In this sort of well-known code pattern for making a singleton with GCD:
+ (MyClass *) sharedInstance {
static MyClass *sharedInstance = nil;
static dispatch_once_t onceToken = 0;
dispatch_once (&onceToken, ^{
sharedInstance = [MyClass new];
});
return sharedInstance;
}
Why is the block permitted to assign to the variable sharedInstance outside the
block? Evidently it is because "static" has an effect like "__block", in that
it makes the variable outside the block assignable. But how, exactly? Is it
some kind of side effect of being a local static? Thx - m.
--
matt neuburg, phd = m...@tidbits.com, <http://www.apeth.net/matt/>
A fool + a tool + an autorelease pool = cool!
Programming iOS 6! http://shop.oreilly.com/product/0636920029717.do
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