Adds std::is_within_lifetime to check which union member is active during constant evaluation.
Other papers in Library constexpr-ification (C++26)
P1383R2More
constexpr for constexpr Stable SortingVarna 2023P3309R3constexpr atomic and atomic_refWrocław 2024P3369R0constexpr for uninitialized_default_constructWrocław 2024P3508R0Wording for "constexpr for specialized memory algorithms"Wrocław 2024P3372R3constexpr containers and adaptorsHagenberg 2025All 12 papers in Library constexpr-ification (C++26) →