How to quit my application from any point of any class

[tonnot]

I can't get to terminate my application from a class that is at a deep level.
(In example class A, creates B, this creates D, and this last has a for loop in which class E is used ).
qApp.quit(); does nothing. (neither other options)
Any help ?

[Zlatomir]

By connecting one quit_signal to the qApp's quit slot.

LE: You need: #include <QApplication> into the .cpp where you want to use the qApp macro.