Have you ever been hurt by the existence of nepotism? Yes? Have you even been bleeding on a hospital's floor while some deputy's children are getting everything without waiting in lines?
Congratulations! Now you can feel yourself God with our new concept of queue: nepotism-queue. Now, only you can decide if an instance is important enough to make everybody wait.
void push(const T& val) -- adds an instance to the end of your queue.
void push_nep(const T& val) -- adds an instance after between important instances and non-important instances in your queue.
pop / front always take instances from the important ones if there are any.