code: def ctype_class(self):
          
          def struct_factory(field_types):
              """Summary
  
              Args:
                  field_types (TYPE): Description
  
              Returns:
                  TYPE: Description
              """
              class Struct(Structure):
                  """Summary
                  """
                  _fields_ = [(str(i), t.ctype_class)
                              for i, t in enumerate(field_types)]
              return Struct
  
          if frozenset(self.field_types) not in WeldVec._singletons:
              WeldStruct._singletons[
                  frozenset(self.field_types)] = struct_factory(self.field_types)
          return WeldStruct._singletons[frozenset(self.field_types)]
docs: Summary
  
          Returns:
              TYPE: Description