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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.
	P3411R3	`any_view`	Hui Xie H. Xie , S. Levent Yilmaz S. Yilmaz , Louis Dionne L. Dionne , Patrick Roberts P. Roberts	LEWG SG9	2025-06-19	2025-07
Doc Date 2025-06-19 Mailing Date 2025-07 Post-Sofia Author(s) Hui Xie, S. Levent Yilmaz, Louis Dionne, Patrick Roberts Target Audience LEWG SG9 Revisions R6 R5 Tracking issue View on GitHub Abstract This paper proposes a new type-erased view: `std::ranges::any_view`. That type-erased view allows customizing the traversal category of the view, its value type and a few other properties. For example:
	P3705R2	A Sentinel for Null-Terminated Strings	Eddie Nolan E. Nolan	LEWG SG9	2025-06-19	2025-07
Doc Date 2025-06-19 Mailing Date 2025-07 Post-Sofia Author(s) Eddie Nolan Target Audience LEWG SG9 Revisions R1 Tracking issue View on GitHub Abstract Consider using `std::views::take` to get the first five characters from a string. If we pass a string literal with five or more characters, it looks okay:
	P3709R2	Reconsider parallel ranges::rotate_copy and ranges::reverse_copy	Ruslan Arutyunyan R. Arutyunyan , Alexey Kukanov A. Kukanov	LEWG SG9	2025-06-17	2025-07
Doc Date 2025-06-17 Mailing Date 2025-07 Post-Sofia Author(s) Ruslan Arutyunyan, Alexey Kukanov Target Audience LEWG SG9 Revisions R1 Tracking issue View on GitHub Disposition Date 2025-06Adopted Abstract This paper proposes changing the return value type for parallel `ranges::rotate_copy` and `ranges::reverse_copy` in [[P3179R9]](https://isocpp.org/files/papers/P3179R9.html).
	P3725R1	Filter View Extensions for Input Ranges	Nicolai Josuttis N. Josuttis	LEWG LWG SG9	2025-06-23	2025-07
Doc Date 2025-06-23 Mailing Date 2025-07 Post-Sofia Author(s) Nicolai Josuttis Target Audience LEWG LWG SG9 Revisions R3 R2 R0 Tracking issue View on GitHub Abstract Using filter views is both risky and non-intuitive. Let us look at some typical use cases.
	P3732R0	Numeric Range Algorithms	Ruslan Arutyunyan R. Arutyunyan , Mark Hoemmen M. Hoemmen , Alexey Kukanov A. Kukanov , Bryce Adelstein Lelbach B. Lelbach , Abhilash Majumder A. Majumder	SG1 SG9	2025-06-27	2025-07
Doc Date 2025-06-27 Mailing Date 2025-07 Post-Sofia Author(s) Ruslan Arutyunyan, Mark Hoemmen, Alexey Kukanov, Bryce Adelstein Lelbach, Abhilash Majumder Target Audience SG1 SG9 Revisions R2 Tracking issue View on GitHub Abstract We propose `ranges` algorithm overloads (both parallel and non-parallel) for the `<numeric>` header.
	P3734R0	Not all predicates must be regular	Jan Schultke J. Schultke	SG9	2025-06-14	2025-07
Doc Date 2025-06-14 Mailing Date 2025-07 Post-Sofia Author(s) Jan Schultke Target Audience SG9 Tracking issue View on GitHub Abstract Some algorithms, such as `std::remove_if` and `std::copy_if` are over-constrained by requiring the predicate to be regular, despite the predicate visiting elements exactly once, making the requirement meaningless. These constraints should be relaxed.
	P3735R0	partial_sort_n, nth_element_n	Jan Schultke J. Schultke	SG9	2025-06-28	2025-07
Doc Date 2025-06-28 Mailing Date 2025-07 Post-Sofia Author(s) Jan Schultke Target Audience SG9 Tracking issue View on GitHub Abstract The `partial_sort`, and `nth_element` algorithms require the user to "manually offset" iterators, which is neither ergonomic nor safe. I propose `_n` variants of these algorithms in the style of `shift_left`.
	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 13 of 13 papers · source: open-std.org

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