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Macro for creating your "shared instance" using GCD
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| @implementation MySharedThing | |
| + (id)sharedInstance | |
| { | |
| DEFINE_SHARED_INSTANCE_USING_BLOCK(^{ | |
| return [[self alloc] init]; | |
| }); | |
| } | |
| @end |
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| #define DEFINE_SHARED_INSTANCE_USING_BLOCK(block) \ | |
| static dispatch_once_t pred = 0; \ | |
| __strong static id _sharedObject = nil; \ | |
| dispatch_once(&pred, ^{ \ | |
| _sharedObject = block(); \ | |
| }); \ | |
| return _sharedObject; \ |
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