ISO/ IEC JTC1/SC22/WG21 - Papers 2025

WG21 Number Title Author Document Date Mailing Date Previous Version Subgroup Disposition
SD-1 2025 PL22.16/WG21 document list Nevin Liber 2025-01-17 2025-01

mailing2025-01 pre-Hagenberg

WG21 Number Title Author Document Date Mailing Date Previous Version Subgroup Disposition
2024-01 pre-Hagenberg
P0149R1 Generalised member pointers Jeff Snyder 2025-01-13 2025-01 P0149R0 EWG Evolution
P0260R14 C++ Concurrent Queues Detlef Vollmann, Lawrence Crowl, Chris Mysen, Gor Nishanov 2025-01-13 2025-01 P0260R13 SG1 Concurrency and Parallelism,LEWG Library Evolution
P0876R19 fiber_context - fibers without scheduler Oliver Kowalke, Nat Goodspeed 2025-01-13 2025-01 P0876R18 EWG Evolution,CWG Core,LWG Library
P1030R8 std::filesystem::path_view Niall Douglas 2024-12-21 2025-01 P1030R7 LEWG Library Evolution
P1839R7 Accessing object representations Brian Bi, Krystian Stasiowski, Timur Doumler 2025-01-11 2025-01 P1839R6 CWG Core
P2079R6 System execution context Lucian Radu Teodorescu, Ruslan Arutyunyan, Lee Howes, Michael Voss 2025-01-13 2025-01 P2079R5 SG1 Concurrency and Parallelism,LEWG Library Evolution
P2414R5 Pointer lifetime-end zap proposed solutions Paul E. McKenney, Maged Michael, Jens Maurer, Peter Sewell, Martin Uecker, Hans Boehm, Hubert Tong, Niall Douglas, Thomas Rodgers, Will Deacon, Michael Wong, David Goldblatt, Kostya Serebryany, Anthony Williams, Tom Scogland, and JF Bastien 2025-01-12 2025-01 P2414R4 SG1 Concurrency and Parallelism,LEWG Library Evolution,LWG Library
P2434R3 Nondeterministic pointer provenance S. Davis Herring 2025-01-13 2025-01 P2434R2 SG22 Compatibility,EWG Evolution,CWG Core
P2654R1 Modules and Macros Alisdair Meredith 2025-01-13 2025-01 P2654R0 EWG Evolution,LEWG Library Evolution
P2663R6 Proposal to support interleaved complex values in std::simd Daniel Towner, Ruslan Arutyunyan 2025-01-13 2025-01 P2663R5 LEWG Library Evolution
P2664R9 Proposal to extend std::simd with permutation API Daniel Towner, Ruslan Arutyunyan 2025-01-13 2025-01 P2664R8 SG1 Concurrency and Parallelism,LEWG Library Evolution
P2688R5 Pattern Matching: `match` Expression Michael Park 2025-01-13 2025-01 P2688R4 EWG Evolution
P2719R2 Type-aware allocation and deallocation functions Louis Dionne, Oliver Hunt 2025-01-06 2025-01 P2719R1 EWG Evolution,CWG Core
P2719R3 Type-aware allocation and deallocation functions Louis Dionne, Oliver Hunt 2025-01-08 2025-01 P2719R2 EWG Evolution,CWG Core
P2746R7 Deprecate and Replace Fenv Rounding Modes Hans Boehm 2025-01-13 2025-01 P2746R6 SG6 Numerics,LEWG Library Evolution
P2758R4 Emitting messages at compile time Barry Revzin 2025-01-07 2025-01 P2758R3 LEWG Library Evolution,CWG Core
P2806R3 do expressions Barry Revzin, Bruno Cardoso Lopez, Zach Laine, Michael Park 2025-01-12 2025-01 P2806R2 EWG Evolution
P2825R4 Overload resolution hook: declcall( unevaluated-call-expression ) Gašper Ažman 2025-01-13 2025-01 P2825R3 EWG Evolution,CWG Core
P2830R8 Standardized Constexpr Type Ordering Gašper Ažman, Nathan Nichols 2025-01-09 2025-01 P2830R7 LWG Library
P2830R9 Standardized Constexpr Type Ordering Gašper Ažman, Nathan Nichols 2025-01-10 2025-01 P2830R8 EWG Evolution,LEWG Library Evolution,CWG Core,LWG Library
