> > *** glibc detected *** double free or corruption (out):
> 0xbffff080 ***
> > Aborted
> >
> > This is the error when I do the window callback...
> > It is occurring since I have broken down my code into files
> and redeclared the callbacks as extern "C" void function(){}
> in a different file.
>
> That might not be due to that. But the callback didn't seem
> to have any errors.
You have not said what version of fltk you are using, nor what platform
you are running on. Both these things might be helpful.
However, at a guess, my first reaction is there is something wrong in
your code - you are probably freeing (or deleting) something that you
shouldn't, which is then being free'd again by fltk when it terminates.
The fact that you only see this when you shutdown is almost certainly
just a consequence of the fact that occurs when the program terminates -
so probably your window callback is OK, and this is a side-effect of an
error elsewhere in your program that is not exposed until you exit.
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