int main()
{
    // services start asynchronously when instantiated, or if necessary,
    // via a call to a start() method
    BackgroundService servA;

    // the main application code can send messages (for example, strings),
// to the service, which it asynchronously processes
    servA.processMessage("foo");

    // when the service object goes out of scope, the background service
    // terminates. Depending on desired behavior, we may want the main
    // app to wait on the termination
    return 0;
}