RELEASE_SAFELY
或RELEASE_CF_SAFELY
是什么意思?它们用于释放对象,但为什么不使用[obj release]
?此外,我尝试在Xcode 4中使用它,但遇到构建错误:
Undefined symbols for architecture i386:
"_RELEASE_SAFELY", referenced from:
-[AdressBookModel search:] in AdressBookModel.o
ld: symbol(s) not found for architecture i386
collect2: ld returned 1 exit status
我可以仅使用[obj release]
吗?你认为怎样?