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llvm-project/libcxx/docs/Status/Cxx23Papers.csv
A. Jiang 4a509f853f
[libc++] Implement comparison operators for tuple added in C++23 (#148799) 
And constrain the new `operator==` since C++26.

This patch implements parts of P2165R4, P2944R3, and a possibly improved
resolution of LWG3882. Currently, libstdc++ and MSVC STL constrain the
new overloads in the same way.

Also set feature-test macro `__cpp_lib_constrained_equality` and add
related release note, as P2944R3 will completed with this patch.

Fixes #136765
Fixes #136770
Fixes #105424
2025-08-01 11:53:33 -04:00

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"Paper #","Paper Name","Meeting","Status","First released version","Notes"
"`P0881R7 <https://wg21.link/P0881R7>`__","A Proposal to add stacktrace library","2020-11 (Virtual)","","",""
"`P0943R6 <https://wg21.link/P0943R6>`__","Support C atomics in C++","2020-11 (Virtual)","|Complete|","15",""
"`P1048R1 <https://wg21.link/P1048R1>`__","A proposal for a type trait to detect scoped enumerations","2020-11 (Virtual)","|Complete|","12",""
"`P1679R3 <https://wg21.link/P1679R3>`__","string contains function","2020-11 (Virtual)","|Complete|","12",""
"","","","","",""
"`P1682R3 <https://wg21.link/P1682R3>`__","std::to_underlying for enumerations","2021-02 (Virtual)","|Complete|","13",""
"`P2017R1 <https://wg21.link/P2017R1>`__","Conditionally borrowed ranges","2021-02 (Virtual)","|Complete|","16",""
"`P2160R1 <https://wg21.link/P2160R1>`__","Locks lock lockables","2021-02 (Virtual)","|Nothing To Do|","",""
"`P2162R2 <https://wg21.link/P2162R2>`__","Inheriting from std::variant","2021-02 (Virtual)","|Complete|","13",""
"`P2212R2 <https://wg21.link/P2212R2>`__","Relax Requirements for time_point::clock","2021-02 (Virtual)","|Nothing To Do|","",""
"`P2259R1 <https://wg21.link/P2259R1>`__","Repairing input range adaptors and counted_iterator","2021-02 (Virtual)","","",""
"","","","","",""
"`P0401R6 <https://wg21.link/P0401R6>`__","Providing size feedback in the Allocator interface","2021-06 (Virtual)","|Complete|","15",""
"`P0448R4 <https://wg21.link/P0448R4>`__","A strstream replacement using span<charT> as buffer","2021-06 (Virtual)","","",""
"`P1132R8 <https://wg21.link/P1132R8>`__","out_ptr - a scalable output pointer abstraction","2021-06 (Virtual)","|Complete|","19",""
"`P1328R1 <https://wg21.link/P1328R1>`__","Making std::type_info::operator== constexpr","2021-06 (Virtual)","|Complete|","17",""
"`P1425R4 <https://wg21.link/P1425R4>`__","Iterators pair constructors for stack and queue","2021-06 (Virtual)","|Complete|","14",""
"`P1518R2 <https://wg21.link/P1518R2>`__","Stop overconstraining allocators in container deduction guides","2021-06 (Virtual)","|Complete|","13",""
"`P1659R3 <https://wg21.link/P1659R3>`__","starts_with and ends_with","2021-06 (Virtual)","|Complete|","19",""
"`P1951R1 <https://wg21.link/P1951R1>`__","Default Arguments for pair Forwarding Constructor","2021-06 (Virtual)","|Complete|","14",""
"`P1989R2 <https://wg21.link/P1989R2>`__","Range constructor for std::string_view","2021-06 (Virtual)","|Complete|","14",""
"`P2136R3 <https://wg21.link/P2136R3>`__","invoke_r","2021-06 (Virtual)","|Complete|","17",""
