Automatic Reference Counting: ????????? memory ????????? XCode 4

?????????? Objective-C ??? manual reference counting ????? code ?????????? XCode 4 ??????????????????? memory ??????? ???????????????????????? style ????????? ?????????? Garbage Collector ??????????????? Ref count ! XCode ??? keyword ??????????? ???????? object ownership ?????? compilter ???????? alloc/dealloc ????????????????????????????????? compiler ???????? link ????????????? compiler ????????? inject alloc/dealloc code ??????????????????? flow

??????????????? trade-off ?????????????? ????????/????? ???????????????????? ???????????????????????? compiler ??? ????????????????????? keyword ???? ????????? @property ?????? strong ??? weak

strong = retain, ??????? strong reference

weak = assign, ??????? weak reference

???????????? ????? Strong reference cycle ??????????? (?????? ???????? static analyzer ?????????????? :D)

ARC ????????? code ?????? memory ??????? ????????????? ???????????????? interop ??? code ???? (???????????? ???? dev doc ??? :p) ??? point ??????????????????????? id ?????????????????? (void *) ????