private IEnumerable <T> CreateEnumerator(LinkedListNode <T> start, IteratorDirection direction)
{
// Note: start и direction запоминаются в виде открытых полей итератора,
// Note: созданного в yield-блоке
LinkedListNode <T> current = null;
do
{
if (current == null)
{
current = start;
}
else
{
current = direction == IteratorDirection.Forward ? current.Next : current.Previous;
}
if (current != null)
{
yield return(current.Value);
}
}while (current != null);
}
public BidirectionalIterator(LinkedListNode <T> start, IteratorDirection direction)
{
_enumerator = CreateEnumerator(start, direction).GetEnumerator();
_enumType = _enumerator.GetType();
}
