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Weak Singleton
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| + (id)sharedInstance | |
| { | |
| static __weak ASingletonClass *instance; | |
| ASingletonClass *strongInstance = instance; | |
| @synchronized(self) { | |
| if (strongInstance == nil) { | |
| strongInstance = [[[self class] alloc] init]; | |
| instance = strongInstance; | |
| } | |
| } | |
| return strongInstance; | |
| } |
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