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
	P2964R2	Allowing user-defined types in std::simd	D. Towner, R. Arutyunyan	LEWG SG6
Intent Proposal Mailing Date 2026-02 Pre-Croydon Author(s) Daniel Towner, Ruslan Arutyunyan Target Audience LEWG SG6 Revisions R5 R4 R3 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: arithmetic types and `std::complex` specializations. This paper proposes a minimal change to the specification in which the closed list is replaced with trait-based constraints that handle all existing types while naturally extend support to enumerations, `std::byte`
	P3045R7	Quantities and units library	M. Pusz, D. Berner, J. Peña, C. Hogg, N. Holthaus, R. Michaels, V. Reverdy	LEWG SG6 SG16 SG20
Intent Proposal Mailing Date 2026-02 Pre-Croydon 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 R8 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 [[
	P3864R1	Correctly rounded floating-point maths functions	G. Davidson, J. Schultke	SG6 SG22
Intent Proposal Mailing Date 2026-02 Pre-Croydon Author(s) Guy Davidson, Jan Schultke Target Audience SG6 SG22 Tracking issue View on GitHub Abstract This paper proposes adding five overload sets to the standard library for addition, subtraction, multiplication, division, and square root calculation, correctly rounded as specified in ISO/IEC 60559:2020.
	P3899R1	Clarify the behavior of floating-point overflow	J. Schultke, M. Kretz	SG6
Intent Proposal Mailing Date 2026-02 Pre-Croydon Author(s) Jan Schultke, Matthias Kretz Target Audience SG6 Revisions R3 R2 Tracking issue View on GitHub Abstract The current specification of floating-point overflow is unclear. Floating-point overflow occurs when finite operands are used as operands, and the result cannot be represented as a finite value. For [[ISO/IEC 60559:2020]](https://www%2eiso%2eorg/standard/80985%2ehtml) floating-point numbers, this results in infinity.
	P3938R1	Values of floating-point types	J. Schultke	SG6
Intent Proposal Mailing Date 2026-02 Pre-Croydon Author(s) Jan Schultke Target Audience SG6 Tracking issue View on GitHub Abstract The core language wording in the C++ standard does not specify what values a floating-point type may represent. There are a few questions that have no obvious answer:
	P4010R0	Add funnel shift operations to bit header	D. Towner	SG6
Intent Proposal Mailing Date 2026-02 Pre-Croydon Author(s) Daniel Towner Target Audience SG6 Revisions R1 Tracking issue View on GitHub Abstract This paper proposes adding funnel shift operations to the C++ standard library. Funnel shifts concatenate two integer values, shift the concatenated result, and extract bits. This is a fundamental primitive bit operation with widespread use across many domains including cryptography, hashing, compression, and pseudo-random number generation.
	P4016R0	Canonical Parallel Reduction: A Fixed Expression Structure for Run-To-Run Consistency	A. Drakeford	SG6 SG18
Intent Proposal Mailing Date 2026-02 Pre-Croydon Author(s) Andrew Drakeford Target Audience SG6 SG18 Tracking issue View on GitHub Abstract This paper proposes semantics only. It seeks LEWG validation of the fixed expression structure defined in §4 before committing to API design. This proposal introduces no algebraic requirements on `binary_op`

Showing 7 of 7 papers · source: open-std.org

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