> void MyClass::btn2_cb(Fl_Widget *w, void *data)
> {
> MyClass *p = (MyClass*)data;
> p->btn1_cb(0, data);
> //or even: p->btn1_cb(w, data);
> }
>
> This code seems to work but I'm not sure there's no any hidden risk(s)
> in giving zero or 'w' as first argument.
>
> Can anybody tells me ?
That is an OK thing to do - that fact that "w" in NULL doesn't matter,
as long as you don't try to use it, of course! Your second option (where
you propagate "w" from btn2 to btn1 is possibly more flexible, in that
it would allow that the btn1_cb could use "w" if it needed to.
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