Some quick comments.

You placed a prototype ("($$)") on output (bad) and you use "&" on the call (bad) which means "ignore the prototype". That makes no sense (bad).

Why don't you place output in a module instead of main. You could even import it if you so desired. Actually, it's already been done.

In reply to Re: Mixing procedural and OO code, one file. by ikegami
in thread Mixing procedural and OO code, one file. by DStaal

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