P2841R6 Concept and variable-template template-parameters Corentin Jabot, Gašper Ažman, James Touton, Hubert Tong 2025-01-13 2025-01 P2841R5 CWG Core
P2843R1 Preprocessing is never undefined Alisdair Meredith 2025-01-13 2025-01 P2843R0 SG22 Compatibility,EWG Evolution
P2883R1 `offsetof` Should Be A Keyword In C++26 Alisdair Meredith 2025-01-10 2025-01 P2883R0 EWGI SG17: EWG Incubator,EWG Evolution
P2899R0 Contracts for C++ - Rationale Timur Doumler, Joshua Berne, Andrzej Krzemieński, Rostislav Khlebnikov 2025-01-13 2025-01 SG21 Contracts,EWG Evolution,LEWG Library Evolution
P2900R13 Contracts for C++ Joshua Berne, Timur Doumler, Andrzej Krzemieński 2025-01-13 2025-01 P2900R12 CWG Core,LWG Library
P2933R3 Extend <bit> header function with overloads for std::simd Daniel Towner, Ruslan Arutyunyan 2025-01-13 2025-01 P2933R2 LWG Library
P2952R2 auto& operator=(X&&) = default Arthur O'Dwyer, Matthew Taylor 2025-01-08 2025-01 P2952R1 CWG Core
P2953R1 Forbid defaulting operator=(X&&) && Arthur O'Dwyer 2025-01-08 2025-01 P2953R0 EWGI SG17: EWG Incubator
P2971R3 Implication for C++ Walter E Brown 2025-01-13 2025-01 P2971R2 EWG Evolution,LEWG Library Evolution
P2988R9 std::optional<T&> Steve Downey, Peter Sommerlad 2025-01-13 2025-01 P2988R8 LEWG Library Evolution,LWG Library
P2996R9 Reflection for C++26 Barry Revzin, Wyatt Childers, Peter Dimov, Andrew Sutton, Faisal Vali, Daveed Vandevoorde, Dan Katz 2025-01-13 2025-01 P2996R8 EWG Evolution
P3019R12 Vocabulary Types for Composite Class Design Jonathan Coe, Antony Peacock, Sean Parent 2025-01-12 2025-01 P3019R11 LEWG Library Evolution,LWG Library
P3045R5 Quantities and units library Mateusz Pusz, Dominik Berner, Johel Ernesto Guerrero Peña, Charles Hogg, Nicolas Holthaus, Roth Michaels, Vincent Reverdy 2025-01-13 2025-01 P3045R4 SG6 Numerics,SG16 Unicode,LEWGI SG18: LEWG Incubator,LEWG Library Evolution
P3070R2 Formatting enums Victor Zverovich 2025-01-13 2025-01 P3070R1 LEWG Library Evolution
P3081R1 Core safety profiles for C++26 Herb Sutter 2025-01-06 2025-01 P3081R0 EWG Evolution,LEWG Library Evolution
P3086R3 Proxy: A Pointer-Semantics-Based Polymorphism Library Mingxin Wang 2025-01-13 2025-01 P3086R2 LEWGI SG18: LEWG Incubator,LEWG Library Evolution
P3094R6 std::basic_fixed_string Mateusz Pusz 2025-01-10 2025-01 P3094R5 LEWG Library Evolution
P3111R3 Atomic Reduction Operations Gonzalo Brito Gadeschi, Simon Cooksey, Daniel Lustig 2025-01-13 2025-01 P3111R2 EWG Evolution,LEWG Library Evolution
P3125R3 constexpr pointer tagging Hana Dusíková 2025-01-13 2025-01 P3125R2 LEWG Library Evolution
P3139R1 Pointer cast for unique_ptr Zhihao Yuan, Jordan Saxonberg 2024-12-27 2025-01 P3139R0 LEWG Library Evolution
P3148R1 Formatting of chrono Time Values Alan Talbot 2025-01-13 2025-01 P3148R0 LEWG Library Evolution
P3164R3 Early Diagnostics for Sender Expressions Eric Niebler 2025-01-10 2025-01 P3164R2 LEWG Library Evolution
P3176R1 The Oxford variadic comma Jan Schultke 2024-12-18 2025-01 P3176R0 CWG Core Adopted 2024-11
P3179R5 C++ parallel range algorithms Ruslan Arutyunyan, Alexey Kukanov, Bryce Adelstein Lelbach 2025-01-13 2025-01 P3179R4 LEWG Library Evolution
P3206R0 A sender query for completion behaviour Maikel Nadolski 2025-01-13 2025-01 SG1 Concurrency and Parallelism
