On Tue, 26 Oct 1999, Thomas David Rivers wrote:
> >
> > Does anyone (anyone, that is, who's coded X11 applications) know how you
> > handle X11 callbacks to C++ object methods?
> >
> > Thanks,
>
> If you mean Xt (and possibly Motif) - the answer is "very carefully."
>
> The Xt callbacks are C based, so you typically can't directly call a
> C++ method.
>
> But, you can have an extern "C" block that declares the call back
> function (the extern "C" basically keeps any name mangling from going on)
> and then, in that function, invoke the method as appropriate.
>
> I believe you do something like:
[example deleted]
Then you just stick a C wrapper function around every C++ callback you
want to register, is that it? Seems a bit inelegant, but I suppose, if
the ultimate test of elegance is that "it's the only one that works", then
it's perhaps elegant *enough*.
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Chuck Robey | Interests include C programming, Electronics,
213 Lakeside Dr. Apt. T-1 | communications, and signal processing.
Greenbelt, MD 20770 | I run picnic.mat.net: FreeBSD-current(i386) and
(301) 220-2114 | jaunt.mat.net : FreeBSD-current(Alpha)
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