porterskyandQwen 3.8 27B
a65e84e796
Extend the Ex42 observer pattern with Hint objects so each observer receives the reason for the update instead of querying the subject: - Subject::notify() and Observer::update() now take a const Hint& argument. - Add LightHint and WaitHint carrying the traffic light state and WAIT button state, defined in Pelican.h. - Pole dispatches on hint type using dynamic_cast. - The Pole constructor sets its initial lights directly from the Pelican's current state, since no notification is sent at startup. Stopgap until the initial update is handled properly. Co-authored-by: Qwen 3.8 27B <qwen3.8_27b-q3_k_xl@lmstudio.local>
26 lines
314 B
C++
26 lines
314 B
C++
|
|
|
|
#ifndef SUBJECT_H
|
|
#define SUBJECT_H
|
|
|
|
class Observer;
|
|
|
|
#include <set>
|
|
|
|
class Hint {
|
|
public:
|
|
virtual ~Hint() = default;
|
|
};
|
|
|
|
class Subject {
|
|
public:
|
|
typedef std::set<Observer *> ObsList;
|
|
void attach(Observer &obs);
|
|
void notify(const Hint&) const;
|
|
|
|
private:
|
|
ObsList myObservers;
|
|
};
|
|
|
|
#endif
|