P3229R0 Making erroneous behaviour compatible with Contracts Timur Doumler, Joshua Berne, Gašper Ažman 2025-01-13 2025-01 SG21 Contracts,EWG Evolution,LEWG Library Evolution
P3289R1 Consteval blocks Daveed Vandevoorde, Wyatt Childers, Dan Katz, Barry Revzin 2025-01-13 2025-01 P3289R0 EWG Evolution,CWG Core
P3347R1 Invalid/Prospective Pointer Operations Paul E. McKenney, Maged Michael, Jens Maurer, Peter Sewell, Martin Uecker, Hans Boehm, Hubert Tong, Niall Douglas, Thomas Rodgers, Will Deacon, Michael Wong, David Goldblatt, Kostya Serebryany, Anthony Williams, Tom Scogland, and JF Bastien 2025-01-12 2025-01 P3347R0 EWG Evolution
P3348R2 C++26 should refer to C23 not C17 Jonathan Wakely 2025-01-13 2025-01 P3348R1 SG6 Numerics,LEWG Library Evolution
P3351R2 views::scan Yihe Li 2025-01-12 2025-01 P3351R1 SG9 Ranges
P3367R3 constexpr coroutines Hana Dusíková 2025-01-06 2025-01 P3367R2 EWG Evolution,LWG Library
P3373R1 Of Operation States and Their Lifetimes Robert Leahy 2025-01-12 2025-01 P3373R0 LEWG Library Evolution
P3374R1 Adding formatter for fpos Liang Jiaming 2025-01-08 2025-01 P3374R0 LEWGI SG18: LEWG Incubator,LEWG Library Evolution
P3375R2 Reproducible floating-point results Guy Davidson 2025-01-13 2025-01 P3375R1 SG6 Numerics,EWGI SG17: EWG Incubator
P3385R3 Attributes reflection Aurelien Cassagnes, Roman Khoroshikh, Anders Johansson 2025-01-07 2025-01 P3385R2 SG7 Reflection
P3388R1 When Do You Know connect Doesn't Throw? Robert Leahy 2025-01-11 2025-01 P3388R0 LEWG Library Evolution
P3394R1 Annotations for Reflection Daveed Vandevoorde, Wyatt Childers, Dan Katz, Barry Revzin 2025-01-13 2025-01 P3394R0 SG7 Reflection,LEWG Library Evolution,CWG Core
P3395R0 Formatting of std::error_code Victor Zverovich 2024-12-22 2025-01 SG16 Unicode
P3400R0 Specifying Contract Assertion Properties with Labels Joshua Berne 2025-01-09 2025-01 SG21 Contracts,All of WG21
P3402R2 A Safety Profile Verifying Initialization Marc-André Laverdière, Christopher Lapkowski, Charles-Henri Gros 2025-01-13 2025-01 P3402R1 SG23 Safety and Security
P3407R1 Make idiomatic usage of `offsetof` well-defined Brian Bi 2025-01-11 2025-01 P3407R0 EWG Evolution
P3411R1 `any_view` Hui Xie, S. Levent Yilmaz, Louis Dionne 2025-01-11 2025-01 P3411R0 SG9 Ranges,LEWG Library Evolution
P3412R1 String interpolation Bengt Gustafsson, Victor Zverovich 2025-01-12 2025-01 P3412R0 EWGI SG17: EWG Incubator,EWG Evolution
P3420R1 Reflection of Templates Andrei Alexandrescu, Barry Revzin, Daveed Vandevoorde, Michael Garland 2025-01-13 2025-01 P3420R0 SG7 Reflection
P3423R1 Extending User-Generated Diagnostic Messages Yihe Li 2025-01-12 2025-01 P3423R0 EWG Evolution
P3425R1 Reducing operation-state sizes for subobject child operations Lewis Baker 2025-01-13 2025-01 P3425R0 LEWG Library Evolution
P3430R2 simd issues: explicit, unsequenced, identity-element position, and members of disabled simd Matthias Kretz 2025-01-13 2025-01 P3430R1 LEWG Library Evolution
P3431R0 Deprecate const-qualifier on begin/end of views Jonathan Müller 2025-01-13 2025-01 SG9 Ranges
P3439R1 Chained comparisons: Safe, correct, efficient Herb Sutter 2025-01-06 2025-01 P3439R0 EWG Evolution
P3475R1 Defang and deprecate memory_order::consume Hans Boehm 2025-01-11 2025-01 P3475R0 SG1 Concurrency and Parallelism,EWG Evolution,LEWG Library Evolution,CWG Core,LWG Library
