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Re: Unsupported keyword on older IDL version [message #31633 is a reply to message #31632]

Mon, 29 July 2002 19:41

Paul Hick
Messages: 9
Registered: November 1999

Junior Member

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.
>
> Craig
>
>

The _extra mechanism is a fairly recent addition to IDL, isn't it? So
that would just move the problem to a different arena.

The systime function is 'special' in the sense that it is a 'built-in'
IDL function (there is no systime.pro file floating around anywhere that
I can see). That suggests another solution. The systime(/utc) call could
be hidden in a separate user-written function systime_for_idl5_4.
Calling this after checking !version.release would also work, since the
user-written routine would never get compiled on pre5.4 versions.

Paul

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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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