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