code: def class_declaration(self, type_):
          
  
          utils.loggers.queries_engine.debug(
              "Container traits: searching class declaration for %s", type_)
  
          cls_declaration = self.get_container_or_none(type_)
          if not cls_declaration:
              raise TypeError(
                  'Type "%s" is not instantiation of std::%s' %
                  (type_.decl_string, self.name()))
          return cls_declaration
docs: Returns reference to the class declaration.