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feat(cmat): implement Ex41 observer pattern

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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>
This commit is contained in:
portersky
2026-10-06 16:26:53 +02:00
co-authored by Qwen 3.8 27B
parent c681ebab2b
commit 6e0e45110a
8 changed files with 39 additions and 28 deletions
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cmat/Ex41/Pelican.cpp
+6 -11
View File
@@ -3,29 +3,25 @@
#include "PelicanTimer.h"
#include "Pole.h"
Pelican::Pelican(int x, int y)
: pressed(false), RED_TIME(4), YELLOW_TIME(2), GREEN_TIME(3), FLASH_TIME(5), myPole(new Pole(x, y)),
Pelican::Pelican()
: pressed(false), RED_TIME(4), YELLOW_TIME(2), GREEN_TIME(3), FLASH_TIME(5),
state(GREEN_IDLE) {
myTimer = new PelicanTimer(*this, &Pelican::timerExpired);
myPole->setTrafficLights(getState());
myPole->setWaitLight(isPressed());
notify();
}
Pelican::~Pelican() { delete myPole; }
Pelican::~Pelican() { }
void Pelican::press(void) {
if (state == GREEN_IDLE) {
state = YELLOW_STATE;
myTimer->timeoutRequest(YELLOW_TIME);
pressed = true;
myPole->setTrafficLights(getState());
myPole->setWaitLight(isPressed());
} else if (state != RED_STATE) {
pressed = true;
myPole->setTrafficLights(getState());
myPole->setWaitLight(isPressed());
}
notify();
}
void Pelican::timerExpired(void) {
@@ -60,6 +56,5 @@ void Pelican::timerExpired(void) {
break;
}
myPole->setTrafficLights(getState());
myPole->setWaitLight(isPressed());
notify();
}