code: def clear(self, decorated_function=None):
  		
  		if decorated_function is not None and decorated_function in self._storage:
  			self._storage.pop(decorated_function)
  		else:
  			self._storage.clear()
  
  		if self.__statistic is True:
  			self.__cache_missed = 0
  			self.__cache_hit = 0
docs: :meth:`WCacheStorage.clear` method implementation (Clears statistics also)