QLayout - Delete all items recursively

void clearLayoutWidgets(QLayout* layout) // Not delete the layout itself!
{
    if ((layout == nullptr) || (layout->isEmpty()))
        return;

    // !Note: QLayout inherits QLayoutItem
    QLayoutItem *item;
    while(item = layout->takeAt(0)) {
        // If item has sub-layouts:
        if (item->layout()) {
            clearLayoutWidgets(item->layout()); // Not delete the layout itself!
            delete item->layout(); // Delete outside if need!
        }
        // If item is a widget itself:
        else if (item->widget()) {
            delete item->widget();
            //OR layout->removeWidget(item->widget()) // item was already taken out of layout
        }
        // If item is just a pure empty layout:
        else {
            // bool test = item->isEmpty();
        }

        // In any case: delete item itself!
        delete item;
    }
}