How do I use Gtk::ListBox::SlotForeach?

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Hi I’m using gtkmm 4 and I would like to use Gtk::ListBox::SlotForeach to iterate over all rows in a Gtk::ListBox. Looking at the API: gtkmm: Gtk::ListBox Class Reference has left me baffled.
I defined in my class the following method:
void on_foreach(Gtk::ListBoxRow* row);
What signal do I need to connect it to?

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