WG21 PAPERS

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Filter and export papers from the C++ Committee’s monthly mailings by time frame and audience using the options below, or refine your export further with the Select button. Links point directly to the official WG21 papers on open-std.org.

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	Paper	Title	Authors	Audience
	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
	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.
	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 8 of 8 papers · source: open-std.org

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