WG21 PAPERS

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Filter and export papers from the C++ Committee’s monthly mailings by time frame and audience using the options below, or refine your export further with the Select button. Links point directly to the official WG21 papers on open-std.org.

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Select	Paper	Title	Authors	Audience
	P2964R4	Allowing user-defined types in std::simd	D. Towner, R. Arutyunyan	LEWG SG6
Mailing Date 2026-05 Pre-Brno Author(s) Daniel Towner, Ruslan Arutyunyan Target Audience LEWG SG6 Revisions R5 R3 R2 Tracking issue View on GitHub Abstract The C++ standard library includes data-parallel types in the `<simd>` header, currently restricting element types to a closed list of built-in vectorizable types: arithmetic types and `std::complex` specializations. This paper proposes a minimal change to the specification in which this list is extended. Firstly, `std::byte` is added to the closed list as a standard library type with fixed seman
	P3045R8	Quantities and units library	M. Pusz, D. Berner, J. Peña, C. Hogg, N. Holthaus, R. Michaels, V. Reverdy	LEWG SG6 SG16 SG20
Mailing Date 2026-05 Pre-Brno Author(s) Mateusz Pusz, Dominik Berner, Johel Ernesto Guerrero Peña, Charles Hogg, Nicolas Holthaus, Roth Michaels, Vincent Reverdy Target Audience LEWG SG6 SG16 SG20 Revisions R9 R7 Tracking issue View on GitHub Abstract Several groups in the ISO C++ Committee reviewed the “P1935: A C++ Approach to Physical Units” [[P1935R2]](https://wg21.link/p1935r2) proposal in Belfast 2019 and Prague 2020. All those groups expressed interest in the potential standardization of such a library and encouraged further work. The authors also got valuable initial feedback that highly influenced the design of the V2 version of the [[
	P4185R0	Completing the Mathematical Model for C++ Quantities and Units	M. Pusz	SG6
Mailing Date 2026-05 Pre-Brno Author(s) Mateusz Pusz Target Audience SG6 Revisions R1 Tracking issue View on GitHub Abstract [[P3045R7]](https://wg21.link/p3045r7) proposes a C++ quantities and units framework built on two core abstractions: `quantity` (displacement vectors) and `quantity_point` (points in an affine space). Real-world experience with the [[mp-units]](https://mpusz.github.io/mp-units) reference implementation, together with feedback from SG6, BSI, ANSI, and the broader C++ community, shows that this
	P4209R0	numeric_limits for std::simd	D. Towner	LEWG SG6
Mailing Date 2026-05 Pre-Brno Author(s) Daniel Towner Target Audience LEWG SG6 Tracking issue View on GitHub Abstract The SIMD working draft introduces `std::simd::basic_vec<T, Abi>` as an element-wise parallel extension of an element type `T`. A central goal is to allow the same generic numeric code to operate on scalar `T` and on `basic_vec<T, Abi>` interchangeably. Most non-trivial numeric code that aims for that behaviour would require `std::numeric_limits<V>` somewhere. For example:
	P4212R0	ISO/IEC 60559 Floating-Point Support Annex for C++	G. Davidson	SG6
Mailing Date 2026-05 Pre-Brno Author(s) Guy Davidson Target Audience SG6 Tracking issue View on GitHub Abstract This proposal introduces a new Annex specifying ISO/IEC 60559 conformance. There are nine clauses that need to be considered from ISO/IEC 60559:2020, clauses 3 to 11. [559] offers binary and decimal floating-point arithmetic features. This proposal will only introduce binary floating-point feature support.
	P4229R0	Canonical Parallel Scan: Expression and Observation Contracts for Reproducible Parallel Algorithms	A. Drakeford	SG6 SG18 SG22
Mailing Date 2026-05 Pre-Brno Author(s) Andrew Drakeford Target Audience SG6 SG18 SG22 Tracking issue View on GitHub Abstract Blelloch [Blelloch1990] identifies `reduce`, `scan`, and `transform` as core parallel primitives. P4016R0 demonstrated that efficient, reproducible reduction is achievable using a tree-based abstract expression.
	P4231R0	Unified floating point rounding proposal	H. Boehm, G. Davidson, J. Schultke	LEWG SG6
Mailing Date 2026-05 Pre-Brno Author(s) Hans Boehm, Guy Davidson, Jan Schultke Target Audience LEWG SG6 Tracking issue View on GitHub Abstract We propose the addition of the following struct. Actual wording is still left as future work (some of which can be taken from p3864). This is basically identical to P2746, except that we constrain operations to be IEEE conformant whenever is_iec_559 is `true`.

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