public bool MoveNext()
{
do
{
if (version != list.version)
{
throw new InvalidOperationException("Collection modified");
}
if (index > 0 &&
Current != null // only works for values that are set, otherwise the index is buried in the free index stack somewhere
)
{
int freeIndex = list.freeIndices.Peek();
if (freeIndex < index)
{
list.freeIndices.Pop();
list[freeIndex] = list[index];
list.RemoveAt(index);
}
}
index++;
return(index < list.Count);
} while (Current == null);
}
/// <summary>
/// Accessing Current after RemoveCurrent may throw a NullReferenceException or return null.
/// </summary>
public void RemoveCurrent()
{
list.RemoveAt(index);
}