public T pop_back()
{
if (this.empty())
{
return(default(T));
}
T res = this.last.val;
this.last = this.last.prev;
length--;
return(res);
}
public T pop_front()
{
if (this.empty())
{
return(default(T));
}
T res = this.first.val;
this.first = this.first.next;
length--;
return(res);
}
public void push_front(T x)
{
wezel <T> w = new wezel <T> (x);
if (this.empty())
{
this.first = w;
this.last = w;
this.length++;
}
else
{
w.next = this.first;
this.first.prev = w;
this.first = w;
this.length++;
}
}