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CWG3123 Global lookup for begin and end for expansion statements P4026 #2615
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[-]CWG3123 Global lookup for begin and end for expansion statements[/-][+]CWG3123 Global lookup for begin and end for expansion statements P4026[/+]on Mar 11, 2026 EWG in Croydon
Approve the approach of P4026R0 (CWG-3123 'Global lookup for begin and end for expansion statements') of just "viable candidate" as the solution to CWG-3123 and forward back to CWG for C++26.
SF F N A SA 3 22 4 0 0 Result: consensus in favor
CWG 2026-03-24 in Croydon: Approved CWG3123 for plenary straw poll.
As currently specified,
std::tupleis considered expansion-iterable (which causes a failure when actually expanding), but it should be considered expansion-destructurable instead.CWG selected an approach for CWG3123 that solves the issue, but has a set of drawbacks different from the currently-specified approach.
EWG is asked to confirm CWG's decision or offer a different approach.