Normally when I want to explicitly delay a signal, I use QMetaObject::invokeMethod(), which at least allows for argument handling. I used QTimer::singleShot() in the code above because I thought it would be more familiar to readers and I could get away with it (since quit() has no args).

Good tip about the loopback connection, though. I’d forgotten about that one. It allows for safer argument handling than invokeMethod.

and then in the constructor do a:
connect(this, SIGNAL(quit()), this, SIGNAL(quit()), Qt::QueuedConnection);

which should emit the signal quit() as soon as control reaches the event loop after an emit quit_p(). nice thing is you can still use the normal emit syntax which helps with parameters.