public static bool SetBidirectionalEdge <T>(this IDirectedGraph <T> graph, Vertex <T> firstVertex, Vertex <T> secondVertex, int weight) where T : IEquatable <T>
{
if (graph is null)
{
throw new ArgumentNullException(nameof(graph));
}
return(graph.SetEdge(firstVertex, secondVertex, weight) &&
graph.SetEdge(secondVertex, firstVertex, weight));
}