"`P2166R1 <https://wg21.link/P2166R1>`__","A Proposal to Prohibit std::basic_string and std::basic_string_view construction from nullptr","2021-06 (Virtual)","|Complete|","13",""
"","","","","",""
"`P0288R9 <https://wg21.link/P0288R9>`__","``any_invocable``","2021-10 (Virtual)","","",""
"`P0798R8 <https://wg21.link/P0798R8>`__","Monadic operations for ``std::optional``","2021-10 (Virtual)","|Complete|","14",""
"`P0849R8 <https://wg21.link/P0849R8>`__","``auto(x)``: ``DECAY_COPY`` in the language","2021-10 (Virtual)","|Complete|","14",""
"`P1072R10 <https://wg21.link/P1072R10>`__","``basic_string::resize_and_overwrite``","2021-10 (Virtual)","|Complete|","14",""
"`P1147R1 <https://wg21.link/P1147R1>`__","Printing ``volatile`` Pointers","2021-10 (Virtual)","|Complete|","14",""
"`P1272R4 <https://wg21.link/P1272R4>`__","Byteswapping for fun&&nuf","2021-10 (Virtual)","|Complete|","14",""
"`P1675R2 <https://wg21.link/P1675R2>`__","``rethrow_exception`` must be allowed to copy","2021-10 (Virtual)","|Nothing To Do|","",""
"`P2077R3 <https://wg21.link/P2077R3>`__","Heterogeneous erasure overloads for associative containers","2021-10 (Virtual)","","",""
"`P2251R1 <https://wg21.link/P2251R1>`__","Require ``span`` & ``basic_string_view`` to be Trivially Copyable","2021-10 (Virtual)","|Complete|","14",""
"`P2301R1 <https://wg21.link/P2301R1>`__","Add a ``pmr`` alias for ``std::stacktrace``","2021-10 (Virtual)","","",""
"`P2321R2 <https://wg21.link/P2321R2>`__","``zip``","2021-10 (Virtual)","|In Progress|","",""
"`P2340R1 <https://wg21.link/P2340R1>`__","Clarifying the status of the 'C headers'","2021-10 (Virtual)","|Nothing To Do|","",""
"`P2393R1 <https://wg21.link/P2393R1>`__","Cleaning up ``integer``-class types","2021-10 (Virtual)","","",""
"`P2401R0 <https://wg21.link/P2401R0>`__","Add a conditional ``noexcept`` specification to ``std::exchange``","2021-10 (Virtual)","|Complete|","14",""
"","","","","",""
"`P0323R12 <https://wg21.link/P0323R12>`__","``std::expected``","2022-02 (Virtual)","|Complete|","16",""
"`P0533R9 <https://wg21.link/P0533R9>`__","``constexpr`` for ``<cmath>`` and ``<cstdlib>``","2022-02 (Virtual)","|In Progress|","","``isfinite``, ``isinf``, ``isnan`` and ``isnormal`` are implemented"
"`P0627R6 <https://wg21.link/P0627R6>`__","Function to mark unreachable code","2022-02 (Virtual)","|Complete|","15",""
"`P1206R7 <https://wg21.link/P1206R7>`__","``ranges::to``: A function to convert any range to a container","2022-02 (Virtual)","|Complete|","17",""
"`P1413R3 <https://wg21.link/P1413R3>`__","Deprecate ``std::aligned_storage`` and ``std::aligned_union``","2022-02 (Virtual)","|Complete|","","``std::aligned_storage_t`` and ``std::aligned_union_t`` are marked deprecated, but clang doesn't issue a diagnostic for deprecated using template declarations."
"`P2255R2 <https://wg21.link/P2255R2>`__","A type trait to detect reference binding to temporary","2022-02 (Virtual)","|Partial|","","Implemented the type traits only."
"`P2273R3 <https://wg21.link/P2273R3>`__","Making ``std::unique_ptr`` constexpr","2022-02 (Virtual)","|Complete|","16",""
"`P2387R3 <https://wg21.link/P2387R3>`__","Pipe support for user-defined range adaptors","2022-02 (Virtual)","|Complete|","19",""
"`P2440R1 <https://wg21.link/P2440R1>`__","``ranges::iota``, ``ranges::shift_left`` and ``ranges::shift_right``","2022-02 (Virtual)","|Partial|","","Only ``ranges::iota`` is implemented."
