* [Caml-list] wrapper for C++ class never gets garbage collected
@ 2016-03-07 20:31 Goswin von Brederlow
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From: Goswin von Brederlow @ 2016-03-07 20:31 UTC (permalink / raw)
To: Ocaml Mailing List
Hi,
I've run into a snag writing bindings for Qt5 widgets. The problem is
that GUI elements are never garbage collected.
Here is why:
The Qt5 object needs a pointer to the coresponding ocaml class so it
can deliver events that are generated by Qt5 to the ocaml side. It
therefore must have a "value ml_obj;". Because the GC can move the
ocaml object around that value must be registered as root with the GC.
The ocaml class then can never be garbage collected. And if it is not
garbage collected then it will no free the Qt5 object.
It seems to me that this should be a common problem for any bindings
that include callbacks from C to ocaml. Is everyone using an extra
indirection through a Weak array? Or manual memory management?
Shouldn't there be a way to register a value with the GC as weak?
MfG
Goswin
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