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devel / comp.lang.mumps / Re: Traps as exceptions

SubjectAuthor
* Traps as exceptionsJens Lideström
+- Re: Traps as exceptionsK.S. Bhaskar
`* Re: Traps as exceptionsed de moel
 `- Re: Traps as exceptionsJens Lideström

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Traps as exceptions

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Subject: Traps as exceptions
From: jens.lidestrom@vgregion.se (Jens Lideström)
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 by: Jens Lideström - Fri, 13 May 2022 07:21 UTC

Hello, mumpstereers

The trap mechanism in Mumps has similarities with the exception mechanism in many other language.

Most examples I have seem of trap usage is for catching unintentional errors.

Is there also a way intentionally trigger an error, which can be caught by a trap, in a way that is similar to throwing an exception?

I am working with GT.M V7.0.

I’m learning about traps from here: http://tinco.pair.com/bhaskar/gtm/doc/books/pg/UNIX_manual/ch13s06.html

This question is cross-posted on Stack Overflow: https://stackoverflow.com/questions/72215952/traps-as-exceptions

Re: Traps as exceptions

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Subject: Re: Traps as exceptions
From: ksbhaskar@gmail.com (K.S. Bhaskar)
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 by: K.S. Bhaskar - Fri, 13 May 2022 11:22 UTC

On Friday, May 13, 2022 at 3:21:11 AM UTC-4, jens.li...@vgregion.se wrote:
> Hello, mumpstereers
>
> The trap mechanism in Mumps has similarities with the exception mechanism in many other language.
>
> Most examples I have seem of trap usage is for catching unintentional errors.
>
> Is there also a way intentionally trigger an error, which can be caught by a trap, in a way that is similar to throwing an exception?
>
> I am working with GT.M V7.0.
>
> I’m learning about traps from here: http://tinco.pair.com/bhaskar/gtm/doc/books/pg/UNIX_manual/ch13s06.html
>
> This question is cross-posted on Stack Overflow: https://stackoverflow.com/questions/72215952/traps-as-exceptions

Jens, does ZMESSAGE (https://docs.yottadb.com/ProgrammersGuide/commands.html#zmessage) help?

Regards
– Bhaskar

Re: Traps as exceptions

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Subject: Re: Traps as exceptions
From: eddemoel@gmail.com (ed de moel)
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 by: ed de moel - Fri, 13 May 2022 11:55 UTC

See also: http://71.174.62.16/Demo/AnnoStd?Frame=Main&Page=a106012&Edition=1995
As an example, you could code:
Set a=1 Set $Ecode=",U123," Set b=2
Setting the value of $ECode triggers an error, and the Set b=2 would never be reached.

Hope this helps,
Ed

Re: Traps as exceptions

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Subject: Re: Traps as exceptions
From: jens.lidestrom@vgregion.se (Jens Lideström)
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 by: Jens Lideström - Fri, 13 May 2022 12:58 UTC

Thanks Ed and Bhaskar!

ZMESSAGE and $Ecode are exactly the mechanisms I was looking for.

I don't understand how I could have missed them in the manual. I will investigate them.

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