public void difference_update(SetCollection set)
{
if (object.ReferenceEquals(set, this))
{
_items.Clear();
return;
}
lock (_items) {
_items.DifferenceUpdate(set._items);
}
}
public SetCollection difference([NotNull] params object[] /*!*/ sets)
{
Debug.Assert(sets != null);
if (sets.Length == 0)
{
return(copy());
}
SetStorage res = _items;
foreach (object set in sets)
{
if (ReferenceEquals(set, this))
{
return(Empty);
}
SetStorage items = SetStorage.GetItems(set);
if (ReferenceEquals(res, _items))
{
res = SetStorage.Difference(_items, items);
}
else
{
res.DifferenceUpdate(items);
}
}
Debug.Assert(!ReferenceEquals(res, _items));
return(Make(res));
}
