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Re: IDLVM and retall [message #50001 is a reply to message #50000]

Fri, 08 September 2006 07:57

btt
Messages: 345
Registered: December 2000

Senior Member

David Fanning wrote:
> 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. :-)

Hi,

At risk of exposing my arrested development, I harken back to exchange I
witnessed between David and Martin Schultz eons ago. I can't remember
if it was on the newsgroup or "off-line". But I do remember clearly
that Martin and David leaned toward a FUNCTION event handling method
rather than a PROcedure - the function event handling method returned
0/1 for fail/success. If I remember rightly, the decision was driven by
the messaging aspect of events (or pseudo-events) and that functions, if
nothing else, pass messages by default.

Would that suffice to resolve the issue?

function MyClass::f1, ev
if something_is_wrong then begin
self->Error
return,0
endif
return,do_calc()
end
function MyClass::f2,ev
OK = self->f1(ev)
if OK then OK = do_another_calc()
return, OK
end

Of course, it was a long time back and I had hair and a shorter
attention span. I still have the same attention span - but the hair has
gone AWOL.

Cheers,
Ben

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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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