def call_decorator(cls, func):
        """class function that MUST be specified as decorator
        to the `__call__` method overriden by sub-classes.
        """

        @wraps(func)
        def _wrap(self, *args, **kwargs):
            try:
                return func(self, *args, **kwargs)
            except Exception:
                self.logger.exception('While executing benchmark')
                if not (self.catch_child_exception or False):
                    raise

        return _wrap