Gliph\Graph\DirectedAdjacencyList::isAcyclic PHP Method

    public function isAcyclic()
    {
        // The DepthFirstToposortVisitor throws an exception on cycles.
        try {
            DepthFirst::traverse($this, new DepthFirstToposortVisitor());
            return TRUE;
        } catch (RuntimeException $e) {
            return FALSE;
        }
    }