namespace Foundation
{
    [DefaultMember("Item")]
    [Register("NSMutableOrderedSet", SkipRegistration = true)]
    public sealed class NSMutableOrderedSet<TKey> : NSMutableOrderedSet, IEnumerable, IEnumerable<TKey>
        where TKey, class, INativeObject
    {
        public static NSMutableOrderedSet<TKey> operator +(NSMutableOrderedSet<TKey> first, NSSet<TKey> second);
    }
}