Function BytesForBits

cpp/src/arrow/util/bit_util.h:52–55

Return the number of bytes needed to fit the given number of bits

// Return the number of bytes needed to fit the given number of bits
constexpr int64_t BytesForBits(int64_t bits) {
  // This formula avoids integer overflow on very large `bits`
  return (bits >> 3) + ((bits & 7) != 0);
}

// Returns the smallest power of two that contains v.  If v is already a
// power of two, it is returned as is.