code: def free_operator(
              self,
              name=None,
              function=None,
              symbol=None,
              return_type=None,
              arg_types=None,
              header_dir=None,
              header_file=None,
              recursive=None):
          
          return (
              self._find_single(
                  scopedef.scopedef_t._impl_matchers[namespace_t.free_operator],
                  name=self._build_operator_name(name, function, symbol),
                  symbol=symbol,
                  function=self._build_operator_function(name, function),
                  decl_type=self._impl_decl_types[namespace_t.free_operator],
                  return_type=return_type,
                  arg_types=arg_types,
                  header_dir=header_dir,
                  header_file=header_file,
                  recursive=recursive)
          )
docs: Returns reference to free operator declaration that matches
          a defined criteria.