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>
61 lines
1.3 KiB
C++
61 lines
1.3 KiB
C++
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#include "Pelican.h"
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#include "PelicanTimer.h"
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#include "Pole.h"
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Pelican::Pelican()
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: pressed(false), RED_TIME(4), YELLOW_TIME(2), GREEN_TIME(3), FLASH_TIME(5),
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state(GREEN_IDLE) {
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myTimer = new PelicanTimer(*this, &Pelican::timerExpired);
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notify();
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}
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Pelican::~Pelican() { }
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void Pelican::press(void) {
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if (state == GREEN_IDLE) {
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state = YELLOW_STATE;
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myTimer->timeoutRequest(YELLOW_TIME);
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pressed = true;
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} else if (state != RED_STATE) {
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pressed = true;
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}
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notify();
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}
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void Pelican::timerExpired(void) {
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switch (state) {
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case RED_STATE:
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state = YELLOW_FLASHING;
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myTimer->timeoutRequest(FLASH_TIME);
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break;
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case YELLOW_FLASHING:
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state = GREEN_TIMING;
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myTimer->timeoutRequest(GREEN_TIME);
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break;
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case GREEN_TIMING:
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if (pressed) {
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state = YELLOW_STATE;
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myTimer->timeoutRequest(YELLOW_TIME);
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} else {
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state = GREEN_IDLE;
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}
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break;
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case GREEN_IDLE:
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// should never happen
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break;
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case YELLOW_STATE:
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state = RED_STATE;
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pressed = false;
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myTimer->timeoutRequest(RED_TIME);
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break;
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}
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notify();
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}
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