public void difference_update([NotNull] params object[] /*!*/ sets)
{
if (sets.Length == 0)
{
return;
}
lock (_items) {
foreach (object set in sets)
{
if (object.ReferenceEquals(set, this))
{
_items.ClearNoLock();
return;
}
_items.DifferenceUpdate(SetStorage.GetItems(set));
}
}
}
