WG21 PAPERS

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Select	Paper	Title	Authors	Audience	Doc Date	Mailing Date
	P3211R1	views::flat_map	Hewill Kang H. Kang	LEWG LWG SG9	2025-07-04	2025-07
Doc Date 2025-07-04 Mailing Date 2025-07 Post-Sofia Author(s) Hewill Kang Target Audience LEWG LWG SG9 Revisions R3 R2 Tracking issue View on GitHub Abstract We propose `views::flat_map`, a range adaptor that applies a function returning a range for each element, then flattens the result. This pattern, commonly known as flat mapping, is widespread in functional programming and data processing. Providing it as a dedicated view improves readability and expressiveness, and also opens opportunities for optimization in lazy evaluation contexts.
	P3216R1	views::slice	Hewill Kang H. Kang	LEWG LWG SG9	2025-06-29	2025-07
Doc Date 2025-06-29 Mailing Date 2025-07 Post-Sofia Author(s) Hewill Kang Target Audience LEWG LWG SG9 Revisions R4 R3 Tracking issue View on GitHub Abstract This paper proposes the Tier 1 adaptor `views::slice` (as described in [P2760](https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2023/p2760r1.html)) to enhance the C++29 ranges library. Notably, this is the first standard range adaptor that accepts two arguments — `start` and `end` — to specify the interval [`start`, `end`) for slicing a range.
	P3220R1	views::take_before	Hewill Kang H. Kang	DG LEWG LWG SG9	2025-06-23	2025-07
Doc Date 2025-06-23 Mailing Date 2025-07 Post-Sofia Author(s) Hewill Kang Target Audience DG LEWG LWG SG9 Revisions R3 Tracking issue View on GitHub Abstract This paper proposes the Tier 1 adaptor in [P2760](https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2023/p2760r1.html): `views::delimit`, which is renamed into `views::take_before` along with its corresponding view class to improve the C++29 ranges facilities.
	P3741R0	views::set_operations	Hewill Kang H. Kang	SG9	2025-06-22	2025-07
Doc Date 2025-06-22 Mailing Date 2025-07 Post-Sofia Author(s) Hewill Kang Target Audience SG9 Revisions R1 Tracking issue View on GitHub Abstract This paper proposes four range adaptors for set operations rated as Tier 3 in [P2760](https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2023/p2760r1.html), namely `views::set_difference`, `views::set_intersection`, `views::set_union`, and `views::set_symmetric_difference`, to extend the breadth of Ranges.
	P3757R0	Remove value-type invocability requirement from indirect unary callable concepts	Hewill Kang H. Kang	LEWG LWG SG9	2025-06-22	2025-07
Doc Date 2025-06-22 Mailing Date 2025-07 Post-Sofia Author(s) Hewill Kang Target Audience LEWG LWG SG9 Tracking issue View on GitHub Abstract This is the follow up of [P2997](https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2024/p2997r1.html).
	P3763R0	Remove redundant reserve_hint members from view classes	Hewill Kang H. Kang	LEWG LWG SG9	2025-06-21	2025-07
Doc Date 2025-06-21 Mailing Date 2025-07 Post-Sofia Author(s) Hewill Kang Target Audience LEWG LWG SG9 Tracking issue View on GitHub Abstract This paper removes the `reserve_hint` members of view classes when their `size` members are already provided.

Showing 6 of 6 papers · source: open-std.org

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