The problem is that in the second version, your App constructor doesn't create/new an AppImpl and therefore no Fl_Window is created and shown either, so Fl::run() will simply return straight away.

Please note that this github issues page is for discussing identified problems with the FLTK library itself.
To discuss problems in user code, please post your question to the fltk.general mailing list / newsgroup, where you should also mention which version of FLTK you are using, and on which platform, as that might be relevant.

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