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NSObject
@interface NSObject <NSObject> {
Class isa OBJC_ISA_AVAILABILITY;
}
typedef struct objc_class *Class;
struct objc_class {
Class isa OBJC_ISA_AVAILABILITY;
#if !__OBJC2__
Class super_class OBJC2_UNAVAILABLE;
const char *name OBJC2_UNAVAILABLE;
long version OBJC2_UNAVAILABLE;
long info OBJC2_UNAVAILABLE;
long instance_size OBJC2_UNAVAILABLE;
struct objc_ivar_list *ivars OBJC2_UNAVAILABLE;
struct objc_method_list **methodLists OBJC2_UNAVAILABLE;
struct objc_cache *cache OBJC2_UNAVAILABLE;
struct objc_protocol_list *protocols OBJC2_UNAVAILABLE;
#endif
}
id
/usr/include/objc/objc.h.
typedef struct objc_object {
Class isa;
} *id;
全是结构体～
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原文地址：http://www.cnblogs.com/wangda/p/4581346.html
