Easy example of Grand Central Dispatch

Question

I\'m newbie programming for mac and i\'m really surprised on Grand Central Dispatch. I read about that and looks like the perfect solution for parallel programming. I worked wit

Answer 1

Just wrap the code that needs to run asynchronously in a block passed to dispatch_async():

int main(int argc, char* argv[])
{
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0),
    ^ {
        // This code runs asynchronously!
        for (unsigned long long i = 0ULL; i < 100000000000ULL; i++) {
           cout << i << endl;
        }
    });

    return 0;
}

Note that in both this example and yours, the app will actually return immediately since you do nothing to defer the return from main().