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
	P3642R4	Carry-less product: std::clmul	J. Schultke	LEWG
Intent Proposal Mailing Date 2026-02 Pre-Croydon Author(s) Jan Schultke Target Audience LEWG Revisions R6 R5 Tracking issue View on GitHub Abstract [Carry-less multiplication](https://en.wikipedia.org/wiki/Carry-less_product) is a simple numerical operation on unsigned integers. It can be a seen as a regular multiplication where `xor` is being used as a reduction instead of `+`.
	P3666R3	Bit-precise integers	J. Schultke	EWG LEWG
Intent Proposal Mailing Date 2026-02 Pre-Croydon Author(s) Jan Schultke Target Audience EWG LEWG Revisions R4 Tracking issue View on GitHub Abstract In distant history, there have been various attempts at standardizing multi-precision integers in C++, such as [[N1692]](https://wg21%2elink/n1692) "A Proposal to add the Infinite Precision Integer to the C++ Standard Library", [[N1744]](https://wg21%2elink/n1744) "Big Integer Library Proposal for C++0x", and [[N4038]](https://wg21%2elink/n4038) "Proposal for Unbounded-Precision Integer Types", al
	P3688R6	ASCII character utilities	J. Schultke, C. Jabot	SG16
Intent Proposal Mailing Date 2026-02 Pre-Croydon Author(s) Jan Schultke, Corentin Jabot Target Audience SG16 Tracking issue View on GitHub Abstract Testing whether a character falls into a specific subset of ASCII characters or performing some simple transformations are common tasks in text processing. For example, applications may need to check if identifiers are comprised of alphanumeric ASCII characters or underscores; Unicode properties are not relevant to this task, and usually, neither are locales.
	P3724R3	Integer division	J. Schultke	LEWG
Intent Proposal Mailing Date 2026-02 Pre-Croydon Author(s) Jan Schultke Target Audience LEWG Revisions R4 Tracking issue View on GitHub Abstract C++ currently only offers truncating integer division in the form of the `/` operator. However, other rounding modes have various use cases too, and implementing these as the user can be surprisingly hard, especially when integer overflow needs to be avoided, and negative inputs are accepted.
	P3737R3	std::array is a wrapper for an array!	J. Schultke	LEWG
Intent Proposal Mailing Date 2026-02 Pre-Croydon Author(s) Jan Schultke Target Audience LEWG Revisions R4 Tracking issue View on GitHub Abstract The `std::array` class template has established itself as a de-facto replacement for "builtin arrays" or "C-style arrays" in many code bases. This also means that it is frequently taught to novice programmers, with an explanation along the lines of:
	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.
	P3876R1	Extending <charconv> support to more character types	J. Schultke, P. Bindels	SG16
Intent Proposal Mailing Date 2026-02 Pre-Croydon Author(s) Jan Schultke, Peter Bindels Target Audience SG16 Revisions R2 Tracking issue View on GitHub Abstract Support for `char8_t` and other Unicode character types in `std::to_chars` and `std::from_chars` is clearly useful. File formats such as JSON require the use of Unicode character encodings, so an application that deals with JSON may want to use `char8_t` in its APIs and internally. However, when attempting to use `char8_t` for this purpose, one quickly runs into problems:
	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:
	P3969R0	Fixing std::bit_cast of types with padding bits	J. Schultke	LEWG
Intent Proposal Mailing Date 2026-02 Pre-Croydon Author(s) Jan Schultke Target Audience LEWG Revisions R2 R1 Tracking issue View on GitHub Abstract The following use of `std::bit_cast` has undefined behavior at compile time:

Showing 10 of 10 papers · source: open-std.org

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