Qt 4.5 to be LGPL

[Bill Baxter]

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.

--bb