Function ZigZagEncode64

library/cpp/yt/coding/zig_zag-inl.h:25–30

}

inline ui64 ZigZagEncode64(i64 n)
{
    // Note:  the right-shift must be arithmetic.
    // Note:  left shift must be unsigned because of overflow.
    return (static_cast<ui64>(n) << 1) ^ static_cast<ui64>(n >> 63);
}

inline i64 ZigZagDecode64(ui64 n)
{