"`P2441R2 <https://wg21.link/P2441R2>`__","``views::join_with``","2022-02 (Virtual)","|Complete|","21",""
"`P2442R1 <https://wg21.link/P2442R1>`__","Windowing range adaptors: ``views::chunk`` and ``views::slide``","2022-02 (Virtual)","","",""
"`P2443R1 <https://wg21.link/P2443R1>`__","``views::chunk_by``","2022-02 (Virtual)","|Complete|","18",""
"","","","","",""
"`P0009R18 <https://wg21.link/P0009R18>`__","mdspan: A Non-Owning Multidimensional Array Reference","2022-07 (Virtual)","|Complete|","18",""
"`P0429R9 <https://wg21.link/P0429R9>`__","A Standard ``flat_map``","2022-07 (Virtual)","|Complete|","20",""
"`P1169R4 <https://wg21.link/P1169R4>`__","``static operator()``","2022-07 (Virtual)","|Complete|","16",""
"`P1222R4 <https://wg21.link/P1222R4>`__","A Standard ``flat_set``","2022-07 (Virtual)","|Complete|","21",""
"`P1223R5 <https://wg21.link/P1223R5>`__","``ranges::find_last()``, ``ranges::find_last_if()``, and ``ranges::find_last_if_not()``","2022-07 (Virtual)","|Complete|","19",""
"`P1467R9 <https://wg21.link/P1467R9>`__","Extended ``floating-point`` types and standard names","2022-07 (Virtual)","","",""
"`P1642R11 <https://wg21.link/P1642R11>`__","Freestanding ``[utilities]``, ``[ranges]``, and ``[iterators]``","2022-07 (Virtual)","","",""
"`P1899R3 <https://wg21.link/P1899R3>`__","``stride_view``","2022-07 (Virtual)","","",""
"`P2093R14 <https://wg21.link/P2093R14>`__","Formatted output","2022-07 (Virtual)","|Complete|","18",""
"`P2165R4 <https://wg21.link/P2165R4>`__","Compatibility between ``tuple``, ``pair`` and ``tuple-like`` objects","2022-07 (Virtual)","|Partial|","","Changes of ``tuple``, ``adjacent_view``, and ``cartesian_product_view`` are not yet implemented."
"`P2278R4 <https://wg21.link/P2278R4>`__","``cbegin`` should always return a constant iterator","2022-07 (Virtual)","","",""
"`P2286R8 <https://wg21.link/P2286R8>`__","Formatting Ranges","2022-07 (Virtual)","|Complete|","16",""
"`P2291R3 <https://wg21.link/P2291R3>`__","Add Constexpr Modifiers to Functions ``to_chars`` and ``from_chars`` for Integral Types in ``<charconv>`` Header","2022-07 (Virtual)","|Complete|","16",""
"`P2302R4 <https://wg21.link/P2302R4>`__","``std::ranges::contains``","2022-07 (Virtual)","|Complete|","19",""
"`P2322R6 <https://wg21.link/P2322R6>`__","``ranges::fold``","2022-07 (Virtual)","","",""
"`P2374R4 <https://wg21.link/P2374R4>`__","``views::cartesian_product``","2022-07 (Virtual)","","",""
"`P2404R3 <https://wg21.link/P2404R3>`__","Move-only types for ``equality_comparable_with``, ``totally_ordered_with``, and ``three_way_comparable_with``","2022-07 (Virtual)","","",""
"`P2408R5 <https://wg21.link/P2408R5>`__","Ranges iterators as inputs to non-Ranges algorithms","2022-07 (Virtual)","","",""
"`P2417R2 <https://wg21.link/P2417R2>`__","A more ``constexpr`` ``bitset``","2022-07 (Virtual)","|Complete|","16",""
"`P2419R2 <https://wg21.link/P2419R2>`__","Clarify handling of encodings in localized formatting of chrono types","2022-07 (Virtual)","","",""
"`P2438R2 <https://wg21.link/P2438R2>`__","``std::string::substr() &&``","2022-07 (Virtual)","|Complete|","16",""
