// .h
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#define singleton_interface(class) + (instancetype)shared##class;
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// .m
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#define singleton_implementation(class) \
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static class *_instance; \
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\
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+ (id)allocWithZone:(struct _NSZone *)zone \
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{ \
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static dispatch_once_t onceToken; \
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dispatch_once(&onceToken, ^{ \
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_instance = [super allocWithZone:zone]; \
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}); \
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\
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return _instance; \
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} \
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\
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+ (instancetype)shared##class \
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{ \
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if (_instance == nil) { \
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_instance = [[class alloc] init]; \
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} \
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\
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return _instance; \
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}
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