private static void Skip(ref LinkedListContext <T> context, out Option <T> next)
{
context.bd.DetectBacktrack();
if (context.needsMove)
{
var step = context.step;
while (step > 0 && context.node != null)
{
context.node = context.node.Next;
--step;
}
while (step < 0 && context.node != null)
{
context.node = context.node.Previous;
++step;
}
}
else
{
context.needsMove = true;
}
if (context.node == null)
{
next = new Option <T>();
context.bd.Release();
}
else
{
next = new Option <T>(context.node.Value);
}
}
private static void Remove(ref LinkedListContext <T> context, out Option <T> next)
{
context.bd.DetectBacktrack();
if (context.step == 0)
{
next = new Option <T>();
context.node.List.Remove(context.node);
context.bd.Release();
}
else
{
var node = context.node;
Skip(ref context, out next);
node.List.Remove(node);
}
}
private static void DisposeNodes(ref LinkedListContext <T> context, out Option <LinkedListNode <T> > next)
{
next = new Option <LinkedListNode <T> >();
context.bd.Release();
}