WG21 PAPERS

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Select	Paper	Title	Authors	Audience	Mailing Date
	P0876R23	fiber_context - fibers without scheduler	Oliver Kowalke O. Kowalke , Nat Goodspeed N. Goodspeed	CWG LWG	2026-05
Mailing Date 2026-05 Pre-Brno Author(s) Oliver Kowalke, Nat Goodspeed Target Audience CWG LWG Revisions R24 R22 R21 Tracking issue View on GitHub Abstract This paper proposes a minimal API that enables stackful context switching without the need for a scheduler. The API is suitable to act as building-block for high-level constructs such as stackful coroutines as well as cooperative multitasking (aka user-land/green threads that incorporate a scheduling facility).
	P3104R5	Bit permutations	Jan Schultke J. Schultke	LWG	2026-05
Mailing Date 2026-05 Pre-Brno Author(s) Jan Schultke Target Audience LWG Revisions R6 R4 Tracking issue View on GitHub Abstract The C++ bit manipulation library in `<bit>` is an invaluable abstraction from hardware operations. Functions like `countl_zero` help the programmer avoid use of intrinsic functions or inline assembly.
	P3125R5	constexpr pointer tagging	Hana Dusíková H. Dusíková	LEWG LWG	2026-05
Mailing Date 2026-05 Pre-Brno Author(s) Hana Dusíková Target Audience LEWG LWG Revisions R6 Tracking issue View on GitHub Abstract Pointer tagging is widely known and used technique ([Glasgow Haskell Compiler](https://takenobu-hs.github.io/downloads/haskell_ghc_illustrated.pdf), LLVM's `[PointerIntPair](https://github.com/llvm/llvm-project/blob/8e5aa538caccef167e8096b2173fdaf2be9cc129/llvm/include/llvm/ADT/PointerIntPair.h#L80)`, `[PointerUnion](https://github.com/llvm/llvm-project/blob/8e5aa538caccef167e8096b2173fdaf2be9cc12
	P3428R3	Hazard Pointer Batches	Maged Michael M. Michael , Michael Wong M. Wong , Paul McKenney P. McKenney	LWG	2026-05
Mailing Date 2026-05 Pre-Brno Author(s) Maged Michael, Michael Wong, Paul McKenney Target Audience LWG Revisions R4 Tracking issue View on GitHub Abstract This paper proposes extending the C++26 hazard pointer interface to support creation and destruction of batches of nonempty hazard pointers. This revision P3428R3 revises R2 by following LEWG Croydon 2026 feedback. It is ready for review by LWG in Brno 2026.
	P3891R1	Improve readability of the C++ grammar by adding a syntax for groups and repetitions	Jan Schultke J. Schultke	CWG LWG	2026-05
Mailing Date 2026-05 Pre-Brno Author(s) Jan Schultke Target Audience CWG LWG Tracking issue View on GitHub Abstract The current C++ syntax notation as specified in [[syntax]](https://eel.is/c++draft/syntax) and summarized in [[gram]](https://eel.is/c++draft/gram) has only a handful of features:
	P3983R2	simd object representation	Daniel Towner D. Towner , Ruslan Arutyunyan R. Arutyunyan	LEWG LWG SG1	2026-05
Mailing Date 2026-05 Pre-Brno Author(s) Daniel Towner, Ruslan Arutyunyan Target Audience LEWG LWG SG1 Revisions R1 R0 Tracking issue View on GitHub Abstract The Working Draft makes `simd` types trivially copyable types, which allows `std::bit_cast` operations. However, the object representation is unspecified, making the results similarly unspecified.
	P4233R0	More minor additions to standard library hardening	Konstantin Varlamov K. Varlamov	LEWG LWG	2026-05
Mailing Date 2026-05 Pre-Brno Author(s) Konstantin Varlamov Target Audience LEWG LWG Tracking issue View on GitHub Abstract This paper is a small followup to [P3471R4 “Standard Library Hardening”](https://wg21.link/P3471R4) and [P3697R1 “Minor additions to C++26 standard library hardening”](https://wg21.link/P3697) that proposes adding several hardened preconditions across the Library. The unifying theme is in fact a lack of a unifying theme; these are “miscellaneous” checks that don’t fit into a larger category. This

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