ARC Helper Macros

gistfile1.m

#ifndef SG_RETAIN
#if __has_feature(objc_arc)
#define SG_RETAIN(x) x
#define SG_RELEASE(x)
#define SG_AUTORELEASE(x) x
#define SG_SUPER_DEALLOC
#else
#define __SG_WEAK
#define SG_WEAK assign
#define SG_RETAIN(x) [x retain]
#define SG_RELEASE(x) [x release]
#define SG_AUTORELEASE(x) [x autorelease]
#define SG_SUPER_DEALLOC [super dealloc]
#endif
#endif