P3415 R0 Range interface in std::optional breaks code!

[wg21bot]

P3415R0 Range interface in std::optional breaks code! (Andrzej Krzemieński)

[inbal2l]

2024-11-22 Library Evolution Wroclaw Meeting

P3415R0: Range interface in std::optional breaks code!

2024-11-22 Library Evolution Wroclaw Meeting Minutes

Champion: Andrzej Krzemieński
Chair: Fabio Fracassi / Inbal Levi
Minute Taker: Robert Leahy

Summary

POLL: We want to revert our decision to make optional a range (reversion is described in P3415R0).

SF	F	N	A	SA
3	4	6	8	7

Attendance: 29 (IP) + 4 (R)
Author's Position: SF
Outcome: Consensus against

Next Steps

LEWG discussed the breakage of boost.json (as a result of modifiaction in std::optional) and the comparison to Boost.Optional. The discussion resulted with LEWG not considering this as a strong enough motivation to pull the std::optional "range" behaviour, approving existing behaviour (NOT pulling optional range, as applied by P3168, out of C++26).