WG21 PAPERS

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Select	Paper	Title	Authors	Audience	Doc Date	Mailing Date
	P4246R0	Transcoding Text Views and Ranges for WhatWG and iconv	Steve Downey S. Downey	SG9 SG16 SG18	2026-09-23	2026-10
Doc Date 2026-09-23 Mailing Date 2026-10 Pre-Búzios Author(s) Steve Downey Target Audience SG9 SG16 SG18 Abstract > “It seems like a really messy situation and you’re proposing to inherit that mess into the C++ standard.” — Jan Schultke [Schultke]
	P4270R0	Free Value Or Else	Steve Downey S. Downey	LEWG	2026-10-23	2026-10
Doc Date 2026-10-23 Mailing Date 2026-10 Pre-Búzios Author(s) Steve Downey Target Audience LEWG Abstract This paper proposes the member functions `value_or_construct` and `value_or_else` of [P3413R0] on `std::optional` and `std::expected`, which build the alternative only when it is needed, and the free functions `value_or`, `reference_or`, `or_invoke`, and `or_construct` over any type modeling a `nullable` concept, with the result type computed as the `common_type` or `common_reference` of the conta
	P4280R0	Expected over References	Steve Downey S. Downey	LEWG	2026-10-23	2026-10
Doc Date 2026-10-23 Mailing Date 2026-10 Pre-Búzios Author(s) Steve Downey Target Audience LEWG Abstract A function that can fail and otherwise returns a reference has no good return type today. `expected<T*,` `E>` lets a null pointer through as a success, and `expected<reference_wrapper<T>,` `E>` exposes the wrapper at every use. An error that is owned elsewhere, by a diagnostics engine or an error registry, has the same problem in the error position. We propose that `std::expected` hold an lvalue r
	P4307R1	An Infix Operator and a Keyword Escape for C++	Steve Downey S. Downey	EWG	2026-10-23	2026-10
Doc Date 2026-10-23 Mailing Date 2026-10 Pre-Búzios Author(s) Steve Downey Target Audience EWG Revisions R0 Tracking issue View on GitHub Abstract C++ reserves non-strict evaluation to a fixed set of built-ins: ‘&&‘, ‘\|\|‘ and ‘?:‘. The comma operator is the near neighbor, and is not one of them: it evaluates both of its operands, and what it fixes is the sequencing. Overloading does not get non-strict evaluation back: an overloaded ‘operator&&‘ evaluates both operands, which is the trap everyone has been bitten by, and the reason the sta
	P4345R1	Extending C++ with Unicode Mathematical Operators	Steve Downey S. Downey	EWG SG16	2026-10-23	2026-10
Doc Date 2026-10-23 Mailing Date 2026-10 Pre-Búzios Author(s) Steve Downey Target Audience EWG SG16 Revisions R0 Tracking issue View on GitHub Abstract I propose adding the ability to declare user defined operators, such as operator⊞, allowing users to write `a` `⊞` `b`. The list of allowed operators is drawn from the mathematical operators described in Unicode Technical Report #25, Unicode Support for Mathematics (Beeton, Freytag, and Sargent III 2017), with confusables removed. [The operators are otherwise normal functions, found by ord
	P4346R1	std::movable_box: Give Users the Ranges Movable Wrapper	Steve Downey S. Downey	LEWG LWG	2026-10-23	2026-10
Doc Date 2026-10-23 Mailing Date 2026-10 Pre-Búzios Author(s) Steve Downey Target Audience LEWG LWG Revisions R0 Tracking issue View on GitHub Abstract The exposition-only class template movable-box is the workhorse of the range adaptors. It is how the standard library stores a predicate, a projection, or a value inside a view type and still satisfies the assignability the `view` concept demands. Every implementation ships one. Every ranges-adjacent library reimplements one. Anyone writing a conforming view outside the standard library must wri
	P4386R0	Slides for SG16 - P4345R0	Steve Downey S. Downey	SG16	2026-09-23	2026-10
Doc Date 2026-09-23 Mailing Date 2026-10 Pre-Búzios Author(s) Steve Downey Target Audience SG16
	P4387R0	Slides for SG16 - P4345R0	Steve Downey S. Downey	SG16	2026-09-23	2026-10
Doc Date 2026-09-23 Mailing Date 2026-10 Pre-Búzios Author(s) Steve Downey Target Audience SG16

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