I have attached a zip file containing a modified project of simple-cpp example. I have added two classes for consecutive ray casting. I have some unexpected observations. 

At main.cpp file, when I run this line, at some point, ray-caster won't disable itself, therefore consecutive ray-casting gets stuck:

ConsecutiveRayCaster *consecutiveRayCaster = new ConsecutiveRayCaster(scene, TimeDelayStatus::NoDelay);

However, when I run this line, even when delay value is equal to 0 msec, all ray-casts tests are done consecutively without any issue:

ConsecutiveRayCaster *consecutiveRayCaster = new ConsecutiveRayCaster(scene, TimeDelayStatus::SomeDelay, 0 /* msec */);

This switch makes the difference:

switch (m_timeDelayStatus) {
case NoDelay:
    rayCaster->trigger(origin, direction, length);
    break;
case SomeDelay:
    QTimer::singleShot(m_timeDelayBetweenRayCasts, [rayCaster, origin, direction, length](){ rayCaster->trigger(origin, direction, length); });
    break;
}
 

I'm not sure whether the attached project is supposed to behave like this.