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- // tvfm.h -- Tv and Remote classes using a friend member
- #ifndef TVFM_H_
- #define TVFM_H_
- class Tv; // forward declaration
- class Remote
- {
- public:
- enum State{Off, On};
- enum {MinVal,MaxVal = 20};
- enum {Antenna, Cable};
- enum {TV, DVD};
- private:
- int mode;
- public:
- Remote(int m = TV) : mode(m) {}
- bool volup(Tv & t); // prototype only
- bool voldown(Tv & t);
- void onoff(Tv & t);
- void chanup(Tv & t);
- void chandown(Tv & t);
- void set_mode(Tv & t);
- void set_input(Tv & t);
- void set_chan(Tv & t, int c);
- };
- class Tv
- {
- public:
- friend void Remote::set_chan(Tv & t, int c);
- enum State{Off, On};
- enum {MinVal,MaxVal = 20};
- enum {Antenna, Cable};
- enum {TV, DVD};
- Tv(int s = Off, int mc = 125) : state(s), volume(5),
- maxchannel(mc), channel(2), mode(Cable), input(TV) {}
- void onoff() {state = (state == On)? Off : On;}
- bool ison() const {return state == On;}
- bool volup();
- bool voldown();
- void chanup();
- void chandown();
- void set_mode() {mode = (mode == Antenna)? Cable : Antenna;}
- void set_input() {input = (input == TV)? DVD : TV;}
- void settings() const;
- private:
- int state;
- int volume;
- int maxchannel;
- int channel;
- int mode;
- int input;
- };
- // Remote methods as inline functions
- inline bool Remote::volup(Tv & t) { return t.volup();}
- inline bool Remote::voldown(Tv & t) { return t.voldown();}
- inline void Remote::onoff(Tv & t) { t.onoff(); }
- inline void Remote::chanup(Tv & t) {t.chanup();}
- inline void Remote::chandown(Tv & t) {t.chandown();}
- inline void Remote::set_mode(Tv & t) {t.set_mode();}
- inline void Remote::set_input(Tv & t) {t.set_input();}
- inline void Remote::set_chan(Tv & t, int c) {t.channel = c;}
- #endif
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