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Re: IDLVM and retall [message #50002 is a reply to message #50001]

Thu, 07 September 2006 21:00

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

JD Smith writes:

> Here's a better example:
>
> pro MyClass:f1, ev
> if something_is_wrong self->Error
> do_calc
> end
>
> pro MyClass:f2,ev
> self->f1,ev
> do_another_calc
> end
>
>> Can this be a difference between Windows and UNIX?
>
> If you simply return (or return twice, if you were able to do that
> from within self->Error), you'd be right back inside MyClass:f2 and
> do_another_calc would run, which is not what you want. With RETALL,
> the entire calling stack is returned from, not just one step in the
> stack.

OK, I see what you mean. Yes, when you are trying to
merge widgets and objects things do tend to get a little
messy. I don't find myself buried this deep in my widget
programs, which is why RETURN has always worked for
me. But I do remember some messy, messy code in my
Catalyst Library to keep error messages from propagating
up the whole damn call stack! Essentially, we had to
keep track of whether the error had already been
"handled" or not, and keep issuing RETURNs if it had.
Your solution is probably better looking than this. :-)

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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[Message index]

		Re: IDLVM and retall By: JD Smith on Fri, 08 September 2006 09:35
		Re: IDLVM and retall By: JD Smith on Fri, 08 September 2006 09:30
		Re: IDLVM and retall By: JD Smith on Fri, 08 September 2006 09:26
		Re: IDLVM and retall By: JD Smith on Fri, 08 September 2006 09:12
		Re: IDLVM and retall By: news.qwest.net on Fri, 08 September 2006 09:10
		Re: IDLVM and retall By: btt on Fri, 08 September 2006 09:02
		Re: IDLVM and retall By: news.qwest.net on Fri, 08 September 2006 08:42
		Re: IDLVM and retall By: David Fanning on Fri, 08 September 2006 08:28
		Re: IDLVM and retall By: btt on Fri, 08 September 2006 07:57
		Re: IDLVM and retall By: David Fanning on Thu, 07 September 2006 21:00
		Re: IDLVM and retall By: JD Smith on Thu, 07 September 2006 15:57
		Re: IDLVM and retall By: David Fanning on Thu, 07 September 2006 12:14
		Re: IDLVM and retall By: JD Smith on Thu, 07 September 2006 11:54
		Re: IDLVM and retall By: David Fanning on Thu, 07 September 2006 06:52
		Re: IDLVM and retall By: JD Smith on Thu, 07 September 2006 01:57
		Re: IDLVM and retall By: JD Smith on Wed, 06 September 2006 23:21
		Re: IDLVM and retall By: Foldy Lajos on Wed, 06 September 2006 12:30
		Re: IDLVM and retall By: JD Smith on Wed, 06 September 2006 11:53
		Re: IDLVM and retall By: Foldy Lajos on Tue, 05 September 2006 08:31
		Re: IDLVM and retall By: David Fanning on Fri, 08 September 2006 09:48

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