public Arc(Vertex tail, Vertex head)
{
if (head == tail) {
Console.WriteLine("No loops allowed!");
this.head = this.tail = null;
}
else {
this.head = head;
this.tail = tail;
}
}
public FriendlyConstraint(Vertex tail, Vertex head)
: base(tail, head)
{
}
public EnemyConstraint(Vertex tail, Vertex head)
: base(tail, head)
{
}
public Boolean Equals(Vertex x)
{
return (this.idx == x.idx);
}