How to close all windows that were created in main()?

[Mister_Crac]

EDIT: Btw, make sure you allocate widgets on stack if you set Qt::WA_DeleteOnClose attribute! Otherwise you'll get a crash due to double delete...

On the stack? I thought this allocates an object on the heap:

Object *example = new Object;

Object *example = new Object;

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Anyways it works like you suggested, thank you!