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by mpweiher
4290 days ago
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> 1. You can't just change the implementation of the string type without messing up someone's program. Yeah, you can. 'NSString' is in fact a class cluster that provides different implementations/representations. Well, used to be on OS X, because it was changed to be a wrapper for a single CoreFoundation representation. In GNUstep and Cocotron, I think they still use the older class-cluster implementation, and programs are portable between these implementations. Polymorphism, baby :-) |
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