public void Deconstruct(out AbstractVertex fromVertex, out AbstractVertex toVertex) => (fromVertex, toVertex) = (FromVertex, ToVertex);
public AdjacentVertices(AbstractVertex fromVertex, AbstractVertex toVertex)
{
FromVertex = fromVertex != null ? fromVertex : throw new ArgumentNullException(nameof(fromVertex));
ToVertex = toVertex != null ? toVertex : throw new ArgumentNullException(nameof(toVertex));
}