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Re: CASE statement [message #27045 is a reply to message #26552]

Sat, 06 October 2001 03:01

weitkamp
Messages: 33
Registered: October 1998

Member

Paul van Delst <paul.vandelst@noaa.gov> wrote in messagenews:<3BBE2163.F73A162D@noaa.gov>...
> "Pavel A. Romashkin" wrote:
>>
>> Timm Weitkamp wrote:
>>>
>>> It actually also has some counterintuitive features. This one, for
>>> example:
>>>
>>> IDL> PRINT, KEYWORD_SET([0])
>>> 1
>>
>> Correct me if I am wrong, but the PURPOSE of KEYWORD_SET is to check if
>> a KEYWORD is SET. Settable keywords are those that you either set or
>> don't, either /K_SET or K_SET=0. As such, they should not be set to
>> arrays. As far as I can see, Keyword_Set is a convenience function. For
>> value passing keywords, N_elements should be used.
>> So, it looks to me that the name of this function means exactly what it
>> is designed for.
>
> Excellent point.
>
> paulv

Pavel and Paul,

I mostly agree with you. But when you're programming a routine, even
if you do use KEYWORD_SET in the strictly limited context that it
should be, it is still possible that the user of the routine
accidentally passes [0] (or [1]) instead of 0 (or 1) if the keyword is
passed as an expression and not as an explicit value as in Pavel's
example. Of course you may then blame the user, but that is of limited
help.

Timm

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[Message index]

		CASE statement By: K Banerjee on Fri, 07 September 2001 13:17
		Re: CASE statement By: R.Bauer on Wed, 03 October 2001 23:51
		Re: CASE statement By: weitkamp on Fri, 05 October 2001 11:44
		Re: CASE statement By: David Fanning on Wed, 03 October 2001 12:02
		Re: CASE statement By: george.mccabe on Fri, 05 October 2001 09:25
		Re: CASE statement By: David Fanning on Mon, 08 October 2001 09:55
		Re: CASE statement By: John-David T. Smith on Mon, 08 October 2001 09:27
		Re: CASE statement By: R.Bauer on Mon, 08 October 2001 00:19
		Re: CASE statement By: weitkamp on Sat, 06 October 2001 03:01
		Re: CASE statement By: Paul van Delst on Fri, 05 October 2001 14:08
		Re: CASE statement By: Pavel A. Romashkin on Fri, 05 October 2001 12:03

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