A new function (instead of bit_cast) would be needed, if one wants to do that. -----Ursprüngliche Nachricht----- Von:Jan Schultke <janschultke_at_[hidden]> Gesendet:Fr 16.01.2026 16:35 Betreff:Re: [std-proposals] Fixing std::bit_cast padding bit issues An:std-proposals_at_[hidden]; CC:Sebastian Wittmeier <wittmeier_at_[hidden]>; I think the only solution is to create or use wider types, where the padding bits are part of the value representation. How does that fix the problem of bit-casting long double to __int128? If the destination type was wider, you couldn't bit-cast (constraints not satisfied). The destination type has no padding bits, yet the cast is an alternative spelling for std::unreachable().