Gliph\Graph\AdjacencyList::ensureVertex PHP Méthode

    public function ensureVertex($vertex)
    {
        if (!is_object($vertex)) {
            throw new InvalidVertexTypeException('Vertices must be objects; non-object provided.');
        }
        if (!$this->hasVertex($vertex)) {
            $this->vertices[$vertex] = new \SplObjectStorage();
        }
        return $this;
    }