Function UnpackDouble

src/codec/memcomparable_format.h:301–306

Function of type rdb_index_field_unpack_t Unpack a double by doing the reverse action of ChangeDoubleForSort (sql/filesort.cc). Note that this only works on IEEE values. Note also that this code assumes that NaN and +/-Infinity are never allowed in the database. */

   allowed in the database.
*/
__attribute__((unused)) static int UnpackDouble(const void *src, void *dst) {
    static double zero_val = 0.0;
    static const uchar zero_pattern[8] = {128, 0, 0, 0, 0, 0, 0, 0};
    return UnpackFloatingPoint(src, sizeof(double), DBL_EXP_DIG, zero_pattern,
                               (const uchar *)&zero_val, SwapDoubleBytes, dst);
}

/*
   Read the next @param size bytes.