feasible to not declare ivar but use in synthesize?

Question

I\'m looking at some sample code and I\'m puzzled over the lack of declaration of a specific ivar. Hoping someone can help me understand this better:

typedef NSU         


        

Answer 1

It's part of the modern runtime, and cuts down on the duplication of code - declaring iVars and then declaring properties for those iVars.

It's handled for you by the @synthesize

The modern runtime lets you do other things that you thought you couldn't do before. For example, you can now declare iVars in the .m file as part of a class extension, which reduces the amount of information you expose in your public interface.

Update

The modern LLVM 4 compiler even lets you do away with the @sytnthesize line. If you declare a property it will auto-synthesize for you and it will even create a backing store with a leading underscore.