[boost] [signals]: Making copies of a slot

AFICT, the rationale for copying a slot is missing, hence the following questions... boost::signal<void (int)> some_signal; Some_Slot slot1; some_signal.connect(slot1); Some_Slot slot2(slot1); some_signal(42); The above code will only signal slot1. If slot2 is a copy of slot1, should it also get the signal? I know it does not work that way, but I was wondering why that decision was made. Also, if I *do* want the copy to receive the same signals, how can I do so? Thanks!