Skip to content

Instantly share code, notes, and snippets.

@danielctull

danielctull/dct_weak.h

Created November 9, 2011 12:28
Show Gist options
  • Save danielctull/1351298 to your computer and use it in GitHub Desktop.
Save danielctull/1351298 to your computer and use it in GitHub Desktop.
Download ZIP
ARC macros for weak references
Raw
dct_weak.h
#import <Availability.h>
#if __IPHONE_OS_VERSION_MIN_REQUIRED < __IPHONE_4_3
#warning "This library uses ARC which is only available in iOS SDK 4.3 and later."
#endif
#if !defined dct_weak && __IPHONE_OS_VERSION_MIN_REQUIRED >= __IPHONE_5_0
#define dct_weak weak
#define __dct_weak __weak
#define dct_nil(x)
#elif !defined dct_weak && __IPHONE_OS_VERSION_MIN_REQUIRED >= __IPHONE_4_3
#define dct_weak unsafe_unretained
#define __dct_weak __unsafe_unretained
#define dct_nil(x) x = nil
#endif
@Abizern
Copy link

Abizern commented Nov 10, 2011

The trouble with these macros is that once dct_weak is defined control drops through to the final #else and the compiler starts emitting the warning. I've corrected it with https://gist.github.com/1354106 which explicitly emits a warning if the minimum iOS requirement is not met.

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment