public bool MoveNext()
{
if (current == null || first == null)
{
current = first;
return(current != null);
}
current = current.next;
return(current != null);
}
public void Add(T item)
{
var newIt = new RestrictedQueueContainer <T>(item)
{
prev = null, next = null
};
if (length == 0 || maxQueueLength == 1)
{
first = newIt;
last = newIt;
if (length < maxQueueLength)
{
length++;
}
return;
}
if (length == 1)
{
first.next = newIt;
newIt.prev = first;
last = newIt;
length++;
return;
}
if (length == maxQueueLength)
{
first.next.prev = null;
first = first.next;
}
else
{
length++;
}
last.next = newIt;
newIt.prev = last;
last = newIt;
}
public T DequeueLast()
{
if (last == null)
{
return(default(T));
}
if (length == 1)
{
var item = last.item;
last = null;
first = null;
current = null;
length = 0;
return(item);
}
var lastValue = last.item;
var prevLast = last.prev;
prevLast.next = null;
last = prevLast;
length--;
return(lastValue);
}
public void Clear()
{
length = 0;
first = null;
last = null;
}
public void Reset()
{
current = null;
}
public void Dispose()
{
length = 0;
first = null;
last = null;
}
