code: def GetByteSize(self):
      
      if self._byte_size is None and self.members:
        self._byte_size = 0
        for member_definition in self.members:
          if isinstance(member_definition, PaddingDefinition):
            _, byte_size = divmod(
                self._byte_size, member_definition.alignment_size)
            if byte_size > 0:
              byte_size = member_definition.alignment_size - byte_size
  
          else:
            byte_size = member_definition.GetByteSize()
            if byte_size is None:
              self._byte_size = None
              break
  
          self._byte_size += byte_size
  
      return self._byte_size
docs: Retrieves the byte size of the data type definition.
  
      Returns:
        int: data type size in bytes or None if size cannot be determined.