public static NSSet <TKey> operator -(NSSet <TKey> first, NSSet <TKey> second)
{
if (first == null || first.Count == 0)
{
return(null);
}
if (second == null || second.Count == 0)
{
return(new NSSet <TKey> (first));
}
var copy = new NSMutableSet <TKey> (first);
copy.MinusSet(second);
return(new NSSet <TKey> (copy));
}
public static NSSet operator -(NSSet first, NSOrderedSet second)
{
if (first == null)
{
return(null);
}
if (second == null)
{
return(new NSSet(first));
}
var copy = new NSMutableSet(first);
copy.MinusSet(second.AsSet());
return(copy);
}
