loop in the linked list

gistfile1.txt

bool hasLoop(list *head)
{
list *slow, *fast;
slow = fast = head;

while (slow && fast )
{
 slow = slow->next;
 fast = fast->next;

 if (fast)
     fast = fast->next;
 else
     return false;  //dead end

 if (slow == fast)  //loop detected
     return true;
}

return false;
}