On Sunday 25 February 2007 11:42 am, Peter Dimov wrote:
signal.connect(signal_type::slot_type(slot, _2, _1).track(slot));
It's a bit murky whether track(slot) would only cause the tracked objects of slot to get tracked, or also track the slot itself (or its pimpl). I suppose it would depend on whether copies of slots are deep or share the same SlotFunction.
You don't need tracking for the above example; bind( slot, _2, _1 ) stores a copy of slot. Signals currently need tracking because they're noncopyable and are bound using ref(). A copyable signal does not, regardless of the semantics of the copy (deep, shallow, or something in between - deep for the signal, shallow for the contained slots).
But you need to at least copy the list of tracked objects from the slot inside the bind to the slot received by connect(). Or, you would have to use visit each to discover any slots inside the bind and get their tracked object lists. -- Frank