WG21 PAPERS

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Select	Paper	Title	Authors	Audience	Doc Date	Mailing Date
	P3100R9	A framework for systematically addressing undefined behaviour in the C++ Standard	Timur Doumler T. Doumler , Joshua Berne J. Berne	EWG LEWG	2026-10-23	2026-10
Doc Date 2026-10-23 Mailing Date 2026-10 Pre-Búzios Author(s) Timur Doumler, Joshua Berne Target Audience EWG LEWG Revisions R8 R7 R6 R3 Tracking issue View on GitHub Abstract In this paper, we enumerate all cases of core language undefined behaviour explicitly specified in the C++ Standard, group them into ten categories, and classify them along a number of relevant criteria.
	P3400R5	Controlling Contract-Assertion Properties	Joshua Berne J. Berne	EWG	2026-10-23	2026-10
Doc Date 2026-10-23 Mailing Date 2026-10 Pre-Búzios Author(s) Joshua Berne Target Audience EWG Revisions R4 R3 Tracking issue View on GitHub Abstract C++26 Contracts, adopted with [P2900R14], provides a framework for specifying and checking contract assertions whose behavior is controlled through implementation-defined build configurations. This paper introduces assertion-control objects — compile-time objects, composed from `constexpr` labels, that let developers customize contract-assertion behavior directly in C++ source code. Labels p
	P4277R1	Overview and Implementation Report for P3100	Joshua Berne J. Berne	EWG	2026-10-23	2026-10
Doc Date 2026-10-23 Mailing Date 2026-10 Pre-Búzios Author(s) Joshua Berne Target Audience EWG Revisions R0 Tracking issue View on GitHub
	P4284R1	Addenda to the Undefined Behavior and IFNDR Annexes	Joshua Berne J. Berne	CWG	2026-10-23	2026-10
Doc Date 2026-10-23 Mailing Date 2026-10 Pre-Búzios Author(s) Joshua Berne Target Audience CWG Revisions R0 Tracking issue View on GitHub Abstract [P3596R3] introduced a pair of new annexes to the C++ Standard containing full catalogues of undefined behavior and ill-formed, no-diagnostic required constructs. That paper was current and complete when it was approved to be merged into the draft Standard in Brno, but it was also instantly out of date due to other papers that landed concurrently at the same meeting. In addition, new eyes on the c
	P4388R0	Ship C++26	Joshua Berne J. Berne	WG21	2026-09-29	2026-10
Doc Date 2026-09-29 Mailing Date 2026-10 Pre-Búzios Author(s) Joshua Berne Target Audience WG21 Abstract WG21 expended great energy producing a high-quality Draft International Standard (DIS) for approval by national bodies to be published as C++26. No new technical concerns with that draft have been raised, hence we propose submitting that draft for publication and allowing the community to reliably benefit from the results of everything the committee has worked hard to produce.
	P4433R0	Do not remove Contracts from C++26	Timur Doumler T. Doumler , Joshua Berne J. Berne , Gašper Ažman G. Ažman , Peter Bindels P. Bindels , Peter Dimov P. Dimov , Eric Fiselier E. Fiselier , Fabio Fracassi F. Fracassi , Pablo Halpern P. Halpern , Tom Honermann T. Honermann , John Lakos J. Lakos , Nevin Liber N. Liber , Lisa Lippincott L. Lippincott , René Ferdinand Rivera Morell R. Morell , Oliver Rosten O. Rosten , Jan Schultke J. Schultke , Hui Xie H. Xie	EWG	2026-10-23	2026-10
Doc Date 2026-10-23 Mailing Date 2026-10 Pre-Búzios Author(s) Timur Doumler, Joshua Berne, Gašper Ažman, Peter Bindels, Peter Dimov, Eric Fiselier, Fabio Fracassi, Pablo Halpern, Tom Honermann, John Lakos, Nevin Liber, Lisa Lippincott, René Ferdinand Rivera Morell, Oliver Rosten, Jan Schultke, Hui Xie Target Audience EWG Abstract In addition, the description of C++26 contract assertions given in [[P4334R0](http://wg21.link/p4334r0)] contains a number of inaccuracies. It misrepresents the specification itself,3 the amount of wording it consists of,4 its design intent,5 how it relates to hardening6 and static analysis,7 its existing implementations,8 existing practice,9 teachability,10 and proposed extensions.11 None of the

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