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Possible Duplicate:
What does this ^ syntax mean in Objective-C?
I found the declaration of function addOperationWithBlock as following:
- (void)addOperationWithBlock:(void (^)(void))block NS_AVAILABLE(10_6, 4_0);
So, what does (void (^)(void))block mean?
It declares a method named “-addOperationWithBlock:”, which takes one parameter, which is a pointer to a block that has no parameters and returns nothing.
The NS_AVAILABLE macro tells the compiler that this method is only available in Mac OS 10.6 or later, or iOS 4.0 or later.