-02 (Prague)
LWG3270	Parsing and formatting %j with durations	2020-02 (Prague)	Partial
LWG3280	View converting constructors can cause constraint recursion and are unneeded	2020-02 (Prague)	Complete	15
LWG3281	Conversion from *pair-like* types to subrange is a silent semantic promotion	2020-02 (Prague)	Complete	13
LWG3282	subrange converting constructor should disallow derived to base conversions	2020-02 (Prague)	Complete	15
LWG3284	random_access_iterator semantic constraints accidentally promote difference type using unary negate	2020-02 (Prague)	Nothing To Do
LWG3285	The type of a customization point object shall satisfy semiregular	2020-02 (Prague)	Nothing To Do
LWG3286	ranges::size is not required to be valid after a call to ranges::begin on an input range	2020-02 (Prague)	Complete	15
LWG3291	iota_view::iterator has the wrong iterator_category	2020-02 (Prague)	Complete	15
LWG3292	iota_view is under-constrained	2020-02 (Prague)	Complete	15
LWG3294	zoned_time deduction guides misinterprets string/char*	2020-02 (Prague)	Complete	19
LWG3296	Inconsistent default argument for basic_regex<>::assign	2020-02 (Prague)	Complete
LWG3299	Pointers don’t need customized iterator behavior	2020-02 (Prague)	Complete	15
LWG3300	Non-array ssize overload is underconstrained	2020-02 (Prague)	Nothing To Do
LWG3301	transform_view::iterator has incorrect iterator_category	2020-02 (Prague)	Complete	15
LWG3302	Range adaptor objects keys and values are unspecified	2020-02 (Prague)	Complete	16
LWG3303	Bad “constexpr“ marker for destroy/destroy_n	2020-02 (Prague)
LWG3304	Allocate functions of std::polymorphic_allocator should require [[nodiscard]]	2020-02 (Prague)	Complete	16
LWG3307	std::allocator<void>().allocate(n)	2020-02 (Prague)	Complete	20
LWG3310	Replace SIZE_MAX with numeric_limits<size_t>::max()	2020-02 (Prague)	Complete	16
LWG3313	join_view::iterator::operator-- is incorrectly constrained	2020-02 (Prague)	Complete	14
LWG3314	Is stream insertion behavior locale dependent when Period::type is micro?	2020-02 (Prague)	Complete	16
LWG3315	LWG3315: Correct Allocator Default Behavior	2020-02 (Prague)	Complete
LWG3316	Correctly define epoch for utc_clock / utc_timepoint	2020-02 (Prague)
LWG3317	Incorrect operator<< for floating-point durations	2020-02 (Prague)	Complete	16
LWG3318	Clarify whether clocks can represent time before their epoch	2020-02 (Prague)
LWG3319	Properly reference specification of IANA time zone database	2020-02 (Prague)	Nothing To Do
LWG3320	span::cbegin/cend methods produce different results than std::[ranges::]cbegin/cend	2020-02 (Prague)	Complete
LWG3321	uninitialized_construct_using_allocator should use construct_at	2020-02 (Prague)	Complete	16
LWG3323	*has-tuple-element* helper concept needs convertible_to	2020-02 (Prague)	Complete	16
LWG3324	Special-case std::strong/weak/partial_order for pointers	2020-02 (Prague)	Complete	14
LWG3325	Constrain return type of transformation function for transform_view	2020-02 (Prague)	Complete	15
LWG3326	enable_view has false positives	2020-02 (Prague)	Complete	15
LWG3327	Format alignment specifiers vs. text direction	2020-02 (Prague)	Nothing To Do
LWG3328	Clarify that std::string is not good for UTF-8	2020-02 (Prague)	Nothing To Do
LWG3329	totally_ordered_with both directly and indirectly requires common_reference_with	2020-02 (Prague)	Complete	13
LWG3330	Include <compare> from most library headers	2020-02 (Prague)	Complete	13
LWG3331	Define totally_ordered/_with in terms of partially-ordered-with	2020-02 (Prague)	Complete	13
LWG3332	Issue in §[time.format]	2020-02 (Prague)	Complete	16
LWG3334	basic_osyncstream move assignment and destruction calls basic_syncbuf::emit() twice	2020-02 (Prague)	Complete	18
LWG3335	Resolve C++20 NB comments US 273 and GB 274	2020-02 (Prague)	Complete	15
LWG3338	Rename default_constructible to default_initializable	2020-02 (Prague)	Complete	13
LWG3340	Formatting functions should throw on argument/format string mismatch in §[format.functions]	2020-02 (Prague)	Complete	14
