Re: Where's the -1 go? (Not another troll question)

On Fri, 05 Aug 2011 15:34:23 +0200, Rothenmaier, Deane C. <[email protected]> wrote:

> Geniuses, Gurus, Wizards, et. al...
>
> I'm working on some Win32::GUI code, with no formal training, and just enough OTJ to be really dangerous.  I've come up against a couple of questions that I cannot find answers to in my books.  Here's the code:
>
> #===============
> sub Exit_Click {
> #===============
>    MainWindow_Terminate();
> }
>
> #=========================
> sub MainWindow_Terminate {
> #=========================
>    print LOG "="x80 . "\n";
>    close( LOG );
>    return( -1 );
> }
>
> And here's the questions:
> First, when Exit_Click (E_C) calls MainWindow_Terminate (MW_T), it does nothing with the -1 that MW_T returns-or at least it looks that way (it is GUI, after all, and I'm learning that GUI does a lot of, um, "invisible" stuff). So where does that -1 go? Into the bit bucket? Or does GUI do some behind-the-curtain prestidigitation with it?  If this wasn't GUI code, I'd feel confident believing that it's just ignored. But it is. So I don't.

Strictly speaking the -1 is returned by Exit_Click, since the result of the last line executed in a sub is always returned by that sub. So if whatever calls E_C does something with its return value, then you cannot assume it's being ignored.

-- 
With regards,
Christian Walde
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