"`P2445R1 <https://wg21.link/P2445R1>`__","``forward_like``","2022-07 (Virtual)","|Complete|","16",""
"`P2446R2 <https://wg21.link/P2446R2>`__","``views::as_rvalue``","2022-07 (Virtual)","|Complete|","16",""
"`P2460R2 <https://wg21.link/P2460R2>`__","Relax requirements on ``wchar_t`` to match existing practices","2022-07 (Virtual)","|Nothing To Do|","",""
"`P2465R3 <https://wg21.link/P2465R3>`__","Standard Library Modules ``std`` and ``std.compat``","2022-07 (Virtual)","|Complete|","19",""
"`P2467R1 <https://wg21.link/P2467R1>`__","Support exclusive mode for ``fstreams``","2022-07 (Virtual)","|Complete|","18",""
"`P2474R2 <https://wg21.link/P2474R2>`__","``views::repeat``","2022-07 (Virtual)","|Complete|","17",""
"`P2494R2 <https://wg21.link/P2494R2>`__","Relaxing range adaptors to allow for move only types","2022-07 (Virtual)","|Complete|","17",""
"`P2499R0 <https://wg21.link/P2499R0>`__","``string_view`` range constructor should be ``explicit``","2022-07 (Virtual)","|Complete|","16",""
"`P2502R2 <https://wg21.link/P2502R2>`__","``std::generator``: Synchronous Coroutine Generator for Ranges","2022-07 (Virtual)","","",""
"`P2508R1 <https://wg21.link/P2508R1>`__","Exposing ``std::basic-format-string``","2022-07 (Virtual)","|Complete|","15",""
"`P2517R1 <https://wg21.link/P2517R1>`__","Add a conditional ``noexcept`` specification to ``std::apply``","2022-07 (Virtual)","|Complete|","3.9",""
"`P2520R0 <https://wg21.link/P2520R0>`__","``move_iterator`` should be a random access iterator","2022-07 (Virtual)","|Complete|","17","Implemented as a DR in C++20"
"`P2540R1 <https://wg21.link/P2540R1>`__","Empty Product for certain Views","2022-07 (Virtual)","","",""
"`P2549R1 <https://wg21.link/P2549R1>`__","``std::unexpected`` should have ``error()`` as member accessor","2022-07 (Virtual)","|Complete|","16",""
"`P2585R0 <https://wg21.link/P2585R0>`__","Improving default container formatting","2022-07 (Virtual)","|Complete|","17",""
"`P2590R2 <https://wg21.link/P2590R2>`__","Explicit lifetime management","2022-07 (Virtual)","","",""
"`P2599R2 <https://wg21.link/P2599R2>`__","``mdspan::size_type`` should be ``index_type``","2022-07 (Virtual)","|Complete|","18",""
"`P2604R0 <https://wg21.link/P2604R0>`__","mdspan: rename pointer and contiguous","2022-07 (Virtual)","|Complete|","18",""
"`P2613R1 <https://wg21.link/P2613R1>`__","Add the missing ``empty`` to ``mdspan``","2022-07 (Virtual)","|Complete|","18",""
"","","","","",""
"`P1202R5 <https://wg21.link/P1202R5>`__","Asymmetric Fences","2022-11 (Kona)","","",""
"`P1264R2 <https://wg21.link/P1264R2>`__","Revising the wording of ``stream`` input operations","2022-11 (Kona)","|Complete|","9",""
"`P1478R8 <https://wg21.link/P1478R8>`__","``Byte-wise`` ``atomic`` ``memcpy``","2022-11 (Kona)","","",""
"`P2167R3 <https://wg21.link/P2167R3>`__","Improved Proposed Wording for LWG 2114","2022-11 (Kona)","|Complete|","20","The `[cmp.alg] <https://eel.is/c++draft/cmp.alg>`__ part is implemented as a DR against C++20. MSVC STL does the same. Other parts are Nothing To Do."
