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Re: Unsupported keyword on older IDL version [message #31649 is a reply to message #31647]

Mon, 29 July 2002 07:40

thompson
Messages: 584
Registered: August 1991

Senior Member

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).

> This to me looks like a somewhat illegitimate use of call_function. Not
> that I mind bending the rules a bit, but are there any other (better)
> techniques of dealing with keywords that don't work in all IDL versions.

Why do you call this "illegitimate"? To me this seems like just the sort of
thing that call_function() was designed for. I've always done it this way in
the past. In fact, I've usually used execute() in the past, but
call_function() is more elegant.

Bill Thompson

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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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