Function rosrust::singleton::subscribe_with_ids_and_headers

pub fn subscribe_with_ids_and_headers<T, F, G>(
    topic: &str, 
    queue_size: usize, 
    on_message: F, 
    on_connect: G
) -> Result<Subscriber> where
    T: Message,
    F: Fn(T, &str) + Send + 'static,
    G: Fn(HashMap<String, String>) + Send + 'static,