P3477R2 There are exactly 8 bits in a byte JF Bastien 2025-01-11 2025-01 P3477R1 LEWG Library Evolution,CWG Core
P3480R3 std::simd is a range Matthias Kretz 2025-01-13 2025-01 P3480R2 LEWG Library Evolution
P3481R1 std::execution::bulk() issues Lucian Radu Teodorescu, Ruslan Arutyunyan, Lewis Baker 2025-01-13 2025-01 P3481R0 SG1 Concurrency and Parallelism,LEWG Library Evolution
P3491R1 define_static_{string,object,array} Barry Revzin, Wyatt Childers, Peter Dimov, Daveed Vandevoorde 2025-01-13 2025-01 P3491R0 EWG Evolution,LEWG Library Evolution
P3496R0 Immediate-Escalating Expressions Barry Revzin 2025-01-06 2025-01 EWG Evolution,LEWG Library Evolution
P3499R0 Exploring strict contract predicates Lisa Lippincott, Timur Doumler, Joshua Berne 2025-01-13 2025-01 SG21 Contracts,EWG Evolution
P3500R0 Are Contracts "safe"? Timur Doumler, Gašper Ažman, Joshua Berne 2025-01-13 2025-01 EWG Evolution
P3501R0 The ad-dressing of cats S. Davis Herring 2025-01-10 2025-01 EWG Evolution,CWG Core,LWG Library
P3506R0 P2900 Is Still not Ready for C++26 Gabriel Dos Reis 2025-01-13 2025-01 EWG Evolution
P3516R0 Uninitialized algorithms for relocation Louis Dionne, Giuseppe D’Angelo 2025-01-13 2025-01 LEWG Library Evolution
P3527R1 Pattern Matching: *variant-like* and `std::expected` Michael Park, Zach Laine 2025-01-13 2025-01 P3527R0 EWG Evolution,LEWG Library Evolution
P3533R1 constexpr virtual inheritance Hana Dusíková 2025-01-10 2025-01 P3533R0 EWG Evolution
P3534R0 Avoid UB When Compiling Code That Violates Library Specification Alisdair Meredith 2025-01-13 2025-01 LWG Library
P3541R1 Violation handlers vs `noexcept` Andrzej Krzemieński 2025-01-07 2025-01 P3541R0 SG21 Contracts,SG23 Safety and Security,EWG Evolution
P3546R0 Explicit return type deduction for std::numeric_limits and numbers Thomas Mejstrik 2024-12-19 2025-01 LEWGI SG18: LEWG Incubator
P3547R0 Modeling Access Control With Reflection Dan Katz, Ville Voutilainen 2025-01-09 2025-01 SG7 Reflection,LEWG Library Evolution
P3548R0 P1030 `std::filesystem::path_view` forward progress options Niall Douglas 2025-01-13 2025-01 LEWG Library Evolution
P3549R0 Diverging expressions Barry Revzin, Michael Park, Zach Laine, Bruno Cardoso Lopes 2025-01-12 2025-01 EWG Evolution
P3550R0 Imports cannot ... Alisdair Meredith 2025-01-13 2025-01 EWGI SG17: EWG Incubator,LEWGI SG18: LEWG Incubator
P3552R0 Add a Coroutine Lazy Type Dietmar Kühl, Maikel Nadolski 2025-01-13 2025-01 SG1 Concurrency and Parallelism,LEWG Library Evolution
P3554R0 Non-transient allocation with vector and basic_string Barry Revzin, Peter Dimov 2025-01-06 2025-01 EWG Evolution
P3555R0 An infinite range concept Jonathan Müller 2025-01-13 2025-01 SG9 Ranges
P3557R0 High-Quality Sender Diagnostics with Constexpr Exceptions Eric Niebler 2025-01-13 2025-01 LEWG Library Evolution
P3558R0 Core Language Contracts By Default Joshua Berne, John Lakos 2025-01-12 2025-01 SG21 Contracts,SG23 Safety and Security
P3559R0 Trivial relocation: One trait or two? Arthur O'Dwyer 2025-01-08 2025-01 LEWG Library Evolution
P3560R0 Error Handling in Reflection Barry Revzin, Peter Dimov 2025-01-12 2025-01 EWG Evolution,LEWG Library Evolution
P3561R0 Index based coproduct operations on variant, and library wording Esa Pulkkinen 2025-01-13 2025-01 LEWGI SG18: LEWG Incubator
