Hi,
I'm wondering if calling a callback from another callback
is a safe thing and what to give exactly as first argument.
Here's an example of kind of things I use to do:
class MyClass : public Fl_Double_Window
{
Fl_Button *btn1, *btn2;
...
public:
MyClass(int w, int h, const char *l, int argc, char *argv[])
: Fl_Double_Window(w, h, l)
{
...
btn1->callback(btn1_cb, this);
btn2->callback(btn2_cb, this);
}
...
static void btn1_cb(Fl_Widget *w, void *data);
static void btn2_cb(Fl_Widget *w, void *data);
};
void MyClass::btn1_cb(Fl_Widget *w, void *data)
{
//some code I'll need in the next callback...
}
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 ?
Thanks
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