WG21 PAPERS

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	Paper	Title	Authors	Audience
	P2728R14	Unicode in the Library, Part 1: UTF Transcoding	E. Nolan	LEWG SG9 SG16
Mailing Date 2026-07 Post-Brno Author(s) Eddie Nolan Target Audience LEWG SG9 SG16 Revisions R13 R12 R11 Tracking issue View on GitHub
	P3211R2	views::flat_map	H. Kang	LEWG LWG SG9
Mailing Date 2026-07 Post-Brno Author(s) Hewill Kang Target Audience LEWG LWG SG9 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.
	P3216R3	views::slice	H. Kang	LEWG LWG SG9
Mailing Date 2026-07 Post-Brno Author(s) Hewill Kang Target Audience LEWG LWG SG9 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.
	P3220R3	views::take_before	H. Kang	DG LEWG LWG SG9
Mailing Date 2026-07 Post-Brno Author(s) Hewill Kang Target Audience DG LEWG LWG SG9 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.
	P3230R3	views::unchecked_(take\|drop)	H. Kang	LEWG LWG SG9
Mailing Date 2026-07 Post-Brno Author(s) Hewill Kang Target Audience LEWG LWG SG9 Tracking issue View on GitHub Abstract This paper proposes two Tier 1 adaptors in [P2760](https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2023/p2760r1.html): `views::unchecked_drop` and `views::unchecked_take`, cousins of `drop` and `take`, to improve the C++26 ranges facilities, which were renamed to `views::unchecked_take` and `views::unchecked_drop` after Tokyo WG21, as "unchecked" better describes the utility's nature than "exa
	P3741R1	views::set_operations	H. Kang	SG9
Mailing Date 2026-07 Post-Brno Author(s) Hewill Kang Target Audience SG9 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.
	P3806R1	views::cycle	H. Kang	LEWG LWG SG9
Mailing Date 2026-07 Post-Brno Author(s) Hewill Kang Target Audience LEWG LWG SG9 Tracking issue View on GitHub Abstract This paper proposes adding `views::cycle`, a Tier 1 range adaptor as described in [P2760](https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2023/p2760r1.html), to enhance the C++29 Ranges library by enabling infinite repetition of a range's elements.
	P3928R1	static_sized_range	H. Kang	LEWG LWG SG9
Mailing Date 2026-07 Post-Brno Author(s) Hewill Kang Target Audience LEWG LWG SG9 Tracking issue View on GitHub Abstract This paper introduces `static_sized_range`, a refinement of `sized_range` for ranges whose sizes are known at compile time.
	P4030R1	Endian Views	E. Nolan	LEWG SG9 SG16
Mailing Date 2026-07 Post-Brno Author(s) Eddie Nolan Target Audience LEWG SG9 SG16 Revisions R0 Tracking issue View on GitHub Abstract The main reason for adding these views is to assist users of the UTF transcoding range adaptors (see [[P2728R11]](https://wg21.link/p2728r11)). That paper introduces the adaptors `to_utf8`, `to_utf16`, and `to_utf32`, which take as input ranges of `char8_t`, `char16_t`, and `char32_t`. The input and output of these views use native endianness. But users often need to convert to and from UTF encodi
	P4243R0	`zip()` Should Be Ill-formed	H. Xie, T. Melen	LEWG SG9
Mailing Date 2026-07 Post-Brno Author(s) Hui Xie, Tristan Melen Target Audience LEWG SG9 Tracking issue View on GitHub Abstract This paper proposes a fix that makes the `views::zip()` ill-formed instead of the current `views::empty<tuple<>>`.
	P4291R0	views::unique	H. Kang	LEWG LWG SG9
Mailing Date 2026-07 Post-Brno Author(s) Hewill Kang Target Audience LEWG LWG SG9 Tracking issue View on GitHub Abstract This paper proposes a range adaptor `views::unique` that filters out consecutive equivalent elements from a range, leaving only one element from each group of consecutive equivalent elements. This adaptor complements the existing `std::unique` algorithm by providing a composable, lazy, and allocation-free view for a common filtering operation.
	P4294R0	views::take_last and views::drop_last	H. Kang	LEWG LWG SG9
Mailing Date 2026-07 Post-Brno Author(s) Hewill Kang Target Audience LEWG LWG SG9 Tracking issue View on GitHub Abstract This paper proposes two new range adaptors, `views::take_last` and `views::drop_last`, that respectively produce the last N elements of a range and all-but-the-last N elements of a range. They mirror the shape of the existing `views::take` / `views::drop` adaptors and fill an obvious gap in the standard range adaptor set.

Showing 12 of 12 papers · source: open-std.org

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