public Record(OrderKeeper <T> keeper, T item, ulong label, Record <T> previous, Record <T> next)
{
Keeper = keeper;
Item = item;
Label = label;
Previous = previous ?? keeper.First;
Next = next ?? keeper.First;
}
public Record(OrderKeeper <T> keeper, T item, ulong label)
{
Keeper = keeper;
Item = item;
Label = label;
Previous = this;
Next = this;
}