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Re: Yet again, The Sky is Falling! [message #53034 is a reply to message #52840]

Mon, 12 March 2007 17:25

JD Smith
Messages: 850
Registered: December 1999

Senior Member

On Fri, 09 Mar 2007 10:25:41 +0100, Paolo Grigis wrote:

> Here's a simple example of a routine that returns different values if it
> is called by value or by reference.
>
> pro pg,a,b
>
> b=arg_present(a)
>
> end
>
>
> IDL> x=1
> IDL> pg,x,b
> IDL> print,b
> 1
>
> IDL> pg,x+0,b
> IDL> print,b
> 0
>
> IDL> pg,x[0],b
> IDL> print,b
> 0

That's a bit of a contrived example, given that the whole reason I
originally lobbied for ARG_PRESENT was so you could differentiate between
by-value and by-reference arguments (which I observed IDL's own internal
routines could do, so clearly it was functionality waiting to be exposed).

JD

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[Message index]

		Re: Yet again, The Sky is Falling! By: Paolo Grigis on Fri, 09 March 2007 01:25
		Re: Yet again, The Sky is Falling! By: R.Bauer on Fri, 09 March 2007 00:31
		Re: Yet again, The Sky is Falling! By: David Fanning on Thu, 08 March 2007 20:52
		Re: Yet again, The Sky is Falling! By: yp on Thu, 08 March 2007 16:21
		Re: Yet again, The Sky is Falling! By: news.qwest.net on Thu, 08 March 2007 15:04
		Re: Yet again, The Sky is Falling! By: yp on Thu, 08 March 2007 14:57
		Re: Yet again, The Sky is Falling! By: news.qwest.net on Thu, 08 March 2007 14:34
		Re: Yet again, The Sky is Falling! By: yp on Thu, 08 March 2007 12:31
		Re: Yet again, The Sky is Falling! By: Paul Van Delst[1] on Thu, 08 March 2007 12:22
		Re: Yet again, The Sky is Falling! By: yp on Thu, 08 March 2007 12:22
		Re: Yet again, The Sky is Falling! By: yp on Thu, 08 March 2007 12:02
		Re: Yet again, The Sky is Falling! By: yp on Thu, 08 March 2007 11:58
		Re: Yet again, The Sky is Falling! By: news.qwest.net on Thu, 08 March 2007 11:30
		Re: Yet again, The Sky is Falling! By: David Fanning on Thu, 08 March 2007 11:27
		Re: Yet again, The Sky is Falling! By: yp on Thu, 08 March 2007 11:18
		Re: Yet again, The Sky is Falling! By: yp on Thu, 08 March 2007 11:11
		Re: Yet again, The Sky is Falling! By: Paul Van Delst[1] on Thu, 08 March 2007 10:27
		Re: Yet again, The Sky is Falling! By: Paul Van Delst[1] on Thu, 08 March 2007 10:24
		Re: Yet again, The Sky is Falling! By: David Fanning on Thu, 08 March 2007 10:22
		Re: Yet again, The Sky is Falling! By: Carsten Lechte on Fri, 09 March 2007 02:06
		Re: Yet again, The Sky is Falling! By: yp on Fri, 09 March 2007 08:38
		Re: Yet again, The Sky is Falling! By: yp on Fri, 09 March 2007 03:26
		Re: Yet again, The Sky is Falling! By: R.Bauer on Fri, 09 March 2007 04:18
		Re: Yet again, The Sky is Falling! By: JD Smith on Mon, 12 March 2007 17:25

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