#if __has_feature(objc_arc)
#define DH_AUTORELEASE(exp)
#define DH_RELEASE(exp)
#define DH_RETAIN(exp)
#else
#define DH_AUTORELEASE(exp) [exp autorelease]
#define DH_RELEASE(exp) [exp release]
#define DH_RETAIN(exp) [exp retain]
#endif纯粹是当做了备忘录那～～嘿嘿
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