Article:		Strings in Cocoa: Part I
Subject:		Comparing @"..." type NSStrings
Date:		2001-07-06 17:02:13
From:		mikebeam
Response to: Comparing @"..." type NSStrings
Is that right? Wow, i didn't realize that. Thanks for pointing that out. I guess it makes perfect sense. By the way, what are some of the features of Cocoa that rely on this fact as you mentioned? Mike

Showing messages 1 through 2 of 2.

• Comparing @"..." type NSStrings
  2001-07-07 01:18:41  halliday [View]
  
  
  Additionally, unless I'm misremembering, SELectors are implemented as unique @"..." type NSString constants as well.

• Comparing @"..." type NSStrings
  2001-07-07 00:47:41  halliday [View]
  
  
  As the NSString documentation indicates (in it's Objective-C version): "The compiler makes such object constants unique on a per-module basis".
  
  Some of the features that rely upon this behavior are Pasteboard Types (they are really @"..." type NSStrings), various Attribute Keys, Exceptions, and Notifications (to name a few). Of course, this is an implementation detail, and is always subject to change.