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Paper Title Authors Audience Doc Date
P4190R0 Restore span's initializer_list constructor for C++29 M. Hoemmen, H. Dusíková, R. Parolin
LEWG
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Mailing Date 2026-04 Post-Croydon
Author(s) Mark Hoemmen, Hana Dusíková, Rob Parolin
Target Audience LEWG
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Abstract [P4144R1](https://isocpp.org/files/papers/P4144R1.html) reverted [P2447R6](https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2023/p2447r6.html) by removing `span`’s `initializer_list` constructor. We propose to add it back in C++29, but with constraints this time, in order to avoid the unfortunate conversions that led to its removal.
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