How do I prove ARC is working?

Question

I have a non-ARC project that I added a new file to and set an ARC compiler flag (-fobjc-arc) for. When I make calls to [object release]; in the file, there are no compiler errors thrown. I need to be sure that this file indeed has ARC enabled, how can I prove that? Thanks.

Possible duplicate of: http://stackoverflow.com/questions/9462372/how-do-i-know-whether-the-compiler-has-arc-support-enabled — Attila H, Jan 17 '13 at 15:12

score 6 · Accepted Answer · edited Jan 17 '13 at 15:14

6

There is no check for ARC at runtime. However, you can check it at compile time:

#if !__has_feature(objc_arc)
    //Do the old stuff
#endif

Hope that helps.

edited Jan 17 '13 at 15:14

zoul

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answered Jan 17 '13 at 15:11

Boris Prohaska

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Exactly what I was looking for. I set the compiler flag on the wrong target BTW... that was the problem... – HackyStack Jan 17 '13 at 16:00

score 1 · Answer 2 · answered Jan 17 '13 at 15:14

1

Additionally, if you can call -release, ARC is off. Once turned on, the compiler will complain about any attempt at manual memory management, like calling -retain, -release or [super dealloc].

answered Jan 17 '13 at 15:14

zoul

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score 0 · Answer 3 · answered Jan 17 '13 at 15:12

0

Try this

#if __has_feature(objc_arc)
    // ARC is On
    NSLog(@"ARC on");

#else
    // ARC is Off
    NSLog(@"ARC off");

#endif

Hope it helps you..

answered Jan 17 '13 at 15:12

P.J

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How do I prove ARC is working?

3 Answers3