Nested blocks discussion

nestedBlocks.m

void RetrieveFriends(GameCenter& gameCenter, GKLocalPlayer* localPlayer)
{
	[localPlayer loadFriendsWithCompletionHandler:^(NSArray* friends, NSError* error) 
	{
		[GKPlayer loadPlayersForIdentifiers:friends withCompletionHandler:^(NSArray* players, NSError* error2) 
		{
			dispatch_async(dispatch_get_main_queue(), ^(void)
			{ 
				TestLala(gameCenter); //, friends, players, error2); 
			});
		}];
	}];
}