porterskyandQwen 3.8 27B
6e0e45110a
Refactor the Pelican crossing exercise to use the Observer pattern: Pelican acts as Subject and each Pole observes it, replacing direct calls through the owned Pole pointer. Co-authored-by: Qwen 3.8 27B <qwen3.8_27b-q3_k_xl@lmstudio.local>
54 lines
1.3 KiB
C++
54 lines
1.3 KiB
C++
// ======================================================
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//
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// Represents a Pelican crossing
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//
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// ======================================================
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#ifndef PELICAN_H
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#define PELICAN_H
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#include "Subject.h"
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class PelicanTimer;
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class Pole;
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class Pelican : public Subject {
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public:
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Pelican();
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~Pelican();
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// call when the WAIT button has been pressed
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void press(void);
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// states that a Pelican can be in
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enum PelicanState { RED_STATE, YELLOW_FLASHING, GREEN_TIMING, GREEN_IDLE, YELLOW_STATE };
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bool isPressed() const { return pressed; }
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PelicanState getState() const { return state; }
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private:
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// state that this Pelican is in
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PelicanState state;
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// called by PeleicanTimer when the lights need to change
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void timerExpired(void);
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const unsigned int RED_TIME;
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const unsigned int YELLOW_TIME;
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const unsigned int GREEN_TIME;
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const unsigned int FLASH_TIME;
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// indicates whether the WAIT light should be on
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bool pressed;
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// Timer that indicates when the lights should change
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PelicanTimer *myTimer;
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private:
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// prevent general use of copy ctor and operator=
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Pelican(const Pelican &);
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Pelican &operator=(const Pelican &);
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};
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#endif
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