I'm trying to learn and use Blocks effectively. On the web, I've come across this tasty morsel of code:
long long (^blockFun)() = (long long (^)())moreBlockFun;
it confuses the heck out of me. I think it's trying to create a block that expects a block that returns a long and i think it's doing some casting somewhere too, just for fun.
can someone explain this to me?
It's a block type cast and yes, the syntax isn't great. We assume that moreBlockFun is a block that takes no parameters, and returns something with a sensible cast to long long - this type signature is written long long (^)(). So we create a new local name for that block called blockFun, with the syntax long long (^blockFun)(), and perform the cast.
It's a mess mostly inherited from function pointer type notation, which virtually every C programmer has to lookup around 482 times before they remember it. You're not alone!