Question

I’m working on a GameKitHelper class, and it’s mostly written in C++, but with Objective-C in some places as well, inside an .mm file.

I removed a bit of functionality to isolate the error:

void GameKitHelper::PopulateFriendScores(DynArray<GameCenterScore> *FriendScores)
{
    GKLeaderboard *leaderboardRequest = [[GKLeaderboard alloc] init];
    if (leaderboardRequest != nil)
    {
        leaderboardRequest.playerScope = GKLeaderboardPlayerScopeFriendsOnly;
        leaderboardRequest.timeScope = GKLeaderboardTimeScopeAllTime;
        leaderboardRequest.range = NSMakeRange(1,25);

        [leaderboardRequest loadScoresWithCompletionHandler: ^(NSArray *scores, NSError *error) 
         {
             int i = 0;
             printf("%d", i);
         }];
    }
}

The error I get here is:

'int GameKitHelper::i' is not a static member of 'class GameKitHelper'

Answer 1

This is a gcc bug. See Objective-C++ block vs Objective-C block for one of many reports of it.

<soapbox>I recommend avoiding Objective-C++ as much as possible. It’s slow to compile, bloated to run (particularly with ARC since it turns on -fobjc-arc-exceptions), buggy in the compiler and the debugger, and mostly a mess in my experience giving the worst of both worlds. C++ is fine. Objective-C is fine. Just keep the interface between them as small as possible. </soapbox>

But switching to clang 2.0 might fix this specific problem.