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Select	Paper	Title	Authors	Audience	Doc Date	Mailing Date
	P3570R2	optional variants in sender/receiver	Fabio Fracassi F. Fracassi	LWG	2025-06-18	2025-07
Doc Date 2025-06-18 Mailing Date 2025-07 Post-Sofia Author(s) Fabio Fracassi Target Audience LWG Tracking issue View on GitHub Disposition Date 2025-06Adopted Abstract Some async interfaces for concurrent queues would be well served by using `std::optional` when used in a coroutine context. However when using sender/receiver interfaces directly the variant style visitor based on overloading has several benefits. This paper explores if and how we can get the best interface for each use case.

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