public LightStack(T element)
{
if ((dynamic)element is null)
{
throw new ArgumentNullException(String.Format("{0} is null", nameof(element)));
}
current = new StackElement <T>(element);
}
public void Push(T element)
{
if (current == null)
{
current = new StackElement <T>(element);
}
else
{
current = new StackElement <T>(element, current);
}
OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, element));
Count++;
}
public T Pop()
{
if (current is null)
{
throw new InvalidOperationException("Stack is empty");
}
T temp = current.Element;
current = current.PreviousElement;
Count--;
OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Remove, temp));
return(temp);
}
public IEnumerator <T> GetEnumerator()
{
StackElement <T> temp = current;
while (true)
{
if (temp is null)
{
yield break;
}
yield return(temp.Element);
temp = temp.PreviousElement;
}
}
public StackElement(T element, StackElement <T> previousElement) : this(element)
{
PreviousElement = previousElement;
}
public void Reverse()
{
current = GetReversedVersion().current;
}