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wookiee/gist:4430204

Created January 1, 2013 21:35
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singleton shared instance creation with dispatch_once()
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gistfile1.txt
+ (id)sharedInstance
{
static dispatch_once_t onceQueue;
static <#Type#> *instance = nil;
dispatch_once(&onceQueue, ^{ instance = [[self alloc] init]; });
return instance;
}
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