P3564R0 Make the concurrent forward progress guarantee usable in `bulk` Mark Hoemmen, Bryce Adelstein Lelbach,Michael Garland 2025-01-13 2025-01 SG1 Concurrency and Parallelism
P3565R0 Virtual floating-point values S. Davis Herring 2025-01-10 2025-01 SG6 Numerics
P3566R0 You shall not pass `char*` - Safety concerns working with unbounded null-terminated strings Marco Foco 2025-01-13 2025-01 SG23 Safety and Security,LEWG Library Evolution,LWG Library,ARG ABI Review Group
P3567R0 `flat_meow` Fixes Hui Xie, Louis Dionne, Arthur O'Dwyer 2025-01-11 2025-01 LEWG Library Evolution,LWG Library
P3568R0 break label; and continue label; Jan Schultke, Sarah Quiñones 2025-01-12 2025-01 EWGI SG17: EWG Incubator,SG22 Compatibility
P3569R0 Split define_aggregate from Reflection Shafik Yaghmour, Aaron Ballman, Erich Keane, Corentin Jabot, Vlad Serebrennikov 2025-01-11 2025-01 EWG Evolution
P3572R0 Pattern matching Bjarne Stroustrup 2025-01-12 2025-01 EWG Evolution
P3573R0 Contract concerns Bjarne Stroustrup, Michael Hava, J. Daniel Garcia Sanchez, Ran Regev, Gabriel Dos Reis, John Spicer, J.C. van Winkel, David Vandevoorde, Ville Voutilainen 2025-01-12 2025-01 SG21 Contracts,EWG Evolution,LEWG Library Evolution
P3574R0 Constexpr Callables Steve Downey 2025-01-13 2025-01 LEWG Library Evolution,LWG Library
P3575R0 SG14: Low Latency/Games/Embedded/Financial Trading virtual Meeting Minutes 2024/11/13 Michael Wong 2025-01-12 2025-01 SG14 Low Latency
P3576R0 SG19: Machine Learning virtual Meeting Minutes to 2024/11/14-2024/12/12 Michael Wong 2025-01-12 2025-01 SG19 Machine Learning
P3577R0 Require a non-throwing default contract-violation handler John Lakos 2025-01-12 2025-01 SG21 Contracts,EWG Evolution
P3578R0 Language Safety and Grandma Safety Ryan McDougall 2025-01-13 2025-01 SG21 Contracts,SG23 Safety and Security,EWG Evolution
P3579R0 Fix matching of non-type template parameters when matching template template parameters Matheus Izvekov 2025-01-13 2025-01 CWG Core
P3580R0 The Naming of Things Alan Talbot 2025-01-13 2025-01 EWG Evolution,LEWG Library Evolution
P3581R0 No, inplace_vector shouldn't have an Allocator Nevin Liber 2025-01-13 2025-01 LEWG Library Evolution
P3582R0 Observed a contract violation? Skip subsequent assertions! Andrzej Krzemieński 2025-01-13 2025-01 SG21 Contracts,EWG Evolution
P3583R0 Contracts, Types & Functions Jonas Persson 2025-01-13 2025-01 SG21 Contracts
P3584R0 Enrich Facade Creation Facilities for the Pointer-Semantics-Based Polymorphism Library - Proxy Mingxin Wang 2025-01-13 2025-01 LEWGI SG18: LEWG Incubator,LEWG Library Evolution
P3585R0 allocator_traits::is_internally_relocatable Pablo Halpern 2025-01-13 2025-01 LEWGI SG18: LEWG Incubator,LEWG Library Evolution
P3586R0 The Plethora of Problems With Profiles Corentin Jabot 2025-01-13 2025-01 EWG Evolution
P3587R0 Reconsider reflection access for C++26 Lauri Vasama 2025-01-13 2025-01 SG7 Reflection,EWG Evolution
P3588R0 Allow static data members in local and unnamed classes Brian Bi 2025-01-13 2025-01 EWG Evolution
P3589R0 C++ Profiles: The Framework Gabriel Dos Reis 2025-01-13 2025-01 EWG Evolution
P3590R0 Constexpr Coroutines Burdens Daveed Vandevoorde 2025-01-13 2025-01 EWG Evolution,CWG Core