Dispatch+Extension.swift

public extension dispatch_queue_t {
    final func async(block: dispatch_block_t) {
        dispatch_async(self, block)
    }
    final func async(group: dispatch_group_t, _ block: dispatch_block_t) {
        dispatch_group_async(group, self, block)
    }
    final func sync(block: dispatch_block_t) {
        dispatch_sync(self, block)
    }
}
// Usage like dispatch_get_main_queue().async { /* do stuff async */ }