On 21 May '08, at 12:14 PM, Vijay Malhan wrote:
If I'm not wrong "self" equivalent of "this" which points to an instance var. And it is initialized in - init (instance)method. And if it fails to initialize, it's nil. So does "self" even exist when + initialize is called.
This is a class method, so "self" refers to the class itself.Objective-C is a more pervasively object-oriented language than C++ or Java, and classes are objects in their own right. Class methods (the ones with the "+") are methods defined on the class itself.
For gory details, look up "metaclass" on Wikipedia. The concept goes back to at least Smalltalk-76. (Fortunately it's not as mind-bendingly recursive in Obj-C as in Smalltalk, where there is a class "Metaclass", and the inheritance hierarchy goes into loops!)
—Jens
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