Neos\Flow\Validation\Validator\GenericObjectValidator::isValidatedAlready PHP Method

    protected function isValidatedAlready($object)
    {
        if ($this->validatedInstancesContainer === null) {
            $this->validatedInstancesContainer = new \SplObjectStorage();
        }
        if ($this->validatedInstancesContainer->contains($object)) {
            return true;
        } else {
            $this->validatedInstancesContainer->attach($object);
            return false;
        }
    }