LWG3346	pair and tuple copy and move constructor have backwards specification	2020-02 (Prague)	Nothing To Do
LWG3347	std::pair<T, U> now requires T and U to be less-than-comparable	2020-02 (Prague)	Complete	17
LWG3348	__cpp_lib_unwrap_ref in wrong header	2020-02 (Prague)	Complete	12
LWG3349	Missing __cpp_lib_constexpr_complex for P0415R1	2020-02 (Prague)	Complete	16
LWG3350	Simplify return type of lexicographical_compare_three_way	2020-02 (Prague)	Complete	17
LWG3351	ranges::enable_safe_range should not be constrained	2020-02 (Prague)	Complete	15
LWG3352	strong_equality isn’t a thing	2020-02 (Prague)	Complete	19
LWG3354	has_strong_structural_equality has a meaningless definition	2020-02 (Prague)	Nothing To Do
LWG3355	The memory algorithms should support move-only input iterators introduced by P1207	2020-02 (Prague)	Complete	15
LWG3356	__cpp_lib_nothrow_convertible should be __cpp_lib_is_nothrow_convertible	2020-02 (Prague)	Complete	12
LWG3358	§[span.cons] is mistaken that to_address can throw	2020-02 (Prague)	Complete	17
LWG3359	<chrono> leap second support should allow for negative leap seconds	2020-02 (Prague)	Complete	21
LWG3360	three_way_comparable_with is inconsistent with similar concepts	2020-02 (Prague)	Nothing To Do
LWG3362	Strike stop_source‘s operator!=	2020-02 (Prague)	Complete	17
LWG3363	drop_while_view should opt-out of sized_range	2020-02 (Prague)	Nothing To Do
LWG3364	Initialize data members of ranges and their iterators	2020-02 (Prague)	Complete	16
LWG3367	Integer-class conversions should not throw	2020-02 (Prague)	Nothing To Do
LWG3369	span‘s deduction-guide for built-in arrays doesn’t work	2020-02 (Prague)	Complete	14
LWG3371	visit_format_arg and make_format_args are not hidden friends	2020-02 (Prague)	Complete	14
LWG3372	vformat_to should not try to deduce Out twice	2020-02 (Prague)	Complete	14
LWG3373	{to,from}_chars_result and format_to_n_result need the “we really mean what we say” wording	2020-02 (Prague)	Complete	14
LWG3374	P0653 + P1006 should have made the other std::to_address overload constexpr	2020-02 (Prague)	Complete	12
LWG3375	decay in viewable_range should be remove_cvref	2020-02 (Prague)	Complete	15
LWG3377	elements_view::iterator befriends a specialization of itself	2020-02 (Prague)	Nothing To Do
LWG3379	“safe“ in several library names is misleading	2020-02 (Prague)	Complete	15
LWG3380	common_type and comparison categories	2020-02 (Prague)	Complete	15
LWG3381	begin and data must agree for contiguous_range	2020-02 (Prague)	Nothing To Do
LWG3382	NTTP for pair and array	2020-02 (Prague)	Nothing To Do
LWG3383	§[time.zone.leap.nonmembers] sys_seconds should be replaced with seconds	2020-02 (Prague)	Complete	19
LWG3384	transform_view::*sentinel* has an incorrect operator-	2020-02 (Prague)	Complete	15
LWG3385	common_iterator is not sufficiently constrained for non-copyable iterators	2020-02 (Prague)	Complete	15
LWG3387	§[range.reverse.view] reverse_view<V> unintentionally requires range<const V>	2020-02 (Prague)	Complete	15
LWG3388	view iterator types have ill-formed <=> operators	2020-02 (Prague)	Complete	16
LWG3389	A move-only iterator still does not have a counted_iterator	2020-02 (Prague)	Complete	15
LWG3390	make_move_iterator() cannot be used to construct a move_iterator for a move-only iterator	2020-02 (Prague)	Complete	14
LWG3393	Missing/incorrect feature test macro for coroutines	2020-02 (Prague)	Complete	14
LWG3395	LWG3395: Definition for three-way comparison needs to be updated (US 152)	2020-02 (Prague)	Nothing To Do
LWG3396	Clarify point of reference for source_location::current() (DE 169)	2020-02 (Prague)	Nothing To Do	16
LWG3397	ranges::basic_istream_view::iterator should not provide iterator_category	2020-02 (Prague)	Complete	16
LWG3398	tuple_element_t is also wrong for const subrange	2020-02 (Prague)	Complete	14
LWG3446	indirectly_readable_traits ambiguity for types with both value_type and element_type	2020-11 (Virtual)	Complete	13