/// <summary>
/// Advances passed iterator 'index' positions forward
/// </summary>
public static SparsedListIterator <T> Advance <T>(SparsedListIterator <T> iterator, int index) where T : class
{
int skipped = 0;
while (true)
{
if (skipped == index)
{
break;
}
skipped++;
if (!iterator.Next())
{
break;
}
}
return(iterator);
}
/// <summary>
/// Finds an N-th non-null item, where N is passed in 'index' argument
/// </summary>
public static SparsedListIterator <T> FindNth <T>(SparsedListIterator <T> iterator, int index) where T : class
{
int skipped = 0;
while (true)
{
if (iterator.LineNumber.HasValue)
{
if (skipped == index)
{
break;
}
skipped++;
}
if (!iterator.Next())
{
break;
}
}
return(iterator);
}