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Select	Paper	Title	Authors	Audience	Doc Date	Mailing Date
	P2964R5	Allowing user-defined types in std::simd	Daniel Towner D. Towner , Ruslan Arutyunyan R. Arutyunyan	LEWG SG6		2026-07
Mailing Date 2026-07 Post-Brno Author(s) Daniel Towner, Ruslan Arutyunyan Target Audience LEWG SG6 Revisions R4 R3 R2 Tracking issue View on GitHub Abstract The C++ standard library includes data-parallel types in the `<simd>` header, currently restricting element types to a closed list of built-in vectorizable types: arithmetic types and `std::complex` specializations. This paper proposes a minimal change to the specification in which this list is extended. Firstly, `std::byte` is added to the closed list as a standard library type with fixed seman

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