Qt 4.5 to be LGPL

[Walter Bright]

Bill Baxter wrote:
> On Fri, Jan 16, 2009 at 9:00 AM, Yigal Chripun <yigal100 at gmail.com> 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.

This is taken care of in std.signals.