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Re: CATCH inside a FOR loop and out? [message #88359 is a reply to message #88337]

Wed, 16 April 2014 12:50

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

On Tuesday, April 15, 2014 3:31:19 PM UTC-4, Chris Torrence wrote:
> One important point - "catch" is expensive. It's better to put it outside of the for loop, and just use a "start" index to continue. Something like:

Hey Chris, is there any chance of making IDL exception handling more modern? The C language 'setjmp' exception handling model is not the best. The catch variable is kind of a clunky nuisance, and having to remember to /CANCEL your catch handler is also a bit of a chore.

A revised grammar could be as simple as this,

CATCH BEGIN
;; ... possibly failing code ...
END ELSE BEGIN
;; ... exception handler here ...
ENDELSE

No extra keywords required to be added to the language, no nuisance variables, and cleaner flow. (and no backward compatibility problems) The exception handler can look at any of the crumpteen million !ERR* variables to decide what went wrong.

Craig

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[Message index]

		CATCH inside a FOR loop and out? By: cgguido on Mon, 14 April 2014 12:25
		Re: CATCH inside a FOR loop and out? By: David Fanning on Mon, 14 April 2014 12:30
		Re: CATCH inside a FOR loop and out? By: cgguido on Mon, 14 April 2014 12:30
		Re: CATCH inside a FOR loop and out? By: David Fanning on Mon, 14 April 2014 12:31
		Re: CATCH inside a FOR loop and out? By: chris_torrence@NOSPAM on Tue, 15 April 2014 12:31
		Re: CATCH inside a FOR loop and out? By: cgguido on Tue, 15 April 2014 21:23
		Re: CATCH inside a FOR loop and out? By: Craig Markwardt on Wed, 16 April 2014 12:50
		Re: CATCH inside a FOR loop and out? By: chris_torrence@NOSPAM on Thu, 17 April 2014 10:08
		Re: CATCH inside a FOR loop and out? By: Michael Galloy on Thu, 17 April 2014 13:27
		Re: CATCH inside a FOR loop and out? By: Craig Markwardt on Thu, 17 April 2014 13:56
		Re: CATCH inside a FOR loop and out? By: chris_torrence@NOSPAM on Thu, 17 April 2014 15:06

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