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Re: Unsupported keyword on older IDL version [message #31636 is a reply to message #31633]

Mon, 29 July 2002 13:17

JD Smith
Messages: 850
Registered: December 1999

Senior Member

On Mon, 29 Jul 2002 08:14:12 -0700, Craig Markwardt wrote:

> Paul Hick <pphick@ucsd.edu> writes:
>
>> This kind of problem must have come up in this group before, but here
>> it is anyways.
>>
>> If I call the IDL systime function with the utc keyword:
>> print, systime(/utc)
>>
>> on IDL versions older than 5.4 I get the expected 'keyword not
>> supported' error message, since, well, it's not supported, right? The
>> error message pops up when the function containing the systime call is
>> compiled, so testing e.g. !version.release before executing the systime
>> call doesn't work.
>>
>> The only solution I have come up with so far is to put the systime call
>> inside a call_function call:
>> print, call_function( 'systime', /utc)
>> This will compile (I will still need to test for !version.release
>> before actually executing the statement of course).
>
> Another possibility is to use the _EXTRA mechanism:
>
> ;; Assume EXTRA is undefined
> if double(!version.release) GE 5.4 then $
> extra = {utc: 1}
> value = systime(_EXTRA=extra)
>
> Anyway you cut it, you will need an IDL version check.

Unless you use _STRICT_EXTRA, the inheritance mechanism doesn't care if
you pass it bogus keywords... in fact, that deficiency is what prompted
the creation of _STRICT_EXTRA. Here you can use it to your advantage.

IDL> print,systime(/UTCABC)
% Keyword UTCABC not allowed in call to: SYSTIME % Execution halted at:
$MAIN$
IDL> print,systime(_EXTRA={UTCABC:1})
Mon Jul 29 13:08:09 2002
IDL> print,systime(_STRICT_EXTRA={UTCABC:1}) % Keyword UTCABC not allowed
in call to: SYSTIME % Execution halted at: $MAIN$

Unfortunately, for this case, it doesn't work, because SYSTIME went from
having none to some keywords, so in old versions of IDL (prior to the
introduction of keywords to SYSTIME), you get:

IDL> print,systime(_EXTRA={UTC:1})

print,systime(_EXTRA={UTC:1})
^
% Keyword parameters not allowed in call.

For routines with new keywords, which always had keywords, this should
work.

JD

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[Message index]

		Re: Unsupported keyword on older IDL version By: Paul Hick on Mon, 29 July 2002 20:30
		Re: Unsupported keyword on older IDL version By: David Fanning on Mon, 29 July 2002 20:21
		Re: Unsupported keyword on older IDL version By: Paul Hick on Mon, 29 July 2002 19:41
		Re: Unsupported keyword on older IDL version By: JD Smith on Mon, 29 July 2002 13:17
		Re: Unsupported keyword on older IDL version By: David Fanning on Mon, 29 July 2002 13:35
		Re: Unsupported keyword on older IDL version By: David Fanning on Mon, 29 July 2002 08:34
		Re: Unsupported keyword on older IDL version By: Craig Markwardt on Mon, 29 July 2002 08:14
		Re: Unsupported keyword on older IDL version By: thompson on Mon, 29 July 2002 07:40

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