Web Reference: Jan 2, 2025 · For each bit in the value representation of the result that is indeterminate, the smallest object containing that bit has an indeterminate value; the behavior is undefined unless that object is of an uninitialized-friendly type. The result does not otherwise contain any indeterminate values. Nov 21, 2018 · Well, there is one obvious reason: because it wouldn't do everything that bit_cast does. Even in the C++20 world where we can allocate memory at compile time, reinterpret_cast is forbidden in constexpr functions. Dec 24, 2025 · std::bit_cast, defined in the header, was added in C++20 to solve the type aliasing problem for bitwise conversions. Its mission: copy the bit pattern of a source object into a destination object of a different type, with well-defined behavior.
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