"`P2396R1 <https://wg21.link/P2396R1>`__","Concurrency TS 2 fixes ","2022-11 (Kona)","","",""
"`P2505R5 <https://wg21.link/P2505R5>`__","Monadic Functions for ``std::expected``","2022-11 (Kona)","|Complete|","17",""
"`P2539R4 <https://wg21.link/P2539R4>`__","Should the output of ``std::print`` to a terminal be synchronized with the underlying stream?","2022-11 (Kona)","|Complete|","18",""
"`P2602R2 <https://wg21.link/P2602R2>`__","Poison Pills are Too Toxic","2022-11 (Kona)","|Complete|","19","Implemented as a DR in C++20."
"`P2708R1 <https://wg21.link/P2708R1>`__","No Further Fundamentals TSes","2022-11 (Kona)","|Nothing To Do|","",""
"","","","","",""
"`P0290R4 <https://wg21.link/P0290R4>`__","``apply()`` for ``synchronized_value<T>``","2023-02 (Issaquah)","","",""
"`P2770R0 <https://wg21.link/P2770R0>`__","Stashing stashing ``iterators`` for proper flattening","2023-02 (Issaquah)","|Complete|","21",""
"`P2164R9 <https://wg21.link/P2164R9>`__","``views::enumerate``","2023-02 (Issaquah)","","",""
"`P2711R1 <https://wg21.link/P2711R1>`__","Making multi-param constructors of ``views`` ``explicit``","2023-02 (Issaquah)","|Complete|","21",""
"`P2609R3 <https://wg21.link/P2609R3>`__","Relaxing Ranges Just A Smidge","2023-02 (Issaquah)","|Complete|","20","Implemented as a DR in C++20. Other implementations will do the same."
"`P2713R1 <https://wg21.link/P2713R1>`__","Escaping improvements in ``std::format``","2023-02 (Issaquah)","|Complete|","19",""
"`P2675R1 <https://wg21.link/P2675R1>`__","``format``'s width estimation is too approximate and not forward compatible","2023-02 (Issaquah)","|Complete|","17",""
"`P2572R1 <https://wg21.link/P2572R1>`__","``std::format`` fill character allowances","2023-02 (Issaquah)","|Complete|","17",""
"`P2693R1 <https://wg21.link/P2693R1>`__","Formatting ``thread::id`` and ``stacktrace``","2023-02 (Issaquah)","|Partial|","","The formatter for ``stacktrace`` is not implemented, since ``stacktrace`` is not implemented yet"
"`P2679R2 <https://wg21.link/P2679R2>`__","Fixing ``std::start_lifetime_as`` for arrays","2023-02 (Issaquah)","","",""
"`P2674R1 <https://wg21.link/P2674R1>`__","A trait for implicit lifetime types","2023-02 (Issaquah)","|Complete|","20",""
"`P2655R3 <https://wg21.link/P2655R3>`__","``common_reference_t`` of ``reference_wrapper`` Should Be a Reference Type","2023-02 (Issaquah)","|Complete|","21","The paper is implemented as a DR to C++20"
"`P2652R2 <https://wg21.link/P2652R2>`__","Disallow User Specialization of ``allocator_traits``","2023-02 (Issaquah)","|Complete|","19",""
"`P2787R1 <https://wg21.link/P2787R1>`__","``pmr::generator`` - Promise Types are not Values","2023-02 (Issaquah)","","",""
"`P2614R2 <https://wg21.link/P2614R2>`__","Deprecate ``numeric_limits::has_denorm``","2023-02 (Issaquah)","|Complete|","18",""
"`P2588R3 <https://wg21.link/P2588R3>`__","``barrier``’s phase completion guarantees","2023-02 (Issaquah)","","",""
"`P2763R1 <https://wg21.link/P2763R1>`__","``layout_stride`` static extents default constructor fix","2023-02 (Issaquah)","","",""
"`P2736R2 <https://wg21.link/P2736R2>`__","Referencing The Unicode Standard","2023-02 (Issaquah)","|Complete|","19",""
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