@autoreleasepool without ARC?
I'm new to Xcode 4.2, and I'm not yet fully up to speed on ARC. However, I did read that @autoreleasepool replaces the manual use of autorelease pools and does some special magic under the hood to play nice with ARC.
Yet, when I start a new project in Xcode 4.2 specifically with the ARC option turned off I still get @autoreleasepool statements in the template code.
What's the deal here?
Solution 1:
From http://clang.llvm.org/docs/AutomaticReferenceCounting.html#autoreleasepool:
@autoreleasepool
may be used in non-ARC translation units, with equivalent semantics.
and Greg Parker says [1] [2]:
LLVM 3.0's
@autoreleasepool { ... }
is much faster than NSAutoreleasePool if your deployment target is new enough. No ARC required. (…) always works, but it's faster with deployment target of OS X 10.7 or iOS 5.0.
So you may use @autoreleasepool
regardless of ARC, and it’ll be faster than NSAutoreleasePool
on OS X v10.7+ and iOS 5.0+.