How do I know if my program has ARC enabled or not?

Question

I create a project with ARC support using the Xcode project wizard. Compared with a program without ARC support, I did not notice any differences. Is there any hint that can tel

Answer 1

You can use __has_feature, maybe logging whether the project has ARC in the console like this:

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

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

#endif

Alternatively, instead of just logging whether ARC is on, try making the compiler raise an error if ARC is on (or off) like this:

#if  ! __has_feature(objc_arc)
    #error This file must be compiled with ARC. Use -fobjc-arc flag (or convert project to ARC).
#endif