P2183 Executors Review Report: Properties

[wg21bot]

P2183R0 Executors Review: Properties (David Olsen, Ruslan Arutyunyan, Michael J. Voss, Michał Dominiak, Chris Kohlhoff, D.S. Hollman, Kirk Shoop, Inbal Levi)

[billy-baker]

2020-07-27 and 2020-08-04 Library Evolution Review

2020-07-27 and 2020-08-04 Library Evolution Minutes - P2183R0 Executors Review Report: Properties

Chair: Ben Craig and Billy Baker

Champion: David Olsen

Minute Taker: Inbal Levi

Summary

The following poll was taken regarding RTTI overhead from any_executor<P...>::target_type (section 5.6 of P2183 Executor Review: Properties).

POLL: We should remove any_executor<P...>::target_typ.

Strongly Favor	Weakly Favor	Neutral	Weakly Against	Strongly Against
3	4	7	0	0

Attendance: 28

# of Authors: 2

Author Position: neutral

Outcome

We had consensus for removing target_type from any_executor to eliminate RTTI-related overhead. This removal is consistent with recent decisions to not include target/target_type in any_invocable (see the discussion of P0288 any_invocable from San Diego 2018). P1322 Networking TS enhancement presents a case for using target_type. The authors of P0433R13 are encouraged to explore the properties approach shown in P2183 as well as other alternatives such as the unchecked any_cast possibility raised during the presentation of P2183.