On Fri, Jan 16, 2009 at 9:00 AM, Yigal Chripun <[email protected]> wrote:
> 2. there's more to S&S than just an array of delegates - they are weak refs > so that destruction of an object disconnects automatically the apropriate > signals. but there is a weakref lib for D written by Bill IIRC, that could > be utilized in qtD. no pre-processor needed. The "delegates" in Qt are more like a QObject,QString pair. The object and the *name* of the method to call. And there aren't really "weak refs" in Qt. When you connect a signal and slot it also makes some extra connections between the two objects' destroyed() signals. So each object is also listening for the other object to be destroyed. Sort of a weak ref, but more like a strong ref with active notifications about destruction either way. In a GC'ed language with real weak refs, the slot holder doesn't have to worry if the signal sender disappears. --bb
