Question

class Printer;
enum Printer::States;
class Printer {                  // choose one of monitor or cormonitor
    States taskStates[];
  public:
    enum States { Starting = 'S', Blocked = 'B', Unblocked = 'U', Finished = 'F', // general
          Napping = 'N', Awake = 'A',             // Santa
          Working = 'W', NeedHelp = 'H',          // elf
          OnVacation = 'V', CheckingIn = 'I',     // reindeer
          DeliveringToys = 'D', DoneDelivering = 'd', // Santa, reindeer
          Consulting = 'C', DoneConsulting = 'c' // Santa, elves
    };
    Printer();
    void print( unsigned int id, States state );
    void print( unsigned int id, States state, unsigned int numBlocked );
};

Answer 1

You can’t declare nested enums outside of the class. You also have to have it be defined before you use it.

class Printer {                  // choose one of monitor or cormonitor
  public:
    enum States { Starting = 'S', Blocked = 'B', Unblocked = 'U', Finished = 'F', // general
      Napping = 'N', Awake = 'A',             // Santa
      Working = 'W', NeedHelp = 'H',          // elf
      OnVacation = 'V', CheckingIn = 'I',     // reindeer
      DeliveringToys = 'D', DoneDelivering = 'd', // Santa, reindeer
      Consulting = 'C', DoneConsulting = 'c' // Santa, elves
    };
  private:
    States taskStates[];
  public:
    Printer();
    void print( unsigned int id, States state );
    void print( unsigned int id, States state, unsigned int numBlocked );
};

As a side-note, C++11’s enum class only has to be declared inside the class – it can be defined outside of it.