public T PopBack()
{
if (Empty)
{
throw new Exception("DEQUE empty.");
}
last.Previous.Next = null;
DoublyLinkedElement <T> temp = last;
last = last.Previous;
return(temp.Valor);
}
public T PopFront()
{
if (Empty)
{
throw new Exception("DEQUE empty.");
}
first.Next.Previous = null;
DoublyLinkedElement <T> temp = last;
first = first.Next;
return(temp.Valor);
}
public void PushFront(T valor)
{
if (valor == null)
{
throw new Exception("Invalid value: null");
}
DoublyLinkedElement <T> element = new DoublyLinkedElement <T>(valor);
if (Empty)
{
last = element;
}
else
{
first.Previous = element;
element.Next = first;
}
first = element;
}
