[jcc7]

DCouple is an inactive project (dcouple_0.2 is from 2004/09/17), but a new D library seems to be related to this idea.

Yesterday, Lutger Blijdestijn announced that he's released an initial version of his signals slots library at http://lutger.ifastnet.com/.

[veelo]

Yes, this project became inactive due to the problems related to the garbage collector. Existing connections keep objects alive, which is sort of counter the idea of Signals and Slots in a garbage collected language. It helped fed the discussion on "weak pointers" back then.

That problem has been sucessfully addressed by the Signal and Slot implementation in Indigo, http://www.uwesalomon.de/code/indigo/files/core/cmdtarget-d.html#Signals_and_slots , which uses its own memory management for signals and slots.

I still prefer the syntax of dcouple, but if I remember well you can't have both.

I do not know how Lutger's implementation faires with the garbage collector, I only had a quick glance at his documentation.

Bastiaan Veelo

[jcc7]

For people who have been following the D newsgroups recently, this news is a few days old. But it can be hard to keep up with D news, so I'll mention the signals-and-slots news here anyway.

Walter suddenly decided to add some features to D to facilitate his vision for signals-and-slots and added a module called std.signals to Phobos.

So I guess there are at least 3 signals-and-slots projects now.