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Here Understand Objective-C runtime is my question about how objective-c runtime work.
What I still can’t understand is does the allocated memory for Person instance contain only isa pointer to class or something else ?
There is a great paper if you want to know the layout of Objective-C objects here (pdf warning), but in short, the memory for every object contains an isa pointer and space for all its iVars, including inherited ones from its superclasses.