CueSyncArray *syncArray = [@[@"some", @"items"] cueConcurrent];
CueSyncDictionary *syncDict = [@{ @"key" : @"val" } cueConcurrent];
[self cuePerformBlockInBackground:^{
  [syncArray insertObject:@"more" atIndex:1];
  syncDict[@"key2"] = @"val2";
}];

int i = 0;

// We cannot guarantee safety during normal for-loops, but foreach loops are safe.
for (id obj in syncArray) {
  // Since we copy the array before enumerating, you can even mutate mid-loop!
  syncArray[i++] = @"I've been mutated!";
}

CueTaskQueue *queue = [[CueTaskQueue alloc] initWithName:@"PewPewQueue"];

// relatively low-priority queue.
queue.threadPriority = 0.3; 

// single-thread so you don't have to worry about @synchronizing everything.
[queue startWithThreadCount:1]; 

for (int i = 0; i < 10; ++i) {
  [queue addTask:[CueBlockTask taskWithKey:@(i) priority:1.0f executionBlock:^(CueTask *task) {
    NSLog(@"Task %d reporting for duty!", i);
  }]];
}

// Cleans up and removes the thread.
[queue finish]; 

// This cache object takes a filename as its key, and returns its NSData from disk.
CueLoadingCache *fileLoader = [[CueLoadingCache alloc] initWithLoader:^id(id key) {
  NSArray * paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
  NSString * docPath = [paths[0] stringByAppendingFormat:@"/%@",path];
  return [NSData dataWithContentsOfFile:docPath];
} isMemorySensitive:YES];

// Loads from disk the first time...
NSData *valueFirstTime = fileLoader[@"TextFile1.txt"];
// Loads from cache the second time.
NSData *valueSecondTime = fileLoader[@"TextFile1.txt"];

- (BOOL)safeLockedQuery {
  // Guarantees lock until scope ends.
  CueStackLock(_lock);
  if ([self needsToBreak]) {
    return NO;
  }
  return [self potentialThrowQuery];  
}