title: Does the iOS SDK provide queues and stacks?
body: <p>I'm writing an iPhone app, and I'm surprised that there seem to be no NSQueue or NSStack classes in Apple's <a href="http://developer.apple.com/iphone/library/documentation/Cocoa/Reference/Foundation/ObjC_classic/index.html#//apple_ref/doc/uid/20001091" rel="noreferrer">Foundation Framework</a>.  I see that it would be quite easy to roll my own, starting with an <a href="http://developer.apple.com/iphone/library/documentation/Cocoa/Reference/Foundation/Classes/NSMutableArray_Class/Reference/Reference.html" rel="noreferrer">NSMutableArray</a>, so I'll do that unless I've missed something.  Have I missed something?</p>