title: NSOrderedSet for iPhone?
body: <p>For some odd reason NSOrderedSet does not appear to be implemented in iOS.  Is there another object that gives similar functionality -- basically the ability to insert/remove objects randomly and access the first/last in sort order?</p>
  
  <p>It seems to me that something like this would be needed in order to implement basic FIFO queues and the like.</p>
  
  <p><strong>Edit:</strong> I ended up doing an RYO solution.</p>