gistfile1.txt

+ (ZCDataStore *)sharedStore
{
    static ZCDataStore *shared = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        shared = [[super allocWithZone:nil] init];
    });
    return shared;
}


+ (id)allocWithZone:(NSZone *)zone
{
    return [self sharedStore];
}