Is there any way to traverse amount of controls in a loop?

[franz]

Or if you want to run through all those items unconditionally:

foreach (QComboBox *box, findChildren<QComboBox *>()) {
    // do the fancy stuff
}

foreach (QComboBox *box, findChildren<QComboBox *>()) {
    // do the fancy stuff
}

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Note that QObject::findChlidren() might recurse into other child widgets to find children that match the type T & name.