WG21 PAPERS

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Select	Paper	Title	Authors	Audience	Doc Date	Mailing Date
	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
	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

Showing 3 of 3 papers · source: open-std.org

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