Suggestions on how to make an alarmclock-like function

[wysota]

I don't get why you replaced what I had with your line #26. It's suboptimal. The code just had two typos After correcting them it compiles and works fine. Here is the corrected code:

#include <QtGui>
#include <QObject>
 
class AlarmClock : public QObject {
    Q_OBJECT
public:
  AlarmClock(QObject *parent = 0) : QObject(parent), m_timer(0) {}
public slots:
  void start(int ms = 1000) {
    if(m_timer!=0) return;
    m_timer = startTimer(ms); // 1s resolution
  }
  void stop() {
    if(m_timer==0) return;
    killTimer(m_timer);
    m_timer = 0;
  }
  void addAlarm(const QDateTime &dt) {
    QList<QDateTime>::iterator iter = qLowerBound(m_alarms.begin(), m_alarms.end(), dt);
    if(iter==m_alarms.end() || *iter != dt) m_alarms.insert(iter, dt);
  }
signals:
  void alarm(const QDateTime &dt);
protected:
  void timerEvent(QTimerEvent *ev) {
    if(ev->timerId()!=m_timer) { QObject::timerEvent(ev); return; }
    QDateTime current = QDateTime::currentDateTime();
    while(!m_alarms.isEmpty() && m_alarms.first()<=current) {
        emit alarm(m_alarms.first());
        m_alarms.removeFirst();
    }
  }
private:
  QList<QDateTime> m_alarms;
  int m_timer;
};
 
class Dummy : public QObject {
    Q_OBJECT
public slots:
    void onAlarm(const QDateTime &dt) {
	qDebug() << dt;
    }
};
 
#include "main.moc"
 
int main(int argc, char **argv){
    QApplication app(argc, argv);
    AlarmClock alarms;
    Dummy d;
    d.connect(&alarms, SIGNAL(alarm(QDateTime)), &d, SLOT(onAlarm(QDateTime)));
    alarms.addAlarm(QDateTime(QDate::currentDate(), QTime::currentTime().addSecs(2)));
    alarms.addAlarm(QDateTime(QDate::currentDate(), QTime::currentTime().addSecs(6)));
    alarms.addAlarm(QDateTime(QDate::currentDate(), QTime::currentTime().addSecs(14)));
    alarms.addAlarm(QDateTime(QDate::currentDate(), QTime::currentTime().addSecs(10)));
    alarms.start();
    return app.exec();
}

#include <QtGui>
#include <QObject>

class AlarmClock : public QObject {
    Q_OBJECT
public:
  AlarmClock(QObject *parent = 0) : QObject(parent), m_timer(0) {}
public slots:
  void start(int ms = 1000) {
    if(m_timer!=0) return;
    m_timer = startTimer(ms); // 1s resolution
  }
  void stop() {
    if(m_timer==0) return;
    killTimer(m_timer);
    m_timer = 0;
  }
  void addAlarm(const QDateTime &dt) {
    QList<QDateTime>::iterator iter = qLowerBound(m_alarms.begin(), m_alarms.end(), dt);
    if(iter==m_alarms.end() || *iter != dt) m_alarms.insert(iter, dt);
  }
signals:
  void alarm(const QDateTime &dt);
protected:
  void timerEvent(QTimerEvent *ev) {
    if(ev->timerId()!=m_timer) { QObject::timerEvent(ev); return; }
    QDateTime current = QDateTime::currentDateTime();
    while(!m_alarms.isEmpty() && m_alarms.first()<=current) {
        emit alarm(m_alarms.first());
        m_alarms.removeFirst();
    }
  }
private:
  QList<QDateTime> m_alarms;
  int m_timer;
};

class Dummy : public QObject {
    Q_OBJECT
public slots:
    void onAlarm(const QDateTime &dt) {
	qDebug() << dt;
    }
};

#include "main.moc"

int main(int argc, char **argv){
    QApplication app(argc, argv);
    AlarmClock alarms;
    Dummy d;
    d.connect(&alarms, SIGNAL(alarm(QDateTime)), &d, SLOT(onAlarm(QDateTime)));
    alarms.addAlarm(QDateTime(QDate::currentDate(), QTime::currentTime().addSecs(2)));
    alarms.addAlarm(QDateTime(QDate::currentDate(), QTime::currentTime().addSecs(6)));
    alarms.addAlarm(QDateTime(QDate::currentDate(), QTime::currentTime().addSecs(14)));
    alarms.addAlarm(QDateTime(QDate::currentDate(), QTime::currentTime().addSecs(10)));
    alarms.start();
    return app.exec();
}

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