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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Select	Paper	Title	Authors	Audience
	P3982R1	Split strided_slice into extent_slice and range_slice for C++26	T. Kamiński, M. Hoemmen	LEWG
Intent Proposal Mailing Date 2026-04 Post-Croydon Author(s) Tomasz Kamiński, Mark Hoemmen Target Audience LEWG Revisions R2 R0 Tracking issue View on GitHub Abstract Addresses [PL007: Define the extent member of the `strided_slice`](https://github.com/cplusplus/nbballot/issues/816)
	P4144R0	Breaking change in std::span's new initializer_list constructor	M. Hoemmen	LEWG
Intent Proposal Mailing Date 2026-04 Post-Croydon Author(s) Mark Hoemmen Target Audience LEWG Revisions R1 Tracking issue View on GitHub Abstract This paper expresses [LWG4520](https://cplusplus.github.io/LWG/issue4520) and proposes a fix.
	P4150R0	Multidimensional Index-based For Each	N. Morales, M. Hoemmen, B. Lelbach, D. Lebrun-Grandie	LEWG
Intent Proposal Mailing Date 2026-04 Post-Croydon Author(s) Nicolas Morales, Mark Hoemmen, Bryce Adelstein Lelbach, Damien Lebrun-Grandie Target Audience LEWG Tracking issue View on GitHub Abstract \| Before \| After \| \| --- \| --- \| \| `std::ranges::for_each( std::execution::par_unseq, std::views::cartesian_product( std::views::indices(A.extent(0)), std::views::indices(A.extent(1))), [=] (auto idx) { auto [i, j] = idx; B[j, i] = A[i, j]; });` \| `std::for_each_index( std::execution::par_unseq, A.mapping(), [=] (auto i, auto j) { B[j, i] = A[i, j]; });` \|
	P4190R0	Restore span's initializer_list constructor for C++29	M. Hoemmen, H. Dusíková, R. Parolin	LEWG
Intent Proposal Mailing Date 2026-04 Post-Croydon Author(s) Mark Hoemmen, Hana Dusíková, Rob Parolin Target Audience LEWG Tracking issue View on GitHub Abstract [P4144R1](https://isocpp.org/files/papers/P4144R1.html) reverted [P2447R6](https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2023/p2447r6.html) by removing `span`’s `initializer_list` constructor. We propose to add it back in C++29, but with constraints this time, in order to avoid the unfortunate conversions that led to its removal.

Showing 4 of 4 papers · source: open-std.org

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